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 --
11 -- Copyright (C) 1991-2001 Florida State University --
13 -- GNARL is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNARL; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNARL was developed by the GNARL team at Florida State University. It is --
32 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
33 -- State University (http://www.gnat.com). --
35 ------------------------------------------------------------------------------
37 -- This is the VxWorks version of this package
39 -- This package contains all the GNULL primitives that interface directly
40 -- with the underlying OS.
43 -- Turn off polling, we do not want ATC polling to take place during
44 -- tasking operations. It causes infinite loops and other problems.
46 with System.Tasking.Debug;
47 -- used for Known_Tasks
53 with System.Interrupt_Management;
54 -- used for Keep_Unmasked
55 -- Abort_Task_Interrupt
57 -- Initialize_Interrupts
59 with System.Soft_Links;
60 -- used for Defer/Undefer_Abort
62 -- Note that we do not use System.Tasking.Initialization directly since
63 -- this is a higher level package that we shouldn't depend on. For example
64 -- when using the restricted run time, it is replaced by
65 -- System.Tasking.Restricted.Initialization
67 with System.OS_Interface;
68 -- used for various type, constant, and operations
70 with System.Parameters;
74 -- used for Ada_Task_Control_Block
76 -- ATCB components and types
78 with System.Task_Info;
79 -- used for Task_Image
81 with System.OS_Primitives;
82 -- used for Delay_Modes
87 with Unchecked_Conversion;
88 with Unchecked_Deallocation;
90 package body System.Task_Primitives.Operations is
92 use System.Tasking.Debug;
96 use System.OS_Interface;
97 use System.Parameters;
98 use System.OS_Primitives;
100 package SSL renames System.Soft_Links;
106 -- The followings are logically constants, but need to be initialized
109 ATCB_Key : aliased pthread_key_t;
110 -- Key used to find the Ada Task_ID associated with a VxWorks task.
112 All_Tasks_L : aliased System.Task_Primitives.RTS_Lock;
113 -- See comments on locking rules in System.Tasking (spec).
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 Time_Slice_Val : Integer;
124 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
126 Locking_Policy : Character;
127 pragma Import (C, Locking_Policy, "__gl_locking_policy");
129 Dispatching_Policy : Character;
130 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
132 FIFO_Within_Priorities : constant Boolean := Dispatching_Policy = 'F';
133 -- Indicates whether FIFO_Within_Priorities is set.
135 Mutex_Protocol : Interfaces.C.int;
137 Stack_Limit : aliased System.Address;
138 pragma Import (C, Stack_Limit, "__gnat_stack_limit");
140 -----------------------
141 -- Local Subprograms --
142 -----------------------
144 procedure Abort_Handler (signo : Signal);
146 function To_Task_ID is new Unchecked_Conversion (System.Address, Task_ID);
148 function To_Address is new Unchecked_Conversion (Task_ID, System.Address);
154 procedure Abort_Handler (signo : Signal) is
155 Self_ID : constant Task_ID := Self;
156 Result : Interfaces.C.int;
157 Old_Set : aliased sigset_t;
160 if Self_ID.Deferral_Level = 0
161 and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level and then
164 Self_ID.Aborting := True;
166 -- Make sure signals used for RTS internal purpose are unmasked
168 Result := pthread_sigmask (SIG_UNBLOCK,
