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 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 Ada.Unchecked_Conversion;
78 with Ada.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
171 new Ada.Unchecked_Conversion (Task_Id, System.Address);
177 procedure Abort_Handler (Sig : Signal) is
178 pragma Unreferenced (Sig);
180 Self_Id : constant Task_Id := Self;
181 Result : Interfaces.C.int;
182 Old_Set : aliased sigset_t;
185 if Self_Id.Deferral_Level = 0
186 and then Self_Id.Pending_ATC_Level < Self_Id.ATC_Nesting_Level
187 and then not Self_Id.Aborting
189 Self_Id.Aborting := True;
191 -- Make sure signals used for RTS internal purpose are unmasked
196 Unblocked_Signal_Mask'Access,
198 pragma Assert (Result = 0);
200 raise Standard'Abort_Signal;
208 -- The underlying thread system sets a guard page at the bottom of a thread
209 -- stack, so nothing is needed.
210 -- ??? Check the comment above
212 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
213 pragma Unreferenced (T, On);
222 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
224 return T.Common.LL.Thread;
231 function Self return Task_Id renames Specific.Self;
233 ---------------------
234 -- Initialize_Lock --
235 ---------------------
237 -- Note: mutexes and cond_variables needed per-task basis are initialized
238 -- in Initialize_TCB and the Storage_Error is handled. Other mutexes (such
239 -- as RTS_Lock, Memory_Lock...) used in RTS is initialized before any
240 -- status change of RTS. Therefore rasing Storage_Error in the following
241 -- routines should be able to be handled safely.
243 procedure Initialize_Lock
244 (Prio : System.Any_Priority;
245 L : not null access Lock)
247 Attributes : aliased pthread_mutexattr_t;
248 Result : Interfaces.C.int;
251 Result := pthread_mutexattr_init (Attributes'Access);
252 pragma Assert (Result = 0 or else Result = ENOMEM);
254 if Result = ENOMEM then
260 Result := pthread_mutex_init (L.L'Access, Attributes'Access);
261 pragma Assert (Result = 0 or else Result = ENOMEM);
263 if Result = ENOMEM then
267 Result := pthread_mutexattr_destroy (Attributes'Access);
268 pragma Assert (Result = 0);
271 procedure Initialize_Lock
272 (L : not null access RTS_Lock;
275 pragma Unreferenced (Level);
277 Attributes : aliased pthread_mutexattr_t;
278 Result : Interfaces.C.int;
281 Result := pthread_mutexattr_init (Attributes'Access);
282 pragma Assert (Result = 0 or else Result = ENOMEM);
284 if Result = ENOMEM then
288 Result := pthread_mutex_init (L, Attributes'Access);
290 pragma Assert (Result = 0 or else Result = ENOMEM);
292 if Result = ENOMEM then
296 Result := pthread_mutexattr_destroy (Attributes'Access);
297 pragma Assert (Result = 0);
304 procedure Finalize_Lock (L : not null access Lock) is
305 Result : Interfaces.C.int;
307 Result := pthread_mutex_destroy (L.L'Access);
308 pragma Assert (Result = 0);
311 procedure Finalize_Lock (L : not null access RTS_Lock) is
312 Result : Interfaces.C.int;
314 Result := pthread_mutex_destroy (L);
315 pragma Assert (Result = 0);
323 (L : not null access Lock;
324 Ceiling_Violation : out Boolean)
326 Result : Interfaces.C.int;
329 L.Owner_Priority := Get_Priority (Self);
331 if L.Priority < L.Owner_Priority then
332 Ceiling_Violation := True;
336 Result := pthread_mutex_lock (L.L'Access);
337 pragma Assert (Result = 0);
338 Ceiling_Violation := False;
342 (L : not null access RTS_Lock;
343 Global_Lock : Boolean := False)
345 Result : Interfaces.C.int;
347 if not Single_Lock or else Global_Lock then
348 Result := pthread_mutex_lock (L);
349 pragma Assert (Result = 0);
353 procedure Write_Lock (T : Task_Id) is
354 Result : Interfaces.C.int;
356 if not Single_Lock then
357 Result := pthread_mutex_lock (T.Common.LL.L'Access);
358 pragma Assert (Result = 0);
367 (L : not null access Lock;
368 Ceiling_Violation : out Boolean)
371 Write_Lock (L, Ceiling_Violation);
378 procedure Unlock (L : not null access Lock) is
379 Result : Interfaces.C.int;
381 Result := pthread_mutex_unlock (L.L'Access);
382 pragma Assert (Result = 0);
386 (L : not null access RTS_Lock;
387 Global_Lock : Boolean := False)
389 Result : Interfaces.C.int;
391 if not Single_Lock or else Global_Lock then
