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) 1992-2006, 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 OpenVMS/Alpha 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 System.Soft_Links;
54 -- used for Get_Exc_Stack_Addr
56 with Unchecked_Conversion;
57 with Unchecked_Deallocation;
59 package body System.Task_Primitives.Operations is
61 use System.Tasking.Debug;
64 use System.OS_Interface;
65 use System.Parameters;
66 use System.OS_Primitives;
67 use type System.OS_Primitives.OS_Time;
69 package SSL renames System.Soft_Links;
75 -- The followings are logically constants, but need to be initialized
78 Single_RTS_Lock : aliased RTS_Lock;
79 -- This is a lock to allow only one thread of control in the RTS at
80 -- a time; it is used to execute in mutual exclusion from all other tasks.
81 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
83 ATCB_Key : aliased pthread_key_t;
84 -- Key used to find the Ada Task_Id associated with a thread
86 Environment_Task_Id : Task_Id;
87 -- A variable to hold Task_Id for the environment task.
89 Time_Slice_Val : Integer;
90 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
92 Dispatching_Policy : Character;
93 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
95 Foreign_Task_Elaborated : aliased Boolean := True;
96 -- Used to identified fake tasks (i.e., non-Ada Threads).
104 procedure Initialize (Environment_Task : Task_Id);
105 pragma Inline (Initialize);
106 -- Initialize various data needed by this package.
108 function Is_Valid_Task return Boolean;
109 pragma Inline (Is_Valid_Task);
110 -- Does executing thread have a TCB?
112 procedure Set (Self_Id : Task_Id);
114 -- Set the self id for the current task
116 function Self return Task_Id;
117 pragma Inline (Self);
118 -- Return a pointer to the Ada Task Control Block of the calling task
122 package body Specific is separate;
123 -- The body of this package is target specific.
125 ---------------------------------
126 -- Support for foreign threads --
127 ---------------------------------
129 function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
130 -- Allocate and Initialize a new ATCB for the current Thread
132 function Register_Foreign_Thread
133 (Thread : Thread_Id) return Task_Id is separate;
135 -----------------------
136 -- Local Subprograms --
137 -----------------------
139 function To_Task_Id is new Unchecked_Conversion (System.Address, Task_Id);
141 function To_Address is new Unchecked_Conversion (Task_Id, System.Address);
143 function Get_Exc_Stack_Addr return Address;
144 -- Replace System.Soft_Links.Get_Exc_Stack_Addr_NT
146 procedure Timer_Sleep_AST (ID : Address);
147 -- Signal the condition variable when AST fires.
149 procedure Timer_Sleep_AST (ID : Address) is
150 Result : Interfaces.C.int;
151 Self_ID : constant Task_Id := To_Task_Id (ID);
153 Self_ID.Common.LL.AST_Pending := False;
154 Result := pthread_cond_signal_int_np (Self_ID.Common.LL.CV'Access);
155 pragma Assert (Result = 0);
162 -- The underlying thread system sets a guard page at the
163 -- bottom of a thread stack, so nothing is needed.
164 -- ??? Check the comment above
166 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
167 pragma Unreferenced (T);
168 pragma Unreferenced (On);
177 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
179 return T.Common.LL.Thread;
186 function Self return Task_Id renames Specific.Self;
188 ---------------------
189 -- Initialize_Lock --
190 ---------------------
192 -- Note: mutexes and cond_variables needed per-task basis are
193 -- initialized in Initialize_TCB and the Storage_Error is
194 -- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
195 -- used in RTS is initialized before any status change of RTS.
196 -- Therefore rasing Storage_Error in the following routines
197 -- should be able to be handled safely.
199 procedure Initialize_Lock (Prio : System.Any_Priority; L : access Lock) is
200 Attributes : aliased pthread_mutexattr_t;
201 Result : Interfaces.C.int;
204 Result := pthread_mutexattr_init (Attributes'Access);
205 pragma Assert (Result = 0 or else Result = ENOMEM);
207 if Result = ENOMEM then
212 L.Prio := Interfaces.C.int (Prio);
214 Result := pthread_mutex_init (L.L'Access, Attributes'Access);
215 pragma Assert (Result = 0 or else Result = ENOMEM);
217 if Result = ENOMEM then
221 Result := pthread_mutexattr_destroy (Attributes'Access);
222 pragma Assert (Result = 0);
225 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
226 pragma Unreferenced (Level);
228 Attributes : aliased pthread_mutexattr_t;
229 Result : Interfaces.C.int;
232 Result := pthread_mutexattr_init (Attributes'Access);
233 pragma Assert (Result = 0 or else Result = ENOMEM);
235 if Result = ENOMEM then
239 -- Don't use, see comment in s-osinte.ads about ERRORCHECK mutexes???
