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) 1992-2004, 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, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, 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 DEC Unix 4.0d 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.Task_Info;
47 -- used for Task_Info_Type
50 -- used for Shift_Left
56 with System.Interrupt_Management;
57 -- used for Keep_Unmasked
58 -- Abort_Task_Interrupt
61 with System.Interrupt_Management.Operations;
62 -- used for Set_Interrupt_Mask
64 pragma Elaborate_All (System.Interrupt_Management.Operations);
66 with System.Parameters;
70 -- used for Ada_Task_Control_Block
72 -- ATCB components and types
74 with System.Soft_Links;
75 -- used for Defer/Undefer_Abort
77 -- Note that we do not use System.Tasking.Initialization directly since
78 -- this is a higher level package that we shouldn't depend on. For example
79 -- when using the restricted run time, it is replaced by
80 -- System.Tasking.Restricted.Initialization
82 with System.OS_Primitives;
83 -- used for Delay_Modes
85 with Unchecked_Deallocation;
87 package body System.Task_Primitives.Operations is
89 use System.Tasking.Debug;
92 use System.OS_Interface;
93 use System.Parameters;
94 use System.OS_Primitives;
96 package SSL renames System.Soft_Links;
102 -- The followings are logically constants, but need to be initialized
105 Single_RTS_Lock : aliased RTS_Lock;
106 -- This is a lock to allow only one thread of control in the RTS at
107 -- a time; it is used to execute in mutual exclusion from all other tasks.
108 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
110 ATCB_Key : aliased pthread_key_t;
111 -- Key used to find the Ada Task_ID associated with a thread
113 Environment_Task_ID : Task_ID;
114 -- A variable to hold Task_ID for the environment task.
116 Unblocked_Signal_Mask : aliased sigset_t;
117 -- The set of signals that should unblocked in all tasks
119 Time_Slice_Val : Integer;
120 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
122 Locking_Policy : Character;
123 pragma Import (C, Locking_Policy, "__gl_locking_policy");
125 Dispatching_Policy : Character;
126 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
128 FIFO_Within_Priorities : constant Boolean := Dispatching_Policy = 'F';
129 -- Indicates whether FIFO_Within_Priorities is set.
133 Foreign_Task_Elaborated : aliased Boolean := True;
134 -- Used to identified fake tasks (i.e., non-Ada Threads).
142 procedure Initialize (Environment_Task : Task_ID);
143 pragma Inline (Initialize);
144 -- Initialize various data needed by this package.
146 function Is_Valid_Task return Boolean;
147 pragma Inline (Is_Valid_Task);
148 -- Does executing thread have a TCB?
150 procedure Set (Self_Id : Task_ID);
152 -- Set the self id for the current task.
154 function Self return Task_ID;
155 pragma Inline (Self);
156 -- Return a pointer to the Ada Task Control Block of the calling task.
160 package body Specific is separate;
161 -- The body of this package is target specific.
163 ---------------------------------
164 -- Support for foreign threads --
165 ---------------------------------
167 function Register_Foreign_Thread (Thread : Thread_Id) return Task_ID;
168 -- Allocate and Initialize a new ATCB for the current Thread.
170 function Register_Foreign_Thread
171 (Thread : Thread_Id) return Task_ID is separate;
173 -----------------------
174 -- Local Subprograms --
175 -----------------------
177 procedure Abort_Handler (Sig : Signal);
178 -- Signal handler used to implement asynchronous abortion.
184 procedure Abort_Handler (Sig : Signal) is
185 pragma Unreferenced (Sig);
187 T : constant Task_ID := Self;
188 Result : Interfaces.C.int;
189 Old_Set : aliased sigset_t;
192 -- It is not safe to raise an exception when using ZCX and the GCC
193 -- exception handling mechanism.
