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 HP-UX DCE threads (HPUX 10) 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.Interrupt_Management;
47 -- used for Keep_Unmasked
48 -- Abort_Task_Interrupt
51 pragma Warnings (Off);
52 with System.Interrupt_Management.Operations;
53 -- used for Set_Interrupt_Mask
55 pragma Elaborate_All (System.Interrupt_Management.Operations);
59 with System.OS_Primitives;
60 -- used for Delay_Modes
66 with System.Task_Primitives.Interrupt_Operations;
67 -- used for Get_Interrupt_ID
69 with System.Soft_Links;
70 -- used for Defer/Undefer_Abort
72 -- We use System.Soft_Links instead of System.Tasking.Initialization
73 -- because the later is a higher level package that we shouldn't depend on.
74 -- For example when using the restricted run time, it is replaced by
75 -- System.Tasking.Restricted.Stages.
77 with Unchecked_Conversion;
78 with Unchecked_Deallocation;
80 package body System.Task_Primitives.Operations is
82 package SSL renames System.Soft_Links;
84 use System.Tasking.Debug;
87 use System.OS_Interface;
88 use System.Parameters;
89 use System.OS_Primitives;
91 package PIO renames System.Task_Primitives.Interrupt_Operations;
97 -- The followings are logically constants, but need to be initialized
100 Single_RTS_Lock : aliased RTS_Lock;
101 -- This is a lock to allow only one thread of control in the RTS at
102 -- a time; it is used to execute in mutual exclusion from all other tasks.
103 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
105 ATCB_Key : aliased pthread_key_t;
106 -- Key used to find the Ada Task_Id associated with a thread
108 Environment_Task_Id : Task_Id;
109 -- A variable to hold Task_Id for the environment task
111 Unblocked_Signal_Mask : aliased sigset_t;
112 -- The set of signals that should unblocked in all tasks
114 Time_Slice_Val : Integer;
115 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
117 Dispatching_Policy : Character;
118 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
120 -- Note: the reason that Locking_Policy is not needed is that this
121 -- is not implemented for DCE threads. The HPUX 10 port is at this
122 -- stage considered dead, and no further work is planned on it.
124 Foreign_Task_Elaborated : aliased Boolean := True;
125 -- Used to identified fake tasks (i.e., non-Ada Threads)
133 procedure Initialize (Environment_Task : Task_Id);
134 pragma Inline (Initialize);
135 -- Initialize various data needed by this package
137 function Is_Valid_Task return Boolean;
138 pragma Inline (Is_Valid_Task);
139 -- Does the executing thread have a TCB?
141 procedure Set (Self_Id : Task_Id);
143 -- Set the self id for the current task
145 function Self return Task_Id;
146 pragma Inline (Self);
147 -- Return a pointer to the Ada Task Control Block of the calling task
151 package body Specific is separate;
152 -- The body of this package is target specific
154 ---------------------------------
155 -- Support for foreign threads --
156 ---------------------------------
158 function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
159 -- Allocate and Initialize a new ATCB for the current Thread
161 function Register_Foreign_Thread
162 (Thread : Thread_Id) return Task_Id is separate;
164 -----------------------
165 -- Local Subprograms --
166 -----------------------
168 procedure Abort_Handler (Sig : Signal);
170 function To_Address is new Unchecked_Conversion (Task_Id, System.Address);
176 procedure Abort_Handler (Sig : Signal) is
177 pragma Unreferenced (Sig);
179 Self_Id : constant Task_Id := Self;
180 Result : Interfaces.C.int;
181 Old_Set : aliased sigset_t;
184 if Self_Id.Deferral_Level = 0
185 and then Self_Id.Pending_ATC_Level < Self_Id.ATC_Nesting_Level and then
188 Self_Id.Aborting := True;
190 -- Make sure signals used for RTS internal purpose are unmasked
192 Result := pthread_sigmask (SIG_UNBLOCK,
193 Unblocked_Signal_Mask'Unchecked_Access, Old_Set'Unchecked_Access);
194 pragma Assert (Result = 0);
196 raise Standard'Abort_Signal;
204 -- The underlying thread system sets a guard page at the
205 -- bottom of a thread stack, so nothing is needed.
