2011-12-19 Basile Starynkevitch <basile@starynkevitch.net>

	MELT branch merged with trunk rev 182471 using svnmerge



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/melt-branch@182472 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 2158 insertions, 0 deletions

diff --git a/gcc/ada/s-tasdeb-vms.adb b/gcc/ada/s-tasdeb-vms.adb
new file mode 100644
index 00000000000..d0cb60f9687
--- /dev/null
+++ b/gcc/ada/s-tasdeb-vms.adb
@@ -0,0 +1,2158 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                  GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                --
+--                                                                          --
+--                  S Y S T E M . T A S K I N G . D E B U G                 --
+--                                                                          --
+--                                  B o d y                                 --
+--                                                                          --
+--          Copyright (C) 2008-2010, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- GNARL was developed by the GNARL team at Florida State University.       --
+-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  OpenVMS Version
+
+with Ada.Unchecked_Conversion;
+with Ada.Unchecked_Deallocation;
+with System.Aux_DEC;
+with System.CRTL;
+with System.Task_Primitives.Operations;
+package body System.Tasking.Debug is
+
+   package OSI renames System.OS_Interface;
+   package STPO renames System.Task_Primitives.Operations;
+
+   use System.Aux_DEC;
+
+   --  Condition value type
+
+   subtype Cond_Value_Type is Unsigned_Longword;
+
+   type Trace_Flag_Set is array (Character) of Boolean;
+
+   Trace_On : Trace_Flag_Set := ('A' .. 'Z' => False, others => True);
+
+   --  Print_Routine fuction codes
+
+   type Print_Functions is
+     (No_Print, Print_Newline, Print_Control,
+      Print_String, Print_Symbol, Print_FAO);
+   for Print_Functions use
+     (No_Print => 0, Print_Newline => 1, Print_Control => 2,
+      Print_String => 3, Print_Symbol => 4, Print_FAO => 5);
+
+   --  Counted ascii type declarations
+
+   subtype Count_Type is Natural range 0 .. 255;
+   for Count_Type'Object_Size use 8;
+
+   type ASCIC (Count : Count_Type) is record
+      Text  : String (1 .. Count);
+   end record;
+
+   for ASCIC use record
+      Count at 0 range 0 .. 7;
+   end record;
+   pragma Pack (ASCIC);
+
+   type AASCIC is access ASCIC;
+   for AASCIC'Size use 32;
+
+   type AASCIC_Array is array (Positive range <>) of AASCIC;
+
+   type ASCIC127 is record
+      Count : Count_Type;
+      Text  : String (1 .. 127);
+   end record;
+
+   for ASCIC127 use record
+      Count at 0 range 0 .. 7;
+      Text  at 1 range 0 .. 127 * 8 - 1;
+   end record;
+
+   --  DEBUG Event record types used to signal DEBUG about Ada events
+
+   type Debug_Event_Record is record
+      Code     : Unsigned_Word; --  Event code that uniquely identifies event
+      Flags    : Bit_Array_8;   --  Flag bits
+      --                            Bit 0: This event allows a parameter list
+      --                            Bit 1: Parameters are address expressions
+      Sentinal : Unsigned_Byte; --  Sentinal valuye: Always K_EVENT_SENT
+      TS_Kind  : Unsigned_Byte; --  DST type specification: Always K_TS_TASK
+      DType    : Unsigned_Byte; --  DTYPE of parameter if of atomic data type
+      --                            Always K_DTYPE_TASK
+      MBZ      : Unsigned_Byte; --  Unused (must be zero)
+      Minchr   : Count_Type;    --  Minimum chars needed to identify event
+      Name     : ASCIC (31);    --  Event name uppercase only
+      Help     : AASCIC;        --  Event description
+   end record;
+
+   for Debug_Event_Record use record
+      Code     at 0 range 0 .. 15;
+      Flags    at 2 range 0 .. 7;
+      Sentinal at 3 range 0 .. 7;
+      TS_Kind  at 4 range 0 .. 7;
+      Dtype    at 5 range 0 .. 7;
+      MBZ      at 6 range 0 .. 7;
+      Minchr   at 7 range 0 .. 7;
+      Name     at 8 range 0 .. 32 * 8 - 1;
+      Help     at 40 range 0 .. 31;
+   end record;
+
+   type Ada_Event_Control_Block_Type is record
+      Code      : Unsigned_Word;     --  Reserved and defined by DEBUG
+      Unused1   : Unsigned_Byte;     --  Reserved and defined by DEBUG
+      Sentinal  : Unsigned_Byte;     --  Reserved and defined by DEBUG
+      Facility  : Unsigned_Word;     --  Reserved and defined by DEBUG
+      Flags     : Unsigned_Word;     --  Reserved and defined by DEBUG
+      Value     : Unsigned_Longword; --  Reserved and defined by DEBUG
+      Unused2   : Unsigned_Longword; --  Reserved and defined by DEBUG
+      Sigargs   : Unsigned_Longword;
+      P1        : Unsigned_Longword;
+      Sub_Event : Unsigned_Longword;
+   end record;
+
+   for Ada_Event_Control_Block_Type use record
+      Code      at 0 range 0 .. 15;
+      Unused1   at 2 range 0 .. 7;
+      Sentinal  at 3 range 0 .. 7;
+      Facility  at 4 range 0 .. 15;
+      Flags     at 6 range 0 .. 15;
+      Value     at 8 range 0 .. 31;
+      Unused2   at 12 range 0 .. 31;
+      Sigargs   at 16 range 0 .. 31;
+      P1        at 20 range 0 .. 31;
+      Sub_Event at 24 range 0 .. 31;
+   end record;
+
+   type Ada_Event_Control_Block_Access is access Ada_Event_Control_Block_Type;
+   for Ada_Event_Control_Block_Access'Size use 32;
+
+   --  Print_Routine_Type with max optional parameters
+
+   type Print_Routine_Type is access procedure
+     (Print_Function    : Print_Functions;
+      Print_Subfunction : Print_Functions;
+      P1                : Unsigned_Longword := 0;
+      P2                : Unsigned_Longword := 0;
+      P3                : Unsigned_Longword := 0;
+      P4                : Unsigned_Longword := 0;
+      P5                : Unsigned_Longword := 0;
+      P6                : Unsigned_Longword := 0);
+   for Print_Routine_Type'Size use 32;
+
+   ---------------
+   -- Constants --
+   ---------------
+
+   --  These are used to obtain and convert task values
+   K_CVT_VALUE_NUM  : constant := 1;
+   K_CVT_NUM_VALUE  : constant := 2;
+   K_NEXT_TASK      : constant := 3;
+
+   --  These are used to ask ADA to display task information
+   K_SHOW_TASK     : constant := 4;
+   K_SHOW_STAT     : constant := 5;
+   K_SHOW_DEADLOCK : constant := 6;
+
+   --  These are used to get and set various attributes of one or more tasks
+   --    Task state
+   --  K_GET_STATE  : constant := 7;
+   --  K_GET_ACTIVE : constant := 8;
+   --  K_SET_ACTIVE : constant := 9;
+   K_SET_ABORT  : constant := 10;
+   --  K_SET_HOLD   : constant := 11;
+
+   --    Task priority
+   K_GET_PRIORITY      : constant := 12;
+   K_SET_PRIORITY      : constant := 13;
+   K_RESTORE_PRIORITY  : constant := 14;
+
+   --    Task registers
+   --  K_GET_REGISTERS     : constant := 15;
+   --  K_SET_REGISTERS     : constant := 16;
+
+   --  These are used to control definable events
+   K_ENABLE_EVENT   : constant := 17;
+   K_DISABLE_EVENT  : constant := 18;
+   K_ANNOUNCE_EVENT : constant := 19;
+
+   --  These are used to control time-slicing.
+   --  K_SHOW_TIME_SLICE : constant := 20;
+   --  K_SET_TIME_SLICE  : constant := 21;
+
+   --  This is used to symbolize task stack addresses.
+   --  K_SYMBOLIZE_ADDRESS : constant := 22;
+
+   K_GET_CALLER : constant := 23;
+   --  This is used to obtain the task value of the caller task
+
+   --  Miscellaneous functions - see below for details
+
+   K_CLEANUP_EVENT  : constant := 24;
+   K_SHOW_EVENT_DEF : constant := 25;
+   --  K_CHECK_TASK_STACK : constant := 26;  --  why commented out ???
+
+   --  This is used to obtain the DBGEXT-interface revision level
+   --  K_GET_DBGEXT_REV : constant := 27; -- why commented out ???
+
+   K_GET_STATE_1 : constant := 28;
+   --  This is used to obtain additional state info, primarily for PCA
+
+   K_FIND_EVENT_BY_CODE : constant := 29;
+   K_FIND_EVENT_BY_NAME : constant := 30;
+   --  These are used to search for user-defined event entries
+
+   --  This is used to stop task schedulding. Why commented out ???
+   --  K_STOP_ALL_OTHER_TASKS : constant := 31;
+
+   --  Debug event constants
+
+   K_TASK_NOT_EXIST  : constant := 3;
+   K_SUCCESS         : constant := 1;
+   K_EVENT_SENT      : constant := 16#9A#;
+   K_TS_TASK         : constant := 18;
+   K_DTYPE_TASK      : constant := 44;
+
+   --  Status signal constants
+
+   SS_BADPARAM       : constant := 20;
+   SS_NORMAL         : constant := 1;
+
+   --  Miscellaneous mask constants
+
+   V_EVNT_ALL        : constant := 0;
+   V_Full_Display    : constant := 11;
+   V_Suppress_Header : constant := 13;
+
+   --  CMA constants (why are some commented out???)