195 if ZCX_By_Default and then GCC_ZCX_Support then
199 if T.Deferral_Level = 0
200 and then T.Pending_ATC_Level < T.ATC_Nesting_Level and then
205 -- Make sure signals used for RTS internal purpose are unmasked
207 Result := pthread_sigmask (SIG_UNBLOCK,
208 Unblocked_Signal_Mask'Unchecked_Access, Old_Set'Unchecked_Access);
209 pragma Assert (Result = 0);
211 raise Standard'Abort_Signal;
219 -- The underlying thread system sets a guard page at the
220 -- bottom of a thread stack, so nothing is needed.
222 procedure Stack_Guard (T : ST.Task_ID; On : Boolean) is
223 pragma Unreferenced (T);
224 pragma Unreferenced (On);
234 function Get_Thread_Id (T : ST.Task_ID) return OSI.Thread_Id is
236 return T.Common.LL.Thread;
243 function Self return Task_ID renames Specific.Self;
245 ---------------------
246 -- Initialize_Lock --
247 ---------------------
249 -- Note: mutexes and cond_variables needed per-task basis are
250 -- initialized in Initialize_TCB and the Storage_Error is
251 -- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
252 -- used in RTS is initialized before any status change of RTS.
253 -- Therefore rasing Storage_Error in the following routines
254 -- should be able to be handled safely.
256 procedure Initialize_Lock
257 (Prio : System.Any_Priority;
260 Attributes : aliased pthread_mutexattr_t;
261 Result : Interfaces.C.int;
264 Result := pthread_mutexattr_init (Attributes'Access);
265 pragma Assert (Result = 0 or else Result = ENOMEM);
267 if Result = ENOMEM then
271 if Locking_Policy = 'C' then
272 L.Ceiling := Interfaces.C.int (Prio);
275 Result := pthread_mutex_init (L.L'Access, Attributes'Access);
276 pragma Assert (Result = 0 or else Result = ENOMEM);
278 if Result = ENOMEM then
279 Result := pthread_mutexattr_destroy (Attributes'Access);
283 Result := pthread_mutexattr_destroy (Attributes'Access);
284 pragma Assert (Result = 0);
287 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
288 pragma Unreferenced (Level);
290 Attributes : aliased pthread_mutexattr_t;
291 Result : Interfaces.C.int;
294 Result := pthread_mutexattr_init (Attributes'Access);
295 pragma Assert (Result = 0 or else Result = ENOMEM);
297 if Result = ENOMEM then
301 Result := pthread_mutex_init (L, Attributes'Access);
302 pragma Assert (Result = 0 or else Result = ENOMEM);
304 if Result = ENOMEM then
305 Result := pthread_mutexattr_destroy (Attributes'Access);
309 Result := pthread_mutexattr_destroy (Attributes'Access);
310 pragma Assert (Result = 0);
317 procedure Finalize_Lock (L : access Lock) is
318 Result : Interfaces.C.int;
320 Result := pthread_mutex_destroy (L.L'Access);
321 pragma Assert (Result = 0);
324 procedure Finalize_Lock (L : access RTS_Lock) is
325 Result : Interfaces.C.int;
327 Result := pthread_mutex_destroy (L);
328 pragma Assert (Result = 0);
335 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
336 Result : Interfaces.C.int;
338 All_Tasks_Link : Task_ID;
339 Current_Prio : System.Any_Priority;
342 -- Perform ceiling checks only when this is the locking policy in use.