169 Unblocked_Signal_Mask'Unchecked_Access, Old_Set'Unchecked_Access);
170 pragma Assert (Result = 0);
172 raise Standard'Abort_Signal;
180 procedure Stack_Guard (T : ST.Task_ID; On : Boolean) is
181 Task_Descriptor : aliased System.VxWorks.TASK_DESC;
182 Result : Interfaces.C.int;
186 Result := taskInfoGet (T.Common.LL.Thread,
187 Task_Descriptor'Unchecked_Access);
188 pragma Assert (Result = 0);
190 Stack_Limit := Task_Descriptor.td_pStackLimit;
198 function Get_Thread_Id (T : ST.Task_ID) return OSI.Thread_Id is
200 return T.Common.LL.Thread;
207 function Self return Task_ID is
208 Result : System.Address;
211 Result := pthread_getspecific (ATCB_Key);
212 pragma Assert (Result /= System.Null_Address);
213 return To_Task_ID (Result);
216 -----------------------------
217 -- Install_Signal_Handlers --
218 -----------------------------
220 procedure Install_Signal_Handlers;
221 pragma Inline (Install_Signal_Handlers);
223 procedure Install_Signal_Handlers is
224 act : aliased struct_sigaction;
225 old_act : aliased struct_sigaction;
226 Tmp_Set : aliased sigset_t;
227 Result : Interfaces.C.int;
231 act.sa_handler := Abort_Handler'Address;
233 Result := sigemptyset (Tmp_Set'Access);
234 pragma Assert (Result = 0);
235 act.sa_mask := Tmp_Set;
239 (Signal (Interrupt_Management.Abort_Task_Interrupt),
240 act'Unchecked_Access,
241 old_act'Unchecked_Access);
242 pragma Assert (Result = 0);
244 Interrupt_Management.Initialize_Interrupts;
245 end Install_Signal_Handlers;
247 ---------------------
248 -- Initialize_Lock --
249 ---------------------
251 -- Note: mutexes and cond_variables needed per-task basis are
252 -- initialized in Initialize_TCB and the Storage_Error is
253 -- handled. Other mutexes (such as All_Tasks_Lock, Memory_Lock...)
254 -- used in RTS is initialized before any status change of RTS.
255 -- Therefore rasing Storage_Error in the following routines
256 -- should be able to be handled safely.
258 procedure Initialize_Lock
259 (Prio : System.Any_Priority;
262 Attributes : aliased pthread_mutexattr_t;
263 Result : Interfaces.C.int;
265 Result := pthread_mutexattr_init (Attributes'Access);
266 pragma Assert (Result = 0 or else Result = ENOMEM);
268 if Result = ENOMEM then
272 Result := pthread_mutexattr_setprotocol
273 (Attributes'Access, Mutex_Protocol);
274 pragma Assert (Result = 0);
276 Result := pthread_mutexattr_setprioceiling
277 (Attributes'Access, Interfaces.C.int (Prio));
278 pragma Assert (Result = 0);
280 Result := pthread_mutex_init (L, Attributes'Access);
281 pragma Assert (Result = 0 or else Result = ENOMEM);
283 if Result = ENOMEM then
287 Result := pthread_mutexattr_destroy (Attributes'Access);
288 pragma Assert (Result = 0);
291 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
292 Attributes : aliased pthread_mutexattr_t;
293 Result : Interfaces.C.int;
296 Result := pthread_mutexattr_init (Attributes'Access);
297 pragma Assert (Result = 0 or else Result = ENOMEM);
299 if Result = ENOMEM then
303 Result := pthread_mutexattr_setprotocol
304 (Attributes'Access, Mutex_Protocol);
305 pragma Assert (Result = 0);
307 Result := pthread_mutexattr_setprioceiling
309 Interfaces.C.int (System.Any_Priority'Last));
310 pragma Assert (Result = 0);
312 Result := pthread_mutex_init (L, Attributes'Access);
313 pragma Assert (Result = 0 or else Result = ENOMEM);
315 if Result = ENOMEM then
319 Result := pthread_mutexattr_destroy (Attributes'Access);
320 pragma Assert (Result = 0);
327 procedure Finalize_Lock (L : access Lock) is