+
+   CMA_C_DEBGET_GUARDSIZE     : constant := 1;
+   CMA_C_DEBGET_IS_HELD       : constant := 2;
+--   CMA_C_DEBGET_IS_INITIAL    : constant := 3;
+--   CMA_C_DEBGET_NUMBER        : constant := 4;
+   CMA_C_DEBGET_STACKPTR      : constant := 5;
+   CMA_C_DEBGET_STACK_BASE    : constant := 6;
+   CMA_C_DEBGET_STACK_TOP     : constant := 7;
+   CMA_C_DEBGET_SCHED_STATE   : constant := 8;
+   CMA_C_DEBGET_YELLOWSIZE    : constant := 9;
+--   CMA_C_DEBGET_BASE_PRIO     : constant := 10;
+--   CMA_C_DEBGET_REGS          : constant := 11;
+--   CMA_C_DEBGET_ALT_PENDING   : constant := 12;
+--   CMA_C_DEBGET_ALT_A_ENABLE  : constant := 13;
+--   CMA_C_DEBGET_ALT_G_ENABLE  : constant := 14;
+--   CMA_C_DEBGET_SUBSTATE      : constant := 15;
+--   CMA_C_DEBGET_OBJECT_ADDR   : constant := 16;
+--   CMA_C_DEBGET_THKIND        : constant := 17;
+--   CMA_C_DEBGET_DETACHED      : constant := 18;
+   CMA_C_DEBGET_TCB_SIZE      : constant := 19;
+--   CMA_C_DEBGET_START_PC      : constant := 20;
+--   CMA_C_DEBGET_NEXT_PC       : constant := 22;
+--   CMA_C_DEBGET_POLICY        : constant := 23;
+--   CMA_C_DEBGET_STACK_YELLOW  : constant := 24;
+--   CMA_C_DEBGET_STACK_DEFAULT : constant := 25;
+
+   --  Miscellaneous counted ascii constants
+
+   Star     : constant AASCIC := new ASCIC'(2, ("* "));
+   NoStar   : constant AASCIC := new ASCIC'(2, ("  "));
+   Hold     : constant AASCIC := new ASCIC'(4, ("HOLD"));
+   NoHold   : constant AASCIC := new ASCIC'(4, ("    "));
+   Header   : constant AASCIC := new ASCIC '
+     (60, ("  task id     pri hold state   substate          task object"));
+   Empty_Text : constant AASCIC := new ASCIC (0);
+
+   --  DEBUG Ada tasking states equated to their GNAT tasking equivalents
+
+   Ada_State_Invalid_State     : constant AASCIC :=
+     new ASCIC'(17, "Invalid state    ");
+--   Ada_State_Abnormal          : constant AASCIC :=
+--     new ASCIC'(17, "Abnormal         ");
+   Ada_State_Aborting          : constant AASCIC :=
+     new ASCIC'(17, "Aborting         "); --  Aborting (new)
+--   Ada_State_Completed_Abn     : constant AASCIC :=
+--     new ASCIC'(17, "Completed  [abn] ");
+--   Ada_State_Completed_Exc     : constant AASCIC :=
+--     new ASCIC'(17, "Completed  [exc] ");
+   Ada_State_Completed         : constant AASCIC :=
+     new ASCIC'(17, "Completed        "); --  Master_Completion_Sleep
+   Ada_State_Runnable          : constant AASCIC :=
+     new ASCIC'(17, "Runnable         "); --  Runnable
+   Ada_State_Activating        : constant AASCIC :=
+     new ASCIC'(17, "Activating       ");
+   Ada_State_Accept            : constant AASCIC :=
+     new ASCIC'(17, "Accept           "); --  Acceptor_Sleep
+   Ada_State_Select_or_Delay   : constant AASCIC :=
+     new ASCIC'(17, "Select or delay  "); --  Acceptor_Delay_Sleep
+   Ada_State_Select_or_Term    : constant AASCIC :=
+     new ASCIC'(17, "Select or term.  "); -- Terminate_Alternative
+   Ada_State_Select_or_Abort   : constant AASCIC :=
+     new ASCIC'(17, "Select or abort  "); --  Async_Select_Sleep (new)
+--   Ada_State_Select            : constant AASCIC :=
+--     new ASCIC'(17, "Select           ");
+   Ada_State_Activating_Tasks  : constant AASCIC :=
+     new ASCIC'(17, "Activating tasks "); --  Activator_Sleep
+   Ada_State_Delay             : constant AASCIC :=
+     new ASCIC'(17, "Delay            "); --  AST_Pending
+--   Ada_State_Dependents        : constant AASCIC :=
+--     new ASCIC'(17, "Dependents       ");
+   Ada_State_Entry_Call        : constant AASCIC :=
+     new ASCIC'(17, "Entry call       "); --  Entry_Caller_Sleep
+   Ada_State_Cond_Entry_Call   : constant AASCIC :=
+     new ASCIC'(17, "Cond. entry call "); --  Call.Mode.Conditional_Call
+   Ada_State_Timed_Entry_Call  : constant AASCIC :=
+     new ASCIC'(17, "Timed entry call "); --  Call.Mode.Timed_Call
+   Ada_State_Async_Entry_Call  : constant AASCIC :=
+     new ASCIC'(17, "Async entry call "); --  Call.Mode.Asynchronous_Call (new)
+--   Ada_State_Dependents_Exc    : constant AASCIC :=
+--     new ASCIC'(17, "Dependents [exc] ");
+   Ada_State_IO_or_AST         : constant AASCIC :=
+     new ASCIC'(17, "I/O or AST       "); --  AST_Server_Sleep
+--   Ada_State_Shared_Resource   : constant AASCIC :=
+--     new ASCIC'(17, "Shared resource  ");
+   Ada_State_Not_Yet_Activated : constant AASCIC :=
+     new ASCIC'(17, "Not yet activated"); --  Unactivated
+--   Ada_State_Terminated_Abn    : constant AASCIC :=
+--     new ASCIC'(17, "Terminated [abn] ");
+--   Ada_State_Terminated_Exc    : constant AASCIC :=
+--     new ASCIC'(17, "Terminated [exc] ");
+   Ada_State_Terminated        : constant AASCIC :=
+     new ASCIC'(17, "Terminated       "); --  Terminated
+   Ada_State_Server            : constant AASCIC :=
+     new ASCIC'(17, "Server           "); --  Servers
+   Ada_State_Async_Hold        : constant AASCIC :=
+     new ASCIC'(17, "Async_Hold       "); --  Async_Hold
+
+   --  Task state counted ascii constants
+
+   Debug_State_Emp : constant AASCIC := new ASCIC'(5, "     ");
+   Debug_State_Run : constant AASCIC := new ASCIC'(5, "RUN  ");
+   Debug_State_Rea : constant AASCIC := new ASCIC'(5, "READY");
+   Debug_State_Sus : constant AASCIC := new ASCIC'(5, "SUSP ");
+   Debug_State_Ter : constant AASCIC := new ASCIC'(5, "TERM ");
+
+   --  Priority order of event display
+
+   Global_Event_Display_Order : constant array (Event_Kind_Type)
+     of Event_Kind_Type := (
+      Debug_Event_Abort_Terminated,
+      Debug_Event_Activating,
+      Debug_Event_Dependents_Exception,
+      Debug_Event_Exception_Terminated,
+      Debug_Event_Handled,
+      Debug_Event_Handled_Others,
+      Debug_Event_Preempted,
+      Debug_Event_Rendezvous_Exception,
+      Debug_Event_Run,
+      Debug_Event_Suspended,
+      Debug_Event_Terminated);
+
+   --  Constant array defining all debug events
+
+   Event_Directory : constant array (Event_Kind_Type)
+     of Debug_Event_Record := (
+      (Debug_Event_Activating,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       2,
+       (31, "ACTIVATING                     "),
+       new ASCIC'(41, "!_a task is about to begin its activation")),
+
+      (Debug_Event_Run,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       2,
+       (31, "RUN                            "),
+       new ASCIC'(24, "!_a task is about to run")),
+
+      (Debug_Event_Suspended,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       1,
+       (31, "SUSPENDED                      "),
+       new ASCIC'(33, "!_a task is about to be suspended")),
+
+      (Debug_Event_Preempted,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       1,
+       (31, "PREEMPTED                      "),
+       new ASCIC'(33, "!_a task is about to be preempted")),
+
+      (Debug_Event_Terminated,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       1,
+       (31, "TERMINATED                     "),
+       new ASCIC'(57,
+        "!_a task is terminating (including by abort or exception)")),
+
+      (Debug_Event_Abort_Terminated,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       2,
+       (31, "ABORT_TERMINATED               "),
+       new ASCIC'(40, "!_a task is terminating because of abort")),
+
+      (Debug_Event_Exception_Terminated,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       1,
+       (31, "EXCEPTION_TERMINATED           "),
+       new ASCIC'(47, "!_a task is terminating because of an exception")),
+
+      (Debug_Event_Rendezvous_Exception,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       3,
+       (31, "RENDEZVOUS_EXCEPTION           "),
+       new ASCIC'(49, "!_an exception is propagating out of a rendezvous")),
+
+      (Debug_Event_Handled,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       1,
+       (31, "HANDLED                        "),
+       new ASCIC'(37, "!_an exception is about to be handled")),
+
+      (Debug_Event_Dependents_Exception,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       1,
+       (31, "DEPENDENTS_EXCEPTION           "),
+       new ASCIC'(64,
+        "!_an exception is about to cause a task to await dependent tasks")),
+
+      (Debug_Event_Handled_Others,
+       (False, False, False, False, False, False, False, True),
+       K_EVENT_SENT,
+       K_TS_TASK,
+       K_DTYPE_TASK,
+       0,
+       1,
+       (31, "HANDLED_OTHERS                 "),
+       new ASCIC'(58,
+        "!_an exception is about to be handled in an OTHERS handler")));
+
+   --  Help on events displayed in DEBUG
+
+   Event_Def_Help : constant AASCIC_Array := (
+     new ASCIC'(0,  ""),
+     new ASCIC'(65,
+      "  The general forms of commands to set a breakpoint or tracepoint"),
+     new ASCIC'(22, "  on an Ada event are:"),
+     new ASCIC'(73, "    SET BREAK/EVENT=event [task[, ... ]] " &
+                    "[WHEN(expr)] [DO(comnd[; ... ])]"),
+     new ASCIC'(73, "    SET TRACE/EVENT=event [task[, ... ]] " &
+                    "[WHEN(expr)] [DO(comnd[; ... ])]"),
+     new ASCIC'(0,  ""),
+     new ASCIC'(65,
+      "  If tasks are specified, the breakpoint will trigger only if the"),
+     new ASCIC'(40, "  event occurs for those specific tasks."),
+     new ASCIC'(0,  ""),
+     new ASCIC'(39, "  Ada event names and their definitions"),
+     new ASCIC'(0,  ""));
+
+   -----------------------
+   -- Package Variables --
+   -----------------------
+
+   AC_Buffer : ASCIC127;
+
+   Events_Enabled_Count : Integer := 0;
+
+   Print_Routine_Bufsiz : constant := 132;
+   Print_Routine_Bufcnt : Integer := 0;
+   Print_Routine_Linbuf : String (1 .. Print_Routine_Bufsiz);
+
+   Global_Task_Debug_Events : Debug_Event_Array :=
+     (False, False, False, False, False, False, False, False,
+      False, False, False, False, False, False, False, False);
+   --  Global table of task debug events set by the debugger
+
+   --------------------------
+   -- Exported Subprograms --
+   --------------------------
+
+   procedure Default_Print_Routine
+     (Print_Function    : Print_Functions;
+      Print_Subfunction : Print_Functions;
+      P1                : Unsigned_Longword := 0;
+      P2                : Unsigned_Longword := 0;
+      P3                : Unsigned_Longword := 0;
+      P4                : Unsigned_Longword := 0;
+      P5                : Unsigned_Longword := 0;
+      P6                : Unsigned_Longword := 0);
+   --  The default print routine if not overridden.
