New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45952 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 998 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
+--                                                                          --
+--     S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S    --
+--                                                                          --
+--                                  B o d y                                 --
+--                                                                          --
+--                             $Revision: 1.26 $
+--                                                                          --
+--            Copyright (C) 1991-2001, Florida State University             --
+--                                                                          --
+-- GNARL 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 2,  or (at your option) any later ver- --
+-- sion. GNARL 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.  See the GNU General Public License --
+-- for  more details.  You should have  received  a copy of the GNU General --
+-- Public License  distributed with GNARL; see file COPYING.  If not, write --
+-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- As a special exception,  if other files  instantiate  generics from this --
+-- unit, or you link  this unit with other files  to produce an executable, --
+-- this  unit  does not  by itself cause  the resulting  executable  to  be --
+-- covered  by the  GNU  General  Public  License.  This exception does not --
+-- however invalidate  any other reasons why  the executable file  might be --
+-- covered by the  GNU Public License.                                      --
+--                                                                          --
+-- GNARL was developed by the GNARL team at Florida State University. It is --
+-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
+-- State University (http://www.gnat.com).                                  --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This is a IRIX (pthread library) version of this package.
+
+--  This package contains all the GNULL primitives that interface directly
+--  with the underlying OS.
+
+pragma Polling (Off);
+--  Turn off polling, we do not want ATC polling to take place during
+--  tasking operations. It causes infinite loops and other problems.
+
+with Interfaces.C;
+--  used for int
+--           size_t
+
+with System.Task_Info;
+
+with System.Tasking.Debug;
+--  used for Known_Tasks
+
+with System.IO;
+--  used for Put_Line
+
+with System.Interrupt_Management;
+--  used for Keep_Unmasked
+--           Abort_Task_Interrupt
+--           Interrupt_ID
+
+with System.Interrupt_Management.Operations;
+--  used for Set_Interrupt_Mask
+--           All_Tasks_Mask
+pragma Elaborate_All (System.Interrupt_Management.Operations);
+
+with System.Parameters;
+--  used for Size_Type
+
+with System.Tasking;
+--  used for Ada_Task_Control_Block
+--           Task_ID
+
+with System.Soft_Links;
+--  used for Defer/Undefer_Abort
+
+--  Note that we do not use System.Tasking.Initialization directly since
+--  this is a higher level package that we shouldn't depend on. For example
+--  when using the restricted run time, it is replaced by
+--  System.Tasking.Restricted.Initialization
+
+with System.Program_Info;
+--  used for Default_Task_Stack
+--           Default_Time_Slice
+--           Stack_Guard_Pages
+--           Pthread_Sched_Signal
+--           Pthread_Arena_Size
+
+with System.OS_Interface;
+--  used for various type, constant, and operations
+
+with System.OS_Primitives;
+--  used for Delay_Modes
+
+with Unchecked_Conversion;
+with Unchecked_Deallocation;
+
+package body System.Task_Primitives.Operations is
+
+   use System.Tasking;
+   use System.Tasking.Debug;
+   use Interfaces.C;
+   use System.OS_Interface;
+   use System.OS_Primitives;
+   use System.Parameters;
+
+   package SSL renames System.Soft_Links;
+
+   ------------------
+   --  Local Data  --
+   ------------------
+
+   --  The followings are logically constants, but need to be initialized
+   --  at run time.
+
+   ATCB_Key : aliased pthread_key_t;
+   --  Key used to find the Ada Task_ID associated with a thread
+
+   All_Tasks_L : aliased System.Task_Primitives.RTS_Lock;
+   --  See comments on locking rules in System.Locking_Rules (spec).
+
+   Environment_Task_ID : Task_ID;
+   --  A variable to hold Task_ID for the environment task.