206 -- ??? Check the comment above
208 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
209 pragma Unreferenced (T, On);
218 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
220 return T.Common.LL.Thread;
227 function Self return Task_Id renames Specific.Self;
229 ---------------------
230 -- Initialize_Lock --
231 ---------------------
233 -- Note: mutexes and cond_variables needed per-task basis are
234 -- initialized in Initialize_TCB and the Storage_Error is
235 -- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
236 -- used in RTS is initialized before any status change of RTS.
237 -- Therefore rasing Storage_Error in the following routines
238 -- should be able to be handled safely.
240 procedure Initialize_Lock
241 (Prio : System.Any_Priority;
244 Attributes : aliased pthread_mutexattr_t;
245 Result : Interfaces.C.int;
248 Result := pthread_mutexattr_init (Attributes'Access);
249 pragma Assert (Result = 0 or else Result = ENOMEM);
251 if Result = ENOMEM then
257 Result := pthread_mutex_init (L.L'Access, Attributes'Access);
258 pragma Assert (Result = 0 or else Result = ENOMEM);
260 if Result = ENOMEM then
264 Result := pthread_mutexattr_destroy (Attributes'Access);
265 pragma Assert (Result = 0);
268 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
269 pragma Unreferenced (Level);
271 Attributes : aliased pthread_mutexattr_t;
272 Result : Interfaces.C.int;
275 Result := pthread_mutexattr_init (Attributes'Access);
276 pragma Assert (Result = 0 or else Result = ENOMEM);
278 if Result = ENOMEM then
282 Result := pthread_mutex_init (L, Attributes'Access);
284 pragma Assert (Result = 0 or else Result = ENOMEM);
286 if Result = ENOMEM then
290 Result := pthread_mutexattr_destroy (Attributes'Access);
291 pragma Assert (Result = 0);
298 procedure Finalize_Lock (L : access Lock) is
299 Result : Interfaces.C.int;
301 Result := pthread_mutex_destroy (L.L'Access);
302 pragma Assert (Result = 0);
305 procedure Finalize_Lock (L : access RTS_Lock) is
306 Result : Interfaces.C.int;
308 Result := pthread_mutex_destroy (L);
309 pragma Assert (Result = 0);
316 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
317 Result : Interfaces.C.int;
320 L.Owner_Priority := Get_Priority (Self);
322 if L.Priority < L.Owner_Priority then
323 Ceiling_Violation := True;
327 Result := pthread_mutex_lock (L.L'Access);
328 pragma Assert (Result = 0);
329 Ceiling_Violation := False;
333 (L : access RTS_Lock; Global_Lock : Boolean := False)
335 Result : Interfaces.C.int;
337 if not Single_Lock or else Global_Lock then
338 Result := pthread_mutex_lock (L);
339 pragma Assert (Result = 0);
343 procedure Write_Lock (T : Task_Id) is
344 Result : Interfaces.C.int;
346 if not Single_Lock then
347 Result := pthread_mutex_lock (T.Common.LL.L'Access);
348 pragma Assert (Result = 0);
356 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
358 Write_Lock (L, Ceiling_Violation);
365 procedure Unlock (L : access Lock) is
366 Result : Interfaces.C.int;
368 Result := pthread_mutex_unlock (L.L'Access);
369 pragma Assert (Result = 0);
372 procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
373 Result : Interfaces.C.int;
375 if not Single_Lock or else Global_Lock then
376 Result := pthread_mutex_unlock (L);
377 pragma Assert (Result = 0);
381 procedure Unlock (T : Task_Id) is
382 Result : Interfaces.C.int;
384 if not Single_Lock then
385 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
386 pragma Assert (Result = 0);
396 Reason : System.Tasking.Task_States)
398 pragma Unreferenced (Reason);
400 Result : Interfaces.C.int;
403 Result := pthread_cond_wait
404 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
406 Result := pthread_cond_wait
407 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
410 -- EINTR is not considered a failure