+   --  Print_Function determines option argument formatting.
+   --  Print_Subfunction buffers output if No_Print, calls Put_Output if
+   --  Print_Newline
+
+   pragma Export_Procedure
+     (Default_Print_Routine,
+      Mechanism => (Value, Value, Reference, Reference, Reference));
+
+   --------------------------
+   -- Imported Subprograms --
+   --------------------------
+
+   procedure Debug_Get
+     (Thread_Id : OSI.Thread_Id;
+      Item_Req  : Unsigned_Word;
+      Out_Buff  : System.Address;
+      Buff_Siz  : Unsigned_Word);
+
+   procedure Debug_Get
+     (Thread_Id : OSI.Thread_Id;
+      Item_Req  : Unsigned_Word;
+      Out_Buff  : Unsigned_Longword;
+      Buff_Siz  : Unsigned_Word);
+   pragma Interface (External, Debug_Get);
+
+   pragma Import_Procedure (Debug_Get, "CMA$DEBUG_GET",
+     (OSI.Thread_Id, Unsigned_Word, System.Address, Unsigned_Word),
+     (Reference, Value, Reference, Value));
+
+   pragma Import_Procedure (Debug_Get, "CMA$DEBUG_GET",
+     (OSI.Thread_Id, Unsigned_Word, Unsigned_Longword, Unsigned_Word),
+     (Reference, Value, Reference, Value));
+
+   procedure FAOL
+     (Status : out Cond_Value_Type;
+      Ctrstr : String;
+      Outlen : out Unsigned_Word;
+      Outbuf : out String;
+      Prmlst : Unsigned_Longword_Array);
+   pragma Interface (External, FAOL);
+
+   pragma Import_Valued_Procedure (FAOL, "SYS$FAOL",
+     (Cond_Value_Type, String, Unsigned_Word, String, Unsigned_Longword_Array),
+     (Value, Descriptor (S), Reference, Descriptor (S), Reference));
+
+   procedure Put_Output (
+     Status         : out Cond_Value_Type;
+     Message_String : String);
+
+   procedure Put_Output (Message_String : String);
+   pragma Interface (External, Put_Output);
+
+   pragma Import_Valued_Procedure (Put_Output, "LIB$PUT_OUTPUT",
+     (Cond_Value_Type, String),
+     (Value, Short_Descriptor (S)));
+
+   pragma Import_Procedure (Put_Output, "LIB$PUT_OUTPUT",
+     (String),
+     (Short_Descriptor (S)));
+
+   procedure Signal
+     (Condition_Value     : Cond_Value_Type;
+      Number_Of_Arguments : Integer := Integer'Null_Parameter;
+      FAO_Argument_1      : Unsigned_Longword :=
+                              Unsigned_Longword'Null_Parameter);
+   pragma Interface (External, Signal);
+
+   pragma Import_Procedure (Signal, "LIB$SIGNAL",
+      (Cond_Value_Type, Integer, Unsigned_Longword),
+      (Value, Value, Value),
+       Number_Of_Arguments);
+
+   ----------------------------
+   -- Generic Instantiations --
+   ----------------------------
+
+   function Fetch is new Fetch_From_Address (Unsigned_Longword);
+   pragma Unreferenced (Fetch);
+
+   procedure Free is new Ada.Unchecked_Deallocation
+     (Object => Ada_Event_Control_Block_Type,
+      Name   => Ada_Event_Control_Block_Access);
+
+   function To_AASCIC is new
+     Ada.Unchecked_Conversion (Unsigned_Longword, AASCIC);
+
+   function To_Addr is new
+     Ada.Unchecked_Conversion (Task_Procedure_Access, Address);
+   pragma Unreferenced (To_Addr);
+
+   function To_EVCB is new
+     Ada.Unchecked_Conversion
+      (Unsigned_Longword, Ada_Event_Control_Block_Access);
+
+   function To_Integer is new
+     Ada.Unchecked_Conversion (Task_Id, System.Task_Primitives.Task_Address);
+
+   function To_Print_Routine_Type is new
+     Ada.Unchecked_Conversion (Short_Address, Print_Routine_Type);
+
+   --  Optional argumements passed to Print_Routine have to be
+   --  Unsigned_Longwords so define the required Unchecked_Conversions
+
+   function To_UL is new
+     Ada.Unchecked_Conversion (AASCIC, Unsigned_Longword);
+
+   function To_UL is new
+     Ada.Unchecked_Conversion (Integer, Unsigned_Longword);
+
+   function To_UL is new
+     Ada.Unchecked_Conversion (Task_Id, Unsigned_Longword);
+
+   pragma Warnings (Off); --  Different sizes
+   function To_UL is new
+     Ada.Unchecked_Conversion (Task_Entry_Index, Unsigned_Longword);
+   pragma Warnings (On);
+
+   function To_UL is new
+     Ada.Unchecked_Conversion (Short_Address, Unsigned_Longword);
+
+   function To_UL is new
+     Ada.Unchecked_Conversion
+      (Ada_Event_Control_Block_Access, Unsigned_Longword);
+
+   -----------------------
+   -- Local Subprograms --
+   -----------------------
+
+   subtype Function_Codes is System.Aux_DEC.Unsigned_Word range 1 .. 31;
+   --  The 31 function codes sent by the debugger needed to implement
+   --  tasking support, enumerated below.
+
+   type Register_Array is array (Natural range 0 .. 16) of
+     System.Aux_DEC.Unsigned_Longword;
+   --  The register array is a holdover from VAX and not used
+   --  on Alpha or I64 but is kept as a filler below.
+
+   type DBGEXT_Control_Block (Function_Code : Function_Codes) is record
+      Facility_ID         : System.Aux_DEC.Unsigned_Word;
+      --  For GNAT use the "Ada" facility ID
+      Status              : System.Aux_DEC.Unsigned_Longword;
+      --  Successful or otherwise returned status
+      Flags               : System.Aux_DEC.Bit_Array_32;
+      --   Used to flag event as global
+      Print_Routine       : System.Aux_DEC.Short_Address;
+      --  The print subprogram the caller wants to use for output
+      Event_Code_or_EVCB  : System.Aux_DEC.Unsigned_Longword;
+      --  Dual use Event Code or EVent Control Block
+      Event_Value_or_Name : System.Aux_DEC.Unsigned_Longword;
+      --  Dual use Event Value or Event Name string pointer
+      Event_Entry         : System.Aux_DEC.Unsigned_Longword;
+      Task_Value          : Task_Id;
+      Task_Number         : Integer;
+      Ada_Flags           : System.Aux_DEC.Bit_Array_32;
+      Priority            : System.Aux_DEC.Bit_Array_32;
+      Active_Registers    : System.Aux_DEC.Short_Address;
+
+      case Function_Code is
+         when K_GET_STATE_1 =>
+            Base_Priority       : System.Aux_DEC.Bit_Array_32;
+            Task_Type_Name      : System.Aux_DEC.Short_Address;
+            Creation_PC         : System.Aux_DEC.Short_Address;
+            Parent_Task_ID      : Task_Id;
+
+         when others =>
+            Ignored_Unused      : Register_Array;
+
+      end case;
+   end record;
+
+   for DBGEXT_Control_Block use record
+      Function_Code       at 0  range 0 .. 15;
+      Facility_ID         at 2  range 0 .. 15;
+      Status              at 4  range 0 .. 31;
+      Flags               at 8  range 0 .. 31;
+      Print_Routine       at 12 range 0 .. 31;
+      Event_Code_or_EVCB  at 16 range 0 .. 31;
+      Event_Value_or_Name at 20 range 0 .. 31;
+      Event_Entry         at 24 range 0 .. 31;
+      Task_Value          at 28 range 0 .. 31;
+      Task_Number         at 32 range 0 .. 31;
+      Ada_Flags           at 36 range 0 .. 31;
+      Priority            at 40 range 0 .. 31;
+      Active_Registers    at 44 range 0 .. 31;
+      Ignored_Unused      at 48 range 0 .. 17 * 32 - 1;
+      Base_Priority       at 48 range 0 .. 31;
+      Task_Type_Name      at 52 range 0 .. 31;
+      Creation_PC         at 56 range 0 .. 31;
+      Parent_Task_ID      at 60 range 0 .. 31;
+   end record;
+
+   type DBGEXT_Control_Block_Access is access all DBGEXT_Control_Block;
+
+   function DBGEXT (Control_Block : DBGEXT_Control_Block_Access)
+     return System.Aux_DEC.Unsigned_Word;
+   --  Exported to s-taprop.adb to avoid having a VMS specific s-tasdeb.ads
+   pragma Convention (C, DBGEXT);
+   pragma Export_Function (DBGEXT, "GNAT$DBGEXT");
+   --  This routine is called by CMA when VMS DEBUG wants the Gnat RTL
+   --  to give it some assistance (primarily when tasks are debugged).
