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Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-taenca.ads')
| -rw-r--r-- | gcc-4.2.1/gcc/ada/s-taenca.ads | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/ada/s-taenca.ads b/gcc-4.2.1/gcc/ada/s-taenca.ads new file mode 100644 index 000000000..1b88b16dc --- /dev/null +++ b/gcc-4.2.1/gcc/ada/s-taenca.ads @@ -0,0 +1,99 @@ +------------------------------------------------------------------------------ +-- -- +-- 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 -- +-- -- +-- 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- -- +-- 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, 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, -- +-- 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. -- +-- 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 (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 (= Entry_Call.Self) or global RTS lock. + + procedure Wait_For_Completion_With_Timeout + (Entry_Call : Entry_Call_Link; + Wakeup_Time : Duration; + 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. + -- 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); + -- This procedure suspends the calling task until the specified entry + -- call is queued abortably or completes. + -- 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); + -- Try to cancel async. entry call. + -- Effect includes Abort_To_Level and Wait_For_Completion. + -- Cancelled = True iff the cancelation was successful, i.e., + -- the call was not Done before this call. + -- On return, the call is off-queue and the ATC level is reduced by one. + + procedure Reset_Priority + (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; + 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). + -- Absolutely, the caller should not be holding any locks, or there + -- will be deadlock. + +end System.Tasking.Entry_Calls; |