412 pragma Assert (Result = 0 or else Result = EINTR);
419 procedure Timed_Sleep
422 Mode : ST.Delay_Modes;
423 Reason : System.Tasking.Task_States;
424 Timedout : out Boolean;
425 Yielded : out Boolean)
427 pragma Unreferenced (Reason);
429 Check_Time : constant Duration := Monotonic_Clock;
431 Request : aliased timespec;
432 Result : Interfaces.C.int;
438 if Mode = Relative then
439 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
441 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
444 if Abs_Time > Check_Time then
445 Request := To_Timespec (Abs_Time);
448 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
449 or else Self_ID.Pending_Priority_Change;
452 Result := pthread_cond_timedwait
453 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access,
457 Result := pthread_cond_timedwait
458 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
462 exit when Abs_Time <= Monotonic_Clock;
464 if Result = 0 or Result = EINTR then
466 -- Somebody may have called Wakeup for us
472 pragma Assert (Result = ETIMEDOUT);
481 procedure Timed_Delay
484 Mode : ST.Delay_Modes)
486 Check_Time : constant Duration := Monotonic_Clock;
488 Request : aliased timespec;
490 Result : Interfaces.C.int;
491 pragma Warnings (Off, Result);
498 Write_Lock (Self_ID);
500 if Mode = Relative then
501 Abs_Time := Time + Check_Time;
503 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
506 if Abs_Time > Check_Time then
507 Request := To_Timespec (Abs_Time);
508 Self_ID.Common.State := Delay_Sleep;
511 if Self_ID.Pending_Priority_Change then
512 Self_ID.Pending_Priority_Change := False;
513 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
514 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
517 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
520 Result := pthread_cond_timedwait
521 (Self_ID.Common.LL.CV'Access,
522 Single_RTS_Lock'Access,
525 Result := pthread_cond_timedwait
526 (Self_ID.Common.LL.CV'Access,
527 Self_ID.Common.LL.L'Access,
531 exit when Abs_Time <= Monotonic_Clock;
533 pragma Assert (Result = 0 or else
534 Result = ETIMEDOUT or else
538 Self_ID.Common.State := Runnable;
547 Result := sched_yield;
550 ---------------------
551 -- Monotonic_Clock --
552 ---------------------
554 function Monotonic_Clock return Duration is
555 TS : aliased timespec;
556 Result : Interfaces.C.int;
558 Result := Clock_Gettime (CLOCK_REALTIME, TS'Unchecked_Access);
559 pragma Assert (Result = 0);
560 return To_Duration (TS);
567 function RT_Resolution return Duration is
576 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
577 pragma Unreferenced (Reason);
579 Result : Interfaces.C.int;
582 Result := pthread_cond_signal (T.Common.LL.CV'Access);
583 pragma Assert (Result = 0);
590 procedure Yield (Do_Yield : Boolean := True) is
591 Result : Interfaces.C.int;
592 pragma Unreferenced (Result);
595 Result := sched_yield;
603 type Prio_Array_Type is array (System.Any_Priority) of Integer;
604 pragma Atomic_Components (Prio_Array_Type);
606 Prio_Array : Prio_Array_Type;
607 -- Global array containing the id of the currently running task for
610 -- Note: we assume that we are on a single processor with run-til-blocked
613 procedure Set_Priority
615 Prio : System.Any_Priority;
616 Loss_Of_Inheritance : Boolean := False)
618 Result : Interfaces.C.int;
619 Array_Item : Integer;
620 Param : aliased struct_sched_param;
622 function Get_Policy (Prio : System.Any_Priority) return Character;
623 pragma Import (C, Get_Policy, "__gnat_get_specific_dispatching");
624 -- Get priority specific dispatching policy
626 Priority_Specific_Policy : constant Character := Get_Policy (Prio);
627 -- Upper case first character of the policy name corresponding to the
628 -- task as set by a Priority_Specific_Dispatching pragma.
