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) 1992-2007, 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
55 -- Abort_Defer/Undefer
58 -- used for Short_Address
60 with Ada.Unchecked_Conversion;
61 with Ada.Unchecked_Deallocation;
63 package body System.Task_Primitives.Operations is
65 use System.Tasking.Debug;
68 use System.OS_Interface;
69 use System.Parameters;
70 use System.OS_Primitives;
71 use type System.OS_Primitives.OS_Time;
73 package SSL renames System.Soft_Links;
79 -- The followings are logically constants, but need to be initialized
82 Single_RTS_Lock : aliased RTS_Lock;
83 -- This is a lock to allow only one thread of control in the RTS at
84 -- a time; it is used to execute in mutual exclusion from all other tasks.
85 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
87 ATCB_Key : aliased pthread_key_t;
88 -- Key used to find the Ada Task_Id associated with a thread
90 Environment_Task_Id : Task_Id;
91 -- A variable to hold Task_Id for the environment task
93 Time_Slice_Val : Integer;
94 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
96 Dispatching_Policy : Character;
97 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
99 Foreign_Task_Elaborated : aliased Boolean := True;
100 -- Used to identified fake tasks (i.e., non-Ada Threads)
108 procedure Initialize (Environment_Task : Task_Id);
109 pragma Inline (Initialize);
110 -- Initialize various data needed by this package
112 function Is_Valid_Task return Boolean;
113 pragma Inline (Is_Valid_Task);
114 -- Does executing thread have a TCB?
116 procedure Set (Self_Id : Task_Id);
118 -- Set the self id for the current task
120 function Self return Task_Id;
121 pragma Inline (Self);
122 -- Return a pointer to the Ada Task Control Block of the calling task
126 package body Specific is separate;
127 -- The body of this package is target specific
129 ---------------------------------
130 -- Support for foreign threads --
131 ---------------------------------
133 function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
134 -- Allocate and Initialize a new ATCB for the current Thread
136 function Register_Foreign_Thread
137 (Thread : Thread_Id) return Task_Id is separate;
139 -----------------------
140 -- Local Subprograms --
141 -----------------------
143 function To_Task_Id is
144 new Ada.Unchecked_Conversion (System.Address, Task_Id);
146 function To_Address is
147 new Ada.Unchecked_Conversion (Task_Id, System.Address);
149 function Get_Exc_Stack_Addr return Address;
150 -- Replace System.Soft_Links.Get_Exc_Stack_Addr_NT
152 procedure Timer_Sleep_AST (ID : Address);
153 pragma Convention (C, Timer_Sleep_AST);
154 -- Signal the condition variable when AST fires
156 procedure Timer_Sleep_AST (ID : Address) is
157 Result : Interfaces.C.int;
158 pragma Warnings (Off, Result);
159 Self_ID : constant Task_Id := To_Task_Id (ID);
161 Self_ID.Common.LL.AST_Pending := False;
162 Result := pthread_cond_signal_int_np (Self_ID.Common.LL.CV'Access);
163 pragma Assert (Result = 0);
170 -- The underlying thread system sets a guard page at the bottom of a thread
171 -- stack, so nothing is needed.
172 -- ??? Check the comment above
174 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
175 pragma Unreferenced (T);
176 pragma Unreferenced (On);
185 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
187 return T.Common.LL.Thread;
194 function Self return Task_Id renames Specific.Self;
196 ---------------------
197 -- Initialize_Lock --
198 ---------------------
200 -- Note: mutexes and cond_variables needed per-task basis are initialized
201 -- in Initialize_TCB and the Storage_Error is handled. Other mutexes (such
202 -- as RTS_Lock, Memory_Lock...) used in RTS is initialized before any
203 -- status change of RTS. Therefore rasing Storage_Error in the following
204 -- routines should be able to be handled safely.
