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) 1992-2009, 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 3, or (at your option) any later ver- --
14 -- sion. GNAT 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. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNARL was developed by the GNARL team at Florida State University. --
28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
30 ------------------------------------------------------------------------------
32 -- This is a OpenVMS/Alpha version of this package
34 -- This package contains all the GNULL primitives that interface directly with
38 -- Turn off polling, we do not want ATC polling to take place during tasking
39 -- operations. It causes infinite loops and other problems.
41 with Ada.Unchecked_Conversion;
42 with Ada.Unchecked_Deallocation;
46 with System.Tasking.Debug;
47 with System.OS_Primitives;
48 with System.Soft_Links;
51 package body System.Task_Primitives.Operations is
53 use System.Tasking.Debug;
56 use System.OS_Interface;
57 use System.Parameters;
58 use System.OS_Primitives;
59 use type System.OS_Primitives.OS_Time;
61 package SSL renames System.Soft_Links;
67 -- The followings are logically constants, but need to be initialized
70 Single_RTS_Lock : aliased RTS_Lock;
71 -- This is a lock to allow only one thread of control in the RTS at
72 -- a time; it is used to execute in mutual exclusion from all other tasks.
73 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
75 ATCB_Key : aliased pthread_key_t;
76 -- Key used to find the Ada Task_Id associated with a thread
78 Environment_Task_Id : Task_Id;
79 -- A variable to hold Task_Id for the environment task
81 Time_Slice_Val : Integer;
82 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
84 Dispatching_Policy : Character;
85 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
87 Foreign_Task_Elaborated : aliased Boolean := True;
88 -- Used to identified fake tasks (i.e., non-Ada Threads)
96 procedure Initialize (Environment_Task : Task_Id);
97 pragma Inline (Initialize);
98 -- Initialize various data needed by this package
100 function Is_Valid_Task return Boolean;
101 pragma Inline (Is_Valid_Task);
102 -- Does executing thread have a TCB?
104 procedure Set (Self_Id : Task_Id);
106 -- Set the self id for the current task
108 function Self return Task_Id;
109 pragma Inline (Self);
110 -- Return a pointer to the Ada Task Control Block of the calling task
114 package body Specific is separate;
115 -- The body of this package is target specific
117 ---------------------------------
118 -- Support for foreign threads --
119 ---------------------------------
121 function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
122 -- Allocate and Initialize a new ATCB for the current Thread
124 function Register_Foreign_Thread
125 (Thread : Thread_Id) return Task_Id is separate;
127 -----------------------
128 -- Local Subprograms --
129 -----------------------
131 function To_Task_Id is
132 new Ada.Unchecked_Conversion
133 (System.Task_Primitives.Task_Address, Task_Id);
135 function To_Address is
136 new Ada.Unchecked_Conversion
137 (Task_Id, System.Task_Primitives.Task_Address);
139 function Get_Exc_Stack_Addr return Address;
140 -- Replace System.Soft_Links.Get_Exc_Stack_Addr_NT
142 procedure Timer_Sleep_AST (ID : Address);
143 pragma Convention (C, Timer_Sleep_AST);
144 -- Signal the condition variable when AST fires
146 procedure Timer_Sleep_AST (ID : Address) is
147 Result : Interfaces.C.int;
148 pragma Warnings (Off, Result);
149 Self_ID : constant Task_Id := To_Task_Id (ID);
151 Self_ID.Common.LL.AST_Pending := False;
152 Result := pthread_cond_signal_int_np (Self_ID.Common.LL.CV'Access);
153 pragma Assert (Result = 0);
160 -- The underlying thread system sets a guard page at the bottom of a thread
161 -- stack, so nothing is needed.
162 -- ??? Check the comment above
164 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
165 pragma Unreferenced (T);
166 pragma Unreferenced (On);
175 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
177 return T.Common.LL.Thread;
184 function Self return Task_Id renames Specific.Self;
186 ---------------------
187 -- Initialize_Lock --
188 ---------------------
190 -- Note: mutexes and cond_variables needed per-task basis are initialized
191 -- in Initialize_TCB and the Storage_Error is handled. Other mutexes (such
192 -- as RTS_Lock, Memory_Lock...) used in RTS is initialized before any
193 -- status change of RTS. Therefore raising Storage_Error in the following
194 -- routines should be able to be handled safely.