631 Param.sched_priority := Interfaces.C.int (Underlying_Priorities (Prio));
633 if Dispatching_Policy = 'R'
634 or else Priority_Specific_Policy = 'R'
635 or else Time_Slice_Val > 0
637 Result := pthread_setschedparam
638 (T.Common.LL.Thread, SCHED_RR, Param'Access);
640 elsif Dispatching_Policy = 'F'
641 or else Priority_Specific_Policy = 'F'
642 or else Time_Slice_Val = 0
644 Result := pthread_setschedparam
645 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
648 Result := pthread_setschedparam
649 (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
652 pragma Assert (Result = 0);
654 if Dispatching_Policy = 'F' or else Priority_Specific_Policy = 'F' then
656 -- Annex D requirement [RM D.2.2 par. 9]:
657 -- If the task drops its priority due to the loss of inherited
658 -- priority, it is added at the head of the ready queue for its
659 -- new active priority.
661 if Loss_Of_Inheritance
662 and then Prio < T.Common.Current_Priority
664 Array_Item := Prio_Array (T.Common.Base_Priority) + 1;
665 Prio_Array (T.Common.Base_Priority) := Array_Item;
668 -- Let some processes a chance to arrive
672 -- Then wait for our turn to proceed
674 exit when Array_Item = Prio_Array (T.Common.Base_Priority)
675 or else Prio_Array (T.Common.Base_Priority) = 1;
678 Prio_Array (T.Common.Base_Priority) :=
679 Prio_Array (T.Common.Base_Priority) - 1;
683 T.Common.Current_Priority := Prio;
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;
702 Specific.Set (Self_ID);
706 for J in Known_Tasks'Range loop
707 if Known_Tasks (J) = null then
708 Known_Tasks (J) := Self_ID;
709 Self_ID.Known_Tasks_Index := J;
721 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
723 return new Ada_Task_Control_Block (Entry_Num);
730 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
732 -----------------------------
733 -- Register_Foreign_Thread --
734 -----------------------------
736 function Register_Foreign_Thread return Task_Id is
738 if Is_Valid_Task then
741 return Register_Foreign_Thread (pthread_self);
743 end Register_Foreign_Thread;
749 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
750 Mutex_Attr : aliased pthread_mutexattr_t;
751 Result : Interfaces.C.int;
752 Cond_Attr : aliased pthread_condattr_t;
755 if not Single_Lock then
756 Result := pthread_mutexattr_init (Mutex_Attr'Access);
757 pragma Assert (Result = 0 or else Result = ENOMEM);
760 Result := pthread_mutex_init (Self_ID.Common.LL.L'Access,
762 pragma Assert (Result = 0 or else Result = ENOMEM);
770 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
771 pragma Assert (Result = 0);
774 Result := pthread_condattr_init (Cond_Attr'Access);
775 pragma Assert (Result = 0 or else Result = ENOMEM);
778 Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
780 pragma Assert (Result = 0 or else Result = ENOMEM);
786 if not Single_Lock then
787 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
788 pragma Assert (Result = 0);
794 Result := pthread_condattr_destroy (Cond_Attr'Access);
795 pragma Assert (Result = 0);
802 procedure Create_Task
804 Wrapper : System.Address;
805 Stack_Size : System.Parameters.Size_Type;
806 Priority : System.Any_Priority;
807 Succeeded : out Boolean)
809 Attributes : aliased pthread_attr_t;
810 Result : Interfaces.C.int;
812 function Thread_Body_Access is new
813 Unchecked_Conversion (System.Address, Thread_Body);
816 Result := pthread_attr_init (Attributes'Access);
817 pragma Assert (Result = 0 or else Result = ENOMEM);
824 Result := pthread_attr_setstacksize
825 (Attributes'Access, Interfaces.C.size_t (Stack_Size));
826 pragma Assert (Result = 0);
828 -- Since the initial signal mask of a thread is inherited from the
829 -- creator, and the Environment task has all its signals masked, we
830 -- do not need to manipulate caller's signal mask at this point.