+
+   Locking_Policy : Character;
+   pragma Import (C, Locking_Policy, "__gl_locking_policy");
+
+   Real_Time_Clock_Id : constant clockid_t := CLOCK_REALTIME;
+
+   Unblocked_Signal_Mask : aliased sigset_t;
+
+   -----------------------
+   -- Local Subprograms --
+   -----------------------
+
+   function To_Task_ID is new Unchecked_Conversion (System.Address, Task_ID);
+
+   function To_Address is new Unchecked_Conversion (Task_ID, System.Address);
+
+   procedure Abort_Handler (Sig : Signal);
+
+   -------------------
+   -- Abort_Handler --
+   -------------------
+
+   procedure Abort_Handler (Sig : Signal) is
+      T       : Task_ID := Self;
+      Result  : Interfaces.C.int;
+      Old_Set : aliased sigset_t;
+
+   begin
+      if T.Deferral_Level = 0
+        and then T.Pending_ATC_Level < T.ATC_Nesting_Level
+      then
+         --  Make sure signals used for RTS internal purpose are unmasked
+
+         Result := pthread_sigmask
+           (SIG_UNBLOCK,
+            Unblocked_Signal_Mask'Unchecked_Access,
+            Old_Set'Unchecked_Access);
+         pragma Assert (Result = 0);
+
+         raise Standard'Abort_Signal;
+      end if;
+   end Abort_Handler;
+
+   -----------------
+   -- Stack_Guard --
+   -----------------
+
+   --  The underlying thread system sets a guard page at the
+   --  bottom of a thread stack, so nothing is needed.
+
+   procedure Stack_Guard (T : ST.Task_ID; On : Boolean) is
+   begin
+      null;
+   end Stack_Guard;
+
+   -------------------
+   -- Get_Thread_Id --
+   -------------------
+
+   function Get_Thread_Id (T : ST.Task_ID) return OSI.Thread_Id is
+   begin
+      return T.Common.LL.Thread;
+   end Get_Thread_Id;
+
+   ----------
+   -- Self --
+   ----------
+
+   function Self return Task_ID is
+      Result : System.Address;
+
+   begin
+      Result := pthread_getspecific (ATCB_Key);
+      pragma Assert (Result /= System.Null_Address);
+
+      return To_Task_ID (Result);
+   end Self;
+
+   ---------------------
+   -- Initialize_Lock --
+   ---------------------
+
+   --  Note: mutexes and cond_variables needed per-task basis are
+   --        initialized in Intialize_TCB and the Storage_Error is
+   --        handled. Other mutexes (such as All_Tasks_Lock, Memory_Lock...)
+   --        used in RTS is initialized before any status change of RTS.
+   --        Therefore rasing Storage_Error in the following routines
+   --        should be able to be handled safely.
+
+   procedure Initialize_Lock
+     (Prio : System.Any_Priority;
+      L    : access Lock)
+   is
+      Attributes : aliased pthread_mutexattr_t;
+      Result     : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutexattr_init (Attributes'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result = ENOMEM then
+         raise Storage_Error;
+      end if;
+
+      if Locking_Policy = 'C' then
+         Result := pthread_mutexattr_setprotocol
+           (Attributes'Access, PTHREAD_PRIO_PROTECT);
+         pragma Assert (Result = 0);
+
+         Result := pthread_mutexattr_setprioceiling
+            (Attributes'Access, Interfaces.C.int (Prio));
+         pragma Assert (Result = 0);
+      end if;
+
+      Result := pthread_mutex_init (L, Attributes'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result = ENOMEM then
+         Result := pthread_mutexattr_destroy (Attributes'Access);
+         raise Storage_Error;
+      end if;
+
+      Result := pthread_mutexattr_destroy (Attributes'Access);
+      pragma Assert (Result = 0);
+   end Initialize_Lock;
+
+   procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
+      Attributes : aliased pthread_mutexattr_t;
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutexattr_init (Attributes'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result = ENOMEM then
+         raise Storage_Error;
+      end if;
+
+      if Locking_Policy = 'C' then
+         Result := pthread_mutexattr_setprotocol
+           (Attributes'Access, PTHREAD_PRIO_PROTECT);
+         pragma Assert (Result = 0);
+
+         Result := pthread_mutexattr_setprioceiling
+            (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
+         pragma Assert (Result = 0);
+      end if;