392 Result := pthread_mutex_unlock (L);
393 pragma Assert (Result = 0);
397 procedure Unlock (T : Task_Id) is
398 Result : Interfaces.C.int;
400 if not Single_Lock then
401 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
402 pragma Assert (Result = 0);
410 -- Dynamic priority ceilings are not supported by the underlying system
412 procedure Set_Ceiling
413 (L : not null access Lock;
414 Prio : System.Any_Priority)
416 pragma Unreferenced (L, Prio);
427 Reason : System.Tasking.Task_States)
429 pragma Unreferenced (Reason);
431 Result : Interfaces.C.int;
436 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
440 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
443 -- EINTR is not considered a failure
445 pragma Assert (Result = 0 or else Result = EINTR);
452 procedure Timed_Sleep
455 Mode : ST.Delay_Modes;
456 Reason : System.Tasking.Task_States;
457 Timedout : out Boolean;
458 Yielded : out Boolean)
460 pragma Unreferenced (Reason);
462 Check_Time : constant Duration := Monotonic_Clock;
464 Request : aliased timespec;
465 Result : Interfaces.C.int;
471 if Mode = Relative then
472 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
474 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
477 if Abs_Time > Check_Time then
478 Request := To_Timespec (Abs_Time);
481 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
485 pthread_cond_timedwait
486 (Self_ID.Common.LL.CV'Access,
487 Single_RTS_Lock'Access,
492 pthread_cond_timedwait
493 (Self_ID.Common.LL.CV'Access,
494 Self_ID.Common.LL.L'Access,
498 exit when Abs_Time <= Monotonic_Clock;
500 if Result = 0 or Result = EINTR then
502 -- Somebody may have called Wakeup for us
508 pragma Assert (Result = ETIMEDOUT);
517 procedure Timed_Delay
520 Mode : ST.Delay_Modes)
522 Check_Time : constant Duration := Monotonic_Clock;
524 Request : aliased timespec;
526 Result : Interfaces.C.int;
527 pragma Warnings (Off, Result);
534 Write_Lock (Self_ID);
536 if Mode = Relative then
537 Abs_Time := Time + Check_Time;
539 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
542 if Abs_Time > Check_Time then
543 Request := To_Timespec (Abs_Time);
544 Self_ID.Common.State := Delay_Sleep;
547 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
551 pthread_cond_timedwait
552 (Self_ID.Common.LL.CV'Access,
553 Single_RTS_Lock'Access,
557 pthread_cond_timedwait
558 (Self_ID.Common.LL.CV'Access,
559 Self_ID.Common.LL.L'Access,
563 exit when Abs_Time <= Monotonic_Clock;
565 pragma Assert (Result = 0 or else
566 Result = ETIMEDOUT or else
570 Self_ID.Common.State := Runnable;
579 Result := sched_yield;
582 ---------------------
583 -- Monotonic_Clock --
584 ---------------------
586 function Monotonic_Clock return Duration is
587 TS : aliased timespec;
588 Result : Interfaces.C.int;
590 Result := Clock_Gettime (CLOCK_REALTIME, TS'Unchecked_Access);
591 pragma Assert (Result = 0);
592 return To_Duration (TS);
599 function RT_Resolution return Duration is
608 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
609 pragma Unreferenced (Reason);
610 Result : Interfaces.C.int;
612 Result := pthread_cond_signal (T.Common.LL.CV'Access);
613 pragma Assert (Result = 0);
620 procedure Yield (Do_Yield : Boolean := True) is
621 Result : Interfaces.C.int;
622 pragma Unreferenced (Result);
625 Result := sched_yield;
633 type Prio_Array_Type is array (System.Any_Priority) of Integer;
634 pragma Atomic_Components (Prio_Array_Type);
636 Prio_Array : Prio_Array_Type;
637 -- Global array containing the id of the currently running task for
640 -- Note: assume we are on single processor with run-til-blocked scheduling
642 procedure Set_Priority
644 Prio : System.Any_Priority;
645 Loss_Of_Inheritance : Boolean := False)
647 Result : Interfaces.C.int;
648 Array_Item : Integer;
649 Param : aliased struct_sched_param;
651 function Get_Policy (Prio : System.Any_Priority) return Character;
652 pragma Import (C, Get_Policy, "__gnat_get_specific_dispatching");
653 -- Get priority specific dispatching policy
655 Priority_Specific_Policy : constant Character := Get_Policy (Prio);
656 -- Upper case first character of the policy name corresponding to the
657 -- task as set by a Priority_Specific_Dispatching pragma.
