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) 1992-2005, 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
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.
47 with System.Parameters;
50 with System.Tasking.Debug;
51 -- used for Known_Tasks
53 with System.Interrupt_Management;
54 -- used for Keep_Unmasked
55 -- Abort_Task_Interrupt
58 with System.OS_Primitives;
59 -- used for Delay_Modes
61 with System.Soft_Links;
62 -- used for Abort_Defer/Undefer
65 -- used for Raise_Exception
66 -- Raise_From_Signal_Handler
69 with Unchecked_Conversion;
70 with Unchecked_Deallocation;
72 package body System.Task_Primitives.Operations is
74 use System.Tasking.Debug;
77 use System.OS_Interface;
78 use System.Parameters;
79 use System.OS_Primitives;
85 -- The followings are logically constants, but need to be initialized
88 Single_RTS_Lock : aliased RTS_Lock;
89 -- This is a lock to allow only one thread of control in the RTS at
90 -- a time; it is used to execute in mutual exclusion from all other tasks.
91 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
93 ATCB_Key : aliased pthread_key_t;
94 -- Key used to find the Ada Task_Id associated with a thread
96 Environment_Task_Id : Task_Id;
97 -- A variable to hold Task_Id for the environment task
99 Unblocked_Signal_Mask : aliased sigset_t;
100 -- The set of signals that should be unblocked in all tasks
102 -- The followings are internal configuration constants needed
104 Next_Serial_Number : Task_Serial_Number := 100;
105 -- We start at 100, to reserve some special values for
106 -- using in error checking.
108 Time_Slice_Val : Integer;
109 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
111 Dispatching_Policy : Character;
112 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
114 -- The following are effectively constants, but they need to
115 -- be initialized by calling a pthread_ function.
117 Mutex_Attr : aliased pthread_mutexattr_t;
118 Cond_Attr : aliased pthread_condattr_t;
120 Foreign_Task_Elaborated : aliased Boolean := True;
121 -- Used to identified fake tasks (i.e., non-Ada Threads)
129 procedure Initialize (Environment_Task : Task_Id);
130 pragma Inline (Initialize);
131 -- Initialize various data needed by this package
133 function Is_Valid_Task return Boolean;
134 pragma Inline (Is_Valid_Task);
135 -- Does executing thread have a TCB?
137 procedure Set (Self_Id : Task_Id);
139 -- Set the self id for the current task
141 function Self return Task_Id;
142 pragma Inline (Self);
143 -- Return a pointer to the Ada Task Control Block of the calling task.
147 package body Specific is separate;
148 -- The body of this package is target specific
150 ---------------------------------
151 -- Support for foreign threads --
152 ---------------------------------
154 function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
155 -- Allocate and Initialize a new ATCB for the current Thread
157 function Register_Foreign_Thread
158 (Thread : Thread_Id) return Task_Id is separate;
160 -----------------------
161 -- Local Subprograms --
162 -----------------------
164 subtype unsigned_long is Interfaces.C.unsigned_long;
166 procedure Abort_Handler (signo : Signal);
168 function To_pthread_t is new Unchecked_Conversion
169 (unsigned_long, System.OS_Interface.pthread_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
195 Result := pthread_sigmask (SIG_UNBLOCK,
196 Unblocked_Signal_Mask'Unchecked_Access, Old_Set'Unchecked_Access);
197 pragma Assert (Result = 0);
199 raise Standard'Abort_Signal;
207 procedure Lock_RTS is
209 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
216 procedure Unlock_RTS is
218 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
225 -- The underlying thread system extends the memory (up to 2MB) when needed
227 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
228 pragma Unreferenced (T);
229 pragma Unreferenced (On);
238 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
240 return T.Common.LL.Thread;
247 function Self return Task_Id renames Specific.Self;
249 ---------------------
250 -- Initialize_Lock --
251 ---------------------
253 -- Note: mutexes and cond_variables needed per-task basis are
254 -- initialized in Initialize_TCB and the Storage_Error is
255 -- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
256 -- used in RTS is initialized before any status change of RTS.
257 -- Therefore rasing Storage_Error in the following routines
258 -- should be able to be handled safely.
