1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S --
9 -- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
11 -- GNARL is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is a NT (native) version of this package
36 -- This package contains all the GNULL primitives that interface directly
37 -- with the underlying OS.
40 -- Turn off polling, we do not want ATC polling to take place during
41 -- tasking operations. It causes infinite loops and other problems.
43 with System.Tasking.Debug;
44 -- used for Known_Tasks
46 with System.OS_Primitives;
47 -- used for Delay_Modes
53 with Interfaces.C.Strings;
56 with System.OS_Interface;
57 -- used for various type, constant, and operations
59 with System.Parameters;
62 with System.Task_Info;
63 -- used for Unspecified_Task_Info
65 with Unchecked_Deallocation;
67 package body System.Task_Primitives.Operations is
69 use System.Tasking.Debug;
72 use Interfaces.C.Strings;
73 use System.OS_Interface;
74 use System.Parameters;
75 use System.OS_Primitives;
77 pragma Link_With ("-Xlinker --stack=0x800000,0x1000");
78 -- Change the stack size (8 MB) for tasking programs on Windows. This
79 -- permit to have more than 30 tasks running at the same time. Note that
80 -- we set the stack size for non tasking programs on System unit.
86 Environment_Task_Id : Task_Id;
87 -- A variable to hold Task_Id for the environment task
89 Single_RTS_Lock : aliased RTS_Lock;
90 -- This is a lock to allow only one thread of control in the RTS at
91 -- a time; it is used to execute in mutual exclusion from all other tasks.
92 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
94 Time_Slice_Val : Integer;
95 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
97 Dispatching_Policy : Character;
98 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
100 Foreign_Task_Elaborated : aliased Boolean := True;
101 -- Used to identified fake tasks (i.e., non-Ada Threads)
103 ------------------------------------
104 -- The thread local storage index --
105 ------------------------------------
108 pragma Export (Ada, TlsIndex);
109 -- To ensure that this variable won't be local to this package, since
110 -- in some cases, inlining forces this variable to be global anyway.
118 function Is_Valid_Task return Boolean;
119 pragma Inline (Is_Valid_Task);
120 -- Does executing thread have a TCB?
122 procedure Set (Self_Id : Task_Id);
124 -- Set the self id for the current task.
128 package body Specific is
130 function Is_Valid_Task return Boolean is
132 return TlsGetValue (TlsIndex) /= System.Null_Address;
135 procedure Set (Self_Id : Task_Id) is
138 Succeeded := TlsSetValue (TlsIndex, To_Address (Self_Id));
139 pragma Assert (Succeeded = True);
144 ---------------------------------
145 -- Support for foreign threads --
146 ---------------------------------
148 function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
149 -- Allocate and Initialize a new ATCB for the current Thread.
151 function Register_Foreign_Thread
152 (Thread : Thread_Id) return Task_Id is separate;
154 ----------------------------------
155 -- Condition Variable Functions --
156 ----------------------------------
158 procedure Initialize_Cond (Cond : access Condition_Variable);
159 -- Initialize given condition variable Cond
161 procedure Finalize_Cond (Cond : access Condition_Variable);
162 -- Finalize given condition variable Cond.
164 procedure Cond_Signal (Cond : access Condition_Variable);
165 -- Signal condition variable Cond
168 (Cond : access Condition_Variable;
169 L : access RTS_Lock);
170 -- Wait on conditional variable Cond, using lock L
172 procedure Cond_Timed_Wait
173 (Cond : access Condition_Variable;
176 Timed_Out : out Boolean;
177 Status : out Integer);
178 -- Do timed wait on condition variable Cond using lock L. The duration
179 -- of the timed wait is given by Rel_Time. When the condition is
180 -- signalled, Timed_Out shows whether or not a time out occurred.
181 -- Status is only valid if Timed_Out is False, in which case it
182 -- shows whether Cond_Timed_Wait completed successfully.
184 ---------------------
185 -- Initialize_Cond --
186 ---------------------
188 procedure Initialize_Cond (Cond : access Condition_Variable) is
192 hEvent := CreateEvent (null, True, False, Null_Ptr);
193 pragma Assert (hEvent /= 0);
194 Cond.all := Condition_Variable (hEvent);
201 -- No such problem here, DosCloseEventSem has been derived.
202 -- What does such refer to in above comment???
