1 ------------------------------------------------------------------------------
3 -- GNU ADA 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) 1992-2008, 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 GNU/Linux (GNU/LinuxThreads) version of this package
36 -- This package contains all the GNULL primitives that interface directly with
40 -- Turn off polling, we do not want ATC polling to take place during tasking
41 -- operations. It causes infinite loops and other problems.
43 with Ada.Unchecked_Conversion;
44 with Ada.Unchecked_Deallocation;
48 with System.Task_Info;
49 with System.Tasking.Debug;
50 with System.Interrupt_Management;
51 with System.OS_Primitives;
52 with System.Storage_Elements;
53 with System.Stack_Checking.Operations;
55 with System.Soft_Links;
56 -- We use System.Soft_Links instead of System.Tasking.Initialization
57 -- because the later is a higher level package that we shouldn't depend on.
58 -- For example when using the restricted run time, it is replaced by
59 -- System.Tasking.Restricted.Stages.
61 package body System.Task_Primitives.Operations is
63 package SSL renames System.Soft_Links;
64 package SC renames System.Stack_Checking.Operations;
66 use System.Tasking.Debug;
69 use System.OS_Interface;
70 use System.Parameters;
71 use System.OS_Primitives;
72 use System.Storage_Elements;
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 Unblocked_Signal_Mask : aliased sigset_t;
94 -- The set of signals that should be unblocked in all tasks
96 -- The followings are internal configuration constants needed
98 Next_Serial_Number : Task_Serial_Number := 100;
99 -- We start at 100 (reserve some special values for using in error checks)
101 Time_Slice_Val : Integer;
102 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
104 Dispatching_Policy : Character;
105 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
107 -- The following are effectively constants, but they need to be initialized
108 -- by calling a pthread_ function.
110 Mutex_Attr : aliased pthread_mutexattr_t;
111 Cond_Attr : aliased pthread_condattr_t;
113 Foreign_Task_Elaborated : aliased Boolean := True;
114 -- Used to identified fake tasks (i.e., non-Ada Threads)
122 procedure Initialize (Environment_Task : Task_Id);
123 pragma Inline (Initialize);
124 -- Initialize various data needed by this package
126 function Is_Valid_Task return Boolean;
127 pragma Inline (Is_Valid_Task);
128 -- Does executing thread have a TCB?
130 procedure Set (Self_Id : Task_Id);
132 -- Set the self id for the current task
134 function Self return Task_Id;
135 pragma Inline (Self);
136 -- Return a pointer to the Ada Task Control Block of the calling task
140 package body Specific is separate;
141 -- The body of this package is target specific
143 ---------------------------------
144 -- Support for foreign threads --
145 ---------------------------------
147 function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
148 -- Allocate and Initialize a new ATCB for the current Thread
150 function Register_Foreign_Thread
151 (Thread : Thread_Id) return Task_Id is separate;
153 -----------------------
154 -- Local Subprograms --
155 -----------------------
157 subtype unsigned_long is Interfaces.C.unsigned_long;
159 procedure Abort_Handler (signo : Signal);
161 function To_pthread_t is new Ada.Unchecked_Conversion
162 (unsigned_long, System.OS_Interface.pthread_t);
164 procedure Get_Stack_Attributes
166 ISP : out System.Address;
167 Size : out Storage_Offset);
168 -- Fill ISP and Size with the Initial Stack Pointer value and the
169 -- thread stack size for task T.
175 procedure Abort_Handler (signo : Signal) is
176 pragma Unreferenced (signo);
178 Self_Id : constant Task_Id := Self;
179 Result : Interfaces.C.int;
180 Old_Set : aliased sigset_t;
183 if ZCX_By_Default and then GCC_ZCX_Support then
187 if Self_Id.Deferral_Level = 0
188 and then Self_Id.Pending_ATC_Level < Self_Id.ATC_Nesting_Level
189 and then not Self_Id.Aborting
191 Self_Id.Aborting := True;
193 -- Make sure signals used for RTS internal purpose are unmasked
198 Unblocked_Signal_Mask'Access,
200 pragma Assert (Result = 0);
202 raise Standard'Abort_Signal;
210 procedure Lock_RTS is
212 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
219 procedure Unlock_RTS is
221 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
228 -- The underlying thread system extends the memory (up to 2MB) when needed
230 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
231 pragma Unreferenced (T);
232 pragma Unreferenced (On);
241 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
243 return T.Common.LL.Thread;
250 function Self return Task_Id renames Specific.Self;
252 ---------------------
253 -- Initialize_Lock --
254 ---------------------
256 -- Note: mutexes and cond_variables needed per-task basis are initialized
257 -- in Initialize_TCB and the Storage_Error is handled. Other mutexes (such
258 -- as RTS_Lock, Memory_Lock...) used in RTS is initialized before any
259 -- status change of RTS. Therefore rasing Storage_Error in the following
260 -- routines should be able to be handled safely.