+
+      Result := pthread_mutex_init (L, Attributes'Access);
+
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result = ENOMEM then
+         Result := pthread_mutexattr_destroy (Attributes'Access);
+         raise Storage_Error;
+      end if;
+
+      Result := pthread_mutexattr_destroy (Attributes'Access);
+   end Initialize_Lock;
+
+   -------------------
+   -- Finalize_Lock --
+   -------------------
+
+   procedure Finalize_Lock (L : access Lock) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutex_destroy (L);
+      pragma Assert (Result = 0);
+   end Finalize_Lock;
+
+   procedure Finalize_Lock (L : access RTS_Lock) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutex_destroy (L);
+      pragma Assert (Result = 0);
+   end Finalize_Lock;
+
+   ----------------
+   -- Write_Lock --
+   ----------------
+
+   procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutex_lock (L);
+      Ceiling_Violation := Result = EINVAL;
+
+      --  assumes the cause of EINVAL is a priority ceiling violation
+
+      pragma Assert (Result = 0 or else Result = EINVAL);
+   end Write_Lock;
+
+   procedure Write_Lock (L : access RTS_Lock) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutex_lock (L);
+      pragma Assert (Result = 0);
+   end Write_Lock;
+
+   procedure Write_Lock (T : Task_ID) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutex_lock (T.Common.LL.L'Access);
+      pragma Assert (Result = 0);
+   end Write_Lock;
+
+   ---------------
+   -- Read_Lock --
+   ---------------
+
+   procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
+   begin
+      Write_Lock (L, Ceiling_Violation);
+   end Read_Lock;
+
+   ------------
+   -- Unlock --
+   ------------
+
+   procedure Unlock (L : access Lock) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutex_unlock (L);
+      pragma Assert (Result = 0);
+   end Unlock;
+
+   procedure Unlock (L : access RTS_Lock) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutex_unlock (L);
+      pragma Assert (Result = 0);
+   end Unlock;
+
+   procedure Unlock (T : Task_ID) is
+      Result : Interfaces.C.int;
+
+   begin
+      Result := pthread_mutex_unlock (T.Common.LL.L'Access);
+      pragma Assert (Result = 0);
+   end Unlock;
+
+   -----------
+   -- Sleep --
+   -----------
+
+   procedure Sleep
+     (Self_ID : ST.Task_ID;
+      Reason  : System.Tasking.Task_States)
+   is
+      Result : Interfaces.C.int;
+   begin
+      pragma Assert (Self_ID = Self);
+      Result := pthread_cond_wait (Self_ID.Common.LL.CV'Access,
+        Self_ID.Common.LL.L'Access);
+
+      --  EINTR is not considered a failure.
+
+      pragma Assert (Result = 0 or else Result = EINTR);
+   end Sleep;
+
+   -----------------
+   -- Timed_Sleep --
+   -----------------
+
+   procedure Timed_Sleep
+     (Self_ID  : Task_ID;
+      Time     : Duration;
+      Mode     : ST.Delay_Modes;
+      Reason   : Task_States;
+      Timedout : out Boolean;
+      Yielded  : out Boolean)
+   is
+      Check_Time : constant Duration := Monotonic_Clock;
+      Abs_Time   : Duration;
+      Request    : aliased timespec;
+      Result     : Interfaces.C.int;
+
+   begin
+      Timedout := True;
+      Yielded  := False;
+
+      if Mode = Relative then
+         Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
+      else
+         Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
+      end if;
+
+      if Abs_Time > Check_Time then
+         Request := To_Timespec (Abs_Time);
+
+         loop
+            exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
+              or else Self_ID.Pending_Priority_Change;
+
+            Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
+              Self_ID.Common.LL.L'Access, Request'Access);
+
+            exit when Abs_Time <= Monotonic_Clock;
+
+            if Result = 0 or else errno = EINTR then
+               Timedout := False;
+               exit;
+            end if;
+         end loop;
+      end if;
+   end Timed_Sleep;
+
+   -----------------
+   -- Timed_Delay --
+   -----------------
+
+   --  This is for use in implementing delay statements, so
+   --  we assume the caller is abort-deferred but is holding
+   --  no locks.
