diff options
Diffstat (limited to 'gcc/ada/s-taspri-os2.ads')
| -rw-r--r-- | gcc/ada/s-taspri-os2.ads | 56 |
1 files changed, 37 insertions, 19 deletions
diff --git a/gcc/ada/s-taspri-os2.ads b/gcc/ada/s-taspri-os2.ads index cb5b0295b13..e434ac53802 100644 --- a/gcc/ada/s-taspri-os2.ads +++ b/gcc/ada/s-taspri-os2.ads @@ -1,13 +1,13 @@ ------------------------------------------------------------------------------ -- -- --- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- S Y S T E M . T A S K _ P R I M I T I V E S -- -- -- -- S p e c -- -- -- -- Copyright (C) 1991-1994, Florida State University -- --- Copyright (C) 1995-2003, Ada Core Technologies -- +-- Copyright (C) 1995-2005, AdaCore -- -- -- -- 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- -- @@ -32,9 +32,9 @@ -- -- ------------------------------------------------------------------------------ --- This is an OS/2 version of this package. +-- This is an OS/2 version of this package --- This package provides low-level support for most tasking features. +-- This package provides low-level support for most tasking features pragma Polling (Off); -- Turn off polling, we do not want ATC polling to take place during @@ -47,6 +47,8 @@ package System.Task_Primitives is pragma Preelaborate; + -- Why are these commented out ??? + -- type Lock is limited private; -- Should be used for implementation of protected objects. @@ -65,7 +67,7 @@ package System.Task_Primitives is -- basis. A component of this type is guaranteed to be included -- in the Ada_Task_Control_Block. --- private +-- private (why commented out???) type Lock is record Mutex : aliased Interfaces.OS2Lib.Synchronization.HMTX; @@ -76,14 +78,31 @@ package System.Task_Primitives is type RTS_Lock is new Lock; + type Suspension_Object is record + State : Boolean; + pragma Atomic (State); + -- Boolean that indicates whether the object is open. This field is + -- marked Atomic to ensure that we can read its value without locking + -- the access to the Suspension_Object. + + Waiting : Boolean; + -- Flag showing if there is a task already suspended on this object + + L : aliased Interfaces.OS2Lib.Synchronization.HMTX; + -- Protection for ensuring mutual exclusion on the Suspension_Object + + CV : aliased Interfaces.OS2Lib.Synchronization.HEV; + -- Condition variable used to queue threads until condition is signaled + end record; + type Private_Data is record - Thread : aliased Interfaces.OS2Lib.Threads.TID; + Thread : aliased Interfaces.OS2Lib.Threads.TID; pragma Atomic (Thread); -- Thread field may be updated by two different threads of control. - -- (See, Enter_Task and Create_Task in s-taprop.adb). - -- They put the same value (thr_self value). We do not want to - -- use lock on those operations and the only thing we have to - -- make sure is that they are updated in atomic fashion. + -- (See, Enter_Task and Create_Task in s-taprop.adb). They put the same + -- value (thr_self value). We do not want to use lock on those + -- operations and the only thing we have to make sure is that they are + -- updated in atomic fashion. CV : aliased Interfaces.OS2Lib.Synchronization.HEV; @@ -91,17 +110,16 @@ package System.Task_Primitives is -- Protection for all components is lock L Current_Priority : Integer := -1; - -- The Current_Priority is the actual priority of a thread. - -- This field is needed because it is only possible to set a - -- delta priority in OS/2. The only places where this field should - -- be set are Set_Priority, Create_Task and Initialize (Environment). + -- The Current_Priority is the actual priority of a thread. This field + -- is needed because it is only possible to set delta priority in OS/2. + -- The only places where this field should be set are Set_Priority, + -- Create_Task and Initialize (Environment). Wrapper : Interfaces.OS2Lib.Threads.PFNTHREAD; - -- This is the original wrapper passed by Operations.Create_Task. - -- When installing an exception handler in a thread, the thread - -- starts executing the Exception_Wrapper which calls Wrapper - -- when the handler has been installed. The handler is removed when - -- wrapper returns. + -- This is the original wrapper passed by Operations.Create_Task. When + -- installing an exception handler in a thread, the thread starts + -- executing the Exception_Wrapper which calls Wrapper when the handler + -- has been installed. The handler is removed when wrapper returns. end record; end System.Task_Primitives; |