260 procedure Initialize_Lock
261 (Prio : System.Any_Priority;
264 pragma Unreferenced (Prio);
266 Result : Interfaces.C.int;
268 Result := pthread_mutex_init (L, Mutex_Attr'Access);
270 pragma Assert (Result = 0 or else Result = ENOMEM);
272 if Result = ENOMEM then
273 Ada.Exceptions.Raise_Exception (Storage_Error'Identity,
274 "Failed to allocate a lock");
278 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
279 pragma Unreferenced (Level);
281 Result : Interfaces.C.int;
284 Result := pthread_mutex_init (L, Mutex_Attr'Access);
286 pragma Assert (Result = 0 or else Result = ENOMEM);
288 if Result = ENOMEM then
297 procedure Finalize_Lock (L : access Lock) is
298 Result : Interfaces.C.int;
300 Result := pthread_mutex_destroy (L);
301 pragma Assert (Result = 0);
304 procedure Finalize_Lock (L : access RTS_Lock) is
305 Result : Interfaces.C.int;
307 Result := pthread_mutex_destroy (L);
308 pragma Assert (Result = 0);
315 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
316 Result : Interfaces.C.int;
318 Result := pthread_mutex_lock (L);
319 Ceiling_Violation := Result = EINVAL;
321 -- Assume the cause of EINVAL is a priority ceiling violation
323 pragma Assert (Result = 0 or else Result = EINVAL);
327 (L : access RTS_Lock;
328 Global_Lock : Boolean := False)
330 Result : Interfaces.C.int;
332 if not Single_Lock or else Global_Lock then
333 Result := pthread_mutex_lock (L);
334 pragma Assert (Result = 0);
338 procedure Write_Lock (T : Task_Id) is
339 Result : Interfaces.C.int;
341 if not Single_Lock then
342 Result := pthread_mutex_lock (T.Common.LL.L'Access);
343 pragma Assert (Result = 0);
351 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
353 Write_Lock (L, Ceiling_Violation);
360 procedure Unlock (L : access Lock) is
361 Result : Interfaces.C.int;
363 Result := pthread_mutex_unlock (L);
364 pragma Assert (Result = 0);
367 procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
368 Result : Interfaces.C.int;
370 if not Single_Lock or else Global_Lock then
371 Result := pthread_mutex_unlock (L);
372 pragma Assert (Result = 0);
376 procedure Unlock (T : Task_Id) is
377 Result : Interfaces.C.int;
379 if not Single_Lock then
380 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
381 pragma Assert (Result = 0);
391 Reason : System.Tasking.Task_States)
393 pragma Unreferenced (Reason);
395 Result : Interfaces.C.int;
398 pragma Assert (Self_ID = Self);
401 Result := pthread_cond_wait
402 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
404 Result := pthread_cond_wait
405 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
408 -- EINTR is not considered a failure
410 pragma Assert (Result = 0 or else Result = EINTR);
417 -- This is for use within the run-time system, so abort is
418 -- assumed to be already deferred, and the caller should be
419 -- holding its own ATCB lock.