+   --
+   --  The single parameter is an "external control block". On input to
+   --  the Gnat RTL this control block determines the debugging function
+   --  to be performed, and supplies parameters.  This routine cases on
+   --  the function code, and calls the appropriate Gnat RTL routine,
+   --  which returns values by modifying the external control block.
+
+   procedure Announce_Event
+      (Event_EVCB    : Unsigned_Longword;
+       Print_Routine : Print_Routine_Type := Default_Print_Routine'Access);
+   --  Announce the occurence of a DEBUG tasking event
+
+   procedure Cleanup_Event (Event_EVCB : Unsigned_Longword);
+   --  After DEBUG has processed an event that has signalled, the signaller
+   --  must cleanup. Cleanup consists of freeing the event control block.
+
+   procedure Disable_Event
+      (Flags       : Bit_Array_32;
+       Event_Value : Unsigned_Longword;
+       Event_Code  : Unsigned_Longword;
+       Status      : out Cond_Value_Type);
+   --  Disable a DEBUG tasking event
+
+   function DoAC (S : String) return Address;
+   --  Convert a string to the address of an internal buffer containing
+   --  the counted ASCII.
+
+   procedure Enable_Event
+      (Flags       : Bit_Array_32;
+       Event_Value : Unsigned_Longword;
+       Event_Code  : Unsigned_Longword;
+       Status      : out Cond_Value_Type);
+   --  Enable a requested DEBUG tasking event
+
+   procedure Find_Event_By_Code
+      (Event_Code  : Unsigned_Longword;
+       Event_Entry : out Unsigned_Longword;
+       Status      : out Cond_Value_Type);
+   --  Convert an event code to the address of the event entry
+
+   procedure Find_Event_By_Name
+      (Event_Name  : Unsigned_Longword;
+       Event_Entry : out Unsigned_Longword;
+       Status      : out Cond_Value_Type);
+   --  Find an event entry given the event name
+
+   procedure List_Entry_Waiters
+     (Task_Value      : Task_Id;
+      Full_Display    : Boolean := False;
+      Suppress_Header : Boolean := False;
+      Print_Routine   : Print_Routine_Type := Default_Print_Routine'Access);
+   --  List information about tasks waiting on an entry
+
+   procedure Put (S : String);
+   --  Display S on standard output
+
+   procedure Put_Line (S : String := "");
+   --  Display S on standard output with an additional line terminator
+
+   procedure Show_Event
+      (Print_Routine : Print_Routine_Type := Default_Print_Routine'Access);
+   --  Show what events are available
+
+   procedure Show_One_Task
+     (Task_Value      : Task_Id;
+      Full_Display    : Boolean := False;
+      Suppress_Header : Boolean := False;
+      Print_Routine   : Print_Routine_Type := Default_Print_Routine'Access);
+   --  Display information about one task
+
+   procedure Show_Rendezvous
+     (Task_Value      : Task_Id;
+      Ada_State       : AASCIC := Empty_Text;
+      Full_Display    : Boolean := False;
+      Suppress_Header : Boolean := False;
+      Print_Routine   : Print_Routine_Type := Default_Print_Routine'Access);
+   --  Display information about a task rendezvous
+
+   procedure Trace_Output (Message_String : String);
+   --  Call Put_Output if Trace_on ("VMS")
+
+   procedure Write (Fd : Integer; S : String; Count : Integer);
+
+   --------------------
+   -- Announce_Event --
+   --------------------
+
+   procedure Announce_Event
+      (Event_EVCB    : Unsigned_Longword;
+       Print_Routine : Print_Routine_Type := Default_Print_Routine'Access)
+   is
+      EVCB : constant Ada_Event_Control_Block_Access := To_EVCB (Event_EVCB);
+
+      Event_Kind : constant Event_Kind_Type :=
+                     (if EVCB.Sub_Event /= 0
+                      then Event_Kind_Type (EVCB.Sub_Event)
+                      else Event_Kind_Type (EVCB.Code));
+
+      TI : constant String := "   Task %TASK !UI is ";
+      --  Announce prefix
+
+   begin
+      Trace_Output ("Announce called");
+
+      case Event_Kind is
+         when Debug_Event_Activating =>
+            Print_Routine (Print_FAO, Print_Newline,
+              To_UL (DoAC (TI & "about to begin its activation")),
+              EVCB.Value);
+         when Debug_Event_Exception_Terminated =>
+            Print_Routine (Print_FAO, Print_Newline,
+              To_UL (DoAC (TI & "terminating because of an exception")),
+              EVCB.Value);
+         when Debug_Event_Run =>
+            Print_Routine (Print_FAO, Print_Newline,
+              To_UL (DoAC (TI & "about to run")),
+              EVCB.Value);
+         when Debug_Event_Abort_Terminated =>
+            Print_Routine (Print_FAO, Print_Newline,
+              To_UL (DoAC (TI & "terminating because of abort")),
+              EVCB.Value);
+         when Debug_Event_Terminated =>
+            Print_Routine (Print_FAO, Print_Newline,
+              To_UL (DoAC (TI & "terminating normally")),
+              EVCB.Value);
+         when others => null;
+      end case;
+   end Announce_Event;
+
+   -------------------
+   -- Cleanup_Event --
+   -------------------
+
+   procedure Cleanup_Event (Event_EVCB  : Unsigned_Longword) is
+      EVCB : Ada_Event_Control_Block_Access := To_EVCB (Event_EVCB);
+   begin
+      Free (EVCB);
+   end Cleanup_Event;
+
+   ------------------------
+   -- Continue_All_Tasks --
+   ------------------------
+
+   procedure Continue_All_Tasks is
+   begin
+      null; --  VxWorks
+   end Continue_All_Tasks;
+
+   ------------
+   -- DBGEXT --
+   ------------
+
+   function DBGEXT
+     (Control_Block : DBGEXT_Control_Block_Access)
+      return System.Aux_DEC.Unsigned_Word
+   is
+      Print_Routine : Print_Routine_Type := Default_Print_Routine'Access;
+   begin
+      Trace_Output ("DBGEXT called");
+
+      if Control_Block.Print_Routine /= Address_Zero then
+         Print_Routine := To_Print_Routine_Type (Control_Block.Print_Routine);
+      end if;
+
+      case Control_Block.Function_Code is
+
+         --  Convert a task value to a task number.
+         --  The output results are stored in the CONTROL_BLOCK.
+
+         when K_CVT_VALUE_NUM =>
+            Trace_Output ("DBGEXT param 1 - CVT Value to NUM");
+            Control_Block.Task_Number :=
+              Control_Block.Task_Value.Known_Tasks_Index + 1;
+            Control_Block.Status := K_SUCCESS;
+            Trace_Output ("Task Number: ");
+            Trace_Output (Integer'Image (Control_Block.Task_Number));
+            return SS_NORMAL;
+
+         --  Convert a task number to a task value.
+         --  The output results are stored in the CONTROL_BLOCK.
+
+         when K_CVT_NUM_VALUE =>
+            Trace_Output ("DBGEXT param 2 - CVT NUM to Value");
+            Trace_Output ("Task Number: ");
+            Trace_Output (Integer'Image (Control_Block.Task_Number));
+            Control_Block.Task_Value :=
+              Known_Tasks (Control_Block.Task_Number - 1);
+            Control_Block.Status := K_SUCCESS;
+            Trace_Output ("Task Value: ");
+            Trace_Output (Unsigned_Longword'Image
+              (To_UL (Control_Block.Task_Value)));
+            return SS_NORMAL;
+
+         --  Obtain the "next" task after a specified task.
+         --  ??? To do: If specified check the PRIORITY, STATE, and HOLD
+         --  fields to restrict the selection of the next task.
+         --  The output results are stored in the CONTROL_BLOCK.
+
+         when K_NEXT_TASK =>
+            Trace_Output ("DBGEXT param 3 - Next Task");
+            Trace_Output ("Task Value: ");
+            Trace_Output (Unsigned_Longword'Image
+              (To_UL (Control_Block.Task_Value)));
+
+            if Control_Block.Task_Value = null then
+               Control_Block.Task_Value := Known_Tasks (Known_Tasks'First);
+            else
+               Control_Block.Task_Value :=
+                 Known_Tasks (Control_Block.Task_Value.Known_Tasks_Index + 1);
+            end if;
+
+            if Control_Block.Task_Value = null then
+               Control_Block.Task_Value := Known_Tasks (Known_Tasks'First);
+            end if;
+
+            Control_Block.Status := K_SUCCESS;
+            return SS_NORMAL;
+
+         --  Display the state of a task. The FULL bit is checked to decide if
+         --  a full or brief task display is desired. The output results are
+         --  stored in the CONTROL_BLOCK.
+
+         when K_SHOW_TASK =>
+            Trace_Output ("DBGEXT param 4 - Show Task");
+
+            if Control_Block.Task_Value = null then
+               Control_Block.Status := K_TASK_NOT_EXIST;
+            else
+               Show_One_Task
+                 (Control_Block.Task_Value,
+                  Control_Block.Ada_Flags (V_Full_Display),
+                  Control_Block.Ada_Flags (V_Suppress_Header),
+                  Print_Routine);
+
+               Control_Block.Status := K_SUCCESS;
+            end if;
+
+            return SS_NORMAL;
+
+         --  Enable a requested DEBUG tasking event
+
+         when K_ENABLE_EVENT =>
+            Trace_Output ("DBGEXT param 17 - Enable Event");
+            Enable_Event
+              (Control_Block.Flags,
+               Control_Block.Event_Value_or_Name,
+               Control_Block.Event_Code_or_EVCB,
+               Control_Block.Status);
+
+            return SS_NORMAL;
+
+         --  Disable a DEBUG tasking event
+
+         when K_DISABLE_EVENT =>
+            Trace_Output ("DBGEXT param 18 - Disable Event");
+            Disable_Event
+              (Control_Block.Flags,
+               Control_Block.Event_Value_or_Name,
+               Control_Block.Event_Code_or_EVCB,
+               Control_Block.Status);
+
+            return SS_NORMAL;
+
+         --  Announce the occurence of a DEBUG tasking event
+
+         when K_ANNOUNCE_EVENT =>
+            Trace_Output ("DBGEXT param 19 - Announce Event");
+            Announce_Event
+              (Control_Block.Event_Code_or_EVCB,
+               Print_Routine);
+
+            Control_Block.Status := K_SUCCESS;
+            return SS_NORMAL;
+
+         --  After DEBUG has processed an event that has signalled,
+         --  the signaller must cleanup.