196 procedure Initialize_Lock
197 (Prio : System.Any_Priority;
198 L : not null access Lock)
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
226 (L : not null access RTS_Lock;
229 pragma Unreferenced (Level);
231 Attributes : aliased pthread_mutexattr_t;
232 Result : Interfaces.C.int;
235 Result := pthread_mutexattr_init (Attributes'Access);
236 pragma Assert (Result = 0 or else Result = ENOMEM);
238 if Result = ENOMEM then
242 -- Don't use, see comment in s-osinte.ads about ERRORCHECK mutexes???
243 -- Result := pthread_mutexattr_settype_np
244 -- (Attributes'Access, PTHREAD_MUTEX_ERRORCHECK_NP);
245 -- pragma Assert (Result = 0);
247 -- Result := pthread_mutexattr_setprotocol
248 -- (Attributes'Access, PTHREAD_PRIO_PROTECT);
249 -- pragma Assert (Result = 0);
251 -- Result := pthread_mutexattr_setprioceiling
252 -- (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
253 -- pragma Assert (Result = 0);
255 Result := pthread_mutex_init (L, Attributes'Access);
257 pragma Assert (Result = 0 or else Result = ENOMEM);
259 if Result = ENOMEM then
263 Result := pthread_mutexattr_destroy (Attributes'Access);
264 pragma Assert (Result = 0);
271 procedure Finalize_Lock (L : not null access Lock) is
272 Result : Interfaces.C.int;
274 Result := pthread_mutex_destroy (L.L'Access);
275 pragma Assert (Result = 0);
278 procedure Finalize_Lock (L : not null access RTS_Lock) is
279 Result : Interfaces.C.int;
281 Result := pthread_mutex_destroy (L);
282 pragma Assert (Result = 0);
290 (L : not null access Lock;
291 Ceiling_Violation : out Boolean)
293 Self_ID : constant Task_Id := Self;
294 All_Tasks_Link : constant Task_Id := Self.Common.All_Tasks_Link;
295 Current_Prio : System.Any_Priority;
296 Result : Interfaces.C.int;
299 Current_Prio := Get_Priority (Self_ID);
301 -- If there is no other tasks, no need to check priorities
303 if All_Tasks_Link /= Null_Task
304 and then L.Prio < Interfaces.C.int (Current_Prio)
306 Ceiling_Violation := True;
310 Result := pthread_mutex_lock (L.L'Access);
311 pragma Assert (Result = 0);
313 Ceiling_Violation := False;
314 -- Why is this commented out ???
315 -- L.Prio_Save := Interfaces.C.int (Current_Prio);
316 -- Set_Priority (Self_ID, System.Any_Priority (L.Prio));
320 (L : not null access RTS_Lock;
321 Global_Lock : Boolean := False)
323 Result : Interfaces.C.int;
325 if not Single_Lock or else Global_Lock then
326 Result := pthread_mutex_lock (L);
327 pragma Assert (Result = 0);
331 procedure Write_Lock (T : Task_Id) is
332 Result : Interfaces.C.int;
334 if not Single_Lock then
335 Result := pthread_mutex_lock (T.Common.LL.L'Access);
336 pragma Assert (Result = 0);
345 (L : not null access Lock;
346 Ceiling_Violation : out Boolean)
349 Write_Lock (L, Ceiling_Violation);
356 procedure Unlock (L : not null access Lock) is
357 Result : Interfaces.C.int;
359 Result := pthread_mutex_unlock (L.L'Access);
360 pragma Assert (Result = 0);
364 (L : not null access RTS_Lock;
365 Global_Lock : Boolean := False)
367 Result : Interfaces.C.int;
369 if not Single_Lock or else Global_Lock then
370 Result := pthread_mutex_unlock (L);
371 pragma Assert (Result = 0);
375 procedure Unlock (T : Task_Id) is
376 Result : Interfaces.C.int;
378 if not Single_Lock then
379 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
380 pragma Assert (Result = 0);
388 -- Dynamic priority ceilings are not supported by the underlying system
390 procedure Set_Ceiling
391 (L : not null access Lock;
392 Prio : System.Any_Priority)
394 pragma Unreferenced (L, Prio);
405 Reason : System.Tasking.Task_States)
407 pragma Unreferenced (Reason);
408 Result : Interfaces.C.int;
413 (cond => Self_ID.Common.LL.CV'Access,
414 mutex => (if Single_Lock
415 then Single_RTS_Lock'Access
416 else Self_ID.Common.LL.L'Access));
418 -- EINTR is not considered a failure
420 pragma Assert (Result = 0 or else Result = EINTR);
422 if Self_ID.Deferral_Level = 0
423 and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
426 raise Standard'Abort_Signal;
434 procedure Timed_Sleep
437 Mode : ST.Delay_Modes;
438 Reason : System.Tasking.Task_States;
439 Timedout : out Boolean;
440 Yielded : out Boolean)
442 pragma Unreferenced (Reason);
444 Sleep_Time : OS_Time;
445 Result : Interfaces.C.int;
446 Status : Cond_Value_Type;
448 -- The body below requires more comments ???