660 Param.sched_priority := Interfaces.C.int (Underlying_Priorities (Prio));
662 if Dispatching_Policy = 'R'
663 or else Priority_Specific_Policy = 'R'
664 or else Time_Slice_Val > 0
667 pthread_setschedparam
668 (T.Common.LL.Thread, SCHED_RR, Param'Access);
670 elsif Dispatching_Policy = 'F'
671 or else Priority_Specific_Policy = 'F'
672 or else Time_Slice_Val = 0
675 pthread_setschedparam
676 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
680 pthread_setschedparam
681 (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
684 pragma Assert (Result = 0);
686 if Dispatching_Policy = 'F' or else Priority_Specific_Policy = 'F' then
688 -- Annex D requirement [RM D.2.2 par. 9]:
689 -- If the task drops its priority due to the loss of inherited
690 -- priority, it is added at the head of the ready queue for its
691 -- new active priority.
693 if Loss_Of_Inheritance
694 and then Prio < T.Common.Current_Priority
696 Array_Item := Prio_Array (T.Common.Base_Priority) + 1;
697 Prio_Array (T.Common.Base_Priority) := Array_Item;
700 -- Let some processes a chance to arrive
704 -- Then wait for our turn to proceed
706 exit when Array_Item = Prio_Array (T.Common.Base_Priority)
707 or else Prio_Array (T.Common.Base_Priority) = 1;
710 Prio_Array (T.Common.Base_Priority) :=
711 Prio_Array (T.Common.Base_Priority) - 1;
715 T.Common.Current_Priority := Prio;
722 function Get_Priority (T : Task_Id) return System.Any_Priority is
724 return T.Common.Current_Priority;
731 procedure Enter_Task (Self_ID : Task_Id) is
733 Self_ID.Common.LL.Thread := pthread_self;
734 Specific.Set (Self_ID);
738 for J in Known_Tasks'Range loop
739 if Known_Tasks (J) = null then
740 Known_Tasks (J) := Self_ID;
741 Self_ID.Known_Tasks_Index := J;
753 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
755 return new Ada_Task_Control_Block (Entry_Num);
762 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
764 -----------------------------
765 -- Register_Foreign_Thread --
766 -----------------------------
768 function Register_Foreign_Thread return Task_Id is
770 if Is_Valid_Task then
773 return Register_Foreign_Thread (pthread_self);
775 end Register_Foreign_Thread;
781 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
782 Mutex_Attr : aliased pthread_mutexattr_t;
783 Result : Interfaces.C.int;
784 Cond_Attr : aliased pthread_condattr_t;
787 if not Single_Lock then
788 Result := pthread_mutexattr_init (Mutex_Attr'Access);
789 pragma Assert (Result = 0 or else Result = ENOMEM);
794 (Self_ID.Common.LL.L'Access, Mutex_Attr'Access);
795 pragma Assert (Result = 0 or else Result = ENOMEM);
803 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
804 pragma Assert (Result = 0);
807 Result := pthread_condattr_init (Cond_Attr'Access);
808 pragma Assert (Result = 0 or else Result = ENOMEM);
813 (Self_ID.Common.LL.CV'Access,
815 pragma Assert (Result = 0 or else Result = ENOMEM);
821 if not Single_Lock then
822 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
823 pragma Assert (Result = 0);
829 Result := pthread_condattr_destroy (Cond_Attr'Access);
830 pragma Assert (Result = 0);
837 procedure Create_Task
839 Wrapper : System.Address;
840 Stack_Size : System.Parameters.Size_Type;
841 Priority : System.Any_Priority;
842 Succeeded : out Boolean)
844 Attributes : aliased pthread_attr_t;
845 Result : Interfaces.C.int;
847 function Thread_Body_Access is new
848 Ada.Unchecked_Conversion (System.Address, Thread_Body);
851 Result := pthread_attr_init (Attributes'Access);
852 pragma Assert (Result = 0 or else Result = ENOMEM);
859 Result := pthread_attr_setstacksize
860 (Attributes'Access, Interfaces.C.size_t (Stack_Size));
861 pragma Assert (Result = 0);
863 -- Since the initial signal mask of a thread is inherited from the
864 -- creator, and the Environment task has all its signals masked, we
865 -- do not need to manipulate caller's signal mask at this point.