206 procedure Initialize_Lock
207 (Prio : System.Any_Priority;
208 L : not null access Lock)
210 Attributes : aliased pthread_mutexattr_t;
211 Result : Interfaces.C.int;
214 Result := pthread_mutexattr_init (Attributes'Access);
215 pragma Assert (Result = 0 or else Result = ENOMEM);
217 if Result = ENOMEM then
222 L.Prio := Interfaces.C.int (Prio);
224 Result := pthread_mutex_init (L.L'Access, Attributes'Access);
225 pragma Assert (Result = 0 or else Result = ENOMEM);
227 if Result = ENOMEM then
231 Result := pthread_mutexattr_destroy (Attributes'Access);
232 pragma Assert (Result = 0);
235 procedure Initialize_Lock
236 (L : not null access RTS_Lock;
239 pragma Unreferenced (Level);
241 Attributes : aliased pthread_mutexattr_t;
242 Result : Interfaces.C.int;
245 Result := pthread_mutexattr_init (Attributes'Access);
246 pragma Assert (Result = 0 or else Result = ENOMEM);
248 if Result = ENOMEM then
252 -- Don't use, see comment in s-osinte.ads about ERRORCHECK mutexes???
253 -- Result := pthread_mutexattr_settype_np
254 -- (Attributes'Access, PTHREAD_MUTEX_ERRORCHECK_NP);
255 -- pragma Assert (Result = 0);
257 -- Result := pthread_mutexattr_setprotocol
258 -- (Attributes'Access, PTHREAD_PRIO_PROTECT);
259 -- pragma Assert (Result = 0);
261 -- Result := pthread_mutexattr_setprioceiling
262 -- (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
263 -- pragma Assert (Result = 0);
265 Result := pthread_mutex_init (L, Attributes'Access);
267 pragma Assert (Result = 0 or else Result = ENOMEM);
269 if Result = ENOMEM then
273 Result := pthread_mutexattr_destroy (Attributes'Access);
274 pragma Assert (Result = 0);
281 procedure Finalize_Lock (L : not null access Lock) is
282 Result : Interfaces.C.int;
284 Result := pthread_mutex_destroy (L.L'Access);
285 pragma Assert (Result = 0);
288 procedure Finalize_Lock (L : not null access RTS_Lock) is
289 Result : Interfaces.C.int;
291 Result := pthread_mutex_destroy (L);
292 pragma Assert (Result = 0);
300 (L : not null access Lock;
301 Ceiling_Violation : out Boolean)
303 Self_ID : constant Task_Id := Self;
304 All_Tasks_Link : constant Task_Id := Self.Common.All_Tasks_Link;
305 Current_Prio : System.Any_Priority;
306 Result : Interfaces.C.int;
309 Current_Prio := Get_Priority (Self_ID);
311 -- If there is no other tasks, no need to check priorities
313 if All_Tasks_Link /= Null_Task
314 and then L.Prio < Interfaces.C.int (Current_Prio)
316 Ceiling_Violation := True;
320 Result := pthread_mutex_lock (L.L'Access);
321 pragma Assert (Result = 0);
323 Ceiling_Violation := False;
324 -- Why is this commented out ???
325 -- L.Prio_Save := Interfaces.C.int (Current_Prio);
326 -- Set_Priority (Self_ID, System.Any_Priority (L.Prio));
330 (L : not null access RTS_Lock;
331 Global_Lock : Boolean := False)
333 Result : Interfaces.C.int;
335 if not Single_Lock or else Global_Lock then
336 Result := pthread_mutex_lock (L);
337 pragma Assert (Result = 0);
341 procedure Write_Lock (T : Task_Id) is
342 Result : Interfaces.C.int;
344 if not Single_Lock then
345 Result := pthread_mutex_lock (T.Common.LL.L'Access);
346 pragma Assert (Result = 0);
355 (L : not null access Lock;
356 Ceiling_Violation : out Boolean)
359 Write_Lock (L, Ceiling_Violation);
366 procedure Unlock (L : not null access Lock) is
367 Result : Interfaces.C.int;
369 Result := pthread_mutex_unlock (L.L'Access);
370 pragma Assert (Result = 0);
374 (L : not null access RTS_Lock;
375 Global_Lock : Boolean := False)
377 Result : Interfaces.C.int;
379 if not Single_Lock or else Global_Lock then
380 Result := pthread_mutex_unlock (L);
381 pragma Assert (Result = 0);
385 procedure Unlock (T : Task_Id) is
386 Result : Interfaces.C.int;
388 if not Single_Lock then
389 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
390 pragma Assert (Result = 0);
398 -- Dynamic priority ceilings are not supported by the underlying system
400 procedure Set_Ceiling
401 (L : not null access Lock;
402 Prio : System.Any_Priority)
404 pragma Unreferenced (L, Prio);
415 Reason : System.Tasking.Task_States)
417 pragma Unreferenced (Reason);
418 Result : Interfaces.C.int;
424 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
428 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
431 -- EINTR is not considered a failure
433 pragma Assert (Result = 0 or else Result = EINTR);
435 if Self_ID.Deferral_Level = 0
436 and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
439 raise Standard'Abort_Signal;
447 procedure Timed_Sleep
450 Mode : ST.Delay_Modes;
451 Reason : System.Tasking.Task_States;
452 Timedout : out Boolean;
453 Yielded : out Boolean)
455 pragma Unreferenced (Reason);
457 Sleep_Time : OS_Time;
458 Result : Interfaces.C.int;
459 Status : Cond_Value_Type;
461 -- The body below requires more comments ???