421 procedure Timed_Sleep
424 Mode : ST.Delay_Modes;
425 Reason : System.Tasking.Task_States;
426 Timedout : out Boolean;
427 Yielded : out Boolean)
429 pragma Unreferenced (Reason);
431 Check_Time : constant Duration := Monotonic_Clock;
433 Request : aliased timespec;
434 Result : Interfaces.C.int;
440 if Mode = Relative then
441 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
443 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
446 if Abs_Time > Check_Time then
447 Request := To_Timespec (Abs_Time);
450 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
451 or else Self_ID.Pending_Priority_Change;
454 Result := pthread_cond_timedwait
455 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access,
459 Result := pthread_cond_timedwait
460 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
464 exit when Abs_Time <= Monotonic_Clock;
466 if Result = 0 or Result = EINTR then
467 -- somebody may have called Wakeup for us
472 pragma Assert (Result = ETIMEDOUT);
481 -- This is for use in implementing delay statements, so
482 -- we assume the caller is abort-deferred but is holding
485 procedure Timed_Delay
488 Mode : ST.Delay_Modes)
490 Check_Time : constant Duration := Monotonic_Clock;
492 Request : aliased timespec;
493 Result : Interfaces.C.int;
500 Write_Lock (Self_ID);
502 if Mode = Relative then
503 Abs_Time := Time + Check_Time;
505 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
508 if Abs_Time > Check_Time then
509 Request := To_Timespec (Abs_Time);
510 Self_ID.Common.State := Delay_Sleep;
513 if Self_ID.Pending_Priority_Change then
514 Self_ID.Pending_Priority_Change := False;
515 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
516 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
519 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
522 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
523 Single_RTS_Lock'Access, Request'Access);
525 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
526 Self_ID.Common.LL.L'Access, Request'Access);
529 exit when Abs_Time <= Monotonic_Clock;
531 pragma Assert (Result = 0 or else
532 Result = ETIMEDOUT or else
536 Self_ID.Common.State := Runnable;
545 Result := sched_yield;
548 ---------------------
549 -- Monotonic_Clock --
550 ---------------------
552 function Monotonic_Clock return Duration is
553 TV : aliased struct_timeval;
554 Result : Interfaces.C.int;
556 Result := gettimeofday (TV'Access, System.Null_Address);
557 pragma Assert (Result = 0);
558 return To_Duration (TV);
565 function RT_Resolution return Duration is
574 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
575 pragma Unreferenced (Reason);
576 Result : Interfaces.C.int;
578 Result := pthread_cond_signal (T.Common.LL.CV'Access);
579 pragma Assert (Result = 0);
586 procedure Yield (Do_Yield : Boolean := True) is
587 Result : Interfaces.C.int;
588 pragma Unreferenced (Result);
591 Result := sched_yield;
599 procedure Set_Priority
601 Prio : System.Any_Priority;
602 Loss_Of_Inheritance : Boolean := False)
604 pragma Unreferenced (Loss_Of_Inheritance);
606 Result : Interfaces.C.int;
607 Param : aliased struct_sched_param;
610 T.Common.Current_Priority := Prio;
612 -- Priorities are in range 1 .. 99 on GNU/Linux, so we map
613 -- map 0 .. 31 to 1 .. 32
615 Param.sched_priority := Interfaces.C.int (Prio) + 1;
617 if Time_Slice_Val > 0 then
618 Result := pthread_setschedparam
619 (T.Common.LL.Thread, SCHED_RR, Param'Access);
621 elsif Dispatching_Policy = 'F' or else Time_Slice_Val = 0 then
622 Result := pthread_setschedparam
623 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
626 Param.sched_priority := 0;
627 Result := pthread_setschedparam
628 (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
631 pragma Assert (Result = 0 or else Result = EPERM);
638 function Get_Priority (T : Task_Id) return System.Any_Priority is
640 return T.Common.Current_Priority;
647 procedure Enter_Task (Self_ID : Task_Id) is
649 Self_ID.Common.LL.Thread := pthread_self;
651 Specific.Set (Self_ID);
655 for J in Known_Tasks'Range loop
656 if Known_Tasks (J) = null then
657 Known_Tasks (J) := Self_ID;
658 Self_ID.Known_Tasks_Index := J;
670 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
672 return new Ada_Task_Control_Block (Entry_Num);
679 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
681 -----------------------------
682 -- Register_Foreign_Thread --
683 -----------------------------
685 function Register_Foreign_Thread return Task_Id is
687 if Is_Valid_Task then
690 return Register_Foreign_Thread (pthread_self);
692 end Register_Foreign_Thread;
698 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
699 Result : Interfaces.C.int;
702 -- Give the task a unique serial number
704 Self_ID.Serial_Number := Next_Serial_Number;
705 Next_Serial_Number := Next_Serial_Number + 1;
706 pragma Assert (Next_Serial_Number /= 0);
708 Self_ID.Common.LL.Thread := To_pthread_t (-1);
710 if not Single_Lock then
711 Result := pthread_mutex_init (Self_ID.Common.LL.L'Access,
713 pragma Assert (Result = 0 or else Result = ENOMEM);
721 Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
723 pragma Assert (Result = 0 or else Result = ENOMEM);
728 if not Single_Lock then
729 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
730 pragma Assert (Result = 0);
741 procedure Create_Task
743 Wrapper : System.Address;
744 Stack_Size : System.Parameters.Size_Type;
745 Priority : System.Any_Priority;
746 Succeeded : out Boolean)
748 Adjusted_Stack_Size : Interfaces.C.size_t;
750 Attributes : aliased pthread_attr_t;
751 Result : Interfaces.C.int;
754 if Stack_Size = Unspecified_Size then
755 Adjusted_Stack_Size := Interfaces.C.size_t (Default_Stack_Size);
757 elsif Stack_Size < Minimum_Stack_Size then
758 Adjusted_Stack_Size := Interfaces.C.size_t (Minimum_Stack_Size);
761 Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
764 Result := pthread_attr_init (Attributes'Access);
765 pragma Assert (Result = 0 or else Result = ENOMEM);
773 pthread_attr_setstacksize
774 (Attributes'Access, Adjusted_Stack_Size);
775 pragma Assert (Result = 0);
778 pthread_attr_setdetachstate
779 (Attributes'Access, PTHREAD_CREATE_DETACHED);
780 pragma Assert (Result = 0);
782 -- Since the initial signal mask of a thread is inherited from the
783 -- creator, and the Environment task has all its signals masked, we
784 -- do not need to manipulate caller's signal mask at this point.