866 -- All tasks in RTS will have All_Tasks_Mask initially.
868 Result := pthread_create
869 (T.Common.LL.Thread'Access,
871 Thread_Body_Access (Wrapper),
873 pragma Assert (Result = 0 or else Result = EAGAIN);
875 Succeeded := Result = 0;
877 pthread_detach (T.Common.LL.Thread'Access);
878 -- Detach the thread using pthread_detach, sinc DCE threads do not have
879 -- pthread_attr_set_detachstate.
881 Result := pthread_attr_destroy (Attributes'Access);
882 pragma Assert (Result = 0);
884 Set_Priority (T, Priority);
891 procedure Finalize_TCB (T : Task_Id) is
892 Result : Interfaces.C.int;
894 Is_Self : constant Boolean := T = Self;
896 procedure Free is new
897 Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
900 if not Single_Lock then
901 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
902 pragma Assert (Result = 0);
905 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
906 pragma Assert (Result = 0);
908 if T.Known_Tasks_Index /= -1 then
909 Known_Tasks (T.Known_Tasks_Index) := null;
923 procedure Exit_Task is
932 procedure Abort_Task (T : Task_Id) is
934 -- Interrupt Server_Tasks may be waiting on an "event" flag (signal)
936 if T.Common.State = Interrupt_Server_Blocked_On_Event_Flag then
937 System.Interrupt_Management.Operations.Interrupt_Self_Process
938 (System.Interrupt_Management.Interrupt_ID
939 (PIO.Get_Interrupt_ID (T)));
947 procedure Initialize (S : in out Suspension_Object) is
948 Mutex_Attr : aliased pthread_mutexattr_t;
949 Cond_Attr : aliased pthread_condattr_t;
950 Result : Interfaces.C.int;
952 -- Initialize internal state (always to False (ARM D.10(6)))
957 -- Initialize internal mutex
959 Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access);
960 pragma Assert (Result = 0 or else Result = ENOMEM);
962 if Result = ENOMEM then
966 -- Initialize internal condition variable
968 Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access);
969 pragma Assert (Result = 0 or else Result = ENOMEM);
972 Result := pthread_mutex_destroy (S.L'Access);
973 pragma Assert (Result = 0);
975 if Result = ENOMEM then
985 procedure Finalize (S : in out Suspension_Object) is
986 Result : Interfaces.C.int;
989 -- Destroy internal mutex
991 Result := pthread_mutex_destroy (S.L'Access);
992 pragma Assert (Result = 0);
994 -- Destroy internal condition variable
996 Result := pthread_cond_destroy (S.CV'Access);
997 pragma Assert (Result = 0);
1004 function Current_State (S : Suspension_Object) return Boolean is
1006 -- We do not want to use lock on this read operation. State is marked
1007 -- as Atomic so that we ensure that the value retrieved is correct.
1016 procedure Set_False (S : in out Suspension_Object) is
1017 Result : Interfaces.C.int;
1020 SSL.Abort_Defer.all;
1022 Result := pthread_mutex_lock (S.L'Access);
1023 pragma Assert (Result = 0);
1027 Result := pthread_mutex_unlock (S.L'Access);
1028 pragma Assert (Result = 0);
1030 SSL.Abort_Undefer.all;
1037 procedure Set_True (S : in out Suspension_Object) is
1038 Result : Interfaces.C.int;
1041 SSL.Abort_Defer.all;
1043 Result := pthread_mutex_lock (S.L'Access);
1044 pragma Assert (Result = 0);
1046 -- If there is already a task waiting on this suspension object then
1047 -- we resume it, leaving the state of the suspension object to False,
1048 -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves
1049 -- the state to True.
