diff options
Diffstat (limited to 'gcc/ada/s-tasuti.ads')
| -rw-r--r-- | gcc/ada/s-tasuti.ads | 43 |
1 files changed, 23 insertions, 20 deletions
diff --git a/gcc/ada/s-tasuti.ads b/gcc/ada/s-tasuti.ads index 6d605bc394a..6fc816c7afe 100644 --- a/gcc/ada/s-tasuti.ads +++ b/gcc/ada/s-tasuti.ads @@ -6,9 +6,9 @@ -- -- -- S p e c -- -- -- --- $Revision: 1.34 $ -- +-- $Revision$ -- -- -- --- Copyright (C) 1991-1998 Florida State University -- +-- Copyright (C) 1992-2002, 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- -- @@ -29,8 +29,7 @@ -- 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). -- -- -- ------------------------------------------------------------------------------ @@ -49,18 +48,24 @@ package System.Tasking.Utilities is --------------------------------- procedure Make_Independent; - -- Move the current task to the outermost level (level 1) of the master - -- master hierarchy of the environment task. This is one level further - -- out than normal tasks defined in library-level packages (level 2). - -- The environment task will wait for level 2 tasks to terminate normally, - -- then it will abort all the level 1 tasks. See Finalize_Global_Tasks + -- Move the current task to the outermost level (level 2) of the master + -- hierarchy of the environment task. That is one level further out + -- than normal tasks defined in library-level packages (level 3). The + -- environment task will wait for level 3 tasks to terminate normally, + -- then it will abort all the level 2 tasks. See Finalize_Global_Tasks -- procedure for more information. -- -- This is a dangerous operation, and should only be used on nested tasks -- or tasks that depend on any objects that might be finalized earlier than - -- the termination of the environment task. It is for internal use by - -- GNARL, to prevent such internal server tasks from preventing a - -- partition from terminating. + -- the termination of the environment task. It is for internal use by the + -- GNARL, to prevent such internal server tasks from preventing a partition + -- from terminating. + -- + -- Also note that the run time assumes that the parent of an independent + -- task is the environment task. If this is not the case, Make_Independent + -- will change the task's parent. This assumption is particularly + -- important for master level completion and for the computation of + -- Independent_Task_Count. Independent_Task_Count : Natural := 0; -- Number of independent task. This counter is incremented each time @@ -75,7 +80,7 @@ package System.Tasking.Utilities is procedure Cancel_Queued_Entry_Calls (T : Task_ID); -- Cancel any entry calls queued on target task. - -- Do not call this while holding any locks. + -- Call this while holding T's lock (or RTS_Lock in Single_Lock mode). procedure Exit_One_ATC_Level (Self_ID : Task_ID); pragma Inline (Exit_One_ATC_Level); @@ -83,9 +88,7 @@ package System.Tasking.Utilities is -- This is a bit of common code for all entry calls. -- The effect is to exit one level of ATC nesting. - procedure Abort_One_Task - (Self_ID : Task_ID; - T : Task_ID); + procedure Abort_One_Task (Self_ID : Task_ID; T : Task_ID); -- Similar to Locked_Abort_To_Level (Self_ID, T, 0), but: -- (1) caller should be holding no locks -- (2) may be called for tasks that have not yet been activated @@ -95,10 +98,10 @@ package System.Tasking.Utilities is -- Abort_Tasks is called to initiate abortion, however, the actual -- abortion is done by abortee by means of Abort_Handler - procedure Make_Passive - (Self_ID : Task_ID; - Task_Completed : Boolean); + procedure Make_Passive (Self_ID : Task_ID; Task_Completed : Boolean); -- Update counts to indicate current task is either terminated - -- or accepting on a terminate alternative. Call holding no locks. + -- or accepting on a terminate alternative. + -- Call holding no locks except Global_Task_Lock when calling from + -- Terminate_Task, and RTS_Lock when Single_Lock is True. end System.Tasking.Utilities; |