328 Result : Interfaces.C.int;
331 Result := pthread_mutex_destroy (L);
332 pragma Assert (Result = 0);
335 procedure Finalize_Lock (L : access RTS_Lock) is
336 Result : Interfaces.C.int;
339 Result := pthread_mutex_destroy (L);
340 pragma Assert (Result = 0);
347 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
348 Result : Interfaces.C.int;
351 Result := pthread_mutex_lock (L);
353 -- Assume that the cause of EINVAL is a priority ceiling violation
355 Ceiling_Violation := (Result = EINVAL);
356 pragma Assert (Result = 0 or else Result = EINVAL);
359 procedure Write_Lock (L : access RTS_Lock) is
360 Result : Interfaces.C.int;
363 Result := pthread_mutex_lock (L);
364 pragma Assert (Result = 0);
367 procedure Write_Lock (T : Task_ID) is
368 Result : Interfaces.C.int;
371 Result := pthread_mutex_lock (T.Common.LL.L'Access);
372 pragma Assert (Result = 0);
379 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
381 Write_Lock (L, Ceiling_Violation);
388 procedure Unlock (L : access Lock) is
389 Result : Interfaces.C.int;
392 Result := pthread_mutex_unlock (L);
393 pragma Assert (Result = 0);
396 procedure Unlock (L : access RTS_Lock) is
397 Result : Interfaces.C.int;
400 Result := pthread_mutex_unlock (L);
401 pragma Assert (Result = 0);
404 procedure Unlock (T : Task_ID) is
405 Result : Interfaces.C.int;
408 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
409 pragma Assert (Result = 0);
416 procedure Sleep (Self_ID : Task_ID;
417 Reason : System.Tasking.Task_States) is
418 Result : Interfaces.C.int;
421 pragma Assert (Self_ID = Self);
422 Result := pthread_cond_wait (Self_ID.Common.LL.CV'Access,
423 Self_ID.Common.LL.L'Access);
425 -- EINTR is not considered a failure.
427 pragma Assert (Result = 0 or else Result = EINTR);
434 -- This is for use within the run-time system, so abort is
435 -- assumed to be already deferred, and the caller should be
436 -- holding its own ATCB lock.
438 procedure Timed_Sleep
441 Mode : ST.Delay_Modes;
442 Reason : System.Tasking.Task_States;
443 Timedout : out Boolean;
444 Yielded : out Boolean)
446 Check_Time : constant Duration := Monotonic_Clock;
448 Request : aliased timespec;
449 Result : Interfaces.C.int;
455 if Mode = Relative then
456 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
458 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
461 if Abs_Time > Check_Time then
462 Request := To_Timespec (Abs_Time);
464 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
465 or else Self_ID.Pending_Priority_Change;
467 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
468 Self_ID.Common.LL.L'Access, Request'Access);
470 exit when Abs_Time <= Monotonic_Clock;
472 if Result = 0 or Result = EINTR then
474 -- Somebody may have called Wakeup for us
480 pragma Assert (Result = ETIMEDOUT);
489 -- This is for use in implementing delay statements, so
490 -- we assume the caller is abort-deferred but is holding
493 procedure Timed_Delay
496 Mode : ST.Delay_Modes)
498 Check_Time : constant Duration := Monotonic_Clock;
500 Request : aliased timespec;
501 Result : Interfaces.C.int;
502 Yielded : Boolean := False;
505 -- Only the little window between deferring abort and
506 -- locking Self_ID is the reason we need to
507 -- check for pending abort and priority change below! :(
510 Write_Lock (Self_ID);
512 if Mode = Relative then
513 Abs_Time := Time + Check_Time;
515 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
518 if Abs_Time > Check_Time then
519 Request := To_Timespec (Abs_Time);
