diff options
Diffstat (limited to 'gcc/ada/s-taenca.ads')
| -rw-r--r-- | gcc/ada/s-taenca.ads | 54 |
1 files changed, 30 insertions, 24 deletions
diff --git a/gcc/ada/s-taenca.ads b/gcc/ada/s-taenca.ads index e28ff7a3e76..d272479038c 100644 --- a/gcc/ada/s-taenca.ads +++ b/gcc/ada/s-taenca.ads @@ -6,9 +6,9 @@ -- -- -- S p e c -- -- -- --- $Revision: 1.12 $ -- +-- $Revision$ -- -- --- Copyright (C) 1991-1998, Florida State University -- +-- Copyright (C) 1992-2001, 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- -- @@ -29,39 +29,44 @@ -- 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). -- +-- now maintained by Ada Core Technologies, Inc. (http://www.gnat.com). -- -- -- ------------------------------------------------------------------------------ +-- 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); + 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); @@ -72,23 +77,24 @@ package System.Tasking.Entry_Calls is -- 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. |