344 if Locking_Policy = 'C' then
346 All_Tasks_Link := Self_ID.Common.All_Tasks_Link;
347 Current_Prio := Get_Priority (Self_ID);
349 -- If there is no other task, no need to check priorities
351 if All_Tasks_Link /= Null_Task
352 and then L.Ceiling < Interfaces.C.int (Current_Prio)
354 Ceiling_Violation := True;
359 Result := pthread_mutex_lock (L.L'Access);
360 pragma Assert (Result = 0);
362 Ceiling_Violation := False;
366 (L : access RTS_Lock; Global_Lock : Boolean := False)
368 Result : Interfaces.C.int;
370 if not Single_Lock or else Global_Lock then
371 Result := pthread_mutex_lock (L);
372 pragma Assert (Result = 0);
376 procedure Write_Lock (T : Task_ID) is
377 Result : Interfaces.C.int;
379 if not Single_Lock then
380 Result := pthread_mutex_lock (T.Common.LL.L'Access);
381 pragma Assert (Result = 0);
389 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
391 Write_Lock (L, Ceiling_Violation);
398 procedure Unlock (L : access Lock) is
399 Result : Interfaces.C.int;
401 Result := pthread_mutex_unlock (L.L'Access);
402 pragma Assert (Result = 0);
405 procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
406 Result : Interfaces.C.int;
408 if not Single_Lock or else Global_Lock then
409 Result := pthread_mutex_unlock (L);
410 pragma Assert (Result = 0);
414 procedure Unlock (T : Task_ID) is
415 Result : Interfaces.C.int;
417 if not Single_Lock then
418 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
419 pragma Assert (Result = 0);
429 Reason : System.Tasking.Task_States)
431 pragma Unreferenced (Reason);
433 Result : Interfaces.C.int;
437 Result := pthread_cond_wait
438 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
440 Result := pthread_cond_wait
441 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
444 -- EINTR is not considered a failure.
446 pragma Assert (Result = 0 or else Result = EINTR);
453 -- This is for use within the run-time system, so abort is
454 -- assumed to be already deferred, and the caller should be
455 -- holding its own ATCB lock.
457 procedure Timed_Sleep
460 Mode : ST.Delay_Modes;
461 Reason : System.Tasking.Task_States;
462 Timedout : out Boolean;
463 Yielded : out Boolean)
465 pragma Unreferenced (Reason);
467 Check_Time : constant Duration := Monotonic_Clock;
469 Request : aliased timespec;
470 Result : Interfaces.C.int;
476 if Mode = Relative then
477 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
479 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
482 if Abs_Time > Check_Time then
483 Request := To_Timespec (Abs_Time);
486 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
487 or else Self_ID.Pending_Priority_Change;
490 Result := pthread_cond_timedwait
491 (Self_ID.Common.LL.CV'Access,
492 Single_RTS_Lock'Access,
496 Result := pthread_cond_timedwait
497 (Self_ID.Common.LL.CV'Access,
498 Self_ID.Common.LL.L'Access,
502 exit when Abs_Time <= Monotonic_Clock;
504 if Result = 0 or Result = EINTR then
506 -- Somebody may have called Wakeup for us
512 pragma Assert (Result = ETIMEDOUT);
521 -- This is for use in implementing delay statements, so
522 -- we assume the caller is abort-deferred but is holding
525 procedure Timed_Delay
528 Mode : ST.Delay_Modes)
530 Check_Time : constant Duration := Monotonic_Clock;
532 Request : aliased timespec;
533 Result : Interfaces.C.int;
536 -- Only the little window between deferring abort and
537 -- locking Self_ID is the reason we need to
538 -- check for pending abort and priority change below! :(
546 Write_Lock (Self_ID);
548 if Mode = Relative then
549 Abs_Time := Time + Check_Time;
551 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