467 Sleep_Time := To_OS_Time (Time, Mode);
469 if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
473 Self_ID.Common.LL.AST_Pending := True;
476 (Status, 0, Sleep_Time,
477 Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
479 if (Status and 1) /= 1 then
486 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
487 pragma Assert (Result = 0);
492 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
493 pragma Assert (Result = 0);
498 if not Self_ID.Common.LL.AST_Pending then
501 Sys_Cantim (Status, To_Address (Self_ID), 0);
502 pragma Assert ((Status and 1) = 1);
510 procedure Timed_Delay
513 Mode : ST.Delay_Modes)
515 Sleep_Time : OS_Time;
516 Result : Interfaces.C.int;
517 Status : Cond_Value_Type;
518 Yielded : Boolean := False;
525 -- More comments required in body below ???
527 Write_Lock (Self_ID);
529 if Time /= 0.0 or else Mode /= Relative then
530 Sleep_Time := To_OS_Time (Time, Mode);
532 if Mode = Relative or else OS_Clock < Sleep_Time then
533 Self_ID.Common.State := Delay_Sleep;
534 Self_ID.Common.LL.AST_Pending := True;
537 (Status, 0, Sleep_Time,
538 Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
540 -- Comment following test
542 if (Status and 1) /= 1 then
547 if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
548 Sys_Cantim (Status, To_Address (Self_ID), 0);
549 pragma Assert ((Status and 1) = 1);
556 (Self_ID.Common.LL.CV'Access,
557 Single_RTS_Lock'Access);
558 pragma Assert (Result = 0);
562 (Self_ID.Common.LL.CV'Access,
563 Self_ID.Common.LL.L'Access);
564 pragma Assert (Result = 0);
569 exit when not Self_ID.Common.LL.AST_Pending;
572 Self_ID.Common.State := Runnable;
583 Result := sched_yield;
584 pragma Assert (Result = 0);
588 ---------------------
589 -- Monotonic_Clock --
590 ---------------------
592 function Monotonic_Clock return Duration
593 renames System.OS_Primitives.Monotonic_Clock;
599 function RT_Resolution return Duration is
601 -- Document origin of this magic constant ???
609 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
610 pragma Unreferenced (Reason);
611 Result : Interfaces.C.int;
613 Result := pthread_cond_signal (T.Common.LL.CV'Access);
614 pragma Assert (Result = 0);
621 procedure Yield (Do_Yield : Boolean := True) is
622 Result : Interfaces.C.int;
623 pragma Unreferenced (Result);
626 Result := sched_yield;
634 procedure Set_Priority
636 Prio : System.Any_Priority;
637 Loss_Of_Inheritance : Boolean := False)
639 pragma Unreferenced (Loss_Of_Inheritance);
641 Result : Interfaces.C.int;
642 Param : aliased struct_sched_param;
644 function Get_Policy (Prio : System.Any_Priority) return Character;
645 pragma Import (C, Get_Policy, "__gnat_get_specific_dispatching");
646 -- Get priority specific dispatching policy
648 Priority_Specific_Policy : constant Character := Get_Policy (Prio);
649 -- Upper case first character of the policy name corresponding to the
650 -- task as set by a Priority_Specific_Dispatching pragma.