454 Sleep_Time := To_OS_Time (Time, Mode);
456 if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
460 Self_ID.Common.LL.AST_Pending := True;
463 (Status, 0, Sleep_Time,
464 Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
466 if (Status and 1) /= 1 then
473 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
474 pragma Assert (Result = 0);
479 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
480 pragma Assert (Result = 0);
485 if not Self_ID.Common.LL.AST_Pending then
488 Sys_Cantim (Status, To_Address (Self_ID), 0);
489 pragma Assert ((Status and 1) = 1);
497 procedure Timed_Delay
500 Mode : ST.Delay_Modes)
502 Sleep_Time : OS_Time;
503 Result : Interfaces.C.int;
504 Status : Cond_Value_Type;
505 Yielded : Boolean := False;
512 -- More comments required in body below ???
514 Write_Lock (Self_ID);
516 if Time /= 0.0 or else Mode /= Relative then
517 Sleep_Time := To_OS_Time (Time, Mode);
519 if Mode = Relative or else OS_Clock <= Sleep_Time then
520 Self_ID.Common.State := Delay_Sleep;
521 Self_ID.Common.LL.AST_Pending := True;
524 (Status, 0, Sleep_Time,
525 Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
527 -- Comment following test
529 if (Status and 1) /= 1 then
534 if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
535 Sys_Cantim (Status, To_Address (Self_ID), 0);
536 pragma Assert ((Status and 1) = 1);
542 (cond => Self_ID.Common.LL.CV'Access,
543 mutex => (if Single_Lock
544 then Single_RTS_Lock'Access
545 else Self_ID.Common.LL.L'Access));
546 pragma Assert (Result = 0);
550 exit when not Self_ID.Common.LL.AST_Pending;
553 Self_ID.Common.State := Runnable;
564 Result := sched_yield;
565 pragma Assert (Result = 0);
569 ---------------------
570 -- Monotonic_Clock --
571 ---------------------
573 function Monotonic_Clock return Duration
574 renames System.OS_Primitives.Monotonic_Clock;
580 function RT_Resolution return Duration is
582 -- Document origin of this magic constant ???
590 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
591 pragma Unreferenced (Reason);
592 Result : Interfaces.C.int;
594 Result := pthread_cond_signal (T.Common.LL.CV'Access);
595 pragma Assert (Result = 0);
602 procedure Yield (Do_Yield : Boolean := True) is
603 Result : Interfaces.C.int;
604 pragma Unreferenced (Result);
607 Result := sched_yield;
615 procedure Set_Priority
617 Prio : System.Any_Priority;
618 Loss_Of_Inheritance : Boolean := False)
620 pragma Unreferenced (Loss_Of_Inheritance);
622 Result : Interfaces.C.int;
623 Param : aliased struct_sched_param;
625 function Get_Policy (Prio : System.Any_Priority) return Character;
626 pragma Import (C, Get_Policy, "__gnat_get_specific_dispatching");
627 -- Get priority specific dispatching policy
629 Priority_Specific_Policy : constant Character := Get_Policy (Prio);
630 -- Upper case first character of the policy name corresponding to the
631 -- task as set by a Priority_Specific_Dispatching pragma.
634 T.Common.Current_Priority := Prio;
635 Param.sched_priority := Interfaces.C.int (Underlying_Priorities (Prio));
637 if Dispatching_Policy = 'R'
638 or else Priority_Specific_Policy = 'R'
639 or else Time_Slice_Val > 0
642 pthread_setschedparam
643 (T.Common.LL.Thread, SCHED_RR, Param'Access);
645 elsif Dispatching_Policy = 'F'
646 or else Priority_Specific_Policy = 'F'
647 or else Time_Slice_Val = 0
650 pthread_setschedparam
651 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
654 -- SCHED_OTHER priorities are restricted to the range 8 - 15.