520 Self_ID.Common.State := Delay_Sleep;
523 if Self_ID.Pending_Priority_Change then
524 Self_ID.Pending_Priority_Change := False;
525 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
526 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
529 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
531 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
532 Self_ID.Common.LL.L'Access, Request'Access);
534 exit when Abs_Time <= Monotonic_Clock;
536 pragma Assert (Result = 0
537 or else Result = ETIMEDOUT
538 or else Result = EINTR);
541 Self_ID.Common.State := Runnable;
547 Result := sched_yield;
549 SSL.Abort_Undefer.all;
552 ---------------------
553 -- Monotonic_Clock --
554 ---------------------
556 function Monotonic_Clock return Duration is
557 TS : aliased timespec;
558 Result : Interfaces.C.int;
560 Result := clock_gettime (CLOCK_REALTIME, TS'Unchecked_Access);
561 pragma Assert (Result = 0);
562 return To_Duration (TS);
569 function RT_Resolution return Duration is
578 procedure Wakeup (T : Task_ID; Reason : System.Tasking.Task_States) is
579 Result : Interfaces.C.int;
582 Result := pthread_cond_signal (T.Common.LL.CV'Access);
583 pragma Assert (Result = 0);
590 procedure Yield (Do_Yield : Boolean := True) is
591 Result : Interfaces.C.int;
594 Result := sched_yield;
601 type Prio_Array_Type is array (System.Any_Priority) of Integer;
602 pragma Atomic_Components (Prio_Array_Type);
604 Prio_Array : Prio_Array_Type;
605 -- Global array containing the id of the currently running task for
608 -- Note: we assume that we are on a single processor with run-til-blocked
611 procedure Set_Priority
613 Prio : System.Any_Priority;
614 Loss_Of_Inheritance : Boolean := False)
616 Param : aliased struct_sched_param;
617 Array_Item : Integer;
618 Result : Interfaces.C.int;
621 Param.sched_priority := Interfaces.C.int (Prio);
623 if Time_Slice_Val <= 0 then
624 Result := pthread_setschedparam
625 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
627 Result := pthread_setschedparam
628 (T.Common.LL.Thread, SCHED_RR, Param'Access);
631 pragma Assert (Result = 0);
633 if FIFO_Within_Priorities then
635 -- Annex D requirement [RM D.2.2 par. 9]:
636 -- If the task drops its priority due to the loss of inherited
637 -- priority, it is added at the head of the ready queue for its
638 -- new active priority.
640 if Loss_Of_Inheritance
641 and then Prio < T.Common.Current_Priority
643 Array_Item := Prio_Array (T.Common.Base_Priority) + 1;
644 Prio_Array (T.Common.Base_Priority) := Array_Item;
647 -- Let some processes a chance to arrive
651 -- Then wait for our turn to proceed
653 exit when Array_Item = Prio_Array (T.Common.Base_Priority)
654 or else Prio_Array (T.Common.Base_Priority) = 1;
657 Prio_Array (T.Common.Base_Priority) :=
658 Prio_Array (T.Common.Base_Priority) - 1;
662 T.Common.Current_Priority := Prio;
669 function Get_Priority (T : Task_ID) return System.Any_Priority is
671 return T.Common.Current_Priority;
678 procedure Enter_Task (Self_ID : Task_ID) is
679 Result : Interfaces.C.int;
681 procedure Init_Float;
682 pragma Import (C, Init_Float, "__gnat_init_float");
683 -- Properly initializes the FPU for PPC/MIPS systems.
686 Self_ID.Common.LL.Thread := pthread_self;
688 Result := pthread_setspecific (ATCB_Key, To_Address (Self_ID));
689 pragma Assert (Result = 0);
693 -- Install the signal handlers.
694 -- This is called for each task since there is no signal inheritance
695 -- between VxWorks tasks.