204 procedure Finalize_Cond (Cond : access Condition_Variable) is
207 Result := CloseHandle (HANDLE (Cond.all));
208 pragma Assert (Result = True);
215 procedure Cond_Signal (Cond : access Condition_Variable) is
218 Result := SetEvent (HANDLE (Cond.all));
219 pragma Assert (Result = True);
226 -- Pre-assertion: Cond is posted
229 -- Post-assertion: Cond is posted
233 (Cond : access Condition_Variable;
240 -- Must reset Cond BEFORE L is unlocked.
242 Result_Bool := ResetEvent (HANDLE (Cond.all));
243 pragma Assert (Result_Bool = True);
246 -- No problem if we are interrupted here: if the condition is signaled,
247 -- WaitForSingleObject will simply not block
249 Result := WaitForSingleObject (HANDLE (Cond.all), Wait_Infinite);
250 pragma Assert (Result = 0);
255 ---------------------
256 -- Cond_Timed_Wait --
257 ---------------------
259 -- Pre-assertion: Cond is posted
262 -- Post-assertion: Cond is posted
265 procedure Cond_Timed_Wait
266 (Cond : access Condition_Variable;
269 Timed_Out : out Boolean;
270 Status : out Integer)
272 Time_Out_Max : constant DWORD := 16#FFFF0000#;
273 -- NT 4 cannot handle timeout values that are too large,
274 -- e.g. DWORD'Last - 1
281 -- Must reset Cond BEFORE L is unlocked.
283 Result := ResetEvent (HANDLE (Cond.all));
284 pragma Assert (Result = True);
287 -- No problem if we are interrupted here: if the condition is signaled,
288 -- WaitForSingleObject will simply not block
290 if Rel_Time <= 0.0 then
295 if Rel_Time >= Duration (Time_Out_Max) / 1000 then
296 Time_Out := Time_Out_Max;
298 Time_Out := DWORD (Rel_Time * 1000);
301 Wait_Result := WaitForSingleObject (HANDLE (Cond.all), Time_Out);
303 if Wait_Result = WAIT_TIMEOUT then
313 -- Ensure post-condition
316 Result := SetEvent (HANDLE (Cond.all));
317 pragma Assert (Result = True);
320 Status := Integer (Wait_Result);
327 -- The underlying thread system sets a guard page at the
328 -- bottom of a thread stack, so nothing is needed.
329 -- ??? Check the comment above
331 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
332 pragma Warnings (Off, T);
333 pragma Warnings (Off, On);
343 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
345 return T.Common.LL.Thread;
352 function Self return Task_Id is
353 Self_Id : constant Task_Id := To_Task_Id (TlsGetValue (TlsIndex));
355 if Self_Id = null then
356 return Register_Foreign_Thread (GetCurrentThread);
362 ---------------------
363 -- Initialize_Lock --
364 ---------------------
366 -- Note: mutexes and cond_variables needed per-task basis are
367 -- initialized in Intialize_TCB and the Storage_Error is handled.
368 -- Other mutexes (such as RTS_Lock, Memory_Lock...) used in
369 -- the RTS is initialized before any status change of RTS.
370 -- Therefore raising Storage_Error in the following routines
371 -- should be able to be handled safely.
373 procedure Initialize_Lock
374 (Prio : System.Any_Priority;
378 InitializeCriticalSection (L.Mutex'Access);
379 L.Owner_Priority := 0;
383 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
384 pragma Unreferenced (Level);
386 InitializeCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
393 procedure Finalize_Lock (L : access Lock) is
395 DeleteCriticalSection (L.Mutex'Access);
398 procedure Finalize_Lock (L : access RTS_Lock) is
400 DeleteCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
407 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
409 L.Owner_Priority := Get_Priority (Self);
411 if L.Priority < L.Owner_Priority then
412 Ceiling_Violation := True;
416 EnterCriticalSection (L.Mutex'Access);
418 Ceiling_Violation := False;
422 (L : access RTS_Lock;
423 Global_Lock : Boolean := False)
426 if not Single_Lock or else Global_Lock then
427 EnterCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
431 procedure Write_Lock (T : Task_Id) is
433 if not Single_Lock then
435 (CRITICAL_SECTION (T.Common.LL.L)'Unrestricted_Access);
443 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
445 Write_Lock (L, Ceiling_Violation);
452 procedure Unlock (L : access Lock) is
454 LeaveCriticalSection (L.Mutex'Access);
457 procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
459 if not Single_Lock or else Global_Lock then
460 LeaveCriticalSection (CRITICAL_SECTION (L.all)'Unrestricted_Access);
464 procedure Unlock (T : Task_Id) is
466 if not Single_Lock then
468 (CRITICAL_SECTION (T.Common.LL.L)'Unrestricted_Access);
478 Reason : System.Tasking.Task_States)
480 pragma Unreferenced (Reason);
483 pragma Assert (Self_ID = Self);
486 Cond_Wait (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
488 Cond_Wait (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
491 if Self_ID.Deferral_Level = 0
492 and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
495 raise Standard'Abort_Signal;
503 -- This is for use within the run-time system, so abort is
504 -- assumed to be already deferred, and the caller should be
505 -- holding its own ATCB lock.