655 -- Since the translation from Underlying priorities results
656 -- in a range of 16 - 31, dividing by 2 gives the correct result.
658 Param.sched_priority := Param.sched_priority / 2;
660 pthread_setschedparam
661 (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
664 pragma Assert (Result = 0);
671 function Get_Priority (T : Task_Id) return System.Any_Priority is
673 return T.Common.Current_Priority;
680 procedure Enter_Task (Self_ID : Task_Id) is
682 Self_ID.Common.LL.Thread := pthread_self;
683 Specific.Set (Self_ID);
690 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
692 return new Ada_Task_Control_Block (Entry_Num);
699 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
701 -----------------------------
702 -- Register_Foreign_Thread --
703 -----------------------------
705 function Register_Foreign_Thread return Task_Id is
707 if Is_Valid_Task then
710 return Register_Foreign_Thread (pthread_self);
712 end Register_Foreign_Thread;
718 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
719 Mutex_Attr : aliased pthread_mutexattr_t;
720 Result : Interfaces.C.int;
721 Cond_Attr : aliased pthread_condattr_t;
724 -- More comments required in body below ???
726 if not Single_Lock then
727 Result := pthread_mutexattr_init (Mutex_Attr'Access);
728 pragma Assert (Result = 0 or else Result = ENOMEM);
733 (Self_ID.Common.LL.L'Access, Mutex_Attr'Access);
734 pragma Assert (Result = 0 or else Result = ENOMEM);
742 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
743 pragma Assert (Result = 0);
746 Result := pthread_condattr_init (Cond_Attr'Access);
747 pragma Assert (Result = 0 or else Result = ENOMEM);
752 (Self_ID.Common.LL.CV'Access, Cond_Attr'Access);
753 pragma Assert (Result = 0 or else Result = ENOMEM);
758 Self_ID.Common.LL.Exc_Stack_Ptr := new Exc_Stack_T;
761 if not Single_Lock then
762 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
763 pragma Assert (Result = 0);
769 Result := pthread_condattr_destroy (Cond_Attr'Access);
770 pragma Assert (Result = 0);
773 ------------------------
774 -- Get_Exc_Stack_Addr --
775 ------------------------
777 function Get_Exc_Stack_Addr return Address is
779 return Self.Common.LL.Exc_Stack_Ptr (Exc_Stack_T'Last)'Address;
780 end Get_Exc_Stack_Addr;
786 procedure Create_Task
788 Wrapper : System.Address;
789 Stack_Size : System.Parameters.Size_Type;
790 Priority : System.Any_Priority;
791 Succeeded : out Boolean)
793 Attributes : aliased pthread_attr_t;
794 Result : Interfaces.C.int;
796 function Thread_Body_Access is new
797 Ada.Unchecked_Conversion (System.Aux_DEC.Short_Address, Thread_Body);
800 -- Since the initial signal mask of a thread is inherited from the
801 -- creator, we need to set our local signal mask to mask all signals
802 -- during the creation operation, to make sure the new thread is
803 -- not disturbed by signals before it has set its own Task_Id.
805 Result := pthread_attr_init (Attributes'Access);
806 pragma Assert (Result = 0 or else Result = ENOMEM);
813 Result := pthread_attr_setdetachstate
814 (Attributes'Access, PTHREAD_CREATE_DETACHED);
815 pragma Assert (Result = 0);
817 Result := pthread_attr_setstacksize
818 (Attributes'Access, Interfaces.C.size_t (Stack_Size));
819 pragma Assert (Result = 0);
821 -- This call may be unnecessary, not sure. ???