+
+   procedure Timed_Delay
+     (Self_ID : Task_ID;
+      Time    : Duration;
+      Mode    : ST.Delay_Modes)
+   is
+      Check_Time : constant Duration := Monotonic_Clock;
+      Abs_Time   : Duration;
+      Request    : aliased timespec;
+      Result     : Interfaces.C.int;
+
+   begin
+      --  Only the little window between deferring abort and
+      --  locking Self_ID is the reason we need to
+      --  check for pending abort and priority change below! :(
+
+      SSL.Abort_Defer.all;
+      Write_Lock (Self_ID);
+
+      if Mode = Relative then
+         Abs_Time := Time + Check_Time;
+      else
+         Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
+      end if;
+
+      if Abs_Time > Check_Time then
+         Request := To_Timespec (Abs_Time);
+         Self_ID.Common.State := Delay_Sleep;
+
+         loop
+            if Self_ID.Pending_Priority_Change then
+               Self_ID.Pending_Priority_Change := False;
+               Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
+               Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
+            end if;
+
+            exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
+
+            Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
+              Self_ID.Common.LL.L'Access, Request'Access);
+            exit when Abs_Time <= Monotonic_Clock;
+
+            pragma Assert (Result = 0
+              or else Result = ETIMEDOUT
+              or else Result = EINTR);
+         end loop;
+
+         Self_ID.Common.State := Runnable;
+      end if;
+
+      Unlock (Self_ID);
+      Yield;
+      SSL.Abort_Undefer.all;
+   end Timed_Delay;
+
+   ---------------------
+   -- Monotonic_Clock --
+   ---------------------
+
+   function Monotonic_Clock return Duration is
+      TS     : aliased timespec;
+      Result : Interfaces.C.int;
+
+   begin
+      Result := clock_gettime (Real_Time_Clock_Id, TS'Unchecked_Access);
+      pragma Assert (Result = 0);
+      return To_Duration (TS);
+   end Monotonic_Clock;
+
+   -------------------
+   -- RT_Resolution --
+   -------------------
+
+   function RT_Resolution return Duration is
+   begin
+      --  The clock_getres (Real_Time_Clock_Id) function appears to return
+      --  the interrupt resolution of the realtime clock and not the actual
+      --  resolution of reading the clock. Even though this last value is
+      --  only guaranteed to be 100 Hz, at least the Origin 200 appears to
+      --  have a microsecond resolution or better.
+      --  ??? We should figure out a method to return the right value on
+      --  all SGI hardware.
+
+      return 0.000_001; --  Assume microsecond resolution of clock
+   end RT_Resolution;
+
+   ------------
+   -- Wakeup --
+   ------------
+
+   procedure Wakeup (T : ST.Task_ID; Reason : System.Tasking.Task_States) is
+      Result : Interfaces.C.int;
+   begin
+      Result := pthread_cond_signal (T.Common.LL.CV'Access);
+      pragma Assert (Result = 0);
+   end Wakeup;
+
+   -----------
+   -- Yield --
+   -----------
+
+   procedure Yield (Do_Yield : Boolean := True) is
+      Result : Interfaces.C.int;
+   begin
+      if Do_Yield then
+         Result := sched_yield;
+      end if;
+   end Yield;
+
+   ------------------
+   -- Set_Priority --
+   ------------------
+
+   procedure Set_Priority
+     (T                   : Task_ID;
+      Prio                : System.Any_Priority;
+      Loss_Of_Inheritance : Boolean := False)
+   is
+      Result       : Interfaces.C.int;
+      Param        : aliased struct_sched_param;
+      Sched_Policy : Interfaces.C.int;
+
+      use type System.Task_Info.Task_Info_Type;
+
+      function To_Int is new Unchecked_Conversion
+        (System.Task_Info.Thread_Scheduling_Policy, Interfaces.C.int);
+
+   begin
+      T.Common.Current_Priority := Prio;
+      Param.sched_priority := Interfaces.C.int (Prio);
+
+      if T.Common.Task_Info /= null then
+         Sched_Policy := To_Int (T.Common.Task_Info.Policy);
+      else
+         Sched_Policy := SCHED_FIFO;
+      end if;
+
+      Result := pthread_setschedparam (T.Common.LL.Thread, Sched_Policy,
+        Param'Access);
+      pragma Assert (Result = 0);
+   end Set_Priority;
+
+   ------------------
+   -- Get_Priority --
+   ------------------
+
+   function Get_Priority (T : Task_ID) return System.Any_Priority is
+   begin
+      return T.Common.Current_Priority;
+   end Get_Priority;
+
+   ----------------
+   -- Enter_Task --
+   ----------------
+
+   procedure Enter_Task (Self_ID : Task_ID) is
+      Result : Interfaces.C.int;
+
+      function To_Int is new Unchecked_Conversion
+        (System.Task_Info.CPU_Number, Interfaces.C.int);
+
+      use System.Task_Info;
+
+   begin
+      Self_ID.Common.LL.Thread := pthread_self;
+      Result := pthread_setspecific (ATCB_Key, To_Address (Self_ID));