554 if Abs_Time > Check_Time then
555 Request := To_Timespec (Abs_Time);
556 Self_ID.Common.State := Delay_Sleep;
559 if Self_ID.Pending_Priority_Change then
560 Self_ID.Pending_Priority_Change := False;
561 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
562 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
565 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
568 Result := pthread_cond_timedwait
569 (Self_ID.Common.LL.CV'Access,
570 Single_RTS_Lock'Access,
573 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
574 Self_ID.Common.LL.L'Access, Request'Access);
577 exit when Abs_Time <= Monotonic_Clock;
579 pragma Assert (Result = 0 or else
580 Result = ETIMEDOUT or else
584 Self_ID.Common.State := Runnable;
594 SSL.Abort_Undefer.all;
597 ---------------------
598 -- Monotonic_Clock --
599 ---------------------
601 function Monotonic_Clock return Duration is
602 TS : aliased timespec;
603 Result : Interfaces.C.int;
606 Result := clock_gettime (CLOCK_REALTIME, TS'Unchecked_Access);
607 pragma Assert (Result = 0);
608 return To_Duration (TS);
615 function RT_Resolution return Duration is
617 return 1.0 / 1024.0; -- Clock on DEC Alpha ticks at 1024 Hz
624 procedure Wakeup (T : Task_ID; Reason : System.Tasking.Task_States) is
625 pragma Unreferenced (Reason);
626 Result : Interfaces.C.int;
628 Result := pthread_cond_signal (T.Common.LL.CV'Access);
629 pragma Assert (Result = 0);
636 procedure Yield (Do_Yield : Boolean := True) is
637 Result : Interfaces.C.int;
638 pragma Unreferenced (Result);
641 Result := sched_yield;
649 procedure Set_Priority
651 Prio : System.Any_Priority;
652 Loss_Of_Inheritance : Boolean := False)
654 pragma Unreferenced (Loss_Of_Inheritance);
656 Result : Interfaces.C.int;
657 Param : aliased struct_sched_param;
660 T.Common.Current_Priority := Prio;
661 Param.sched_priority := Interfaces.C.int (Underlying_Priorities (Prio));
663 if Time_Slice_Val > 0 then
664 Result := pthread_setschedparam
665 (T.Common.LL.Thread, SCHED_RR, Param'Access);
667 elsif FIFO_Within_Priorities or else Time_Slice_Val = 0 then
668 Result := pthread_setschedparam
669 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
672 Result := pthread_setschedparam
673 (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
676 pragma Assert (Result = 0);
683 function Get_Priority (T : Task_ID) return System.Any_Priority is
685 return T.Common.Current_Priority;
692 procedure Enter_Task (Self_ID : Task_ID) is
694 Self_ID.Common.LL.Thread := pthread_self;
695 Specific.Set (Self_ID);
699 for J in Known_Tasks'Range loop
700 if Known_Tasks (J) = null then
701 Known_Tasks (J) := Self_ID;
702 Self_ID.Known_Tasks_Index := J;
714 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_ID is
716 return new Ada_Task_Control_Block (Entry_Num);
723 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
725 -----------------------------
726 -- Register_Foreign_Thread --
727 -----------------------------
729 function Register_Foreign_Thread return Task_ID is
731 if Is_Valid_Task then
734 return Register_Foreign_Thread (pthread_self);
736 end Register_Foreign_Thread;
742 procedure Initialize_TCB (Self_ID : Task_ID; Succeeded : out Boolean) is
743 Mutex_Attr : aliased pthread_mutexattr_t;
744 Result : Interfaces.C.int;
745 Cond_Attr : aliased pthread_condattr_t;
748 if not Single_Lock then
749 Result := pthread_mutexattr_init (Mutex_Attr'Access);
750 pragma Assert (Result = 0 or else Result = ENOMEM);
753 Result := pthread_mutex_init
754 (Self_ID.Common.LL.L'Access, Mutex_Attr'Access);
755 pragma Assert (Result = 0 or else Result = ENOMEM);