785 -- All tasks in RTS will have All_Tasks_Mask initially.
787 Result := pthread_create
788 (T.Common.LL.Thread'Access,
790 Thread_Body_Access (Wrapper),
792 pragma Assert (Result = 0 or else Result = EAGAIN);
794 Succeeded := Result = 0;
796 Result := pthread_attr_destroy (Attributes'Access);
797 pragma Assert (Result = 0);
799 Set_Priority (T, Priority);
806 procedure Finalize_TCB (T : Task_Id) is
807 Result : Interfaces.C.int;
809 Is_Self : constant Boolean := T = Self;
811 procedure Free is new
812 Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
815 if not Single_Lock then
816 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
817 pragma Assert (Result = 0);
820 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
821 pragma Assert (Result = 0);
823 if T.Known_Tasks_Index /= -1 then
824 Known_Tasks (T.Known_Tasks_Index) := null;
838 procedure Exit_Task is
847 procedure Abort_Task (T : Task_Id) is
848 Result : Interfaces.C.int;
850 Result := pthread_kill (T.Common.LL.Thread,
851 Signal (System.Interrupt_Management.Abort_Task_Interrupt));
852 pragma Assert (Result = 0);
859 procedure Initialize (S : in out Suspension_Object) is
860 Result : Interfaces.C.int;
862 -- Initialize internal state. It is always initialized to False (ARM
868 -- Initialize internal mutex
870 Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access);
872 pragma Assert (Result = 0 or else Result = ENOMEM);
874 if Result = ENOMEM then
878 -- Initialize internal condition variable
880 Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access);
882 pragma Assert (Result = 0 or else Result = ENOMEM);
885 Result := pthread_mutex_destroy (S.L'Access);
886 pragma Assert (Result = 0);
888 if Result = ENOMEM then
898 procedure Finalize (S : in out Suspension_Object) is
899 Result : Interfaces.C.int;
901 -- Destroy internal mutex
903 Result := pthread_mutex_destroy (S.L'Access);
904 pragma Assert (Result = 0);
906 -- Destroy internal condition variable
908 Result := pthread_cond_destroy (S.CV'Access);
909 pragma Assert (Result = 0);
916 function Current_State (S : Suspension_Object) return Boolean is
918 -- We do not want to use lock on this read operation. State is marked
919 -- as Atomic so that we ensure that the value retrieved is correct.
928 procedure Set_False (S : in out Suspension_Object) is
929 Result : Interfaces.C.int;
931 Result := pthread_mutex_lock (S.L'Access);
932 pragma Assert (Result = 0);
936 Result := pthread_mutex_unlock (S.L'Access);
937 pragma Assert (Result = 0);
944 procedure Set_True (S : in out Suspension_Object) is
945 Result : Interfaces.C.int;
947 Result := pthread_mutex_lock (S.L'Access);
948 pragma Assert (Result = 0);
950 -- If there is already a task waiting on this suspension object then
951 -- we resume it, leaving the state of the suspension object to False,
952 -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves
953 -- the state to True.