507 procedure Timed_Sleep
510 Mode : ST.Delay_Modes;
511 Reason : System.Tasking.Task_States;
512 Timedout : out Boolean;
513 Yielded : out Boolean)
515 pragma Unreferenced (Reason);
516 Check_Time : Duration := Monotonic_Clock;
521 Local_Timedout : Boolean;
527 if Mode = Relative then
529 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
531 Rel_Time := Time - Check_Time;
535 if Rel_Time > 0.0 then
537 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
538 or else Self_ID.Pending_Priority_Change;
541 Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
542 Single_RTS_Lock'Access, Rel_Time, Local_Timedout, Result);
544 Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
545 Self_ID.Common.LL.L'Access, Rel_Time, Local_Timedout, Result);
548 Check_Time := Monotonic_Clock;
549 exit when Abs_Time <= Check_Time;
551 if not Local_Timedout then
553 -- Somebody may have called Wakeup for us
559 Rel_Time := Abs_Time - Check_Time;
568 procedure Timed_Delay
571 Mode : ST.Delay_Modes)
573 Check_Time : Duration := Monotonic_Clock;
584 Write_Lock (Self_ID);
586 if Mode = Relative then
588 Abs_Time := Time + Check_Time;
590 Rel_Time := Time - Check_Time;
594 if Rel_Time > 0.0 then
595 Self_ID.Common.State := Delay_Sleep;
598 if Self_ID.Pending_Priority_Change then
599 Self_ID.Pending_Priority_Change := False;
600 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
601 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
604 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
607 Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
608 Single_RTS_Lock'Access, Rel_Time, Timedout, Result);
610 Cond_Timed_Wait (Self_ID.Common.LL.CV'Access,
611 Self_ID.Common.LL.L'Access, Rel_Time, Timedout, Result);
614 Check_Time := Monotonic_Clock;
615 exit when Abs_Time <= Check_Time;
617 Rel_Time := Abs_Time - Check_Time;
620 Self_ID.Common.State := Runnable;
636 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
637 pragma Unreferenced (Reason);
639 Cond_Signal (T.Common.LL.CV'Access);
646 procedure Yield (Do_Yield : Boolean := True) is
657 type Prio_Array_Type is array (System.Any_Priority) of Integer;
658 pragma Atomic_Components (Prio_Array_Type);
660 Prio_Array : Prio_Array_Type;
661 -- Global array containing the id of the currently running task for
664 -- Note: we assume that we are on a single processor with run-til-blocked
667 procedure Set_Priority
669 Prio : System.Any_Priority;
670 Loss_Of_Inheritance : Boolean := False)
673 Array_Item : Integer;
676 Res := SetThreadPriority
677 (T.Common.LL.Thread, Interfaces.C.int (Underlying_Priorities (Prio)));
678 pragma Assert (Res = True);
680 if Dispatching_Policy = 'F' then
682 -- Annex D requirement [RM D.2.2 par. 9]:
683 -- If the task drops its priority due to the loss of inherited
684 -- priority, it is added at the head of the ready queue for its
685 -- new active priority.
687 if Loss_Of_Inheritance
688 and then Prio < T.Common.Current_Priority
690 Array_Item := Prio_Array (T.Common.Base_Priority) + 1;
691 Prio_Array (T.Common.Base_Priority) := Array_Item;
694 -- Let some processes a chance to arrive
698 -- Then wait for our turn to proceed
700 exit when Array_Item = Prio_Array (T.Common.Base_Priority)
701 or else Prio_Array (T.Common.Base_Priority) = 1;
704 Prio_Array (T.Common.Base_Priority) :=
705 Prio_Array (T.Common.Base_Priority) - 1;
709 T.Common.Current_Priority := Prio;
716 function Get_Priority (T : Task_Id) return System.Any_Priority is
718 return T.Common.Current_Priority;
725 -- There were two paths were we needed to call Enter_Task :
726 -- 1) from System.Task_Primitives.Operations.Initialize
727 -- 2) from System.Tasking.Stages.Task_Wrapper
729 -- The thread initialisation has to be done only for the first case.
