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 GNU/Linux (GNU/LinuxThreads) 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
50 with System.Interrupt_Management;
51 -- used for Keep_Unmasked
52 -- Abort_Task_Interrupt
55 with System.Interrupt_Management.Operations;
56 -- used for Set_Interrupt_Mask
58 pragma Elaborate_All (System.Interrupt_Management.Operations);
60 with System.Parameters;
64 -- used for Ada_Task_Control_Block
68 -- used for Raise_Exception
69 -- Raise_From_Signal_Handler
72 with System.Soft_Links;
73 -- used for Defer/Undefer_Abort
75 -- Note that we do not use System.Tasking.Initialization directly since
76 -- this is a higher level package that we shouldn't depend on. For example
77 -- when using the restricted run time, it is replaced by
78 -- System.Tasking.Restricted.Stages.
80 with System.OS_Primitives;
81 -- used for Delay_Modes
83 with System.Soft_Links;
84 -- used for Get_Machine_State_Addr
86 with Unchecked_Conversion;
87 with Unchecked_Deallocation;
89 package body System.Task_Primitives.Operations is
91 use System.Tasking.Debug;
94 use System.OS_Interface;
95 use System.Parameters;
96 use System.OS_Primitives;
98 package SSL renames System.Soft_Links;
104 -- The followings are logically constants, but need to be initialized
107 Single_RTS_Lock : aliased RTS_Lock;
108 -- This is a lock to allow only one thread of control in the RTS at
109 -- a time; it is used to execute in mutual exclusion from all other tasks.
110 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
112 ATCB_Key : aliased pthread_key_t;
113 -- Key used to find the Ada Task_Id associated with a thread
115 Environment_Task_Id : Task_Id;
116 -- A variable to hold Task_Id for the environment task
118 Unblocked_Signal_Mask : aliased sigset_t;
119 -- The set of signals that should unblocked in all tasks
121 -- The followings are internal configuration constants needed
123 Priority_Ceiling_Emulation : constant Boolean := True;
125 Next_Serial_Number : Task_Serial_Number := 100;
126 -- We start at 100, to reserve some special values for
127 -- using in error checking.
129 Time_Slice_Val : Integer;
130 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
132 Dispatching_Policy : Character;
133 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
135 FIFO_Within_Priorities : constant Boolean := Dispatching_Policy = 'F';
136 -- Indicates whether FIFO_Within_Priorities is set
138 -- The following are effectively constants, but they need to
139 -- be initialized by calling a pthread_ function.
141 Mutex_Attr : aliased pthread_mutexattr_t;
142 Cond_Attr : aliased pthread_condattr_t;
144 Foreign_Task_Elaborated : aliased Boolean := True;
145 -- Used to identified fake tasks (i.e., non-Ada Threads)
153 procedure Initialize (Environment_Task : Task_Id);
154 pragma Inline (Initialize);
155 -- Initialize various data needed by this package
157 function Is_Valid_Task return Boolean;
158 pragma Inline (Is_Valid_Task);
159 -- Does executing thread have a TCB?
161 procedure Set (Self_Id : Task_Id);
163 -- Set the self id for the current task
165 function Self return Task_Id;
166 pragma Inline (Self);
167 -- Return a pointer to the Ada Task Control Block of the calling task.