824 pthread_attr_setinheritsched
825 (Attributes'Access, PTHREAD_EXPLICIT_SCHED);
826 pragma Assert (Result = 0);
830 (T.Common.LL.Thread'Access,
832 Thread_Body_Access (Wrapper),
835 -- ENOMEM is a valid run-time error -- do not shut down
837 pragma Assert (Result = 0
838 or else Result = EAGAIN or else Result = ENOMEM);
840 Succeeded := Result = 0;
842 Result := pthread_attr_destroy (Attributes'Access);
843 pragma Assert (Result = 0);
846 Set_Priority (T, Priority);
854 procedure Finalize_TCB (T : Task_Id) is
855 Result : Interfaces.C.int;
857 Is_Self : constant Boolean := T = Self;
859 procedure Free is new
860 Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
862 procedure Free is new Ada.Unchecked_Deallocation
863 (Exc_Stack_T, Exc_Stack_Ptr_T);
866 if not Single_Lock then
867 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
868 pragma Assert (Result = 0);
871 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
872 pragma Assert (Result = 0);
874 if T.Known_Tasks_Index /= -1 then
875 Known_Tasks (T.Known_Tasks_Index) := null;
878 Free (T.Common.LL.Exc_Stack_Ptr);
890 procedure Exit_Task is
899 procedure Abort_Task (T : Task_Id) is
901 -- Interrupt Server_Tasks may be waiting on an event flag
903 if T.Common.State = Interrupt_Server_Blocked_On_Event_Flag then
904 Wakeup (T, Interrupt_Server_Blocked_On_Event_Flag);
912 procedure Initialize (S : in out Suspension_Object) is
913 Mutex_Attr : aliased pthread_mutexattr_t;
914 Cond_Attr : aliased pthread_condattr_t;
915 Result : Interfaces.C.int;
917 -- Initialize internal state (always to False (D.10 (6)))
922 -- Initialize internal mutex
924 Result := pthread_mutexattr_init (Mutex_Attr'Access);
925 pragma Assert (Result = 0 or else Result = ENOMEM);
927 if Result = ENOMEM then
931 Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access);
932 pragma Assert (Result = 0 or else Result = ENOMEM);
934 if Result = ENOMEM then
935 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
936 pragma Assert (Result = 0);
941 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
942 pragma Assert (Result = 0);
944 -- Initialize internal condition variable
946 Result := pthread_condattr_init (Cond_Attr'Access);
947 pragma Assert (Result = 0 or else Result = ENOMEM);
950 Result := pthread_mutex_destroy (S.L'Access);
951 pragma Assert (Result = 0);
953 if Result = ENOMEM then
958 Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access);
959 pragma Assert (Result = 0 or else Result = ENOMEM);
962 Result := pthread_mutex_destroy (S.L'Access);
963 pragma Assert (Result = 0);
965 if Result = ENOMEM then
966 Result := pthread_condattr_destroy (Cond_Attr'Access);
967 pragma Assert (Result = 0);
973 Result := pthread_condattr_destroy (Cond_Attr'Access);
974 pragma Assert (Result = 0);
981 procedure Finalize (S : in out Suspension_Object) is
982 Result : Interfaces.C.int;
985 -- Destroy internal mutex
987 Result := pthread_mutex_destroy (S.L'Access);
988 pragma Assert (Result = 0);
990 -- Destroy internal condition variable
992 Result := pthread_cond_destroy (S.CV'Access);
993 pragma Assert (Result = 0);
1000 function Current_State (S : Suspension_Object) return Boolean is
1002 -- We do not want to use lock on this read operation. State is marked
1003 -- as Atomic so that we ensure that the value retrieved is correct.
1012 procedure Set_False (S : in out Suspension_Object) is
1013 Result : Interfaces.C.int;
1016 SSL.Abort_Defer.all;
1018 Result := pthread_mutex_lock (S.L'Access);
1019 pragma Assert (Result = 0);
1023 Result := pthread_mutex_unlock (S.L'Access);
1024 pragma Assert (Result = 0);
1026 SSL.Abort_Undefer.all;
1033 procedure Set_True (S : in out Suspension_Object) is
1034 Result : Interfaces.C.int;
1037 SSL.Abort_Defer.all;
1039 Result := pthread_mutex_lock (S.L'Access);
1040 pragma Assert (Result = 0);
1042 -- If there is already a task waiting on this suspension object then
1043 -- we resume it, leaving the state of the suspension object to False,
1044 -- as specified in (RM D.10(9)), otherwise leave state set to True.