763 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
764 pragma Assert (Result = 0);
767 Result := pthread_condattr_init (Cond_Attr'Access);
768 pragma Assert (Result = 0 or else Result = ENOMEM);
771 Result := pthread_cond_init
772 (Self_ID.Common.LL.CV'Access, Cond_Attr'Access);
773 pragma Assert (Result = 0 or else Result = ENOMEM);
779 if not Single_Lock then
780 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
781 pragma Assert (Result = 0);
787 Result := pthread_condattr_destroy (Cond_Attr'Access);
788 pragma Assert (Result = 0);
795 procedure Create_Task
797 Wrapper : System.Address;
798 Stack_Size : System.Parameters.Size_Type;
799 Priority : System.Any_Priority;
800 Succeeded : out Boolean)
802 Attributes : aliased pthread_attr_t;
803 Adjusted_Stack_Size : Interfaces.C.size_t;
804 Result : Interfaces.C.int;
805 Param : aliased System.OS_Interface.struct_sched_param;
807 use System.Task_Info;
810 if Stack_Size = Unspecified_Size then
811 Adjusted_Stack_Size := Interfaces.C.size_t (Default_Stack_Size);
813 elsif Stack_Size < Minimum_Stack_Size then
814 Adjusted_Stack_Size := Interfaces.C.size_t (Minimum_Stack_Size);
817 Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
820 Result := pthread_attr_init (Attributes'Access);
821 pragma Assert (Result = 0 or else Result = ENOMEM);
828 Result := pthread_attr_setdetachstate
829 (Attributes'Access, PTHREAD_CREATE_DETACHED);
830 pragma Assert (Result = 0);
832 Result := pthread_attr_setstacksize
833 (Attributes'Access, Adjusted_Stack_Size);
834 pragma Assert (Result = 0);
836 Param.sched_priority :=
837 Interfaces.C.int (Underlying_Priorities (Priority));
838 Result := pthread_attr_setschedparam
839 (Attributes'Access, Param'Access);
840 pragma Assert (Result = 0);
842 if Time_Slice_Val > 0 then
843 Result := pthread_attr_setschedpolicy
844 (Attributes'Access, System.OS_Interface.SCHED_RR);
846 elsif FIFO_Within_Priorities or else Time_Slice_Val = 0 then
847 Result := pthread_attr_setschedpolicy
848 (Attributes'Access, System.OS_Interface.SCHED_FIFO);
851 Result := pthread_attr_setschedpolicy
852 (Attributes'Access, System.OS_Interface.SCHED_OTHER);
855 pragma Assert (Result = 0);
857 -- Set the scheduling parameters explicitly, since this is the
858 -- only way to force the OS to take e.g. the sched policy and scope
859 -- attributes into account.
861 Result := pthread_attr_setinheritsched
862 (Attributes'Access, PTHREAD_EXPLICIT_SCHED);
863 pragma Assert (Result = 0);
865 T.Common.Current_Priority := Priority;
867 if T.Common.Task_Info /= null then
868 case T.Common.Task_Info.Contention_Scope is
869 when System.Task_Info.Process_Scope =>
870 Result := pthread_attr_setscope
871 (Attributes'Access, PTHREAD_SCOPE_PROCESS);
873 when System.Task_Info.System_Scope =>
874 Result := pthread_attr_setscope
875 (Attributes'Access, PTHREAD_SCOPE_SYSTEM);
877 when System.Task_Info.Default_Scope =>
881 pragma Assert (Result = 0);
884 -- Since the initial signal mask of a thread is inherited from the
885 -- creator, and the Environment task has all its signals masked, we
886 -- do not need to manipulate caller's signal mask at this point.
887 -- All tasks in RTS will have All_Tasks_Mask initially.
889 Result := pthread_create
890 (T.Common.LL.Thread'Access,
892 Thread_Body_Access (Wrapper),
894 pragma Assert (Result = 0 or else Result = EAGAIN);
896 Succeeded := Result = 0;
898 Result := pthread_attr_destroy (Attributes'Access);
899 pragma Assert (Result = 0);
901 if T.Common.Task_Info /= null then
902 -- ??? We're using a process-wide function to implement a task
903 -- specific characteristic.