171 package body Specific is separate;
172 -- The body of this package is target specific
174 ---------------------------------
175 -- Support for foreign threads --
176 ---------------------------------
178 function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
179 -- Allocate and Initialize a new ATCB for the current Thread
181 function Register_Foreign_Thread
182 (Thread : Thread_Id) return Task_Id is separate;
184 -----------------------
185 -- Local Subprograms --
186 -----------------------
188 subtype unsigned_long is Interfaces.C.unsigned_long;
190 procedure Abort_Handler (signo : Signal);
192 function To_pthread_t is new Unchecked_Conversion
193 (unsigned_long, System.OS_Interface.pthread_t);
199 procedure Abort_Handler (signo : Signal) is
200 pragma Unreferenced (signo);
202 Self_Id : constant Task_Id := Self;
203 Result : Interfaces.C.int;
204 Old_Set : aliased sigset_t;
207 if ZCX_By_Default and then GCC_ZCX_Support then
211 if Self_Id.Deferral_Level = 0
212 and then Self_Id.Pending_ATC_Level < Self_Id.ATC_Nesting_Level
213 and then not Self_Id.Aborting
215 Self_Id.Aborting := True;
217 -- Make sure signals used for RTS internal purpose are unmasked
219 Result := pthread_sigmask (SIG_UNBLOCK,
220 Unblocked_Signal_Mask'Unchecked_Access, Old_Set'Unchecked_Access);
221 pragma Assert (Result = 0);
223 raise Standard'Abort_Signal;
231 procedure Lock_RTS is
233 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
240 procedure Unlock_RTS is
242 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
249 -- The underlying thread system extends the memory (up to 2MB) when needed
251 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
252 pragma Unreferenced (T);
253 pragma Unreferenced (On);
262 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
264 return T.Common.LL.Thread;
271 function Self return Task_Id renames Specific.Self;
273 ---------------------
274 -- Initialize_Lock --
275 ---------------------
277 -- Note: mutexes and cond_variables needed per-task basis are
278 -- initialized in Initialize_TCB and the Storage_Error is
279 -- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
280 -- used in RTS is initialized before any status change of RTS.
281 -- Therefore rasing Storage_Error in the following routines
282 -- should be able to be handled safely.
284 procedure Initialize_Lock
285 (Prio : System.Any_Priority;
288 Result : Interfaces.C.int;
291 if Priority_Ceiling_Emulation then
295 Result := pthread_mutex_init (L.L'Access, Mutex_Attr'Access);
297 pragma Assert (Result = 0 or else Result = ENOMEM);
299 if Result = ENOMEM then
300 Ada.Exceptions.Raise_Exception (Storage_Error'Identity,
301 "Failed to allocate a lock");
305 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
306 pragma Unreferenced (Level);
308 Result : Interfaces.C.int;
311 Result := pthread_mutex_init (L, Mutex_Attr'Access);
313 pragma Assert (Result = 0 or else Result = ENOMEM);
315 if Result = ENOMEM then
324 procedure Finalize_Lock (L : access Lock) is
325 Result : Interfaces.C.int;
327 Result := pthread_mutex_destroy (L.L'Access);
328 pragma Assert (Result = 0);
331 procedure Finalize_Lock (L : access RTS_Lock) is
332 Result : Interfaces.C.int;
334 Result := pthread_mutex_destroy (L);
335 pragma Assert (Result = 0);
342 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
343 Result : Interfaces.C.int;
346 if Priority_Ceiling_Emulation then
348 Self_ID : constant Task_Id := Self;
351 if Self_ID.Common.LL.Active_Priority > L.Ceiling then
352 Ceiling_Violation := True;
356 L.Saved_Priority := Self_ID.Common.LL.Active_Priority;
358 if Self_ID.Common.LL.Active_Priority < L.Ceiling then
359 Self_ID.Common.LL.Active_Priority := L.Ceiling;
362 Result := pthread_mutex_lock (L.L'Access);
363 pragma Assert (Result = 0);
364 Ceiling_Violation := False;
368 Result := pthread_mutex_lock (L.L'Access);
369 Ceiling_Violation := Result = EINVAL;
371 -- Assume the cause of EINVAL is a priority ceiling violation
373 pragma Assert (Result = 0 or else Result = EINVAL);
378 (L : access RTS_Lock;
379 Global_Lock : Boolean := False)
381 Result : Interfaces.C.int;
383 if not Single_Lock or else Global_Lock then
384 Result := pthread_mutex_lock (L);
385 pragma Assert (Result = 0);
389 procedure Write_Lock (T : Task_Id) is
390 Result : Interfaces.C.int;
392 if not Single_Lock then
393 Result := pthread_mutex_lock (T.Common.LL.L'Access);
394 pragma Assert (Result = 0);
402 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
404 Write_Lock (L, Ceiling_Violation);
411 procedure Unlock (L : access Lock) is
412 Result : Interfaces.C.int;
415 if Priority_Ceiling_Emulation then
417 Self_ID : constant Task_Id := Self;
420 Result := pthread_mutex_unlock (L.L'Access);
421 pragma Assert (Result = 0);
423 if Self_ID.Common.LL.Active_Priority > L.Saved_Priority then
424 Self_ID.Common.LL.Active_Priority := L.Saved_Priority;
429 Result := pthread_mutex_unlock (L.L'Access);
430 pragma Assert (Result = 0);
434 procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
435 Result : Interfaces.C.int;
437 if not Single_Lock or else Global_Lock then
438 Result := pthread_mutex_unlock (L);
439 pragma Assert (Result = 0);
443 procedure Unlock (T : Task_Id) is
444 Result : Interfaces.C.int;
446 if not Single_Lock then
447 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
448 pragma Assert (Result = 0);
458 Reason : System.Tasking.Task_States)
460 pragma Unreferenced (Reason);
462 Result : Interfaces.C.int;
465 pragma Assert (Self_ID = Self);
468 Result := pthread_cond_wait
469 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
471 Result := pthread_cond_wait
472 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
475 -- EINTR is not considered a failure
477 pragma Assert (Result = 0 or else Result = EINTR);
484 -- This is for use within the run-time system, so abort is
485 -- assumed to be already deferred, and the caller should be
486 -- holding its own ATCB lock.
