------------------------------------------------------------------------------
-- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . T A S K I N G . E N T R Y _ C A L L S --
-- --
-- S p e c --
-- --
--- $Revision: 1.12 $ --
--- --
--- Copyright (C) 1991-1998, Florida State University --
+-- Copyright (C) 1992-2005, 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- --
-- 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. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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, --
-- 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). --
+-- GNARL was developed by the GNARL team at Florida State University. --
+-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
+-- This package provides internal RTS calls implementing operations
+-- that apply to general entry calls, that is, calls to either
+-- protected or task entries.
+
+-- These declarations are not part of the GNARL Interface
+
package System.Tasking.Entry_Calls is
- procedure Wait_For_Completion
- (Self_ID : Task_ID;
- Entry_Call : Entry_Call_Link);
+ procedure Wait_For_Completion (Entry_Call : Entry_Call_Link);
-- This procedure suspends the calling task until the specified entry
-- call has either been completed or cancelled. It performs other
-- operations required of suspended tasks, such as performing
-- dynamic priority changes. On exit, the call will not be queued.
-- This waits for calls on task or protected entries.
-- Abortion must be deferred when calling this procedure.
- -- Call this only when holding Self_ID locked.
+ -- Call this only when holding Self (= Entry_Call.Self) or global RTS lock.
procedure Wait_For_Completion_With_Timeout
- (Self_ID : Task_ID;
- Entry_Call : Entry_Call_Link;
+ (Entry_Call : Entry_Call_Link;
Wakeup_Time : Duration;
- Mode : Delay_Modes);
- -- Same as Wait_For_Completion but it wait for a timeout with the value
+ Mode : Delay_Modes;
+ Yielded : out Boolean);
+ -- Same as Wait_For_Completion but wait for a timeout with the value
-- specified in Wakeup_Time as well.
- -- Self_ID will be locked by this procedure.
+ -- On return, Yielded indicates whether the wait has performed a yield.
+ -- Check_Exception must be called after calling this procedure.
procedure Wait_Until_Abortable
- (Self_ID : Task_ID;
- Call : Entry_Call_Link);
+ (Self_ID : Task_Id;
+ Call : Entry_Call_Link);
-- This procedure suspends the calling task until the specified entry
-- call is queued abortably or completes.
- -- Abortion must be deferred when calling this procedure.
+ -- Abortion must be deferred when calling this procedure, and the global
+ -- RTS lock taken when Single_Lock.
procedure Try_To_Cancel_Entry_Call (Succeeded : out Boolean);
pragma Inline (Try_To_Cancel_Entry_Call);
-- On return, the call is off-queue and the ATC level is reduced by one.
procedure Reset_Priority
- (Acceptor_Prev_Priority : Rendezvous_Priority;
- Acceptor : Task_ID);
+ (Acceptor : Task_Id;
+ Acceptor_Prev_Priority : Rendezvous_Priority);
pragma Inline (Reset_Priority);
-- Reset the priority of a task completing an accept statement to
-- the value it had before the call.
+ -- Acceptor should always be equal to Self.
procedure Check_Exception
- (Self_ID : Task_ID;
+ (Self_ID : Task_Id;
Entry_Call : Entry_Call_Link);
pragma Inline (Check_Exception);
-- Raise any pending exception from the Entry_Call.
- -- This should be called at the end of every compiler interface
- -- procedure that implements an entry call.
- -- In principle, the caller should not be abort-deferred (unless
- -- the application program violates the Ada language rules by doing
- -- entry calls from within protected operations -- an erroneous practice
- -- apparently followed with success by some adventurous GNAT users).
+ -- This should be called at the end of every compiler interface procedure
+ -- that implements an entry call.
+ -- In principle, the caller should not be abort-deferred (unless the
+ -- application program violates the Ada language rules by doing entry calls
+ -- from within protected operations -- an erroneous practice apparently
+ -- followed with success by some adventurous GNAT users).
-- Absolutely, the caller should not be holding any locks, or there
-- will be deadlock.
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