1050 Result := pthread_cond_signal (S.CV'Access);
1051 pragma Assert (Result = 0);
1057 Result := pthread_mutex_unlock (S.L'Access);
1058 pragma Assert (Result = 0);
1060 SSL.Abort_Undefer.all;
1063 ------------------------
1064 -- Suspend_Until_True --
1065 ------------------------
1067 procedure Suspend_Until_True (S : in out Suspension_Object) is
1068 Result : Interfaces.C.int;
1071 SSL.Abort_Defer.all;
1073 Result := pthread_mutex_lock (S.L'Access);
1074 pragma Assert (Result = 0);
1078 -- Program_Error must be raised upon calling Suspend_Until_True
1079 -- if another task is already waiting on that suspension object
1082 Result := pthread_mutex_unlock (S.L'Access);
1083 pragma Assert (Result = 0);
1085 SSL.Abort_Undefer.all;
1087 raise Program_Error;
1090 -- Suspend the task if the state is False. Otherwise, the task
1091 -- continues its execution, and the state of the suspension object
1092 -- is set to False (ARM D.10 par. 9).
1100 -- Loop in case pthread_cond_wait returns earlier than expected
1101 -- (e.g. in case of EINTR caused by a signal).
1103 Result := pthread_cond_wait (S.CV'Access, S.L'Access);
1104 pragma Assert (Result = 0 or else Result = EINTR);
1106 exit when not S.Waiting;
1110 Result := pthread_mutex_unlock (S.L'Access);
1111 pragma Assert (Result = 0);
1113 SSL.Abort_Undefer.all;
1115 end Suspend_Until_True;
1123 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
1124 pragma Unreferenced (Self_ID);
1129 --------------------
1130 -- Check_No_Locks --
1131 --------------------
1133 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
1134 pragma Unreferenced (Self_ID);
1139 ----------------------
1140 -- Environment_Task --
1141 ----------------------
1143 function Environment_Task return Task_Id is
1145 return Environment_Task_Id;
1146 end Environment_Task;
1152 procedure Lock_RTS is
1154 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
1161 procedure Unlock_RTS is
1163 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
1170 function Suspend_Task
1172 Thread_Self : Thread_Id) return Boolean
1174 pragma Unreferenced (T);
1175 pragma Unreferenced (Thread_Self);
1184 function Resume_Task
1186 Thread_Self : Thread_Id) return Boolean
1188 pragma Unreferenced (T);
1189 pragma Unreferenced (Thread_Self);
1194 --------------------
1195 -- Stop_All_Tasks --
1196 --------------------
1198 procedure Stop_All_Tasks is
1207 function Stop_Task (T : ST.Task_Id) return Boolean is
1208 pragma Unreferenced (T);
1217 function Continue_Task (T : ST.Task_Id) return Boolean is
1218 pragma Unreferenced (T);
1227 procedure Initialize (Environment_Task : Task_Id) is
1229 -- The DEC Ada facility code defined in Starlet
1230 Ada_Facility : constant := 49;
1232 function DBGEXT (Control_Block : System.Address)
1233 return System.Aux_DEC.Unsigned_Word;
1234 -- DBGEXT is imported from s-tasdeb.adb and its parameter re-typed
1235 -- as Address to avoid having a VMS specific s-tasdeb.ads.
1236 pragma Interface (C, DBGEXT);
1237 pragma Import_Function (DBGEXT, "GNAT$DBGEXT");
1239 type Facility_Type is range 0 .. 65535;
1241 procedure Debug_Register
1242 (ADBGEXT : System.Address;
1243 ATCB_Key : pthread_key_t;
1244 Facility : Facility_Type;
1245 Std_Prolog : Integer);
1246 pragma Import (C, Debug_Register, "CMA$DEBUG_REGISTER");
1248 Environment_Task_Id := Environment_Task;
1250 SSL.Get_Exc_Stack_Addr := Get_Exc_Stack_Addr'Access;
1252 -- Initialize the lock used to synchronize chain of all ATCBs
1254 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1256 Specific.Initialize (Environment_Task);
1258 -- Pass the context key on to CMA along with the other parameters
1261 DBGEXT'Address, -- Our DEBUG handling entry point
1262 ATCB_Key, -- CMA context key for our Ada TCB's
1263 Ada_Facility, -- Out facility code
1264 0 -- False, we don't have the std TCB prolog
1267 -- Make environment task known here because it doesn't go through
1268 -- Activate_Tasks, which does it for all other tasks.
1270 Known_Tasks (Known_Tasks'First) := Environment_Task;
1271 Environment_Task.Known_Tasks_Index := Known_Tasks'First;
1273 Enter_Task (Environment_Task);
1276 end System.Task_Primitives.Operations;