+         --  Cleanup consists of freeing the event control block.
+
+         when K_CLEANUP_EVENT =>
+            Trace_Output ("DBGEXT param 24 - Cleanup Event");
+            Cleanup_Event (Control_Block.Event_Code_or_EVCB);
+
+            Control_Block.Status := K_SUCCESS;
+            return SS_NORMAL;
+
+         --  Show what events are available
+
+         when K_SHOW_EVENT_DEF =>
+            Trace_Output ("DBGEXT param 25 - Show Event Def");
+            Show_Event (Print_Routine);
+
+            Control_Block.Status := K_SUCCESS;
+            return SS_NORMAL;
+
+         --  Convert an event code to the address of the event entry
+
+         when K_FIND_EVENT_BY_CODE =>
+            Trace_Output ("DBGEXT param 29 - Find Event by Code");
+            Find_Event_By_Code
+              (Control_Block.Event_Code_or_EVCB,
+               Control_Block.Event_Entry,
+               Control_Block.Status);
+
+            return SS_NORMAL;
+
+         --  Find an event entry given the event name
+
+         when K_FIND_EVENT_BY_NAME =>
+            Trace_Output ("DBGEXT param 30 - Find Event by Name");
+            Find_Event_By_Name
+              (Control_Block.Event_Value_or_Name,
+               Control_Block.Event_Entry,
+               Control_Block.Status);
+            return SS_NORMAL;
+
+         --  ??? To do: Implement priority events
+         --  Get, set or restore a task's priority
+
+         when K_GET_PRIORITY or K_SET_PRIORITY or K_RESTORE_PRIORITY =>
+            Trace_Output ("DBGEXT priority param - Not yet implemented");
+            Trace_Output (Function_Codes'Image
+             (Control_Block.Function_Code));
+            return SS_BADPARAM;
+
+         --  ??? To do: Implement show statistics event
+         --  Display task statistics
+
+         when K_SHOW_STAT =>
+            Trace_Output ("DBGEXT show stat param - Not yet implemented");
+            Trace_Output (Function_Codes'Image
+             (Control_Block.Function_Code));
+            return SS_BADPARAM;
+
+         --  ??? To do: Implement get caller event
+         --  Obtain the caller of a task in a rendezvous. If no rendezvous,
+         --  null is returned
+
+         when K_GET_CALLER =>
+            Trace_Output ("DBGEXT get caller param - Not yet implemented");
+            Trace_Output (Function_Codes'Image
+             (Control_Block.Function_Code));
+            return SS_BADPARAM;
+
+         --  ??? To do: Implement set terminate event
+         --  Terminate a task
+
+         when K_SET_ABORT =>
+            Trace_Output ("DBGEXT set terminate param - Not yet implemented");
+            Trace_Output (Function_Codes'Image
+             (Control_Block.Function_Code));
+            return SS_BADPARAM;
+
+         --  ??? To do: Implement show deadlock event
+         --  Detect a deadlock
+
+         when K_SHOW_DEADLOCK =>
+            Trace_Output ("DBGEXT show deadlock param - Not yet implemented");
+            Trace_Output (Function_Codes'Image
+             (Control_Block.Function_Code));
+            return SS_BADPARAM;
+
+         when others =>
+            Trace_Output ("DBGEXT bad param: ");
+            Trace_Output (Function_Codes'Image
+             (Control_Block.Function_Code));
+            return SS_BADPARAM;
+
+      end case;
+   end DBGEXT;
+
+   ---------------------------
+   -- Default_Print_Routine --
+   ---------------------------
+
+   procedure Default_Print_Routine
+     (Print_Function    : Print_Functions;
+      Print_Subfunction : Print_Functions;
+      P1                : Unsigned_Longword := 0;
+      P2                : Unsigned_Longword := 0;
+      P3                : Unsigned_Longword := 0;
+      P4                : Unsigned_Longword := 0;
+      P5                : Unsigned_Longword := 0;
+      P6                : Unsigned_Longword := 0)
+   is
+      Status    : Cond_Value_Type;
+      Linlen    : Unsigned_Word;
+      Item_List : Unsigned_Longword_Array (1 .. 17) :=
+        (1 .. 17 => 0);
+   begin
+
+      case Print_Function is
+         when Print_Control | Print_String =>
+            null;
+
+         --  Formatted Ascii Output
+
+         when Print_FAO =>
+            Item_List (1) := P2;
+            Item_List (2) := P3;
+            Item_List (3) := P4;
+            Item_List (4) := P5;
+            Item_List (5) := P6;
+            FAOL
+              (Status,
+               To_AASCIC (P1).Text,
+               Linlen,
+               Print_Routine_Linbuf
+                 (1 + Print_Routine_Bufcnt .. Print_Routine_Bufsiz),
+               Item_List);
+
+            Print_Routine_Bufcnt := Print_Routine_Bufcnt + Integer (Linlen);
+
+         --  Symbolic output
+
+         when Print_Symbol =>
+            Item_List (1) := P1;
+            FAOL
+              (Status,
+               "!XI",
+               Linlen,
+               Print_Routine_Linbuf
+                 (1 + Print_Routine_Bufcnt .. Print_Routine_Bufsiz),
+               Item_List);
+
+            Print_Routine_Bufcnt := Print_Routine_Bufcnt + Integer (Linlen);
+
+         when others =>
+            null;
+      end case;
+
+      case Print_Subfunction is
+
+         --  Output buffer with a terminating newline
+
+         when Print_Newline =>
+            Put_Output (Status,
+              Print_Routine_Linbuf (1 .. Print_Routine_Bufcnt));
+            Print_Routine_Bufcnt := 0;
+
+         --  Buffer the output
+
+         when No_Print =>
+            null;
+
+         when others =>
+            null;
+      end case;
+
+   end Default_Print_Routine;
+
+   -------------------
+   -- Disable_Event --
+   -------------------
+
+   procedure Disable_Event
+      (Flags       : Bit_Array_32;
+       Event_Value : Unsigned_Longword;
+       Event_Code  : Unsigned_Longword;
+       Status      : out Cond_Value_Type)
+   is
+      Task_Value : Task_Id;
+      Task_Index : constant Integer := Integer (Event_Value) - 1;
+   begin
+
+      Events_Enabled_Count := Events_Enabled_Count - 1;
+
+      if Flags (V_EVNT_ALL) then
+         Global_Task_Debug_Events (Integer (Event_Code)) := False;
+         Status := K_SUCCESS;
+      else
+         if Task_Index in Known_Tasks'Range then
+            Task_Value := Known_Tasks (Task_Index);
+            if Task_Value /= null then
+               Task_Value.Common.Debug_Events (Integer (Event_Code)) := False;
+               Status := K_SUCCESS;
+            else
+               Status := K_TASK_NOT_EXIST;
+            end if;
+         else
+            Status := K_TASK_NOT_EXIST;
+         end if;
+      end if;
+
+      --  Keep count of events for efficiency
+
+      if Events_Enabled_Count <= 0 then
+         Events_Enabled_Count := 0;
+         Global_Task_Debug_Event_Set := False;
+      end if;
+
+   end Disable_Event;
+
+   ----------
+   -- DoAC --
+   ----------
+
+   function DoAC (S : String) return Address is
+   begin
+      AC_Buffer.Count := S'Length;
+      AC_Buffer.Text (1 .. AC_Buffer.Count) := S;
+      return AC_Buffer'Address;
+   end DoAC;
+
+   ------------------
+   -- Enable_Event --
+   ------------------
+
+   procedure Enable_Event
+      (Flags       : Bit_Array_32;
+       Event_Value : Unsigned_Longword;
+       Event_Code  : Unsigned_Longword;
+       Status      : out Cond_Value_Type)
+   is
+      Task_Value : Task_Id;
+      Task_Index : constant Integer := Integer (Event_Value) - 1;
+   begin
+
+      --  At least one event enabled, any and all events will cause a
+      --  condition to be raised and checked. Major tasking slowdown!