240 -- Result := pthread_mutexattr_settype_np
241 -- (Attributes'Access, PTHREAD_MUTEX_ERRORCHECK_NP);
242 -- pragma Assert (Result = 0);
244 -- Result := pthread_mutexattr_setprotocol
245 -- (Attributes'Access, PTHREAD_PRIO_PROTECT);
246 -- pragma Assert (Result = 0);
248 -- Result := pthread_mutexattr_setprioceiling
249 -- (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
250 -- pragma Assert (Result = 0);
252 Result := pthread_mutex_init (L, Attributes'Access);
254 pragma Assert (Result = 0 or else Result = ENOMEM);
256 if Result = ENOMEM then
260 Result := pthread_mutexattr_destroy (Attributes'Access);
261 pragma Assert (Result = 0);
268 procedure Finalize_Lock (L : access Lock) is
269 Result : Interfaces.C.int;
271 Result := pthread_mutex_destroy (L.L'Access);
272 pragma Assert (Result = 0);
275 procedure Finalize_Lock (L : access RTS_Lock) is
276 Result : Interfaces.C.int;
278 Result := pthread_mutex_destroy (L);
279 pragma Assert (Result = 0);
286 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
287 Self_ID : constant Task_Id := Self;
288 All_Tasks_Link : constant Task_Id := Self.Common.All_Tasks_Link;
289 Current_Prio : System.Any_Priority;
290 Result : Interfaces.C.int;
293 Current_Prio := Get_Priority (Self_ID);
295 -- If there is no other tasks, no need to check priorities
297 if All_Tasks_Link /= Null_Task
298 and then L.Prio < Interfaces.C.int (Current_Prio)
300 Ceiling_Violation := True;
304 Result := pthread_mutex_lock (L.L'Access);
305 pragma Assert (Result = 0);
307 Ceiling_Violation := False;
308 -- Why is this commented out ???
309 -- L.Prio_Save := Interfaces.C.int (Current_Prio);
310 -- Set_Priority (Self_ID, System.Any_Priority (L.Prio));
314 (L : access RTS_Lock;
315 Global_Lock : Boolean := False)
317 Result : Interfaces.C.int;
319 if not Single_Lock or else Global_Lock then
320 Result := pthread_mutex_lock (L);
321 pragma Assert (Result = 0);
325 procedure Write_Lock (T : Task_Id) is
326 Result : Interfaces.C.int;
328 if not Single_Lock then
329 Result := pthread_mutex_lock (T.Common.LL.L'Access);
330 pragma Assert (Result = 0);
338 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
340 Write_Lock (L, Ceiling_Violation);
347 procedure Unlock (L : access Lock) is
348 Result : Interfaces.C.int;
350 Result := pthread_mutex_unlock (L.L'Access);
351 pragma Assert (Result = 0);
354 procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
355 Result : Interfaces.C.int;
357 if not Single_Lock or else Global_Lock then
358 Result := pthread_mutex_unlock (L);
359 pragma Assert (Result = 0);
363 procedure Unlock (T : Task_Id) is
364 Result : Interfaces.C.int;
366 if not Single_Lock then
367 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
368 pragma Assert (Result = 0);
378 Reason : System.Tasking.Task_States)
380 pragma Unreferenced (Reason);
381 Result : Interfaces.C.int;
385 Result := pthread_cond_wait
386 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
388 Result := pthread_cond_wait
389 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
392 -- EINTR is not considered a failure
394 pragma Assert (Result = 0 or else Result = EINTR);
396 if Self_ID.Deferral_Level = 0
397 and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
400 raise Standard'Abort_Signal;
408 procedure Timed_Sleep
411 Mode : ST.Delay_Modes;
412 Reason : System.Tasking.Task_States;
413 Timedout : out Boolean;
414 Yielded : out Boolean)
416 pragma Unreferenced (Reason);
418 Sleep_Time : OS_Time;
419 Result : Interfaces.C.int;
420 Status : Cond_Value_Type;
422 -- The body below requires more comments ???