262 procedure Initialize_Lock
263 (Prio : System.Any_Priority;
264 L : not null access Lock)
266 pragma Unreferenced (Prio);
268 Result : Interfaces.C.int;
271 Result := pthread_mutex_init (L, Mutex_Attr'Access);
273 pragma Assert (Result = 0 or else Result = ENOMEM);
275 if Result = ENOMEM then
276 raise Storage_Error with "Failed to allocate a lock";
280 procedure Initialize_Lock
281 (L : not null access RTS_Lock;
284 pragma Unreferenced (Level);
286 Result : Interfaces.C.int;
289 Result := pthread_mutex_init (L, Mutex_Attr'Access);
291 pragma Assert (Result = 0 or else Result = ENOMEM);
293 if Result = ENOMEM then
302 procedure Finalize_Lock (L : not null access Lock) is
303 Result : Interfaces.C.int;
305 Result := pthread_mutex_destroy (L);
306 pragma Assert (Result = 0);
309 procedure Finalize_Lock (L : not null access RTS_Lock) is
310 Result : Interfaces.C.int;
312 Result := pthread_mutex_destroy (L);
313 pragma Assert (Result = 0);
321 (L : not null access Lock;
322 Ceiling_Violation : out Boolean)
324 Result : Interfaces.C.int;
326 Result := pthread_mutex_lock (L);
327 Ceiling_Violation := Result = EINVAL;
329 -- Assume the cause of EINVAL is a priority ceiling violation
331 pragma Assert (Result = 0 or else Result = EINVAL);
335 (L : not null access RTS_Lock;
336 Global_Lock : Boolean := False)
338 Result : Interfaces.C.int;
340 if not Single_Lock or else Global_Lock then
341 Result := pthread_mutex_lock (L);
342 pragma Assert (Result = 0);
346 procedure Write_Lock (T : Task_Id) is
347 Result : Interfaces.C.int;
349 if not Single_Lock then
350 Result := pthread_mutex_lock (T.Common.LL.L'Access);
351 pragma Assert (Result = 0);
360 (L : not null access Lock;
361 Ceiling_Violation : out Boolean)
364 Write_Lock (L, Ceiling_Violation);
371 procedure Unlock (L : not null access Lock) is
372 Result : Interfaces.C.int;
374 Result := pthread_mutex_unlock (L);
375 pragma Assert (Result = 0);
379 (L : not null access RTS_Lock;
380 Global_Lock : Boolean := False)
382 Result : Interfaces.C.int;
384 if not Single_Lock or else Global_Lock then
385 Result := pthread_mutex_unlock (L);
386 pragma Assert (Result = 0);
390 procedure Unlock (T : Task_Id) is
391 Result : Interfaces.C.int;
393 if not Single_Lock then
394 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
395 pragma Assert (Result = 0);
403 -- Dynamic priority ceilings are not supported by the underlying system
405 procedure Set_Ceiling
406 (L : not null access Lock;
407 Prio : System.Any_Priority)
409 pragma Unreferenced (L, Prio);
420 Reason : System.Tasking.Task_States)
422 pragma Unreferenced (Reason);
424 Result : Interfaces.C.int;
427 pragma Assert (Self_ID = Self);
432 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
436 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
439 -- EINTR is not considered a failure
441 pragma Assert (Result = 0 or else Result = EINTR);
448 -- This is for use within the run-time system, so abort is
449 -- assumed to be already deferred, and the caller should be
450 -- holding its own ATCB lock.
