New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45957 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 150 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
+--                                                                          --
+--             S Y S T E M . T A S K I N G . R E N D E Z V O U S            --
+--                                                                          --
+--                                  S p e c                                 --
+--                                                                          --
+--                             $Revision: 1.26 $                            --
+--                                                                          --
+--          Copyright (C) 1992-1998, Free Software Foundation, Inc.         --
+--                                                                          --
+-- 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).                                  --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  Note: the compiler generates direct calls to this interface, via Rtsfind.
+--  Any changes to this interface may require corresponding compiler changes.
+
+with Ada.Exceptions;
+--  Used for, Exception_Id
+
+with System.Tasking.Protected_Objects.Entries;
+--  used for Protection_Entries
+
+package System.Tasking.Rendezvous is
+   --  This interface is described in the document
+   --  Gnu Ada Runtime Library Interface (GNARLI).
+
+   package STPE renames System.Tasking.Protected_Objects.Entries;
+
+   procedure Task_Entry_Call
+     (Acceptor              : Task_ID;
+      E                     : Task_Entry_Index;
+      Uninterpreted_Data    : System.Address;
+      Mode                  : Call_Modes;
+      Rendezvous_Successful : out Boolean);
+   --  General entry call
+
+   procedure Timed_Task_Entry_Call
+     (Acceptor              : Task_ID;
+      E                     : Task_Entry_Index;
+      Uninterpreted_Data    : System.Address;
+      Timeout               : Duration;
+      Mode                  : Delay_Modes;
+      Rendezvous_Successful : out Boolean);
+   --  Timed entry call without using ATC.
+
+   procedure Call_Simple
+     (Acceptor           : Task_ID;
+      E                  : Task_Entry_Index;
+      Uninterpreted_Data : System.Address);
+   --  Simple entry call
+
+   procedure Cancel_Task_Entry_Call (Cancelled : out Boolean);
+   --  Cancel pending task entry call
+
+   procedure Requeue_Task_Entry
+     (Acceptor   : Task_ID;
+      E          : Task_Entry_Index;
+      With_Abort : Boolean);
+
+   procedure Requeue_Protected_To_Task_Entry
+     (Object     : STPE.Protection_Entries_Access;
+      Acceptor   : Task_ID;
+      E          : Task_Entry_Index;
+      With_Abort : Boolean);
+
+   procedure Selective_Wait
+     (Open_Accepts       : Accept_List_Access;
+      Select_Mode        : Select_Modes;
+      Uninterpreted_Data : out System.Address;
+      Index              : out Select_Index);
+   --  Selective wait
+
+   procedure Timed_Selective_Wait
+     (Open_Accepts       : Accept_List_Access;
+      Select_Mode        : Select_Modes;
+      Uninterpreted_Data : out System.Address;
+      Timeout            : Duration;
+      Mode               : Delay_Modes;
+      Index              : out Select_Index);
+   --  Selective wait with timeout without using ATC.
+
+   procedure Accept_Call
+     (E                  : Task_Entry_Index;
+      Uninterpreted_Data : out System.Address);
+   --  Accept an entry call
+
+   procedure Accept_Trivial (E : Task_Entry_Index);
+   --  Accept an entry call that has no parameters and no body
+
+   function Task_Count (E : Task_Entry_Index) return Natural;
+   --  Return number of tasks waiting on the entry E (of current task)
+
+   function Callable (T : Task_ID) return Boolean;
+   --  Return T'CALLABLE
+
+   type Task_Entry_Nesting_Depth is new Task_Entry_Index
+     range 0 .. Max_Task_Entry;
+
+   function Task_Entry_Caller (D : Task_Entry_Nesting_Depth) return Task_ID;
+   --  Return E'Caller.  This will only work if called from within an
+   --  accept statement that is handling E, as required by the
+   --  LRM (C.7.1(14)).
+
+   procedure Complete_Rendezvous;
+   --  Called by acceptor to wake up caller
+
+   procedure Exceptional_Complete_Rendezvous
+     (Ex : Ada.Exceptions.Exception_Id);
+   --  Called by acceptor to mark the end of the current rendezvous and
+   --  propagate an exception to the caller.
+
+   --  For internal use only:
+
+   function Task_Do_Or_Queue
+     (Self_ID    : Task_ID;
+      Entry_Call : Entry_Call_Link;
+      With_Abort : Boolean) return Boolean;
+   --  Call this only with abort deferred and holding lock of Acceptor.
+   --  Returns False iff the call cannot be served or queued, as is the
+   --  case if the caller is not callable; i.e., a False return value
+   --  indicates that Tasking_Error should be raised.
+   --  Either initiate the entry call, such that the accepting task is
+   --  free to execute the rendezvous, queue the call on the acceptor's
+   --  queue, or cancel the call.  Conditional calls that cannot be
+   --  accepted immediately are cancelled.
+
+end System.Tasking.Rendezvous;