428 Sleep_Time := To_OS_Time (Time, Mode);
430 if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
431 or else Self_ID.Pending_Priority_Change
436 Self_ID.Common.LL.AST_Pending := True;
439 (Status, 0, Sleep_Time,
440 Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
442 if (Status and 1) /= 1 then
447 Result := pthread_cond_wait
448 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
449 pragma Assert (Result = 0);
452 Result := pthread_cond_wait
453 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
454 pragma Assert (Result = 0);
459 if not Self_ID.Common.LL.AST_Pending then
462 Sys_Cantim (Status, To_Address (Self_ID), 0);
463 pragma Assert ((Status and 1) = 1);
471 procedure Timed_Delay
474 Mode : ST.Delay_Modes)
476 Sleep_Time : OS_Time;
477 Result : Interfaces.C.int;
478 Status : Cond_Value_Type;
479 Yielded : Boolean := False;
486 -- More comments required in body below ???
488 Write_Lock (Self_ID);
490 if Time /= 0.0 or else Mode /= Relative then
491 Sleep_Time := To_OS_Time (Time, Mode);
493 if Mode = Relative or else OS_Clock < Sleep_Time then
494 Self_ID.Common.State := Delay_Sleep;
495 Self_ID.Common.LL.AST_Pending := True;
498 (Status, 0, Sleep_Time,
499 Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
501 if (Status and 1) /= 1 then
506 if Self_ID.Pending_Priority_Change then
507 Self_ID.Pending_Priority_Change := False;
508 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
509 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
512 if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
513 Sys_Cantim (Status, To_Address (Self_ID), 0);
514 pragma Assert ((Status and 1) = 1);
519 Result := pthread_cond_wait
520 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
521 pragma Assert (Result = 0);
523 Result := pthread_cond_wait
524 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
525 pragma Assert (Result = 0);
530 exit when not Self_ID.Common.LL.AST_Pending;
533 Self_ID.Common.State := Runnable;
544 Result := sched_yield;
545 pragma Assert (Result = 0);
549 ---------------------
550 -- Monotonic_Clock --
551 ---------------------
553 function Monotonic_Clock return Duration
554 renames System.OS_Primitives.Monotonic_Clock;
560 function RT_Resolution return Duration is
569 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
570 pragma Unreferenced (Reason);
571 Result : Interfaces.C.int;
573 Result := pthread_cond_signal (T.Common.LL.CV'Access);
574 pragma Assert (Result = 0);
581 procedure Yield (Do_Yield : Boolean := True) is
582 Result : Interfaces.C.int;
583 pragma Unreferenced (Result);
586 Result := sched_yield;
594 procedure Set_Priority
596 Prio : System.Any_Priority;
597 Loss_Of_Inheritance : Boolean := False)
599 pragma Unreferenced (Loss_Of_Inheritance);
601 Result : Interfaces.C.int;
602 Param : aliased struct_sched_param;
605 T.Common.Current_Priority := Prio;
606 Param.sched_priority := Interfaces.C.int (Underlying_Priorities (Prio));
608 if Time_Slice_Val > 0 then
609 Result := pthread_setschedparam
610 (T.Common.LL.Thread, SCHED_RR, Param'Access);
612 elsif Dispatching_Policy = 'F' or else Time_Slice_Val = 0 then
613 Result := pthread_setschedparam
614 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
617 -- SCHED_OTHER priorities are restricted to the range 8 - 15.
618 -- Since the translation from Underlying priorities results
619 -- in a range of 16 - 31, dividing by 2 gives the correct result.
621 Param.sched_priority := Param.sched_priority / 2;
622 Result := pthread_setschedparam
623 (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
626 pragma Assert (Result = 0);
633 function Get_Priority (T : Task_Id) return System.Any_Priority is
635 return T.Common.Current_Priority;
642 procedure Enter_Task (Self_ID : Task_Id) is
644 Self_ID.Common.LL.Thread := pthread_self;
646 Specific.Set (Self_ID);
650 for J in Known_Tasks'Range loop
651 if Known_Tasks (J) = null then
652 Known_Tasks (J) := Self_ID;
653 Self_ID.Known_Tasks_Index := J;
665 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
667 return new Ada_Task_Control_Block (Entry_Num);
674 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
676 -----------------------------
677 -- Register_Foreign_Thread --
678 -----------------------------
680 function Register_Foreign_Thread return Task_Id is
682 if Is_Valid_Task then
685 return Register_Foreign_Thread (pthread_self);
687 end Register_Foreign_Thread;
693 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
694 Mutex_Attr : aliased pthread_mutexattr_t;
695 Result : Interfaces.C.int;
696 Cond_Attr : aliased pthread_condattr_t;
699 -- More comments required in body below ???