959 Result := pthread_cond_signal (S.CV'Access);
960 pragma Assert (Result = 0);
965 Result := pthread_mutex_unlock (S.L'Access);
966 pragma Assert (Result = 0);
969 ------------------------
970 -- Suspend_Until_True --
971 ------------------------
973 procedure Suspend_Until_True (S : in out Suspension_Object) is
974 Result : Interfaces.C.int;
976 Result := pthread_mutex_lock (S.L'Access);
977 pragma Assert (Result = 0);
980 -- Program_Error must be raised upon calling Suspend_Until_True
981 -- if another task is already waiting on that suspension object
982 -- (ARM D.10 par. 10).
984 Result := pthread_mutex_unlock (S.L'Access);
985 pragma Assert (Result = 0);
989 -- Suspend the task if the state is False. Otherwise, the task
990 -- continues its execution, and the state of the suspension object
991 -- is set to False (ARM D.10 par. 9).
997 Result := pthread_cond_wait (S.CV'Access, S.L'Access);
1001 Result := pthread_mutex_unlock (S.L'Access);
1002 pragma Assert (Result = 0);
1003 end Suspend_Until_True;
1011 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
1012 pragma Unreferenced (Self_ID);
1017 --------------------
1018 -- Check_No_Locks --
1019 --------------------
1021 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
1022 pragma Unreferenced (Self_ID);
1027 ----------------------
1028 -- Environment_Task --
1029 ----------------------
1031 function Environment_Task return Task_Id is
1033 return Environment_Task_Id;
1034 end Environment_Task;
1040 function Suspend_Task
1042 Thread_Self : Thread_Id) return Boolean
1045 if T.Common.LL.Thread /= Thread_Self then
1046 return pthread_kill (T.Common.LL.Thread, SIGSTOP) = 0;
1056 function Resume_Task
1058 Thread_Self : Thread_Id) return Boolean
1061 if T.Common.LL.Thread /= Thread_Self then
1062 return pthread_kill (T.Common.LL.Thread, SIGCONT) = 0;
1072 procedure Initialize (Environment_Task : Task_Id) is
1073 act : aliased struct_sigaction;
1074 old_act : aliased struct_sigaction;
1075 Tmp_Set : aliased sigset_t;
1076 Result : Interfaces.C.int;
1079 (Int : System.Interrupt_Management.Interrupt_ID) return Character;
1080 pragma Import (C, State, "__gnat_get_interrupt_state");
1081 -- Get interrupt state. Defined in a-init.c
1082 -- The input argument is the interrupt number,
1083 -- and the result is one of the following:
1085 Default : constant Character := 's';
1086 -- 'n' this interrupt not set by any Interrupt_State pragma
1087 -- 'u' Interrupt_State pragma set state to User
1088 -- 'r' Interrupt_State pragma set state to Runtime
1089 -- 's' Interrupt_State pragma set state to System (use "default"
1093 Environment_Task_Id := Environment_Task;
1095 Interrupt_Management.Initialize;
1097 -- Prepare the set of signals that should be unblocked in all tasks
1099 Result := sigemptyset (Unblocked_Signal_Mask'Access);
1100 pragma Assert (Result = 0);
1102 for J in Interrupt_Management.Interrupt_ID loop
1103 if System.Interrupt_Management.Keep_Unmasked (J) then
1104 Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
1105 pragma Assert (Result = 0);
1109 Result := pthread_mutexattr_init (Mutex_Attr'Access);
1110 pragma Assert (Result = 0);
1112 Result := pthread_condattr_init (Cond_Attr'Access);
1113 pragma Assert (Result = 0);
1115 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1117 -- Initialize the global RTS lock
1119 Specific.Initialize (Environment_Task);
1121 Enter_Task (Environment_Task);
1123 -- Install the abort-signal handler
1125 if State (System.Interrupt_Management.Abort_Task_Interrupt)
1129 act.sa_handler := Abort_Handler'Address;
1131 Result := sigemptyset (Tmp_Set'Access);
1132 pragma Assert (Result = 0);
1133 act.sa_mask := Tmp_Set;
1137 (Signal (Interrupt_Management.Abort_Task_Interrupt),
1138 act'Unchecked_Access,
1139 old_act'Unchecked_Access);
1140 pragma Assert (Result = 0);
1144 end System.Task_Primitives.Operations;