+      pragma Assert (Result = 0);
+
+      if Self_ID.Common.Task_Info /= null
+        and then Self_ID.Common.Task_Info.Scope = PTHREAD_SCOPE_SYSTEM
+        and then Self_ID.Common.Task_Info.Runon_CPU /= ANY_CPU
+      then
+         Result := pthread_setrunon_np
+           (To_Int (Self_ID.Common.Task_Info.Runon_CPU));
+         pragma Assert (Result = 0);
+      end if;
+
+      Lock_All_Tasks_List;
+
+      for J in Known_Tasks'Range loop
+         if Known_Tasks (J) = null then
+            Known_Tasks (J) := Self_ID;
+            Self_ID.Known_Tasks_Index := J;
+            exit;
+         end if;
+      end loop;
+
+      Unlock_All_Tasks_List;
+   end Enter_Task;
+
+   --------------
+   -- New_ATCB --
+   --------------
+
+   function New_ATCB (Entry_Num : Task_Entry_Index) return Task_ID is
+   begin
+      return new Ada_Task_Control_Block (Entry_Num);
+   end New_ATCB;
+
+   --------------------
+   -- Initialize_TCB --
+   --------------------
+
+   procedure Initialize_TCB (Self_ID : Task_ID; Succeeded : out Boolean) is
+      Result    : Interfaces.C.int;
+      Cond_Attr : aliased pthread_condattr_t;
+
+   begin
+      Initialize_Lock (Self_ID.Common.LL.L'Access, All_Tasks_Level);
+
+      Result := pthread_condattr_init (Cond_Attr'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result /= 0 then
+         Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
+         pragma Assert (Result = 0);
+
+         Succeeded := False;
+         return;
+      end if;
+
+      Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
+        Cond_Attr'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result = 0 then
+         Succeeded := True;
+      else
+         Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
+         pragma Assert (Result = 0);
+         Succeeded := False;
+      end if;
+
+      Result := pthread_condattr_destroy (Cond_Attr'Access);
+      pragma Assert (Result = 0);
+   end Initialize_TCB;
+
+   -----------------
+   -- Create_Task --
+   -----------------
+
+   procedure Create_Task
+     (T          : Task_ID;
+      Wrapper    : System.Address;
+      Stack_Size : System.Parameters.Size_Type;
+      Priority   : System.Any_Priority;
+      Succeeded  : out Boolean)
+   is
+      use System.Task_Info;
+
+      Attributes          : aliased pthread_attr_t;
+      Sched_Param         : aliased struct_sched_param;
+      Adjusted_Stack_Size : Interfaces.C.size_t;
+      Result              : Interfaces.C.int;
+
+      function Thread_Body_Access is new
+        Unchecked_Conversion (System.Address, Thread_Body);
+
+      function To_Int is new Unchecked_Conversion
+        (System.Task_Info.Thread_Scheduling_Scope, Interfaces.C.int);
+      function To_Int is new Unchecked_Conversion
+        (System.Task_Info.Thread_Scheduling_Inheritance, Interfaces.C.int);
+      function To_Int is new Unchecked_Conversion
+        (System.Task_Info.Thread_Scheduling_Policy, Interfaces.C.int);
+
+   begin
+      if Stack_Size = System.Parameters.Unspecified_Size then
+         Adjusted_Stack_Size :=
+           Interfaces.C.size_t (System.Program_Info.Default_Task_Stack);
+
+      elsif Stack_Size < Size_Type (Minimum_Stack_Size) then
+         Adjusted_Stack_Size :=
+           Interfaces.C.size_t (Minimum_Stack_Size);
+
+      else
+         Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
+      end if;
+
+      Result := pthread_attr_init (Attributes'Access);
+      pragma Assert (Result = 0 or else Result = ENOMEM);
+
+      if Result /= 0 then
+         Succeeded := False;
+         return;
+      end if;
+
+      Result := pthread_attr_setdetachstate
+        (Attributes'Access, PTHREAD_CREATE_DETACHED);
+      pragma Assert (Result = 0);
+
+      Result := pthread_attr_setstacksize
+        (Attributes'Access, Interfaces.C.size_t (Adjusted_Stack_Size));
+      pragma Assert (Result = 0);
+
+      if T.Common.Task_Info /= null then
+         Result := pthread_attr_setscope
+           (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
+         pragma Assert (Result = 0);
+
+         Result := pthread_attr_setinheritsched
+           (Attributes'Access, To_Int (T.Common.Task_Info.Inheritance));
+         pragma Assert (Result = 0);
+
+         Result := pthread_attr_setschedpolicy
+           (Attributes'Access, To_Int (T.Common.Task_Info.Policy));
+         pragma Assert (Result = 0);
+
+         Sched_Param.sched_priority :=
+           Interfaces.C.int (T.Common.Task_Info.Priority);
+
+         Result := pthread_attr_setschedparam
+           (Attributes'Access, Sched_Param'Access);
+         pragma Assert (Result = 0);
+      end if;
+
+      --  Since the initial signal mask of a thread is inherited from the
+      --  creator, and the Environment task has all its signals masked, we
+      --  do not need to manipulate caller's signal mask at this point.