701 if not Single_Lock then
702 Result := pthread_mutexattr_init (Mutex_Attr'Access);
703 pragma Assert (Result = 0 or else Result = ENOMEM);
706 Result := pthread_mutex_init (Self_ID.Common.LL.L'Access,
708 pragma Assert (Result = 0 or else Result = ENOMEM);
716 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
717 pragma Assert (Result = 0);
720 Result := pthread_condattr_init (Cond_Attr'Access);
721 pragma Assert (Result = 0 or else Result = ENOMEM);
724 Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
726 pragma Assert (Result = 0 or else Result = ENOMEM);
731 Self_ID.Common.LL.Exc_Stack_Ptr := new Exc_Stack_T;
734 if not Single_Lock then
735 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
736 pragma Assert (Result = 0);
742 Result := pthread_condattr_destroy (Cond_Attr'Access);
743 pragma Assert (Result = 0);
746 ------------------------
747 -- Get_Exc_Stack_Addr --
748 ------------------------
750 function Get_Exc_Stack_Addr return Address is
752 return Self.Common.LL.Exc_Stack_Ptr (Exc_Stack_T'Last)'Address;
753 end Get_Exc_Stack_Addr;
759 procedure Create_Task
761 Wrapper : System.Address;
762 Stack_Size : System.Parameters.Size_Type;
763 Priority : System.Any_Priority;
764 Succeeded : out Boolean)
766 Attributes : aliased pthread_attr_t;
767 Result : Interfaces.C.int;
769 function Thread_Body_Access is new
770 Unchecked_Conversion (System.Address, Thread_Body);
773 -- Since the initial signal mask of a thread is inherited from the
774 -- creator, we need to set our local signal mask mask all signals
775 -- during the creation operation, to make sure the new thread is
776 -- not disturbed by signals before it has set its own Task_Id.
778 Result := pthread_attr_init (Attributes'Access);
779 pragma Assert (Result = 0 or else Result = ENOMEM);
786 Result := pthread_attr_setdetachstate
787 (Attributes'Access, PTHREAD_CREATE_DETACHED);
788 pragma Assert (Result = 0);
790 Result := pthread_attr_setstacksize
791 (Attributes'Access, Interfaces.C.size_t (Stack_Size));
792 pragma Assert (Result = 0);
794 -- This call may be unnecessary, not sure. ???
797 pthread_attr_setinheritsched
798 (Attributes'Access, PTHREAD_EXPLICIT_SCHED);
799 pragma Assert (Result = 0);
801 Result := pthread_create
802 (T.Common.LL.Thread'Access,
804 Thread_Body_Access (Wrapper),
807 -- ENOMEM is a valid run-time error. Don't shut down.
809 pragma Assert (Result = 0
810 or else Result = EAGAIN or else Result = ENOMEM);
812 Succeeded := Result = 0;
814 Result := pthread_attr_destroy (Attributes'Access);
815 pragma Assert (Result = 0);
818 Set_Priority (T, Priority);
826 procedure Finalize_TCB (T : Task_Id) is
827 Result : Interfaces.C.int;
829 Is_Self : constant Boolean := T = Self;
831 procedure Free is new
832 Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
834 procedure Free is new Unchecked_Deallocation
835 (Exc_Stack_T, Exc_Stack_Ptr_T);
838 if not Single_Lock then
839 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
840 pragma Assert (Result = 0);
843 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
844 pragma Assert (Result = 0);
846 if T.Known_Tasks_Index /= -1 then
847 Known_Tasks (T.Known_Tasks_Index) := null;
850 Free (T.Common.LL.Exc_Stack_Ptr);
863 procedure Exit_Task is
872 procedure Abort_Task (T : Task_Id) is
874 -- Interrupt Server_Tasks may be waiting on an event flag
876 if T.Common.State = Interrupt_Server_Blocked_On_Event_Flag then
877 Wakeup (T, Interrupt_Server_Blocked_On_Event_Flag);
885 procedure Initialize (S : in out Suspension_Object) is
886 Mutex_Attr : aliased pthread_mutexattr_t;
887 Cond_Attr : aliased pthread_condattr_t;
888 Result : Interfaces.C.int;
890 -- Initialize internal state. It is always initialized to False (ARM
896 -- Initialize internal mutex
898 Result := pthread_mutexattr_init (Mutex_Attr'Access);
899 pragma Assert (Result = 0 or else Result = ENOMEM);
901 if Result = ENOMEM then
905 Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access);
906 pragma Assert (Result = 0 or else Result = ENOMEM);
908 if Result = ENOMEM then
909 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
910 pragma Assert (Result = 0);
915 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
916 pragma Assert (Result = 0);
918 -- Initialize internal condition variable
920 Result := pthread_condattr_init (Cond_Attr'Access);
921 pragma Assert (Result = 0 or else Result = ENOMEM);
924 Result := pthread_mutex_destroy (S.L'Access);
925 pragma Assert (Result = 0);
927 if Result = ENOMEM then
932 Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access);
933 pragma Assert (Result = 0 or else Result = ENOMEM);
936 Result := pthread_mutex_destroy (S.L'Access);
937 pragma Assert (Result = 0);
939 if Result = ENOMEM then
940 Result := pthread_condattr_destroy (Cond_Attr'Access);
941 pragma Assert (Result = 0);
947 Result := pthread_condattr_destroy (Cond_Attr'Access);
948 pragma Assert (Result = 0);
955 procedure Finalize (S : in out Suspension_Object) is
956 Result : Interfaces.C.int;
958 -- Destroy internal mutex
960 Result := pthread_mutex_destroy (S.L'Access);
961 pragma Assert (Result = 0);
963 -- Destroy internal condition variable
965 Result := pthread_cond_destroy (S.CV'Access);
966 pragma Assert (Result = 0);
973 function Current_State (S : Suspension_Object) return Boolean is
975 -- We do not want to use lock on this read operation. State is marked
976 -- as Atomic so that we ensure that the value retrieved is correct.
