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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
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--                                                                          --
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--             S Y S T E M . T A S K I N G . E N T R Y _ C A L L S          --
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--                                                                          --
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--                                  S p e c                                 --
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--                                                                          --
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--         Copyright (C) 1992-2009, Free Software Foundation, Inc.          --
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--                                                                          --
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-- GNARL is free software; you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNARL was developed by the GNARL team at Florida State University.       --
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-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package provides internal RTS calls implementing operations
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--  that apply to general entry calls, that is, calls to either
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--  protected or task entries.
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--  These declarations are not part of the GNARL Interface
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package System.Tasking.Entry_Calls is
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   procedure Wait_For_Completion (Entry_Call : Entry_Call_Link);
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   --  This procedure suspends the calling task until the specified entry
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   --  call has either been completed or cancelled. It performs other
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   --  operations required of suspended tasks, such as performing
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   --  dynamic priority changes. On exit, the call will not be queued.
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   --  This waits for calls on task or protected entries.
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   --  Abortion must be deferred when calling this procedure.
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   --  Call this only when holding Self (= Entry_Call.Self) or global RTS lock.
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   procedure Wait_For_Completion_With_Timeout
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     (Entry_Call  : Entry_Call_Link;
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      Wakeup_Time : Duration;
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      Mode        : Delay_Modes;
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      Yielded     : out Boolean);
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   --  Same as Wait_For_Completion but wait for a timeout with the value
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   --  specified in Wakeup_Time as well.
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   --  On return, Yielded indicates whether the wait has performed a yield.
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   --  Check_Exception must be called after calling this procedure.
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   procedure Wait_Until_Abortable
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     (Self_ID : Task_Id;
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      Call    : Entry_Call_Link);
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   --  This procedure suspends the calling task until the specified entry
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   --  call is queued abortably or completes.
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   --  Abortion must be deferred when calling this procedure, and the global
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   --  RTS lock taken when Single_Lock.
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   procedure Try_To_Cancel_Entry_Call (Succeeded : out Boolean);
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   pragma Inline (Try_To_Cancel_Entry_Call);
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   --  Try to cancel async. entry call.
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   --  Effect includes Abort_To_Level and Wait_For_Completion.
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   --  Cancelled = True iff the cancellation was successful, i.e.,
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   --  the call was not Done before this call.
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   --  On return, the call is off-queue and the ATC level is reduced by one.
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   procedure Reset_Priority
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     (Acceptor               : Task_Id;
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      Acceptor_Prev_Priority : Rendezvous_Priority);
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   pragma Inline (Reset_Priority);
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   --  Reset the priority of a task completing an accept statement to
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   --  the value it had before the call.
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   --  Acceptor should always be equal to Self.
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   procedure Check_Exception
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     (Self_ID    : Task_Id;
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      Entry_Call : Entry_Call_Link);
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   pragma Inline (Check_Exception);
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   --  Raise any pending exception from the Entry_Call.
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   --  This should be called at the end of every compiler interface procedure
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   --  that implements an entry call.
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   --  In principle, the caller should not be abort-deferred (unless the
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   --  application program violates the Ada language rules by doing entry calls
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   --  from within protected operations -- an erroneous practice apparently
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   --  followed with success by some adventurous GNAT users).
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   --  Absolutely, the caller should not be holding any locks, or there
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   --  will be deadlock.
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end System.Tasking.Entry_Calls;

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