697 Install_Signal_Handlers;
701 for T in Known_Tasks'Range loop
702 if Known_Tasks (T) = null then
703 Known_Tasks (T) := Self_ID;
704 Self_ID.Known_Tasks_Index := T;
709 Unlock_All_Tasks_List;
716 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_ID is
718 return new Ada_Task_Control_Block (Entry_Num);
721 ----------------------
723 ----------------------
725 procedure Initialize_TCB (Self_ID : Task_ID; Succeeded : out Boolean) is
726 Mutex_Attr : aliased pthread_mutexattr_t;
727 Result : Interfaces.C.int;
728 Cond_Attr : aliased pthread_condattr_t;
731 Self_ID.Common.LL.Thread := null_pthread;
733 Result := pthread_mutexattr_init (Mutex_Attr'Access);
734 pragma Assert (Result = 0 or else Result = ENOMEM);
741 Result := pthread_mutexattr_setprotocol
742 (Mutex_Attr'Access, Mutex_Protocol);
743 pragma Assert (Result = 0);
745 Result := pthread_mutexattr_setprioceiling
746 (Mutex_Attr'Access, Interfaces.C.int (System.Any_Priority'Last));
747 pragma Assert (Result = 0);
749 Result := pthread_mutex_init (Self_ID.Common.LL.L'Access,
751 pragma Assert (Result = 0 or else Result = ENOMEM);
758 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
759 pragma Assert (Result = 0);
761 Result := pthread_condattr_init (Cond_Attr'Access);
762 pragma Assert (Result = 0 or else Result = ENOMEM);
765 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
766 pragma Assert (Result = 0);
771 Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
773 pragma Assert (Result = 0 or else Result = ENOMEM);
778 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
779 pragma Assert (Result = 0);
783 Result := pthread_condattr_destroy (Cond_Attr'Access);
784 pragma Assert (Result = 0);
791 procedure Create_Task
793 Wrapper : System.Address;
794 Stack_Size : System.Parameters.Size_Type;
795 Priority : System.Any_Priority;
796 Succeeded : out Boolean)
798 use type System.Task_Info.Task_Image_Type;
800 Adjusted_Stack_Size : Interfaces.C.size_t;
801 Attributes : aliased pthread_attr_t;
802 Result : Interfaces.C.int;
804 function Thread_Body_Access is new
805 Unchecked_Conversion (System.Address, Thread_Body);
808 if Stack_Size = Unspecified_Size then
809 Adjusted_Stack_Size := Interfaces.C.size_t (Default_Stack_Size);
811 elsif Stack_Size < Minimum_Stack_Size then
812 Adjusted_Stack_Size := Interfaces.C.size_t (Minimum_Stack_Size);
815 Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
818 -- Ask for 4 extra bytes of stack space so that the ATCB
819 -- pointer can be stored below the stack limit, plus extra
820 -- space for the frame of Task_Wrapper. This is so the user
821 -- gets the amount of stack requested exclusive of the needs
824 -- We also have to allocate 10 more bytes for the task name
825 -- storage and enough space for the Wind Task Control Block
826 -- which is around 0x778 bytes. VxWorks also seems to carve out
827 -- additional space, so use 2048 as a nice round number.
828 -- We might want to increment to the nearest page size in
829 -- case we ever support VxVMI.
831 -- XXX - we should come back and visit this so we can
832 -- set the task name to something appropriate.
833 Adjusted_Stack_Size := Adjusted_Stack_Size + 2048;
835 Result := pthread_attr_init (Attributes'Access);
836 pragma Assert (Result = 0 or else Result = ENOMEM);
843 Result := pthread_attr_setdetachstate
844 (Attributes'Access, PTHREAD_CREATE_DETACHED);
845 pragma Assert (Result = 0);
847 Result := pthread_attr_setstacksize
848 (Attributes'Access, Adjusted_Stack_Size);
849 pragma Assert (Result = 0);
851 -- Let's check to see if the task has an image string and
852 -- use that as the VxWorks task name.
853 if T.Common.Task_Image /= null then
855 Task_Name : aliased constant String :=
856 T.Common.Task_Image.all & ASCII.NUL;
858 Result := pthread_attr_setname_np
859 (Attributes'Access, Task_Name'Address);
861 -- Since the initial signal mask of a thread is inherited from the
862 -- creator, and the Environment task has all its signals masked,
863 -- we do not need to manipulate caller's signal mask at this
864 -- point. All tasks in RTS will have All_Tasks_Mask initially.