985 procedure Set_False (S : in out Suspension_Object) is
986 Result : Interfaces.C.int;
988 Result := pthread_mutex_lock (S.L'Access);
989 pragma Assert (Result = 0);
993 Result := pthread_mutex_unlock (S.L'Access);
994 pragma Assert (Result = 0);
1001 procedure Set_True (S : in out Suspension_Object) is
1002 Result : Interfaces.C.int;
1004 Result := pthread_mutex_lock (S.L'Access);
1005 pragma Assert (Result = 0);
1007 -- If there is already a task waiting on this suspension object then
1008 -- we resume it, leaving the state of the suspension object to False,
1009 -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves
1010 -- the state to True.
1016 Result := pthread_cond_signal (S.CV'Access);
1017 pragma Assert (Result = 0);
1022 Result := pthread_mutex_unlock (S.L'Access);
1023 pragma Assert (Result = 0);
1026 ------------------------
1027 -- Suspend_Until_True --
1028 ------------------------
1030 procedure Suspend_Until_True (S : in out Suspension_Object) is
1031 Result : Interfaces.C.int;
1033 Result := pthread_mutex_lock (S.L'Access);
1034 pragma Assert (Result = 0);
1037 -- Program_Error must be raised upon calling Suspend_Until_True
1038 -- if another task is already waiting on that suspension object
1039 -- (ARM D.10 par. 10).
1041 Result := pthread_mutex_unlock (S.L'Access);
1042 pragma Assert (Result = 0);
1044 raise Program_Error;
1046 -- Suspend the task if the state is False. Otherwise, the task
1047 -- continues its execution, and the state of the suspension object
1048 -- is set to False (ARM D.10 par. 9).
1054 Result := pthread_cond_wait (S.CV'Access, S.L'Access);
1058 Result := pthread_mutex_unlock (S.L'Access);
1059 pragma Assert (Result = 0);
1060 end Suspend_Until_True;
1068 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
1069 pragma Unreferenced (Self_ID);
1074 --------------------
1075 -- Check_No_Locks --
1076 --------------------
1078 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
1079 pragma Unreferenced (Self_ID);
1084 ----------------------
1085 -- Environment_Task --
1086 ----------------------
1088 function Environment_Task return Task_Id is
1090 return Environment_Task_Id;
1091 end Environment_Task;
1097 procedure Lock_RTS is
1099 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
1106 procedure Unlock_RTS is
1108 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
1115 function Suspend_Task
1117 Thread_Self : Thread_Id) return Boolean
1119 pragma Unreferenced (T);
1120 pragma Unreferenced (Thread_Self);
1129 function Resume_Task
1131 Thread_Self : Thread_Id) return Boolean
1133 pragma Unreferenced (T);
1134 pragma Unreferenced (Thread_Self);
1143 procedure Initialize (Environment_Task : Task_Id) is
1145 Environment_Task_Id := Environment_Task;
1147 SSL.Get_Exc_Stack_Addr := Get_Exc_Stack_Addr'Access;
1149 -- Initialize the lock used to synchronize chain of all ATCBs
1151 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1153 Specific.Initialize (Environment_Task);
1155 Enter_Task (Environment_Task);
1158 end System.Task_Primitives.Operations;