+
+      Global_Task_Debug_Event_Set := True;
+      Events_Enabled_Count := Events_Enabled_Count + 1;
+
+      if Flags (V_EVNT_ALL) then
+         Global_Task_Debug_Events (Integer (Event_Code)) := True;
+         Status := K_SUCCESS;
+      else
+         if Task_Index in Known_Tasks'Range then
+            Task_Value := Known_Tasks (Task_Index);
+            if Task_Value /= null then
+               Task_Value.Common.Debug_Events (Integer (Event_Code)) := True;
+               Status := K_SUCCESS;
+            else
+               Status := K_TASK_NOT_EXIST;
+            end if;
+         else
+            Status := K_TASK_NOT_EXIST;
+         end if;
+      end if;
+
+   end Enable_Event;
+
+   ------------------------
+   -- Find_Event_By_Code --
+   ------------------------
+
+   procedure Find_Event_By_Code
+      (Event_Code  : Unsigned_Longword;
+       Event_Entry : out Unsigned_Longword;
+       Status      : out Cond_Value_Type)
+   is
+      K_SUCCESS        : constant := 1;
+      K_NO_SUCH_EVENT  : constant := 9;
+
+   begin
+      Trace_Output ("Looking for Event: ");
+      Trace_Output (Unsigned_Longword'Image (Event_Code));
+
+      for I in Event_Kind_Type'Range loop
+         if Event_Code = Unsigned_Longword (Event_Directory (I).Code) then
+            Event_Entry := To_UL (Event_Directory (I)'Address);
+            Trace_Output ("Found Event # ");
+            Trace_Output (Integer'Image (I));
+            Status := K_SUCCESS;
+            return;
+         end if;
+      end loop;
+
+      Status := K_NO_SUCH_EVENT;
+   end Find_Event_By_Code;
+
+   ------------------------
+   -- Find_Event_By_Name --
+   ------------------------
+
+   procedure Find_Event_By_Name
+      (Event_Name  : Unsigned_Longword;
+       Event_Entry : out Unsigned_Longword;
+       Status      : out Cond_Value_Type)
+   is
+      K_SUCCESS        : constant := 1;
+      K_NO_SUCH_EVENT  : constant := 9;
+
+      Event_Name_Cstr : constant ASCIC := To_AASCIC (Event_Name).all;
+   begin
+      Trace_Output ("Looking for Event: ");
+      Trace_Output (Event_Name_Cstr.Text);
+
+      for I in Event_Kind_Type'Range loop
+         if Event_Name_Cstr.Count >= Event_Directory (I).Minchr
+            and then Event_Name_Cstr.Count <= Event_Directory (I).Name.Count
+            and then Event_Name_Cstr.Text (1 .. Event_Directory (I).Minchr) =
+                Event_Directory (I).Name.Text (1 .. Event_Directory (I).Minchr)
+         then
+            Event_Entry := To_UL (Event_Directory (I)'Address);
+            Trace_Output ("Found Event # ");
+            Trace_Output (Integer'Image (I));
+            Status := K_SUCCESS;
+            return;
+         end if;
+      end loop;
+
+      Status := K_NO_SUCH_EVENT;
+   end Find_Event_By_Name;
+
+   --------------------
+   -- Get_User_State --
+   --------------------
+
+   function Get_User_State return Long_Integer is
+   begin
+      return STPO.Self.User_State;
+   end Get_User_State;
+
+   ------------------------
+   -- List_Entry_Waiters --
+   ------------------------
+
+   procedure List_Entry_Waiters
+     (Task_Value      : Task_Id;
+      Full_Display    : Boolean := False;
+      Suppress_Header : Boolean := False;
+      Print_Routine   : Print_Routine_Type := Default_Print_Routine'Access)
+   is
+      pragma Unreferenced (Suppress_Header);
+
+      Entry_Call : Entry_Call_Link;
+      Have_Some  : Boolean := False;
+   begin
+      if not Full_Display then
+         return;
+      end if;
+
+      if Task_Value.Entry_Queues'Length > 0 then
+         Print_Routine (Print_FAO, Print_Newline,
+           To_UL (DoAC ("        Waiting entry callers:")));
+      end if;
+      for I in Task_Value.Entry_Queues'Range loop
+         Entry_Call := Task_Value.Entry_Queues (I).Head;
+         if Entry_Call /= null then
+            Have_Some := True;
+
+            Print_Routine (Print_FAO, Print_Newline,
+              To_UL (DoAC ("          Waiters for entry !UI:")),
+              To_UL (I));
+
+            loop
+               declare
+                  Task_Image : ASCIC :=
+                   (Entry_Call.Self.Common.Task_Image_Len,
+                    Entry_Call.Self.Common.Task_Image
+                     (1 .. Entry_Call.Self.Common.Task_Image_Len));
+               begin
+                  Print_Routine (Print_FAO, Print_Newline,
+                    To_UL (DoAC ("              %TASK !UI, type: !AC")),
+                    To_UL (Entry_Call.Self.Known_Tasks_Index + 1),
+                    To_UL (Task_Image'Address));
+                  if Entry_Call = Task_Value.Entry_Queues (I).Tail then
+                     exit;
+                  end if;
+                  Entry_Call := Entry_Call.Next;
+               end;
+            end loop;
+         end if;
+      end loop;
+      if not Have_Some then
+         Print_Routine (Print_FAO, Print_Newline,
+           To_UL (DoAC ("          none.")));
+      end if;
+   end List_Entry_Waiters;
+
+   ----------------
+   -- List_Tasks --
+   ----------------
+
+   procedure List_Tasks is
+      C : Task_Id;
+   begin
+      C := All_Tasks_List;
+
+      while C /= null loop
+         Print_Task_Info (C);
+         C := C.Common.All_Tasks_Link;
+      end loop;
+   end List_Tasks;
+
+   ------------------------
+   -- Print_Current_Task --
+   ------------------------
+
+   procedure Print_Current_Task is
+   begin
+      Print_Task_Info (STPO.Self);
+   end Print_Current_Task;
+
+   ---------------------
+   -- Print_Task_Info --
+   ---------------------
+
+   procedure Print_Task_Info (T : Task_Id) is
+      Entry_Call : Entry_Call_Link;
+      Parent     : Task_Id;
+
+   begin
+      if T = null then
+         Put_Line ("null task");
+         return;
+      end if;
+
+      Put (T.Common.Task_Image (1 .. T.Common.Task_Image_Len) & ": " &
+           Task_States'Image (T.Common.State));
+
+      Parent := T.Common.Parent;
+
+      if Parent = null then
+         Put (", parent: <none>");
+      else
+         Put (", parent: " &
+              Parent.Common.Task_Image (1 .. Parent.Common.Task_Image_Len));
+      end if;
+
+      Put (", prio:" & T.Common.Current_Priority'Img);
+
+      if not T.Callable then
+         Put (", not callable");
+      end if;
+
+      if T.Aborting then
+         Put (", aborting");
+      end if;
+
+      if T.Deferral_Level /= 0 then
+         Put (", abort deferred");
+      end if;
+
+      if T.Common.Call /= null then
+         Entry_Call := T.Common.Call;
+         Put (", serving:");
+
+         while Entry_Call /= null loop
+            Put (To_Integer (Entry_Call.Self)'Img);
+            Entry_Call := Entry_Call.Acceptor_Prev_Call;
+         end loop;
+      end if;
+
+      if T.Open_Accepts /= null then
+         Put (", accepting:");
+
+         for J in T.Open_Accepts'Range loop
+            Put (T.Open_Accepts (J).S'Img);
+         end loop;
+
+         if T.Terminate_Alternative then
+            Put (" or terminate");
+         end if;
+      end if;
+
+      if T.User_State /= 0 then
+         Put (", state:" & T.User_State'Img);
+      end if;
+
+      Put_Line;
+   end Print_Task_Info;
+
+   ---------
+   -- Put --
+   ---------
+
+   procedure Put (S : String) is
+   begin
+      Write (2, S, S'Length);
+   end Put;
+
+   --------------
+   -- Put_Line --
+   --------------
+
+   procedure Put_Line (S : String := "") is
+   begin
+      Write (2, S & ASCII.LF, S'Length + 1);
+   end Put_Line;
+
+   ----------------------
+   -- Resume_All_Tasks --
+   ----------------------
+
+   procedure Resume_All_Tasks (Thread_Self : OS_Interface.Thread_Id) is
+      pragma Unreferenced (Thread_Self);
+   begin
+      null; --  VxWorks
+   end Resume_All_Tasks;
+
+   ---------------
+   -- Set_Trace --
+   ---------------
+
+   procedure Set_Trace (Flag  : Character; Value : Boolean := True) is
+   begin
+      Trace_On (Flag) := Value;
+   end Set_Trace;
+
+   --------------------
+   -- Set_User_State --
+   --------------------
+
+   procedure Set_User_State (Value : Long_Integer) is
+   begin
+      STPO.Self.User_State := Value;
+   end Set_User_State;
+
+   ----------------
+   -- Show_Event --
+   ----------------
+
+   procedure Show_Event
+      (Print_Routine : Print_Routine_Type := Default_Print_Routine'Access)
+   is
+   begin
+      for I in Event_Def_Help'Range loop
+         Print_Routine (Print_FAO, Print_Newline, To_UL (Event_Def_Help (I)));
+      end loop;
+
+      for I in Event_Kind_Type'Range loop
+         Print_Routine (Print_FAO, Print_Newline,
+           To_UL (Event_Directory
+                   (Global_Event_Display_Order (I)).Name'Address));
+         Print_Routine (Print_FAO, Print_Newline,