731 -- This is because the GetCurrentThread NT call does not return the
732 -- real thread handler but only a "pseudo" one. It is not possible to
733 -- release the thread handle and free the system ressources from this
734 -- "pseudo" handle. So we really want to keep the real thread handle
735 -- set in System.Task_Primitives.Operations.Create_Task during the
738 procedure Enter_Task (Self_ID : Task_Id) is
739 procedure Init_Float;
740 pragma Import (C, Init_Float, "__gnat_init_float");
741 -- Properly initializes the FPU for x86 systems.
744 Specific.Set (Self_ID);
747 Self_ID.Common.LL.Thread_Id := GetCurrentThreadId;
751 for J in Known_Tasks'Range loop
752 if Known_Tasks (J) = null then
753 Known_Tasks (J) := Self_ID;
754 Self_ID.Known_Tasks_Index := J;
766 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
768 return new Ada_Task_Control_Block (Entry_Num);
775 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
777 -----------------------------
778 -- Register_Foreign_Thread --
779 -----------------------------
781 function Register_Foreign_Thread return Task_Id is
783 if Is_Valid_Task then
786 return Register_Foreign_Thread (GetCurrentThread);
788 end Register_Foreign_Thread;
794 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
796 -- Initialize thread ID to 0, this is needed to detect threads that
797 -- are not yet activated.
799 Self_ID.Common.LL.Thread := 0;
801 Initialize_Cond (Self_ID.Common.LL.CV'Access);
803 if not Single_Lock then
804 Initialize_Lock (Self_ID.Common.LL.L'Access, ATCB_Level);
814 procedure Create_Task
816 Wrapper : System.Address;
817 Stack_Size : System.Parameters.Size_Type;
818 Priority : System.Any_Priority;
819 Succeeded : out Boolean)
821 pragma Unreferenced (Stack_Size);
823 Initial_Stack_Size : constant := 1024;
824 -- We set the initial stack size to 1024. On Windows there is no way to
825 -- fix a task stack size. Only the initial stack size can be set, the
826 -- operating system will raise the task stack size if needed.
829 TaskId : aliased DWORD;
830 pTaskParameter : System.OS_Interface.PVOID;
832 Entry_Point : PTHREAD_START_ROUTINE;
835 pTaskParameter := To_Address (T);
837 Entry_Point := To_PTHREAD_START_ROUTINE (Wrapper);
839 hTask := CreateThread
844 DWORD (Create_Suspended),
845 TaskId'Unchecked_Access);
847 -- Step 1: Create the thread in blocked mode
853 -- Step 2: set its TCB
855 T.Common.LL.Thread := hTask;
857 -- Step 3: set its priority (child has inherited priority from parent)
859 Set_Priority (T, Priority);
861 if Time_Slice_Val = 0 or else Dispatching_Policy = 'F' then
862 -- Here we need Annex E semantics so we disable the NT priority
863 -- boost. A priority boost is temporarily given by the system to a
864 -- thread when it is taken out of a wait state.
866 SetThreadPriorityBoost (hTask, DisablePriorityBoost => True);
869 -- Step 4: Now, start it for good:
871 Result := ResumeThread (hTask);
872 pragma Assert (Result = 1);
874 Succeeded := Result = 1;
881 procedure Finalize_TCB (T : Task_Id) is
882 Self_ID : Task_Id := T;
885 Is_Self : constant Boolean := T = Self;
887 procedure Free is new
888 Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
891 if not Single_Lock then
892 Finalize_Lock (T.Common.LL.L'Access);
895 Finalize_Cond (T.Common.LL.CV'Access);
897 if T.Known_Tasks_Index /= -1 then
898 Known_Tasks (T.Known_Tasks_Index) := null;
901 if Self_ID.Common.LL.Thread /= 0 then
903 -- This task has been activated. Wait for the thread to terminate
904 -- then close it. this is needed to release system ressources.
906 Result := WaitForSingleObject (T.Common.LL.Thread, Wait_Infinite);
907 pragma Assert (Result /= WAIT_FAILED);
908 Succeeded := CloseHandle (T.Common.LL.Thread);
909 pragma Assert (Succeeded = True);
923 procedure Exit_Task is
932 procedure Abort_Task (T : Task_Id) is
933 pragma Unreferenced (T);
938 ----------------------
939 -- Environment_Task --
940 ----------------------
942 function Environment_Task return Task_Id is
944 return Environment_Task_Id;
945 end Environment_Task;
951 procedure Lock_RTS is
953 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
960 procedure Unlock_RTS is
962 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
969 procedure Initialize (Environment_Task : Task_Id) is
971 pragma Unreferenced (Discard);
974 Environment_Task_Id := Environment_Task;
975 OS_Primitives.Initialize;
977 if Time_Slice_Val = 0 or else Dispatching_Policy = 'F' then
979 -- Here we need Annex D semantics, switch the current process to the
980 -- High_Priority_Class.