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 Base_Time : constant Duration := Monotonic_Clock;
463 Check_Time : Duration := Base_Time;
465 Request : aliased timespec;
466 Result : Interfaces.C.int;
472 if Mode = Relative then
473 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
475 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
478 if Abs_Time > Check_Time then
479 Request := To_Timespec (Abs_Time);
482 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
486 pthread_cond_timedwait
487 (Self_ID.Common.LL.CV'Access,
488 Single_RTS_Lock'Access,
493 pthread_cond_timedwait
494 (Self_ID.Common.LL.CV'Access,
495 Self_ID.Common.LL.L'Access,
499 Check_Time := Monotonic_Clock;
500 exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
502 if Result = 0 or else Result = EINTR then
504 -- Somebody may have called Wakeup for us
510 pragma Assert (Result = ETIMEDOUT);
519 -- This is for use in implementing delay statements, so we assume the
520 -- caller is abort-deferred but is holding no locks.
522 procedure Timed_Delay
525 Mode : ST.Delay_Modes)
527 Base_Time : constant Duration := Monotonic_Clock;
528 Check_Time : Duration := Base_Time;
530 Request : aliased timespec;
532 Result : Interfaces.C.int;
533 pragma Warnings (Off, Result);
540 Write_Lock (Self_ID);
542 if Mode = Relative then
543 Abs_Time := Time + Check_Time;
545 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
548 if Abs_Time > Check_Time then
549 Request := To_Timespec (Abs_Time);
550 Self_ID.Common.State := Delay_Sleep;
553 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
556 Result := pthread_cond_timedwait
557 (Self_ID.Common.LL.CV'Access,
558 Single_RTS_Lock'Access,
561 Result := pthread_cond_timedwait
562 (Self_ID.Common.LL.CV'Access,
563 Self_ID.Common.LL.L'Access,
567 Check_Time := Monotonic_Clock;
568 exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
570 pragma Assert (Result = 0 or else
571 Result = ETIMEDOUT or else
575 Self_ID.Common.State := Runnable;
584 Result := sched_yield;
587 ---------------------
588 -- Monotonic_Clock --
589 ---------------------
591 function Monotonic_Clock return Duration is
592 TV : aliased struct_timeval;
593 Result : Interfaces.C.int;
595 Result := gettimeofday (TV'Access, System.Null_Address);
596 pragma Assert (Result = 0);
597 return To_Duration (TV);
604 function RT_Resolution return Duration is
613 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
614 pragma Unreferenced (Reason);
615 Result : Interfaces.C.int;
617 Result := pthread_cond_signal (T.Common.LL.CV'Access);
618 pragma Assert (Result = 0);
625 procedure Yield (Do_Yield : Boolean := True) is
626 Result : Interfaces.C.int;
627 pragma Unreferenced (Result);
630 Result := sched_yield;
638 procedure Set_Priority
640 Prio : System.Any_Priority;
641 Loss_Of_Inheritance : Boolean := False)
643 pragma Unreferenced (Loss_Of_Inheritance);
645 Result : Interfaces.C.int;
646 Param : aliased struct_sched_param;
648 function Get_Policy (Prio : System.Any_Priority) return Character;
649 pragma Import (C, Get_Policy, "__gnat_get_specific_dispatching");
650 -- Get priority specific dispatching policy
652 Priority_Specific_Policy : constant Character := Get_Policy (Prio);
653 -- Upper case first character of the policy name corresponding to the
654 -- task as set by a Priority_Specific_Dispatching pragma.