488 procedure Timed_Sleep
491 Mode : ST.Delay_Modes;
492 Reason : System.Tasking.Task_States;
493 Timedout : out Boolean;
494 Yielded : out Boolean)
496 pragma Unreferenced (Reason);
498 Check_Time : constant Duration := Monotonic_Clock;
500 Request : aliased timespec;
501 Result : Interfaces.C.int;
507 if Mode = Relative then
508 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
510 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
513 if Abs_Time > Check_Time then
514 Request := To_Timespec (Abs_Time);
517 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
518 or else Self_ID.Pending_Priority_Change;
521 Result := pthread_cond_timedwait
522 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access,
526 Result := pthread_cond_timedwait
527 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
531 exit when Abs_Time <= Monotonic_Clock;
533 if Result = 0 or Result = EINTR then
534 -- somebody may have called Wakeup for us
539 pragma Assert (Result = ETIMEDOUT);
548 -- This is for use in implementing delay statements, so
549 -- we assume the caller is abort-deferred but is holding
552 procedure Timed_Delay
555 Mode : ST.Delay_Modes)
557 Check_Time : constant Duration := Monotonic_Clock;
559 Request : aliased timespec;
560 Result : Interfaces.C.int;
563 -- Only the little window between deferring abort and
564 -- locking Self_ID is the reason we need to
565 -- check for pending abort and priority change below! :(
573 Write_Lock (Self_ID);
575 if Mode = Relative then
576 Abs_Time := Time + Check_Time;
578 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
581 if Abs_Time > Check_Time then
582 Request := To_Timespec (Abs_Time);
583 Self_ID.Common.State := Delay_Sleep;
586 if Self_ID.Pending_Priority_Change then
587 Self_ID.Pending_Priority_Change := False;
588 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
589 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
592 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
595 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
596 Single_RTS_Lock'Access, Request'Access);
598 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
599 Self_ID.Common.LL.L'Access, Request'Access);
602 exit when Abs_Time <= Monotonic_Clock;
604 pragma Assert (Result = 0 or else
605 Result = ETIMEDOUT or else
609 Self_ID.Common.State := Runnable;
618 Result := sched_yield;
619 SSL.Abort_Undefer.all;
622 ---------------------
623 -- Monotonic_Clock --
624 ---------------------
626 function Monotonic_Clock return Duration is
627 TV : aliased struct_timeval;
628 Result : Interfaces.C.int;
630 Result := gettimeofday (TV'Access, System.Null_Address);
631 pragma Assert (Result = 0);
632 return To_Duration (TV);
639 function RT_Resolution return Duration is
648 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
649 pragma Unreferenced (Reason);
650 Result : Interfaces.C.int;
652 Result := pthread_cond_signal (T.Common.LL.CV'Access);
653 pragma Assert (Result = 0);
660 procedure Yield (Do_Yield : Boolean := True) is
661 Result : Interfaces.C.int;
662 pragma Unreferenced (Result);
665 Result := sched_yield;
673 procedure Set_Priority
675 Prio : System.Any_Priority;
676 Loss_Of_Inheritance : Boolean := False)
678 pragma Unreferenced (Loss_Of_Inheritance);
680 Result : Interfaces.C.int;
681 Param : aliased struct_sched_param;
684 T.Common.Current_Priority := Prio;
686 if Priority_Ceiling_Emulation then