+      --  All tasks in RTS will have All_Tasks_Mask initially.
+
+      Result := pthread_create
+        (T.Common.LL.Thread'Access,
+         Attributes'Access,
+         Thread_Body_Access (Wrapper),
+         To_Address (T));
+
+      if Result /= 0
+        and then T.Common.Task_Info /= null
+        and then T.Common.Task_Info.Scope = PTHREAD_SCOPE_SYSTEM
+      then
+         --  The pthread_create call may have failed because we
+         --  asked for a system scope pthread and none were
+         --  available (probably because the program was not executed
+         --  by the superuser). Let's try for a process scope pthread
+         --  instead of raising Tasking_Error.
+
+         System.IO.Put_Line
+           ("Request for PTHREAD_SCOPE_SYSTEM in Task_Info pragma for task");
+         System.IO.Put ("""");
+         System.IO.Put (T.Common.Task_Image.all);
+         System.IO.Put_Line (""" could not be honored. ");
+         System.IO.Put_Line ("Scope changed to PTHREAD_SCOPE_PROCESS");
+
+         T.Common.Task_Info.Scope := PTHREAD_SCOPE_PROCESS;
+         Result := pthread_attr_setscope
+           (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
+         pragma Assert (Result = 0);
+
+         Result := pthread_create
+           (T.Common.LL.Thread'Access,
+            Attributes'Access,
+            Thread_Body_Access (Wrapper),
+            To_Address (T));
+      end if;
+
+      pragma Assert (Result = 0 or else Result = EAGAIN);
+
+      Succeeded := Result = 0;
+
+      Set_Priority (T, Priority);
+
+      Result := pthread_attr_destroy (Attributes'Access);
+      pragma Assert (Result = 0);
+   end Create_Task;
+
+   ------------------
+   -- Finalize_TCB --
+   ------------------
+
+   procedure Finalize_TCB (T : Task_ID) is
+      Result : Interfaces.C.int;
+      Tmp    : Task_ID := T;
+
+      procedure Free is new
+        Unchecked_Deallocation (Ada_Task_Control_Block, Task_ID);
+
+   begin
+      Result := pthread_mutex_destroy (T.Common.LL.L'Access);
+      pragma Assert (Result = 0);
+
+      Result := pthread_cond_destroy (T.Common.LL.CV'Access);
+      pragma Assert (Result = 0);
+
+      if T.Known_Tasks_Index /= -1 then
+         Known_Tasks (T.Known_Tasks_Index) := null;
+      end if;
+
+      Free (Tmp);
+   end Finalize_TCB;
+
+   ---------------
+   -- Exit_Task --
+   ---------------
+
+   procedure Exit_Task is
+   begin
+      pthread_exit (System.Null_Address);
+   end Exit_Task;
+
+   ----------------
+   -- Abort_Task --
+   ----------------
+
+   procedure Abort_Task (T : Task_ID) is
+      Result : Interfaces.C.int;
+   begin
+      Result := pthread_kill (T.Common.LL.Thread,
+        Signal (System.Interrupt_Management.Abort_Task_Interrupt));
+      pragma Assert (Result = 0);
+   end Abort_Task;
+
+   ----------------
+   -- Check_Exit --
+   ----------------
+
+   --  Dummy versions. The only currently working versions is for solaris
+   --  (native).