657 T.Common.Current_Priority := Prio;
659 -- Priorities are 1 .. 99 on GNU/Linux, so we map 0 .. 98 to 1 .. 99
661 Param.sched_priority := Interfaces.C.int (Prio) + 1;
663 if Dispatching_Policy = 'R'
664 or else Priority_Specific_Policy = 'R'
665 or else Time_Slice_Val > 0
668 pthread_setschedparam
669 (T.Common.LL.Thread, SCHED_RR, Param'Access);
671 elsif Dispatching_Policy = 'F'
672 or else Priority_Specific_Policy = 'F'
673 or else Time_Slice_Val = 0
676 pthread_setschedparam
677 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
680 Param.sched_priority := 0;
682 pthread_setschedparam
684 SCHED_OTHER, Param'Access);
687 pragma Assert (Result = 0 or else Result = EPERM);
694 function Get_Priority (T : Task_Id) return System.Any_Priority is
696 return T.Common.Current_Priority;
699 --------------------------
700 -- Get_Stack_Attributes --
701 --------------------------
703 procedure Get_Stack_Attributes
705 ISP : out System.Address;
706 Size : out Storage_Offset)
708 function pthread_getattr_np
710 attr : System.Address) return Interfaces.C.int;
711 pragma Import (C, pthread_getattr_np, "pthread_getattr_np");
713 function pthread_attr_getstack
714 (attr : System.Address;
715 base : System.Address;
716 size : System.Address) return Interfaces.C.int;
717 pragma Import (C, pthread_attr_getstack, "pthread_attr_getstack");
719 Result : Interfaces.C.int;
721 Attributes : aliased pthread_attr_t;
722 Stack_Base : aliased System.Address;
723 Stack_Size : aliased Storage_Offset;
728 (T.Common.LL.Thread, Attributes'Address);
729 pragma Assert (Result = 0);
732 pthread_attr_getstack
733 (Attributes'Address, Stack_Base'Address, Stack_Size'Address);
734 pragma Assert (Result = 0);
736 Result := pthread_attr_destroy (Attributes'Access);
737 pragma Assert (Result = 0);
739 ISP := Stack_Base + Stack_Size;
741 end Get_Stack_Attributes;
747 procedure Enter_Task (Self_ID : Task_Id) is
749 if Self_ID.Common.Task_Info /= null
751 Self_ID.Common.Task_Info.CPU_Affinity = No_CPU
753 raise Invalid_CPU_Number;
756 Self_ID.Common.LL.Thread := pthread_self;
758 Specific.Set (Self_ID);
762 for J in Known_Tasks'Range loop
763 if Known_Tasks (J) = null then
764 Known_Tasks (J) := Self_ID;
765 Self_ID.Known_Tasks_Index := J;
772 -- Determine where the task stack starts, how large it is, and let the
773 -- stack checking engine know about it.
776 Initial_SP : System.Address;
777 Stack_Size : Storage_Offset;
779 Get_Stack_Attributes (Self_ID, Initial_SP, Stack_Size);
780 System.Stack_Checking.Operations.Notify_Stack_Attributes
781 (Initial_SP, Stack_Size);
789 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
791 return new Ada_Task_Control_Block (Entry_Num);
798 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
800 -----------------------------
801 -- Register_Foreign_Thread --
802 -----------------------------
804 function Register_Foreign_Thread return Task_Id is
806 if Is_Valid_Task then
809 return Register_Foreign_Thread (pthread_self);
811 end Register_Foreign_Thread;
817 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
818 Result : Interfaces.C.int;
821 -- Give the task a unique serial number
823 Self_ID.Serial_Number := Next_Serial_Number;
824 Next_Serial_Number := Next_Serial_Number + 1;
825 pragma Assert (Next_Serial_Number /= 0);
827 Self_ID.Common.LL.Thread := To_pthread_t (-1);
829 if not Single_Lock then
830 Result := pthread_mutex_init (Self_ID.Common.LL.L'Access,
832 pragma Assert (Result = 0 or else Result = ENOMEM);
840 Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
842 pragma Assert (Result = 0 or else Result = ENOMEM);
847 if not Single_Lock then
848 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
849 pragma Assert (Result = 0);
860 procedure Create_Task
862 Wrapper : System.Address;
863 Stack_Size : System.Parameters.Size_Type;
864 Priority : System.Any_Priority;
865 Succeeded : out Boolean)
867 Attributes : aliased pthread_attr_t;
868 Result : Interfaces.C.int;
871 Result := pthread_attr_init (Attributes'Access);
872 pragma Assert (Result = 0 or else Result = ENOMEM);
880 pthread_attr_setstacksize
881 (Attributes'Access, Interfaces.C.size_t (Stack_Size));
882 pragma Assert (Result = 0);
885 pthread_attr_setdetachstate
886 (Attributes'Access, PTHREAD_CREATE_DETACHED);
887 pragma Assert (Result = 0);
889 -- Since the initial signal mask of a thread is inherited from the
890 -- creator, and the Environment task has all its signals masked, we
891 -- do not need to manipulate caller's signal mask at this point.
892 -- All tasks in RTS will have All_Tasks_Mask initially.