653 T.Common.Current_Priority := Prio;
654 Param.sched_priority := Interfaces.C.int (Underlying_Priorities (Prio));
656 if Dispatching_Policy = 'R'
657 or else Priority_Specific_Policy = 'R'
658 or else Time_Slice_Val > 0
661 pthread_setschedparam
662 (T.Common.LL.Thread, SCHED_RR, Param'Access);
664 elsif Dispatching_Policy = 'F'
665 or else Priority_Specific_Policy = 'F'
666 or else Time_Slice_Val = 0
669 pthread_setschedparam
670 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
673 -- SCHED_OTHER priorities are restricted to the range 8 - 15.
674 -- Since the translation from Underlying priorities results
675 -- in a range of 16 - 31, dividing by 2 gives the correct result.
677 Param.sched_priority := Param.sched_priority / 2;
679 pthread_setschedparam
680 (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
683 pragma Assert (Result = 0);
690 function Get_Priority (T : Task_Id) return System.Any_Priority is
692 return T.Common.Current_Priority;
699 procedure Enter_Task (Self_ID : Task_Id) is
701 Self_ID.Common.LL.Thread := pthread_self;
703 Specific.Set (Self_ID);
707 for J in Known_Tasks'Range loop
708 if Known_Tasks (J) = null then
709 Known_Tasks (J) := Self_ID;
710 Self_ID.Known_Tasks_Index := J;
722 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
724 return new Ada_Task_Control_Block (Entry_Num);
731 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
733 -----------------------------
734 -- Register_Foreign_Thread --
735 -----------------------------
737 function Register_Foreign_Thread return Task_Id is
739 if Is_Valid_Task then
742 return Register_Foreign_Thread (pthread_self);
744 end Register_Foreign_Thread;
750 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
751 Mutex_Attr : aliased pthread_mutexattr_t;
752 Result : Interfaces.C.int;
753 Cond_Attr : aliased pthread_condattr_t;
756 -- More comments required in body below ???
758 if not Single_Lock then
759 Result := pthread_mutexattr_init (Mutex_Attr'Access);
760 pragma Assert (Result = 0 or else Result = ENOMEM);
765 (Self_ID.Common.LL.L'Access, Mutex_Attr'Access);
766 pragma Assert (Result = 0 or else Result = ENOMEM);
774 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
775 pragma Assert (Result = 0);
778 Result := pthread_condattr_init (Cond_Attr'Access);
779 pragma Assert (Result = 0 or else Result = ENOMEM);
784 (Self_ID.Common.LL.CV'Access, Cond_Attr'Access);
785 pragma Assert (Result = 0 or else Result = ENOMEM);
790 Self_ID.Common.LL.Exc_Stack_Ptr := new Exc_Stack_T;
793 if not Single_Lock then
794 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
795 pragma Assert (Result = 0);
801 Result := pthread_condattr_destroy (Cond_Attr'Access);
802 pragma Assert (Result = 0);
805 ------------------------
806 -- Get_Exc_Stack_Addr --
807 ------------------------
809 function Get_Exc_Stack_Addr return Address is
811 return Self.Common.LL.Exc_Stack_Ptr (Exc_Stack_T'Last)'Address;
812 end Get_Exc_Stack_Addr;
818 procedure Create_Task
820 Wrapper : System.Address;
821 Stack_Size : System.Parameters.Size_Type;
822 Priority : System.Any_Priority;
823 Succeeded : out Boolean)
825 Attributes : aliased pthread_attr_t;
826 Result : Interfaces.C.int;
828 function Thread_Body_Access is new
829 Ada.Unchecked_Conversion (System.Aux_DEC.Short_Address, Thread_Body);
832 -- Since the initial signal mask of a thread is inherited from the
833 -- creator, we need to set our local signal mask mask all signals
834 -- during the creation operation, to make sure the new thread is
835 -- not disturbed by signals before it has set its own Task_Id.