687 if T.Common.LL.Active_Priority < Prio then
688 T.Common.LL.Active_Priority := Prio;
692 -- Priorities are in range 1 .. 99 on GNU/Linux, so we map
693 -- map 0 .. 31 to 1 .. 32
695 Param.sched_priority := Interfaces.C.int (Prio) + 1;
697 if Time_Slice_Val > 0 then
698 Result := pthread_setschedparam
699 (T.Common.LL.Thread, SCHED_RR, Param'Access);
701 elsif FIFO_Within_Priorities or else Time_Slice_Val = 0 then
702 Result := pthread_setschedparam
703 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
706 Param.sched_priority := 0;
707 Result := pthread_setschedparam
708 (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
711 pragma Assert (Result = 0 or else Result = EPERM);
718 function Get_Priority (T : Task_Id) return System.Any_Priority is
720 return T.Common.Current_Priority;
727 procedure Enter_Task (Self_ID : Task_Id) is
729 Self_ID.Common.LL.Thread := pthread_self;
731 Specific.Set (Self_ID);
735 for J in Known_Tasks'Range loop
736 if Known_Tasks (J) = null then
737 Known_Tasks (J) := Self_ID;
738 Self_ID.Known_Tasks_Index := J;
750 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
752 return new Ada_Task_Control_Block (Entry_Num);
759 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
761 -----------------------------
762 -- Register_Foreign_Thread --
763 -----------------------------
765 function Register_Foreign_Thread return Task_Id is
767 if Is_Valid_Task then
770 return Register_Foreign_Thread (pthread_self);
772 end Register_Foreign_Thread;
778 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
779 Result : Interfaces.C.int;
782 -- Give the task a unique serial number
784 Self_ID.Serial_Number := Next_Serial_Number;
785 Next_Serial_Number := Next_Serial_Number + 1;
786 pragma Assert (Next_Serial_Number /= 0);
788 Self_ID.Common.LL.Thread := To_pthread_t (-1);
790 if not Single_Lock then
791 Result := pthread_mutex_init (Self_ID.Common.LL.L'Access,
793 pragma Assert (Result = 0 or else Result = ENOMEM);
801 Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
803 pragma Assert (Result = 0 or else Result = ENOMEM);
808 if not Single_Lock then
809 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
810 pragma Assert (Result = 0);
821 procedure Create_Task
823 Wrapper : System.Address;
824 Stack_Size : System.Parameters.Size_Type;
825 Priority : System.Any_Priority;
826 Succeeded : out Boolean)
828 Adjusted_Stack_Size : Interfaces.C.size_t;
830 Attributes : aliased pthread_attr_t;
831 Result : Interfaces.C.int;
834 if Stack_Size = Unspecified_Size then
835 Adjusted_Stack_Size := Interfaces.C.size_t (Default_Stack_Size);
837 elsif Stack_Size < Minimum_Stack_Size then
838 Adjusted_Stack_Size := Interfaces.C.size_t (Minimum_Stack_Size);
841 Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
844 Result := pthread_attr_init (Attributes'Access);
845 pragma Assert (Result = 0 or else Result = ENOMEM);
853 pthread_attr_setstacksize
854 (Attributes'Access, Adjusted_Stack_Size);
855 pragma Assert (Result = 0);
858 pthread_attr_setdetachstate
859 (Attributes'Access, PTHREAD_CREATE_DETACHED);
860 pragma Assert (Result = 0);
862 -- Since the initial signal mask of a thread is inherited from the
863 -- creator, and the Environment task has all its signals masked, we
864 -- do not need to manipulate caller's signal mask at this point.
865 -- All tasks in RTS will have All_Tasks_Mask initially.