894 Result := pthread_create
895 (T.Common.LL.Thread'Access,
897 Thread_Body_Access (Wrapper),
899 pragma Assert (Result = 0 or else Result = EAGAIN);
903 Result := pthread_attr_destroy (Attributes'Access);
904 pragma Assert (Result = 0);
912 if T.Common.Task_Info /= null then
913 if T.Common.Task_Info.CPU_Affinity /= Task_Info.Any_CPU then
915 pthread_setaffinity_np
918 T.Common.Task_Info.CPU_Affinity'Access);
919 pragma Assert (Result = 0);
923 Result := pthread_attr_destroy (Attributes'Access);
924 pragma Assert (Result = 0);
926 Set_Priority (T, Priority);
933 procedure Finalize_TCB (T : Task_Id) is
934 Result : Interfaces.C.int;
936 Is_Self : constant Boolean := T = Self;
938 procedure Free is new
939 Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
942 if not Single_Lock then
943 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
944 pragma Assert (Result = 0);
947 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
948 pragma Assert (Result = 0);
950 if T.Known_Tasks_Index /= -1 then
951 Known_Tasks (T.Known_Tasks_Index) := null;
953 SC.Invalidate_Stack_Cache (T.Common.Compiler_Data.Pri_Stack_Info'Access);
965 procedure Exit_Task is
974 procedure Abort_Task (T : Task_Id) is
975 Result : Interfaces.C.int;
980 Signal (System.Interrupt_Management.Abort_Task_Interrupt));
981 pragma Assert (Result = 0);
988 procedure Initialize (S : in out Suspension_Object) is
989 Result : Interfaces.C.int;
992 -- Initialize internal state (always to False (RM D.10(6)))
997 -- Initialize internal mutex
999 Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access);
1001 pragma Assert (Result = 0 or else Result = ENOMEM);
1003 if Result = ENOMEM then
1004 raise Storage_Error;
1007 -- Initialize internal condition variable
1009 Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access);
1011 pragma Assert (Result = 0 or else Result = ENOMEM);
1014 Result := pthread_mutex_destroy (S.L'Access);
1015 pragma Assert (Result = 0);
1017 if Result = ENOMEM then
1018 raise Storage_Error;
1027 procedure Finalize (S : in out Suspension_Object) is
1028 Result : Interfaces.C.int;
1031 -- Destroy internal mutex
1033 Result := pthread_mutex_destroy (S.L'Access);
1034 pragma Assert (Result = 0);
1036 -- Destroy internal condition variable
1038 Result := pthread_cond_destroy (S.CV'Access);
1039 pragma Assert (Result = 0);
1046 function Current_State (S : Suspension_Object) return Boolean is
1048 -- We do not want to use lock on this read operation. State is marked
1049 -- as Atomic so that we ensure that the value retrieved is correct.
1058 procedure Set_False (S : in out Suspension_Object) is
1059 Result : Interfaces.C.int;
1062 SSL.Abort_Defer.all;
1064 Result := pthread_mutex_lock (S.L'Access);
1065 pragma Assert (Result = 0);
1069 Result := pthread_mutex_unlock (S.L'Access);
1070 pragma Assert (Result = 0);
1072 SSL.Abort_Undefer.all;
1079 procedure Set_True (S : in out Suspension_Object) is
1080 Result : Interfaces.C.int;
1083 SSL.Abort_Defer.all;
1085 Result := pthread_mutex_lock (S.L'Access);
1086 pragma Assert (Result = 0);
1088 -- If there is already a task waiting on this suspension object then
1089 -- we resume it, leaving the state of the suspension object to False,
1090 -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves
1091 -- the state to True.
1097 Result := pthread_cond_signal (S.CV'Access);
1098 pragma Assert (Result = 0);
1104 Result := pthread_mutex_unlock (S.L'Access);
1105 pragma Assert (Result = 0);
1107 SSL.Abort_Undefer.all;
1110 ------------------------
1111 -- Suspend_Until_True --
1112 ------------------------
1114 procedure Suspend_Until_True (S : in out Suspension_Object) is
1115 Result : Interfaces.C.int;
1118 SSL.Abort_Defer.all;
1120 Result := pthread_mutex_lock (S.L'Access);
1121 pragma Assert (Result = 0);
1125 -- Program_Error must be raised upon calling Suspend_Until_True
1126 -- if another task is already waiting on that suspension object
1129 Result := pthread_mutex_unlock (S.L'Access);
1130 pragma Assert (Result = 0);
1132 SSL.Abort_Undefer.all;
1134 raise Program_Error;
1136 -- Suspend the task if the state is False. Otherwise, the task
1137 -- continues its execution, and the state of the suspension object
1138 -- is set to False (ARM D.10 par. 9).