831 -- All tasks in RTS will have All_Tasks_Mask initially.
833 Result := pthread_create
834 (T.Common.LL.Thread'Access,
836 Thread_Body_Access (Wrapper),
838 pragma Assert (Result = 0 or else Result = EAGAIN);
840 Succeeded := Result = 0;
842 pthread_detach (T.Common.LL.Thread'Access);
843 -- Detach the thread using pthread_detach, sinc DCE threads do not have
844 -- pthread_attr_set_detachstate.
846 Result := pthread_attr_destroy (Attributes'Access);
847 pragma Assert (Result = 0);
849 Set_Priority (T, Priority);
856 procedure Finalize_TCB (T : Task_Id) is
857 Result : Interfaces.C.int;
859 Is_Self : constant Boolean := T = Self;
861 procedure Free is new
862 Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
865 if not Single_Lock then
866 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
867 pragma Assert (Result = 0);
870 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
871 pragma Assert (Result = 0);
873 if T.Known_Tasks_Index /= -1 then
874 Known_Tasks (T.Known_Tasks_Index) := null;
888 procedure Exit_Task is
897 procedure Abort_Task (T : Task_Id) is
900 -- Interrupt Server_Tasks may be waiting on an "event" flag (signal)
902 if T.Common.State = Interrupt_Server_Blocked_On_Event_Flag then
903 System.Interrupt_Management.Operations.Interrupt_Self_Process
904 (System.Interrupt_Management.Interrupt_ID
905 (PIO.Get_Interrupt_ID (T)));
913 procedure Initialize (S : in out Suspension_Object) is
914 Mutex_Attr : aliased pthread_mutexattr_t;
915 Cond_Attr : aliased pthread_condattr_t;
916 Result : Interfaces.C.int;
918 -- Initialize internal state. It is always initialized to False (ARM
924 -- Initialize internal mutex
926 Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access);
927 pragma Assert (Result = 0 or else Result = ENOMEM);
929 if Result = ENOMEM then
933 -- Initialize internal condition variable
935 Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access);
936 pragma Assert (Result = 0 or else Result = ENOMEM);
939 Result := pthread_mutex_destroy (S.L'Access);
940 pragma Assert (Result = 0);
942 if Result = ENOMEM then
952 procedure Finalize (S : in out Suspension_Object) is
953 Result : Interfaces.C.int;
955 -- Destroy internal mutex
957 Result := pthread_mutex_destroy (S.L'Access);
958 pragma Assert (Result = 0);
960 -- Destroy internal condition variable
962 Result := pthread_cond_destroy (S.CV'Access);
963 pragma Assert (Result = 0);
970 function Current_State (S : Suspension_Object) return Boolean is
972 -- We do not want to use lock on this read operation. State is marked
973 -- as Atomic so that we ensure that the value retrieved is correct.
982 procedure Set_False (S : in out Suspension_Object) is
983 Result : Interfaces.C.int;
987 Result := pthread_mutex_lock (S.L'Access);
988 pragma Assert (Result = 0);
992 Result := pthread_mutex_unlock (S.L'Access);
993 pragma Assert (Result = 0);
995 SSL.Abort_Undefer.all;
1002 procedure Set_True (S : in out Suspension_Object) is
1003 Result : Interfaces.C.int;
1005 SSL.Abort_Defer.all;
1007 Result := pthread_mutex_lock (S.L'Access);
1008 pragma Assert (Result = 0);
1010 -- If there is already a task waiting on this suspension object then
1011 -- we resume it, leaving the state of the suspension object to False,
1012 -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves
1013 -- the state to True.