867 Result := pthread_create
868 (T.Common.LL.Thread'Access,
870 Thread_Body_Access (Wrapper),
872 pragma Assert (Result = 0 or else Result = EAGAIN);
874 Succeeded := Result = 0;
876 Result := pthread_attr_destroy (Attributes'Access);
877 pragma Assert (Result = 0);
879 Set_Priority (T, Priority);
886 procedure Finalize_TCB (T : Task_Id) is
887 Result : Interfaces.C.int;
889 Is_Self : constant Boolean := T = Self;
891 procedure Free is new
892 Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
895 if not Single_Lock then
896 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
897 pragma Assert (Result = 0);
900 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
901 pragma Assert (Result = 0);
903 if T.Known_Tasks_Index /= -1 then
904 Known_Tasks (T.Known_Tasks_Index) := null;
918 procedure Exit_Task is
927 procedure Abort_Task (T : Task_Id) is
928 Result : Interfaces.C.int;
930 Result := pthread_kill (T.Common.LL.Thread,
931 Signal (System.Interrupt_Management.Abort_Task_Interrupt));
932 pragma Assert (Result = 0);
941 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
942 pragma Unreferenced (Self_ID);
951 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
952 pragma Unreferenced (Self_ID);
957 ----------------------
958 -- Environment_Task --
959 ----------------------
961 function Environment_Task return Task_Id is
963 return Environment_Task_Id;
964 end Environment_Task;
970 function Suspend_Task
972 Thread_Self : Thread_Id) return Boolean
975 if T.Common.LL.Thread /= Thread_Self then
976 return pthread_kill (T.Common.LL.Thread, SIGSTOP) = 0;
988 Thread_Self : Thread_Id) return Boolean
991 if T.Common.LL.Thread /= Thread_Self then
992 return pthread_kill (T.Common.LL.Thread, SIGCONT) = 0;
1002 procedure Initialize (Environment_Task : Task_Id) is
1003 act : aliased struct_sigaction;
1004 old_act : aliased struct_sigaction;
1005 Tmp_Set : aliased sigset_t;
1006 Result : Interfaces.C.int;
1009 (Int : System.Interrupt_Management.Interrupt_ID) return Character;
1010 pragma Import (C, State, "__gnat_get_interrupt_state");
1011 -- Get interrupt state. Defined in a-init.c
1012 -- The input argument is the interrupt number,
1013 -- and the result is one of the following:
1015 Default : constant Character := 's';
1016 -- 'n' this interrupt not set by any Interrupt_State pragma
1017 -- 'u' Interrupt_State pragma set state to User
1018 -- 'r' Interrupt_State pragma set state to Runtime
1019 -- 's' Interrupt_State pragma set state to System (use "default"
1023 Environment_Task_Id := Environment_Task;
1025 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1027 -- Initialize the global RTS lock
1029 Specific.Initialize (Environment_Task);
1031 Enter_Task (Environment_Task);
1033 -- Install the abort-signal handler
1035 if State (System.Interrupt_Management.Abort_Task_Interrupt)
1039 act.sa_handler := Abort_Handler'Address;
1041 Result := sigemptyset (Tmp_Set'Access);
1042 pragma Assert (Result = 0);
1043 act.sa_mask := Tmp_Set;
1047 (Signal (Interrupt_Management.Abort_Task_Interrupt),
1048 act'Unchecked_Access,
1049 old_act'Unchecked_Access);
1050 pragma Assert (Result = 0);
1056 Result : Interfaces.C.int;
1059 -- Mask Environment task for all signals. The original mask of the
1060 -- Environment task will be recovered by Interrupt_Server task
1061 -- during the elaboration of s-interr.adb.
1063 System.Interrupt_Management.Operations.Set_Interrupt_Mask
1064 (System.Interrupt_Management.Operations.All_Tasks_Mask'Access);
1066 -- Prepare the set of signals that should unblocked in all tasks
1068 Result := sigemptyset (Unblocked_Signal_Mask'Access);
1069 pragma Assert (Result = 0);
1071 for J in Interrupt_Management.Interrupt_ID loop
1072 if System.Interrupt_Management.Keep_Unmasked (J) then
1073 Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
1074 pragma Assert (Result = 0);
1078 Result := pthread_mutexattr_init (Mutex_Attr'Access);
1079 pragma Assert (Result = 0);
1081 Result := pthread_condattr_init (Cond_Attr'Access);
1082 pragma Assert (Result = 0);
1084 end System.Task_Primitives.Operations;