+
+   function Check_Exit (Self_ID : ST.Task_ID) return Boolean is
+   begin
+      return True;
+   end Check_Exit;
+
+   --------------------
+   -- Check_No_Locks --
+   --------------------
+
+   function Check_No_Locks (Self_ID : ST.Task_ID) return Boolean is
+   begin
+      return True;
+   end Check_No_Locks;
+
+   ----------------------
+   -- Environment_Task --
+   ----------------------
+
+   function Environment_Task return Task_ID is
+   begin
+      return Environment_Task_ID;
+   end Environment_Task;
+
+   -------------------------
+   -- Lock_All_Tasks_List --
+   -------------------------
+
+   procedure Lock_All_Tasks_List is
+   begin
+      Write_Lock (All_Tasks_L'Access);
+   end Lock_All_Tasks_List;
+
+   ---------------------------
+   -- Unlock_All_Tasks_List --
+   ---------------------------
+
+   procedure Unlock_All_Tasks_List is
+   begin
+      Unlock (All_Tasks_L'Access);
+   end Unlock_All_Tasks_List;
+
+   ------------------
+   -- Suspend_Task --
+   ------------------
+
+   function Suspend_Task
+     (T           : ST.Task_ID;
+      Thread_Self : Thread_Id) return Boolean is
+   begin
+      return False;
+   end Suspend_Task;
+
+   -----------------
+   -- Resume_Task --
+   -----------------
+
+   function Resume_Task
+     (T           : ST.Task_ID;
+      Thread_Self : Thread_Id) return Boolean is
+   begin
+      return False;
+   end Resume_Task;
+
+   ----------------
+   -- Initialize --
+   ----------------
+
+   procedure Initialize (Environment_Task : Task_ID) is
+      act     : aliased struct_sigaction;
+      old_act : aliased struct_sigaction;
+      Tmp_Set : aliased sigset_t;
+      Result  : Interfaces.C.int;
+
+   begin
+      Environment_Task_ID := Environment_Task;
+
+      --  Initialize the lock used to synchronize chain of all ATCBs.
+      Initialize_Lock (All_Tasks_L'Access, All_Tasks_Level);
+
+      Enter_Task (Environment_Task);
+
+      --  Install the abort-signal handler
+
+      act.sa_flags := 0;
+      act.sa_handler := Abort_Handler'Address;
+
+      Result := sigemptyset (Tmp_Set'Access);
+      pragma Assert (Result = 0);
+      act.sa_mask := Tmp_Set;
+
+      Result :=
+        sigaction (
+          Signal (System.Interrupt_Management.Abort_Task_Interrupt),
+          act'Unchecked_Access,
+          old_act'Unchecked_Access);
+      pragma Assert (Result = 0);
+   end Initialize;
+
+begin
+   declare
+      Result : Interfaces.C.int;
+   begin
+      --  Mask Environment task for all signals. The original mask of the
+      --  Environment task will be recovered by Interrupt_Server task
+      --  during the elaboration of s-interr.adb.
+
+      System.Interrupt_Management.Operations.Set_Interrupt_Mask
+        (System.Interrupt_Management.Operations.All_Tasks_Mask'Access);
+
+      --  Prepare the set of signals that should unblocked in all tasks
+
+      Result := sigemptyset (Unblocked_Signal_Mask'Access);
+      pragma Assert (Result = 0);
+
+      for J in Interrupt_Management.Interrupt_ID loop
+         if System.Interrupt_Management.Keep_Unmasked (J) then
+            Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
+            pragma Assert (Result = 0);
+         end if;
+      end loop;
+
+      Result := pthread_key_create (ATCB_Key'Access, null);
+      pragma Assert (Result = 0);
+
+      --  Pick the highest resolution Clock for Clock_Realtime
+      --  ??? This code currently doesn't work (see c94007[ab] for example)
+      --
+      --  if syssgi (SGI_CYCLECNTR_SIZE) = 64 then
+      --     Real_Time_Clock_Id := CLOCK_SGI_CYCLE;
+      --  else
+      --     Real_Time_Clock_Id := CLOCK_REALTIME;
+      --  end if;
+   end;
+end System.Task_Primitives.Operations;