983 OS_Interface.SetPriorityClass
984 (GetCurrentProcess, High_Priority_Class);
986 -- ??? In theory it should be possible to use the priority class
987 -- Realtime_Prioriry_Class but we suspect a bug in the NT scheduler
988 -- which prevents (in some obscure cases) a thread to get on top of
989 -- the running queue by another thread of lower priority. For
990 -- example cxd8002 ACATS test freeze.
993 TlsIndex := TlsAlloc;
995 -- Initialize the lock used to synchronize chain of all ATCBs.
997 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
999 Environment_Task.Common.LL.Thread := GetCurrentThread;
1000 Enter_Task (Environment_Task);
1003 ---------------------
1004 -- Monotonic_Clock --
1005 ---------------------
1007 function Monotonic_Clock return Duration
1008 renames System.OS_Primitives.Monotonic_Clock;
1014 function RT_Resolution return Duration is
1016 return 0.000_001; -- 1 micro-second
1023 procedure Initialize (S : in out Suspension_Object) is
1025 -- Initialize internal state. It is always initialized to False (ARM
1031 -- Initialize internal mutex
1033 InitializeCriticalSection (S.L'Access);
1035 -- Initialize internal condition variable
1037 S.CV := CreateEvent (null, True, False, Null_Ptr);
1038 pragma Assert (S.CV /= 0);
1045 procedure Finalize (S : in out Suspension_Object) is
1048 -- Destroy internal mutex
1050 DeleteCriticalSection (S.L'Access);
1052 -- Destroy internal condition variable
1054 Result := CloseHandle (S.CV);
1055 pragma Assert (Result = True);
1062 function Current_State (S : Suspension_Object) return Boolean is
1064 -- We do not want to use lock on this read operation. State is marked
1065 -- as Atomic so that we ensure that the value retrieved is correct.
1074 procedure Set_False (S : in out Suspension_Object) is
1076 EnterCriticalSection (S.L'Access);
1080 LeaveCriticalSection (S.L'Access);
1087 procedure Set_True (S : in out Suspension_Object) is
1090 EnterCriticalSection (S.L'Access);
1092 -- If there is already a task waiting on this suspension object then
1093 -- we resume it, leaving the state of the suspension object to False,
1094 -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves
1095 -- the state to True.
1101 Result := SetEvent (S.CV);
1102 pragma Assert (Result = True);
1107 LeaveCriticalSection (S.L'Access);
1110 ------------------------
1111 -- Suspend_Until_True --
1112 ------------------------
1114 procedure Suspend_Until_True (S : in out Suspension_Object) is
1118 EnterCriticalSection (S.L'Access);
1121 -- Program_Error must be raised upon calling Suspend_Until_True
1122 -- if another task is already waiting on that suspension object
1123 -- (ARM D.10 par. 10).
1125 LeaveCriticalSection (S.L'Access);
1127 raise Program_Error;
1129 -- Suspend the task if the state is False. Otherwise, the task
1130 -- continues its execution, and the state of the suspension object
1131 -- is set to False (ARM D.10 par. 9).
1136 LeaveCriticalSection (S.L'Access);
1140 -- Must reset CV BEFORE L is unlocked.
1142 Result_Bool := ResetEvent (S.CV);
1143 pragma Assert (Result_Bool = True);
1145 LeaveCriticalSection (S.L'Access);
1147 Result := WaitForSingleObject (S.CV, Wait_Infinite);
1148 pragma Assert (Result = 0);
1151 end Suspend_Until_True;
1157 -- Dummy versions. The only currently working versions is for solaris
1160 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
1161 pragma Unreferenced (Self_ID);
1166 --------------------
1167 -- Check_No_Locks --
1168 --------------------
1170 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
1171 pragma Unreferenced (Self_ID);
1180 function Suspend_Task
1182 Thread_Self : Thread_Id) return Boolean
1185 if T.Common.LL.Thread /= Thread_Self then
1186 return SuspendThread (T.Common.LL.Thread) = NO_ERROR;
1196 function Resume_Task
1198 Thread_Self : Thread_Id) return Boolean
1201 if T.Common.LL.Thread /= Thread_Self then
1202 return ResumeThread (T.Common.LL.Thread) = NO_ERROR;
1208 end System.Task_Primitives.Operations;