905 if T.Common.Task_Info.Bind_To_Cpu_Number = 0 then
906 Result := bind_to_cpu (Curpid, 0);
907 elsif T.Common.Task_Info.Bind_To_Cpu_Number > 0 then
908 Result := bind_to_cpu
910 Interfaces.C.unsigned_long (
911 Interfaces.Shift_Left
912 (Interfaces.Unsigned_64'(1),
913 T.Common.Task_Info.Bind_To_Cpu_Number - 1)));
914 pragma Assert (Result = 0);
923 procedure Finalize_TCB (T : Task_ID) is
924 Result : Interfaces.C.int;
926 Is_Self : constant Boolean := T = Self;
928 procedure Free is new
929 Unchecked_Deallocation (Ada_Task_Control_Block, Task_ID);
932 if not Single_Lock then
933 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
934 pragma Assert (Result = 0);
937 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
938 pragma Assert (Result = 0);
940 if T.Known_Tasks_Index /= -1 then
941 Known_Tasks (T.Known_Tasks_Index) := null;
955 procedure Exit_Task is
964 procedure Abort_Task (T : Task_ID) is
965 Result : Interfaces.C.int;
970 Signal (System.Interrupt_Management.Abort_Task_Interrupt));
971 pragma Assert (Result = 0);
980 function Check_Exit (Self_ID : ST.Task_ID) return Boolean is
981 pragma Unreferenced (Self_ID);
991 function Check_No_Locks (Self_ID : ST.Task_ID) return Boolean is
992 pragma Unreferenced (Self_ID);
998 ----------------------
999 -- Environment_Task --
1000 ----------------------
1002 function Environment_Task return Task_ID is
1004 return Environment_Task_ID;
1005 end Environment_Task;
1011 procedure Lock_RTS is
1013 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
1020 procedure Unlock_RTS is
1022 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
1029 function Suspend_Task
1031 Thread_Self : Thread_Id) return Boolean
1033 pragma Warnings (Off, T);
1034 pragma Warnings (Off, Thread_Self);
1044 function Resume_Task
1046 Thread_Self : Thread_Id) return Boolean
1048 pragma Warnings (Off, T);
1049 pragma Warnings (Off, Thread_Self);
1059 procedure Initialize (Environment_Task : Task_ID) is
1060 act : aliased struct_sigaction;
1061 old_act : aliased struct_sigaction;
1062 Tmp_Set : aliased sigset_t;
1063 Result : Interfaces.C.int;
1066 (Int : System.Interrupt_Management.Interrupt_ID) return Character;
1067 pragma Import (C, State, "__gnat_get_interrupt_state");
1068 -- Get interrupt state. Defined in a-init.c. The input argument is
1069 -- the interrupt number, and the result is one of the following:
1071 Default : constant Character := 's';
1072 -- 'n' this interrupt not set by any Interrupt_State pragma
1073 -- 'u' Interrupt_State pragma set state to User
1074 -- 'r' Interrupt_State pragma set state to Runtime
1075 -- 's' Interrupt_State pragma set state to System (use "default"
1079 Environment_Task_ID := Environment_Task;
1081 -- Initialize the lock used to synchronize chain of all ATCBs.
1083 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1085 Specific.Initialize (Environment_Task);
1087 Enter_Task (Environment_Task);
1089 -- Install the abort-signal handler
1091 if State (System.Interrupt_Management.Abort_Task_Interrupt)
1095 act.sa_handler := Abort_Handler'Address;
1097 Result := sigemptyset (Tmp_Set'Access);
1098 pragma Assert (Result = 0);
1099 act.sa_mask := Tmp_Set;
1103 (Signal (System.Interrupt_Management.Abort_Task_Interrupt),
1104 act'Unchecked_Access,
1105 old_act'Unchecked_Access);
1106 pragma Assert (Result = 0);
1112 Result : Interfaces.C.int;
1115 -- Mask Environment task for all signals. The original mask of the
1116 -- Environment task will be recovered by Interrupt_Server task
1117 -- during the elaboration of s-interr.adb.
1119 System.Interrupt_Management.Operations.Set_Interrupt_Mask
1120 (System.Interrupt_Management.Operations.All_Tasks_Mask'Access);
1122 -- Prepare the set of signals that should unblocked in all tasks
1124 Result := sigemptyset (Unblocked_Signal_Mask'Access);
1125 pragma Assert (Result = 0);
1127 for J in Interrupt_Management.Interrupt_ID loop
1128 if System.Interrupt_Management.Keep_Unmasked (J) then
1129 Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
1130 pragma Assert (Result = 0);
1136 end System.Task_Primitives.Operations;