+           To_UL (Event_Directory (Global_Event_Display_Order (I)).Help));
+      end loop;
+   end Show_Event;
+
+   --------------------
+   -- Show_One_Task --
+   --------------------
+
+   procedure Show_One_Task
+     (Task_Value      : Task_Id;
+      Full_Display    : Boolean := False;
+      Suppress_Header : Boolean := False;
+      Print_Routine   : Print_Routine_Type := Default_Print_Routine'Access)
+   is
+      Task_SP            : System.Address := Address_Zero;
+      Stack_Base         : System.Address := Address_Zero;
+      Stack_Top          : System.Address := Address_Zero;
+      TCB_Size           : Unsigned_Longword := 0;
+      CMA_TCB_Size       : Unsigned_Longword := 0;
+      Stack_Guard_Size   : Unsigned_Longword := 0;
+      Total_Task_Storage : Unsigned_Longword := 0;
+      Stack_In_Use       : Unsigned_Longword := 0;
+      Reserved_Size      : Unsigned_Longword := 0;
+      Hold_Flag          : Unsigned_Longword := 0;
+      Sched_State        : Unsigned_Longword := 0;
+      User_Prio          : Unsigned_Longword := 0;
+      Stack_Size         : Unsigned_Longword := 0;
+      Run_State          : Boolean := False;
+      Rea_State          : Boolean := False;
+      Sus_State          : Boolean := False;
+      Ter_State          : Boolean := False;
+
+      Current_Flag : AASCIC := NoStar;
+      Hold_String  : AASCIC := NoHold;
+      Ada_State    : AASCIC := Ada_State_Invalid_State;
+      Debug_State  : AASCIC := Debug_State_Emp;
+
+      Ada_State_Len   : constant Unsigned_Longword := 17;
+      Debug_State_Len : constant Unsigned_Longword := 5;
+
+      Entry_Call : Entry_Call_Record;
+
+   begin
+
+      --  Initialize local task info variables
+
+      Task_SP := Address_Zero;
+      Stack_Base := Address_Zero;
+      Stack_Top := Address_Zero;
+      CMA_TCB_Size := 0;
+      Stack_Guard_Size := 0;
+      Reserved_Size := 0;
+      Hold_Flag := 0;
+      Sched_State := 0;
+      TCB_Size := Unsigned_Longword (Task_Id'Size);
+
+      if not Suppress_Header or else Full_Display then
+         Print_Routine (Print_FAO, Print_Newline, To_UL (Empty_Text));
+         Print_Routine (Print_FAO, Print_Newline, To_UL (Header));
+      end if;
+
+      Trace_Output ("Show_One_Task Task Value: ");
+      Trace_Output (Unsigned_Longword'Image (To_UL (Task_Value)));
+
+      --  Callback to DEBUG to get some task info
+
+      if Task_Value.Common.State /= Terminated then
+         Debug_Get
+           (STPO.Get_Thread_Id (Task_Value),
+            CMA_C_DEBGET_STACKPTR,
+            Task_SP,
+            8);
+
+         Debug_Get
+           (STPO.Get_Thread_Id (Task_Value),
+            CMA_C_DEBGET_TCB_SIZE,
+            CMA_TCB_Size,
+            4);
+
+         Debug_Get
+           (STPO.Get_Thread_Id (Task_Value),
+            CMA_C_DEBGET_GUARDSIZE,
+            Stack_Guard_Size,
+            4);
+
+         Debug_Get
+           (STPO.Get_Thread_Id (Task_Value),
+            CMA_C_DEBGET_YELLOWSIZE,
+            Reserved_Size,
+            4);
+
+         Debug_Get
+           (STPO.Get_Thread_Id (Task_Value),
+            CMA_C_DEBGET_STACK_BASE,
+            Stack_Base,
+            8);
+
+         Debug_Get
+           (STPO.Get_Thread_Id (Task_Value),
+            CMA_C_DEBGET_STACK_TOP,
+            Stack_Top,
+            8);
+
+         Stack_Size := Unsigned_Longword (Stack_Base - Stack_Top)
+           - Reserved_Size - Stack_Guard_Size;
+         Stack_In_Use := Unsigned_Longword (Stack_Base - Task_SP) + 4;
+         Total_Task_Storage := TCB_Size + Stack_Size + Stack_Guard_Size
+           + Reserved_Size + CMA_TCB_Size;
+
+         Debug_Get
+           (STPO.Get_Thread_Id (Task_Value),
+            CMA_C_DEBGET_IS_HELD,
+            Hold_Flag,
+            4);
+
+         Hold_String := (if Hold_Flag /= 0 then Hold else NoHold);
+
+         Debug_Get
+           (STPO.Get_Thread_Id (Task_Value),
+            CMA_C_DEBGET_SCHED_STATE,
+            Sched_State,
+            4);
+      end if;
+
+      Run_State := False;
+      Rea_State := False;
+      Sus_State := Task_Value.Common.State = Unactivated;
+      Ter_State := Task_Value.Common.State = Terminated;
+
+      if not Ter_State then
+         Run_State := Sched_State = 0;
+         Rea_State := Sched_State = 1;
+         Sus_State := Sched_State /= 0 and Sched_State /= 1;
+      end if;
+
+      --  Set the debug state
+
+      if Run_State then
+         Debug_State := Debug_State_Run;
+      elsif Rea_State then
+         Debug_State := Debug_State_Rea;
+      elsif Sus_State then
+         Debug_State := Debug_State_Sus;
+      elsif Ter_State then
+         Debug_State := Debug_State_Ter;
+      end if;
+
+      Trace_Output ("Before case State: ");
+      Trace_Output (Task_States'Image (Task_Value.Common.State));
+
+      --  Set the Ada state
+
+      case Task_Value.Common.State is
+         when Unactivated =>
+            Ada_State := Ada_State_Not_Yet_Activated;
+
+         when Activating =>
+            Ada_State := Ada_State_Activating;
+
+         when Runnable =>
+            Ada_State := Ada_State_Runnable;
+
+         when Terminated =>
+            Ada_State := Ada_State_Terminated;
+
+         when Activator_Sleep =>
+            Ada_State := Ada_State_Activating_Tasks;
+
+         when Acceptor_Sleep =>
+            Ada_State := Ada_State_Accept;
+
+         when Acceptor_Delay_Sleep =>
+            Ada_State := Ada_State_Select_or_Delay;
+
+         when Entry_Caller_Sleep =>
+            Entry_Call :=
+              Task_Value.Entry_Calls (Task_Value.ATC_Nesting_Level);
+
+            case Entry_Call.Mode is
+               when Simple_Call =>
+                  Ada_State := Ada_State_Entry_Call;
+               when Conditional_Call =>
+                  Ada_State := Ada_State_Cond_Entry_Call;
+               when Timed_Call =>
+                  Ada_State := Ada_State_Timed_Entry_Call;
+               when Asynchronous_Call =>
+                  Ada_State := Ada_State_Async_Entry_Call;
+            end case;
+
+         when Async_Select_Sleep =>
+            Ada_State := Ada_State_Select_or_Abort;
+
+         when Delay_Sleep =>
+            Ada_State := Ada_State_Delay;
+
+         when Master_Completion_Sleep =>
+            Ada_State := Ada_State_Completed;
+
+         when Master_Phase_2_Sleep =>
+            Ada_State := Ada_State_Completed;
+
+         when Interrupt_Server_Idle_Sleep |
+              Interrupt_Server_Blocked_Interrupt_Sleep |
+              Timer_Server_Sleep |
+              Interrupt_Server_Blocked_On_Event_Flag =>
+            Ada_State := Ada_State_Server;
+
+         when AST_Server_Sleep =>
+            Ada_State := Ada_State_IO_or_AST;
+
+         when Asynchronous_Hold =>
+            Ada_State := Ada_State_Async_Hold;
+
+      end case;
+
+      if Task_Value.Terminate_Alternative then
+         Ada_State := Ada_State_Select_or_Term;
+      end if;
+
+      if Task_Value.Aborting then
+         Ada_State := Ada_State_Aborting;
+      end if;
+
+      User_Prio := To_UL (Task_Value.Common.Current_Priority);
+      Trace_Output ("After user_prio");
+
+      --  Flag the current task
+
+      Current_Flag := (if Task_Value = Self then Star else NoStar);
+
+      --  Show task info
+
+      Print_Routine (Print_FAO, No_Print, To_UL (DoAC ("!AC%TASK !5<!UI!>")),
+        To_UL (Current_Flag), To_UL (Task_Value.Known_Tasks_Index + 1));
+
+      Print_Routine (Print_FAO, No_Print, To_UL (DoAC ("!2UB")), User_Prio);
+
+      Print_Routine (Print_FAO, No_Print, To_UL (DoAC (" !AC !5AD !17AD ")),
+        To_UL (Hold_String), Debug_State_Len, To_UL (Debug_State),
+        Ada_State_Len, To_UL (Ada_State));
+
+--      Print_Routine (Print_Symbol, Print_Newline,
+--         Fetch (To_Addr (Task_Value.Common.Task_Entry_Point)));
+
+      Print_Routine (Print_FAO, Print_Newline, To_UL (Empty_Text));
+
+      --  If /full qualfier passed, show detailed info
+
+      if Full_Display then
+         Show_Rendezvous (Task_Value, Ada_State, Full_Display,
+           Suppress_Header, Print_Routine);
+
+         List_Entry_Waiters (Task_Value, Full_Display,
+           Suppress_Header, Print_Routine);
+
+         Print_Routine (Print_FAO, Print_Newline, To_UL (Empty_Text));
+
+         declare
+            Task_Image : ASCIC := (Task_Value.Common.Task_Image_Len,
+              Task_Value.Common.Task_Image
+               (1 .. Task_Value.Common.Task_Image_Len));
+         begin
+            Print_Routine (Print_FAO, Print_Newline,
+              To_UL (DoAC ("        Task type:      !AC")),
+              To_UL (Task_Image'Address));
+         end;
+
+         --  How to find Creation_PC ???