1019 Result := pthread_cond_signal (S.CV'Access);
1020 pragma Assert (Result = 0);
1025 Result := pthread_mutex_unlock (S.L'Access);
1026 pragma Assert (Result = 0);
1028 SSL.Abort_Undefer.all;
1031 ------------------------
1032 -- Suspend_Until_True --
1033 ------------------------
1035 procedure Suspend_Until_True (S : in out Suspension_Object) is
1036 Result : Interfaces.C.int;
1038 SSL.Abort_Defer.all;
1040 Result := pthread_mutex_lock (S.L'Access);
1041 pragma Assert (Result = 0);
1044 -- Program_Error must be raised upon calling Suspend_Until_True
1045 -- if another task is already waiting on that suspension object
1046 -- (ARM D.10 par. 10).
1048 Result := pthread_mutex_unlock (S.L'Access);
1049 pragma Assert (Result = 0);
1051 SSL.Abort_Undefer.all;
1053 raise Program_Error;
1055 -- Suspend the task if the state is False. Otherwise, the task
1056 -- continues its execution, and the state of the suspension object
1057 -- is set to False (ARM D.10 par. 9).
1063 Result := pthread_cond_wait (S.CV'Access, S.L'Access);
1066 Result := pthread_mutex_unlock (S.L'Access);
1067 pragma Assert (Result = 0);
1069 SSL.Abort_Undefer.all;
1071 end Suspend_Until_True;
1079 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
1080 pragma Unreferenced (Self_ID);
1085 --------------------
1086 -- Check_No_Locks --
1087 --------------------
1089 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
1090 pragma Unreferenced (Self_ID);
1095 ----------------------
1096 -- Environment_Task --
1097 ----------------------
1099 function Environment_Task return Task_Id is
1101 return Environment_Task_Id;
1102 end Environment_Task;
1108 procedure Lock_RTS is
1110 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
1117 procedure Unlock_RTS is
1119 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
1126 function Suspend_Task
1128 Thread_Self : Thread_Id) return Boolean
1130 pragma Unreferenced (T);
1131 pragma Unreferenced (Thread_Self);
1140 function Resume_Task
1142 Thread_Self : Thread_Id) return Boolean
1144 pragma Unreferenced (T);
1145 pragma Unreferenced (Thread_Self);
1154 procedure Initialize (Environment_Task : Task_Id) is
1155 act : aliased struct_sigaction;
1156 old_act : aliased struct_sigaction;
1157 Tmp_Set : aliased sigset_t;
1158 Result : Interfaces.C.int;
1161 (Int : System.Interrupt_Management.Interrupt_ID) return Character;
1162 pragma Import (C, State, "__gnat_get_interrupt_state");
1163 -- Get interrupt state. Defined in a-init.c. The input argument is
1164 -- the interrupt number, and the result is one of the following:
1166 Default : constant Character := 's';
1167 -- 'n' this interrupt not set by any Interrupt_State pragma
1168 -- 'u' Interrupt_State pragma set state to User
1169 -- 'r' Interrupt_State pragma set state to Runtime
1170 -- 's' Interrupt_State pragma set state to System (use "default"
1174 Environment_Task_Id := Environment_Task;
1176 Interrupt_Management.Initialize;
1178 -- Initialize the lock used to synchronize chain of all ATCBs
1180 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1182 Specific.Initialize (Environment_Task);
1184 Enter_Task (Environment_Task);
1186 -- Install the abort-signal handler
1188 if State (System.Interrupt_Management.Abort_Task_Interrupt)
1192 act.sa_handler := Abort_Handler'Address;
1194 Result := sigemptyset (Tmp_Set'Access);
1195 pragma Assert (Result = 0);
1196 act.sa_mask := Tmp_Set;
1200 Signal (System.Interrupt_Management.Abort_Task_Interrupt),
1201 act'Unchecked_Access,
1202 old_act'Unchecked_Access);
1203 pragma Assert (Result = 0);
1207 -- NOTE: Unlike other pthread implementations, we do *not* mask all
1208 -- signals here since we handle signals using the process-wide primitive
1209 -- signal, rather than using sigthreadmask and sigwait. The reason of
1210 -- this difference is that sigwait doesn't work when some critical
1211 -- signals (SIGABRT, SIGPIPE) are masked.
1213 end System.Task_Primitives.Operations;