1055 Result := pthread_cond_signal (S.CV'Access);
1056 pragma Assert (Result = 0);
1062 Result := pthread_mutex_unlock (S.L'Access);
1063 pragma Assert (Result = 0);
1065 SSL.Abort_Undefer.all;
1068 ------------------------
1069 -- Suspend_Until_True --
1070 ------------------------
1072 procedure Suspend_Until_True (S : in out Suspension_Object) is
1073 Result : Interfaces.C.int;
1076 SSL.Abort_Defer.all;
1078 Result := pthread_mutex_lock (S.L'Access);
1079 pragma Assert (Result = 0);
1082 -- Program_Error must be raised upon calling Suspend_Until_True
1083 -- if another task is already waiting on that suspension object
1084 -- (ARM D.10 par. 10).
1086 Result := pthread_mutex_unlock (S.L'Access);
1087 pragma Assert (Result = 0);
1089 SSL.Abort_Undefer.all;
1091 raise Program_Error;
1093 -- Suspend the task if the state is False. Otherwise, the task
1094 -- continues its execution, and the state of the suspension object
1095 -- is set to False (ARM D.10 par. 9).
1101 Result := pthread_cond_wait (S.CV'Access, S.L'Access);
1104 Result := pthread_mutex_unlock (S.L'Access);
1105 pragma Assert (Result = 0);
1107 SSL.Abort_Undefer.all;
1109 end Suspend_Until_True;
1117 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
1118 pragma Unreferenced (Self_ID);
1123 --------------------
1124 -- Check_No_Locks --
1125 --------------------
1127 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
1128 pragma Unreferenced (Self_ID);
1133 ----------------------
1134 -- Environment_Task --
1135 ----------------------
1137 function Environment_Task return Task_Id is
1139 return Environment_Task_Id;
1140 end Environment_Task;
1146 procedure Lock_RTS is
1148 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
1155 procedure Unlock_RTS is
1157 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
1164 function Suspend_Task
1166 Thread_Self : Thread_Id) return Boolean
1168 pragma Unreferenced (T);
1169 pragma Unreferenced (Thread_Self);
1178 function Resume_Task
1180 Thread_Self : Thread_Id) return Boolean
1182 pragma Unreferenced (T);
1183 pragma Unreferenced (Thread_Self);
1188 --------------------
1189 -- Stop_All_Tasks --
1190 --------------------
1192 procedure Stop_All_Tasks is
1201 function Stop_Task (T : ST.Task_Id) return Boolean is
1202 pragma Unreferenced (T);
1211 function Continue_Task (T : ST.Task_Id) return Boolean is
1212 pragma Unreferenced (T);
1221 procedure Initialize (Environment_Task : Task_Id) is
1222 act : aliased struct_sigaction;
1223 old_act : aliased struct_sigaction;
1224 Tmp_Set : aliased sigset_t;
1225 Result : Interfaces.C.int;
1228 (Int : System.Interrupt_Management.Interrupt_ID) return Character;
1229 pragma Import (C, State, "__gnat_get_interrupt_state");
1230 -- Get interrupt state. Defined in a-init.c. The input argument is
1231 -- the interrupt number, and the result is one of the following:
1233 Default : constant Character := 's';
1234 -- 'n' this interrupt not set by any Interrupt_State pragma
1235 -- 'u' Interrupt_State pragma set state to User
1236 -- 'r' Interrupt_State pragma set state to Runtime
1237 -- 's' Interrupt_State pragma set state to System (use "default"
1241 Environment_Task_Id := Environment_Task;
1243 Interrupt_Management.Initialize;
1245 -- Initialize the lock used to synchronize chain of all ATCBs
1247 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1249 Specific.Initialize (Environment_Task);
1251 Enter_Task (Environment_Task);
1253 -- Install the abort-signal handler
1255 if State (System.Interrupt_Management.Abort_Task_Interrupt)
1259 act.sa_handler := Abort_Handler'Address;
1261 Result := sigemptyset (Tmp_Set'Access);
1262 pragma Assert (Result = 0);
1263 act.sa_mask := Tmp_Set;
1267 Signal (System.Interrupt_Management.Abort_Task_Interrupt),
1268 act'Unchecked_Access,
1269 old_act'Unchecked_Access);
1270 pragma Assert (Result = 0);
1274 -- NOTE: Unlike other pthread implementations, we do *not* mask all
1275 -- signals here since we handle signals using the process-wide primitive
1276 -- signal, rather than using sigthreadmask and sigwait. The reason of
1277 -- this difference is that sigwait doesn't work when some critical
1278 -- signals (SIGABRT, SIGPIPE) are masked.
1280 end System.Task_Primitives.Operations;