+--         Print_Routine (Print_FAO, No_Print,
+--           To_UL (DoAC ("        Created at PC:  ")),
+--         Print_Routine (Print_FAO, Print_Newline, Creation_PC);
+
+         if Task_Value.Common.Parent /= null then
+            Print_Routine (Print_FAO, Print_Newline,
+              To_UL (DoAC ("        Parent task:    %TASK !UI")),
+              To_UL (Task_Value.Common.Parent.Known_Tasks_Index + 1));
+         else
+            Print_Routine (Print_FAO, Print_Newline,
+             To_UL (DoAC ("        Parent task:    none")));
+         end if;
+
+--         Print_Routine (Print_FAO, No_Print,
+--           To_UL (DoAC ("        Start PC:       ")));
+--         Print_Routine (Print_Symbol, Print_Newline,
+--            Fetch (To_Addr (Task_Value.Common.Task_Entry_Point)));
+
+         Print_Routine (Print_FAO, Print_Newline,
+          To_UL (DoAC (
+           "        Task control block:             Stack storage (bytes):")));
+
+         Print_Routine (Print_FAO, Print_Newline,
+          To_UL (DoAC (
+           "          Task value:   !10<!UI!>        RESERVED_BYTES:  !10UI")),
+          To_UL (Task_Value), Reserved_Size);
+
+         Print_Routine (Print_FAO, Print_Newline,
+          To_UL (DoAC (
+           "          Entries:      !10<!UI!>        TOP_GUARD_SIZE:  !10UI")),
+          To_UL (Task_Value.Entry_Num), Stack_Guard_Size);
+
+         Print_Routine (Print_FAO, Print_Newline,
+          To_UL (DoAC (
+           "          Size:         !10<!UI!>        STORAGE_SIZE:    !10UI")),
+          TCB_Size + CMA_TCB_Size, Stack_Size);
+
+         Print_Routine (Print_FAO, Print_Newline,
+          To_UL (DoAC (
+           "        Stack addresses:                 Bytes in use:    !10UI")),
+          Stack_In_Use);
+
+         Print_Routine (Print_FAO, Print_Newline,
+          To_UL (DoAC ("          Top address:  !10<!XI!>")),
+          To_UL (Stack_Top));
+
+         Print_Routine (Print_FAO, Print_Newline,
+          To_UL (DoAC (
+           "          Base address: !10<!XI!>      Total storage:     !10UI")),
+          To_UL (Stack_Base), Total_Task_Storage);
+      end if;
+
+   end Show_One_Task;
+
+   ---------------------
+   -- Show_Rendezvous --
+   ---------------------
+
+   procedure Show_Rendezvous
+     (Task_Value      : Task_Id;
+      Ada_State       : AASCIC := Empty_Text;
+      Full_Display    : Boolean := False;
+      Suppress_Header : Boolean := False;
+      Print_Routine   : Print_Routine_Type := Default_Print_Routine'Access)
+   is
+      pragma Unreferenced (Ada_State);
+      pragma Unreferenced (Suppress_Header);
+
+      Temp_Entry  : Entry_Index;
+      Entry_Call  : Entry_Call_Record;
+      Called_Task : Task_Id;
+      AWR         : constant String := "        Awaiting rendezvous at: ";
+      --  Common prefix
+
+      procedure Print_Accepts;
+      --  Display information about task rendezvous accepts
+
+      procedure Print_Accepts is
+      begin
+         if Task_Value.Open_Accepts /= null then
+            for I in Task_Value.Open_Accepts'Range loop
+               Temp_Entry := Entry_Index (Task_Value.Open_Accepts (I).S);
+               declare
+                  Entry_Name_Image : ASCIC :=
+                    (Task_Value.Entry_Names (Temp_Entry).all'Length,
+                     Task_Value.Entry_Names (Temp_Entry).all);
+               begin
+                  Trace_Output ("Accept at: " & Entry_Name_Image.Text);
+                  Print_Routine (Print_FAO, Print_Newline,
+                    To_UL (DoAC ("             accept at: !AC")),
+                    To_UL (Entry_Name_Image'Address));
+               end;
+            end loop;
+         end if;
+      end Print_Accepts;
+   begin
+      if not Full_Display then
+         return;
+      end if;
+
+      Trace_Output ("Show_Rendezvous Task Value: ");
+      Trace_Output (Unsigned_Longword'Image (To_UL (Task_Value)));
+
+      if Task_Value.Common.State = Acceptor_Sleep and then
+         not Task_Value.Terminate_Alternative
+      then
+         if Task_Value.Open_Accepts /= null then
+            Temp_Entry := Entry_Index (Task_Value.Open_Accepts
+              (Task_Value.Open_Accepts'First).S);
+            declare
+               Entry_Name_Image : ASCIC :=
+                 (Task_Value.Entry_Names (Temp_Entry).all'Length,
+                  Task_Value.Entry_Names (Temp_Entry).all);
+            begin
+               Trace_Output (AWR & "accept " & Entry_Name_Image.Text);
+               Print_Routine (Print_FAO, Print_Newline,
+                 To_UL (DoAC (AWR & "accept !AC")),
+                 To_UL (Entry_Name_Image'Address));
+            end;
+
+         else
+            Print_Routine (Print_FAO, Print_Newline,
+              To_UL (DoAC ("        entry name unavailable")));
+         end if;
+      else
+         case Task_Value.Common.State is
+            when Acceptor_Sleep =>
+               Print_Routine (Print_FAO, Print_Newline,
+                 To_UL (DoAC (AWR & "select with terminate.")));
+               Print_Accepts;
+
+            when Async_Select_Sleep =>
+               Print_Routine (Print_FAO, Print_Newline,
+                 To_UL (DoAC (AWR & "select.")));
+               Print_Accepts;
+
+            when Acceptor_Delay_Sleep =>
+               Print_Routine (Print_FAO, Print_Newline,
+                 To_UL (DoAC (AWR & "select with delay.")));
+               Print_Accepts;
+
+            when Entry_Caller_Sleep =>
+               Entry_Call :=
+                 Task_Value.Entry_Calls (Task_Value.ATC_Nesting_Level);
+
+               case Entry_Call.Mode is
+                  when Simple_Call =>
+                     Print_Routine (Print_FAO, Print_Newline,
+                       To_UL (DoAC (AWR & "entry call")));
+                  when Conditional_Call =>
+                     Print_Routine (Print_FAO, Print_Newline,
+                       To_UL (DoAC (AWR & "entry call with else")));
+                  when Timed_Call =>
+                     Print_Routine (Print_FAO, Print_Newline,
+                       To_UL (DoAC (AWR & "entry call with delay")));
+                  when Asynchronous_Call =>
+                     Print_Routine (Print_FAO, Print_Newline,
+                        To_UL (DoAC (AWR & "entry call with abort")));
+               end case;
+               Called_Task := Entry_Call.Called_Task;
+               declare
+                  Task_Image : ASCIC := (Called_Task.Common.Task_Image_Len,
+                    Called_Task.Common.Task_Image
+                     (1 .. Called_Task.Common.Task_Image_Len));
+                  Entry_Name_Image : ASCIC :=
+                    (Called_Task.Entry_Names (Entry_Call.E).all'Length,
+                     Called_Task.Entry_Names (Entry_Call.E).all);
+               begin
+                  Print_Routine (Print_FAO, Print_Newline,
+                    To_UL (DoAC
+                     ("        for entry !AC in %TASK !UI type !AC")),
+                    To_UL (Entry_Name_Image'Address),
+                    To_UL (Called_Task.Known_Tasks_Index),
+                    To_UL (Task_Image'Address));
+               end;
+
+            when others =>
+               return;
+         end case;
+      end if;
+
+   end Show_Rendezvous;
+
+   ------------------------
+   -- Signal_Debug_Event --
+   ------------------------
+
+   procedure Signal_Debug_Event
+    (Event_Kind : Event_Kind_Type; Task_Value : Task_Id)
+   is
+      Do_Signal : Boolean;
+      EVCB      : Ada_Event_Control_Block_Access;
+
+      EVCB_Sent    : constant := 16#9B#;
+      Ada_Facility : constant := 49;
+      SS_DBGEVENT  : constant := 1729;
+   begin
+      Do_Signal := Global_Task_Debug_Events (Event_Kind);
+
+      if not Do_Signal then
+         if Task_Value /= null then
+            Do_Signal := Do_Signal
+              or else Task_Value.Common.Debug_Events (Event_Kind);
+         end if;
+      end if;
+
+      if Do_Signal then
+         --  Build an a tasking event control block and signal DEBUG
+
+         EVCB := new Ada_Event_Control_Block_Type;
+         EVCB.Code := Unsigned_Word (Event_Kind);
+         EVCB.Sentinal := EVCB_Sent;
+         EVCB.Facility := Ada_Facility;
+
+         if Task_Value /= null then
+            EVCB.Value := Unsigned_Longword (Task_Value.Known_Tasks_Index + 1);
+         else
+            EVCB.Value := 0;
+         end if;
+
+         EVCB.Sub_Event := 0;
+         EVCB.P1 := 0;
+         EVCB.Sigargs := 0;
+         EVCB.Flags := 0;
+         EVCB.Unused1 := 0;
+         EVCB.Unused2 := 0;
+
+         Signal (SS_DBGEVENT, 1, To_UL (EVCB));
+      end if;
+   end Signal_Debug_Event;
+
+   --------------------
+   -- Stop_All_Tasks --
+   --------------------
+
+   procedure Stop_All_Tasks is
+   begin
+      null; --  VxWorks
+   end Stop_All_Tasks;
+
+   ----------------------------
+   -- Stop_All_Tasks_Handler --
+   ----------------------------
+
+   procedure Stop_All_Tasks_Handler is
+   begin
+      null; --  VxWorks
+   end Stop_All_Tasks_Handler;
+
+   -----------------------
+   -- Suspend_All_Tasks --
+   -----------------------
+
+   procedure Suspend_All_Tasks (Thread_Self : OS_Interface.Thread_Id) is
+      pragma Unreferenced (Thread_Self);
+   begin
+      null; --  VxWorks
+   end Suspend_All_Tasks;
+
+   ------------------------
+   -- Task_Creation_Hook --
+   ------------------------
+
+   procedure Task_Creation_Hook (Thread : OS_Interface.Thread_Id) is
+      pragma Unreferenced (Thread);
+   begin
+      null; --  VxWorks
+   end Task_Creation_Hook;
+
+   ---------------------------
+   -- Task_Termination_Hook --
+   ---------------------------
+
+   procedure Task_Termination_Hook is
+   begin
+      null; --  VxWorks
+   end Task_Termination_Hook;
+
+   -----------
+   -- Trace --
+   -----------
+
+   procedure Trace
+     (Self_Id  : Task_Id;
+      Msg      : String;
+      Flag     : Character;
+      Other_Id : Task_Id := null)
+   is
+   begin
+      if Trace_On (Flag) then
+         Put (To_Integer (Self_Id)'Img &
+              ':' & Flag & ':' &
+              Self_Id.Common.Task_Image (1 .. Self_Id.Common.Task_Image_Len) &
+              ':');
+
+         if Other_Id /= null then
+            Put (To_Integer (Other_Id)'Img & ':');
+         end if;
+
+         Put_Line (Msg);
+      end if;
+   end Trace;
+
+   ------------------
+   -- Trace_Output --
+   ------------------
+
+   procedure Trace_Output (Message_String : String) is
+   begin
+      if Trace_On ('V') and Trace_On ('M') and Trace_On ('S') then
+         Put_Output (Message_String);
+      end if;
+   end Trace_Output;
+
+   -----------
+   -- Write --
+   -----------
+
+   procedure Write (Fd : Integer; S : String; Count : Integer) is
+      Discard : System.CRTL.ssize_t;
+      pragma Unreferenced (Discard);
+   begin
+      Discard := System.CRTL.write (Fd, S (S'First)'Address,
+                                    System.CRTL.size_t (Count));
+      --  Is it really right to ignore write errors here ???
+   end Write;
+
+end System.Tasking.Debug;