837 Result := pthread_attr_init (Attributes'Access);
838 pragma Assert (Result = 0 or else Result = ENOMEM);
845 Result := pthread_attr_setdetachstate
846 (Attributes'Access, PTHREAD_CREATE_DETACHED);
847 pragma Assert (Result = 0);
849 Result := pthread_attr_setstacksize
850 (Attributes'Access, Interfaces.C.size_t (Stack_Size));
851 pragma Assert (Result = 0);
853 -- This call may be unnecessary, not sure. ???
856 pthread_attr_setinheritsched
857 (Attributes'Access, PTHREAD_EXPLICIT_SCHED);
858 pragma Assert (Result = 0);
862 (T.Common.LL.Thread'Access,
864 Thread_Body_Access (Wrapper),
867 -- ENOMEM is a valid run-time error -- do not shut down
869 pragma Assert (Result = 0
870 or else Result = EAGAIN or else Result = ENOMEM);
872 Succeeded := Result = 0;
874 Result := pthread_attr_destroy (Attributes'Access);
875 pragma Assert (Result = 0);
878 Set_Priority (T, Priority);
886 procedure Finalize_TCB (T : Task_Id) is
887 Result : Interfaces.C.int;
889 Is_Self : constant Boolean := T = Self;
891 procedure Free is new
892 Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
894 procedure Free is new Ada.Unchecked_Deallocation
895 (Exc_Stack_T, Exc_Stack_Ptr_T);
898 if not Single_Lock then
899 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
900 pragma Assert (Result = 0);
903 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
904 pragma Assert (Result = 0);
906 if T.Known_Tasks_Index /= -1 then
907 Known_Tasks (T.Known_Tasks_Index) := null;
910 Free (T.Common.LL.Exc_Stack_Ptr);
922 procedure Exit_Task is
931 procedure Abort_Task (T : Task_Id) is
933 -- Interrupt Server_Tasks may be waiting on an event flag
935 if T.Common.State = Interrupt_Server_Blocked_On_Event_Flag then
936 Wakeup (T, Interrupt_Server_Blocked_On_Event_Flag);
944 procedure Initialize (S : in out Suspension_Object) is
945 Mutex_Attr : aliased pthread_mutexattr_t;
946 Cond_Attr : aliased pthread_condattr_t;
947 Result : Interfaces.C.int;
949 -- Initialize internal state (always to False (D.10 (6)))
954 -- Initialize internal mutex
956 Result := pthread_mutexattr_init (Mutex_Attr'Access);
957 pragma Assert (Result = 0 or else Result = ENOMEM);
959 if Result = ENOMEM then
963 Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access);
964 pragma Assert (Result = 0 or else Result = ENOMEM);
966 if Result = ENOMEM then
967 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
968 pragma Assert (Result = 0);
973 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
974 pragma Assert (Result = 0);
976 -- Initialize internal condition variable
978 Result := pthread_condattr_init (Cond_Attr'Access);
979 pragma Assert (Result = 0 or else Result = ENOMEM);
982 Result := pthread_mutex_destroy (S.L'Access);
983 pragma Assert (Result = 0);
985 if Result = ENOMEM then
990 Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access);
991 pragma Assert (Result = 0 or else Result = ENOMEM);
994 Result := pthread_mutex_destroy (S.L'Access);
995 pragma Assert (Result = 0);
997 if Result = ENOMEM then
998 Result := pthread_condattr_destroy (Cond_Attr'Access);
999 pragma Assert (Result = 0);
1001 raise Storage_Error;
1005 Result := pthread_condattr_destroy (Cond_Attr'Access);
1006 pragma Assert (Result = 0);
1013 procedure Finalize (S : in out Suspension_Object) is
1014 Result : Interfaces.C.int;
1017 -- Destroy internal mutex
1019 Result := pthread_mutex_destroy (S.L'Access);
1020 pragma Assert (Result = 0);
1022 -- Destroy internal condition variable
1024 Result := pthread_cond_destroy (S.CV'Access);
1025 pragma Assert (Result = 0);
1032 function Current_State (S : Suspension_Object) return Boolean is
1034 -- We do not want to use lock on this read operation. State is marked
1035 -- as Atomic so that we ensure that the value retrieved is correct.