1144 Result := pthread_cond_wait (S.CV'Access, S.L'Access);
1147 Result := pthread_mutex_unlock (S.L'Access);
1148 pragma Assert (Result = 0);
1150 SSL.Abort_Undefer.all;
1153 end Suspend_Until_True;
1161 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
1162 pragma Unreferenced (Self_ID);
1167 --------------------
1168 -- Check_No_Locks --
1169 --------------------
1171 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
1172 pragma Unreferenced (Self_ID);
1177 ----------------------
1178 -- Environment_Task --
1179 ----------------------
1181 function Environment_Task return Task_Id is
1183 return Environment_Task_Id;
1184 end Environment_Task;
1190 function Suspend_Task
1192 Thread_Self : Thread_Id) return Boolean
1195 if T.Common.LL.Thread /= Thread_Self then
1196 return pthread_kill (T.Common.LL.Thread, SIGSTOP) = 0;
1206 function Resume_Task
1208 Thread_Self : Thread_Id) return Boolean
1211 if T.Common.LL.Thread /= Thread_Self then
1212 return pthread_kill (T.Common.LL.Thread, SIGCONT) = 0;
1218 --------------------
1219 -- Stop_All_Tasks --
1220 --------------------
1222 procedure Stop_All_Tasks is
1231 function Stop_Task (T : ST.Task_Id) return Boolean is
1232 pragma Unreferenced (T);
1241 function Continue_Task (T : ST.Task_Id) return Boolean is
1242 pragma Unreferenced (T);
1251 procedure Initialize (Environment_Task : Task_Id) is
1252 act : aliased struct_sigaction;
1253 old_act : aliased struct_sigaction;
1254 Tmp_Set : aliased sigset_t;
1255 Result : Interfaces.C.int;
1258 (Int : System.Interrupt_Management.Interrupt_ID) return Character;
1259 pragma Import (C, State, "__gnat_get_interrupt_state");
1260 -- Get interrupt state. Defined in a-init.c
1261 -- The input argument is the interrupt number,
1262 -- and the result is one of the following:
1264 Default : constant Character := 's';
1265 -- 'n' this interrupt not set by any Interrupt_State pragma
1266 -- 'u' Interrupt_State pragma set state to User
1267 -- 'r' Interrupt_State pragma set state to Runtime
1268 -- 's' Interrupt_State pragma set state to System (use "default"
1272 Environment_Task_Id := Environment_Task;
1274 Interrupt_Management.Initialize;
1276 -- Prepare the set of signals that should be unblocked in all tasks
1278 Result := sigemptyset (Unblocked_Signal_Mask'Access);
1279 pragma Assert (Result = 0);
1281 for J in Interrupt_Management.Interrupt_ID loop
1282 if System.Interrupt_Management.Keep_Unmasked (J) then
1283 Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
1284 pragma Assert (Result = 0);
1288 Result := pthread_mutexattr_init (Mutex_Attr'Access);
1289 pragma Assert (Result = 0);
1291 Result := pthread_condattr_init (Cond_Attr'Access);
1292 pragma Assert (Result = 0);
1294 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1296 -- Initialize the global RTS lock
1298 Specific.Initialize (Environment_Task);
1300 Enter_Task (Environment_Task);
1302 -- Install the abort-signal handler
1305 (System.Interrupt_Management.Abort_Task_Interrupt) /= Default
1308 act.sa_handler := Abort_Handler'Address;
1310 Result := sigemptyset (Tmp_Set'Access);
1311 pragma Assert (Result = 0);
1312 act.sa_mask := Tmp_Set;
1316 (Signal (Interrupt_Management.Abort_Task_Interrupt),
1317 act'Unchecked_Access,
1318 old_act'Unchecked_Access);
1319 pragma Assert (Result = 0);
1323 end System.Task_Primitives.Operations;