865 Result := pthread_create
866 (T.Common.LL.Thread'Access,
868 Thread_Body_Access (Wrapper),
872 -- No specified task name
873 Result := pthread_create
874 (T.Common.LL.Thread'Access,
876 Thread_Body_Access (Wrapper),
879 pragma Assert (Result = 0);
881 Succeeded := Result = 0;
883 Result := pthread_attr_destroy (Attributes'Access);
884 pragma Assert (Result = 0);
886 Task_Creation_Hook (T.Common.LL.Thread);
888 Set_Priority (T, Priority);
895 procedure Finalize_TCB (T : Task_ID) is
896 Result : Interfaces.C.int;
899 procedure Free is new
900 Unchecked_Deallocation (Ada_Task_Control_Block, Task_ID);
903 T.Common.LL.Thread := null_pthread;
905 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
906 pragma Assert (Result = 0);
908 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
909 pragma Assert (Result = 0);
911 if T.Known_Tasks_Index /= -1 then
912 Known_Tasks (T.Known_Tasks_Index) := null;
922 procedure Exit_Task is
924 Task_Termination_Hook;
925 pthread_exit (System.Null_Address);
932 procedure Abort_Task (T : Task_ID) is
933 Result : Interfaces.C.int;
935 Result := kill (T.Common.LL.Thread,
936 Signal (Interrupt_Management.Abort_Task_Interrupt));
937 pragma Assert (Result = 0);
944 -- Dummy versions. The only currently working versions is for solaris
947 function Check_Exit (Self_ID : ST.Task_ID) return Boolean is
956 function Check_No_Locks (Self_ID : ST.Task_ID) return Boolean is
961 ----------------------
962 -- Environment_Task --
963 ----------------------
965 function Environment_Task return Task_ID is
967 return Environment_Task_ID;
968 end Environment_Task;
970 -------------------------
971 -- Lock_All_Tasks_List --
972 -------------------------
974 procedure Lock_All_Tasks_List is
976 Write_Lock (All_Tasks_L'Access);
977 end Lock_All_Tasks_List;
979 ---------------------------
980 -- Unlock_All_Tasks_List --
981 ---------------------------
983 procedure Unlock_All_Tasks_List is
985 Unlock (All_Tasks_L'Access);
986 end Unlock_All_Tasks_List;
992 function Suspend_Task
994 Thread_Self : Thread_Id) return Boolean is
996 if T.Common.LL.Thread /= null_pthread
997 and then T.Common.LL.Thread /= Thread_Self
999 return taskSuspend (T.Common.LL.Thread) = 0;
1009 function Resume_Task
1011 Thread_Self : Thread_Id) return Boolean is
1013 if T.Common.LL.Thread /= null_pthread
1014 and then T.Common.LL.Thread /= Thread_Self
1016 return taskResume (T.Common.LL.Thread) = 0;
1026 procedure Initialize (Environment_Task : Task_ID) is
1028 Environment_Task_ID := Environment_Task;
1030 -- Initialize the lock used to synchronize chain of all ATCBs.
1032 Initialize_Lock (All_Tasks_L'Access, All_Tasks_Level);
1034 Enter_Task (Environment_Task);
1039 Result : Interfaces.C.int;
1042 if Locking_Policy = 'C' then
1043 Mutex_Protocol := PTHREAD_PRIO_PROTECT;
1045 -- We default to VxWorks native priority inheritence
1046 -- and inversion safe mutexes with no ceiling checks.
1047 Mutex_Protocol := PTHREAD_PRIO_INHERIT;
1050 if Time_Slice_Val > 0 then
1051 Result := pthread_sched_rr_set_interval
1052 (Interfaces.C.int (Time_Slice_Val));
1055 -- Prepare the set of signals that should unblocked in all tasks
1057 Result := sigemptyset (Unblocked_Signal_Mask'Access);
1058 pragma Assert (Result = 0);
1060 for J in Interrupt_Management.Interrupt_ID loop
1061 if Interrupt_Management.Keep_Unmasked (J) then
1062 Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
1063 pragma Assert (Result = 0);
1067 Result := pthread_key_create (ATCB_Key'Access, null);
1068 pragma Assert (Result = 0);
1070 Result := taskVarAdd (getpid, Stack_Limit'Access);
1071 pragma Assert (Result = 0);
1073 end System.Task_Primitives.Operations;