1044 procedure Set_False (S : in out Suspension_Object) is
1045 Result : Interfaces.C.int;
1048 SSL.Abort_Defer.all;
1050 Result := pthread_mutex_lock (S.L'Access);
1051 pragma Assert (Result = 0);
1055 Result := pthread_mutex_unlock (S.L'Access);
1056 pragma Assert (Result = 0);
1058 SSL.Abort_Undefer.all;
1065 procedure Set_True (S : in out Suspension_Object) is
1066 Result : Interfaces.C.int;
1069 SSL.Abort_Defer.all;
1071 Result := pthread_mutex_lock (S.L'Access);
1072 pragma Assert (Result = 0);
1074 -- If there is already a task waiting on this suspension object then
1075 -- we resume it, leaving the state of the suspension object to False,
1076 -- as specified in (RM D.10(9)), otherwise leave state set to True.
1082 Result := pthread_cond_signal (S.CV'Access);
1083 pragma Assert (Result = 0);
1089 Result := pthread_mutex_unlock (S.L'Access);
1090 pragma Assert (Result = 0);
1092 SSL.Abort_Undefer.all;
1095 ------------------------
1096 -- Suspend_Until_True --
1097 ------------------------
1099 procedure Suspend_Until_True (S : in out Suspension_Object) is
1100 Result : Interfaces.C.int;
1103 SSL.Abort_Defer.all;
1105 Result := pthread_mutex_lock (S.L'Access);
1106 pragma Assert (Result = 0);
1110 -- Program_Error must be raised upon calling Suspend_Until_True
1111 -- if another task is already waiting on that suspension object
1114 Result := pthread_mutex_unlock (S.L'Access);
1115 pragma Assert (Result = 0);
1117 SSL.Abort_Undefer.all;
1119 raise Program_Error;
1122 -- Suspend the task if the state is False. Otherwise, the task
1123 -- continues its execution, and the state of the suspension object
1124 -- is set to False (ARM D.10 par. 9).
1130 Result := pthread_cond_wait (S.CV'Access, S.L'Access);
1133 Result := pthread_mutex_unlock (S.L'Access);
1134 pragma Assert (Result = 0);
1136 SSL.Abort_Undefer.all;
1138 end Suspend_Until_True;
1146 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
1147 pragma Unreferenced (Self_ID);
1152 --------------------
1153 -- Check_No_Locks --
1154 --------------------
1156 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
1157 pragma Unreferenced (Self_ID);
1162 ----------------------
1163 -- Environment_Task --
1164 ----------------------
1166 function Environment_Task return Task_Id is
1168 return Environment_Task_Id;
1169 end Environment_Task;
1175 procedure Lock_RTS is
1177 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
1184 procedure Unlock_RTS is
1186 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
1193 function Suspend_Task
1195 Thread_Self : Thread_Id) return Boolean
1197 pragma Unreferenced (T);
1198 pragma Unreferenced (Thread_Self);
1207 function Resume_Task
1209 Thread_Self : Thread_Id) return Boolean
1211 pragma Unreferenced (T);
1212 pragma Unreferenced (Thread_Self);
1217 --------------------
1218 -- Stop_All_Tasks --
1219 --------------------
1221 procedure Stop_All_Tasks is
1230 function Stop_Task (T : ST.Task_Id) return Boolean is
1231 pragma Unreferenced (T);
1240 function Continue_Task (T : ST.Task_Id) return Boolean is
1241 pragma Unreferenced (T);
1250 procedure Initialize (Environment_Task : Task_Id) is
1252 Environment_Task_Id := Environment_Task;
1254 SSL.Get_Exc_Stack_Addr := Get_Exc_Stack_Addr'Access;
1256 -- Initialize the lock used to synchronize chain of all ATCBs
1258 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1260 Specific.Initialize (Environment_Task);
1262 Enter_Task (Environment_Task);
1265 end System.Task_Primitives.Operations;