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 a IRIX (pthread library) 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.
50 with System.Task_Info;
52 with System.Tasking.Debug;
53 -- used for Known_Tasks
58 with System.Interrupt_Management;
59 -- used for Keep_Unmasked
60 -- Abort_Task_Interrupt
63 with System.Interrupt_Management.Operations;
64 -- used for Set_Interrupt_Mask
66 pragma Elaborate_All (System.Interrupt_Management.Operations);
68 with System.Parameters;
72 -- used for Ada_Task_Control_Block
75 with System.Soft_Links;
76 -- used for Defer/Undefer_Abort
78 -- Note that we do not use System.Tasking.Initialization directly since
79 -- this is a higher level package that we shouldn't depend on. For example
80 -- when using the restricted run time, it is replaced by
81 -- System.Tasking.Restricted.Initialization
83 with System.Program_Info;
84 -- used for Default_Task_Stack
87 -- Pthread_Sched_Signal
90 with System.OS_Interface;
91 -- used for various type, constant, and operations
93 with System.OS_Primitives;
94 -- used for Delay_Modes
96 with Unchecked_Conversion;
97 with Unchecked_Deallocation;
99 package body System.Task_Primitives.Operations is
102 use System.Tasking.Debug;
104 use System.OS_Interface;
105 use System.OS_Primitives;
106 use System.Parameters;
108 package SSL renames System.Soft_Links;
114 -- The followings are logically constants, but need to be initialized
117 ATCB_Key : aliased pthread_key_t;
118 -- Key used to find the Ada Task_ID associated with a thread
120 All_Tasks_L : aliased System.Task_Primitives.RTS_Lock;
121 -- See comments on locking rules in System.Locking_Rules (spec).
123 Environment_Task_ID : Task_ID;
124 -- A variable to hold Task_ID for the environment task.
126 Locking_Policy : Character;
127 pragma Import (C, Locking_Policy, "__gl_locking_policy");
129 Real_Time_Clock_Id : constant clockid_t := CLOCK_REALTIME;
131 Unblocked_Signal_Mask : aliased sigset_t;
133 -----------------------
134 -- Local Subprograms --
135 -----------------------
137 function To_Task_ID is new Unchecked_Conversion (System.Address, Task_ID);
139 function To_Address is new Unchecked_Conversion (Task_ID, System.Address);
141 procedure Abort_Handler (Sig : Signal);
147 procedure Abort_Handler (Sig : Signal) is
149 Result : Interfaces.C.int;
150 Old_Set : aliased sigset_t;
153 if T.Deferral_Level = 0
154 and then T.Pending_ATC_Level < T.ATC_Nesting_Level
156 -- Make sure signals used for RTS internal purpose are unmasked
158 Result := pthread_sigmask
160 Unblocked_Signal_Mask'Unchecked_Access,
161 Old_Set'Unchecked_Access);
162 pragma Assert (Result = 0);
164 raise Standard'Abort_Signal;
172 -- The underlying thread system sets a guard page at the
173 -- bottom of a thread stack, so nothing is needed.
175 procedure Stack_Guard (T : ST.Task_ID; On : Boolean) is
184 function Get_Thread_Id (T : ST.Task_ID) return OSI.Thread_Id is
186 return T.Common.LL.Thread;
193 function Self return Task_ID is
194 Result : System.Address;
197 Result := pthread_getspecific (ATCB_Key);
198 pragma Assert (Result /= System.Null_Address);
200 return To_Task_ID (Result);
203 ---------------------
204 -- Initialize_Lock --
205 ---------------------
207 -- Note: mutexes and cond_variables needed per-task basis are
208 -- initialized in Intialize_TCB and the Storage_Error is
209 -- handled. Other mutexes (such as All_Tasks_Lock, Memory_Lock...)
210 -- used in RTS is initialized before any status change of RTS.
211 -- Therefore rasing Storage_Error in the following routines
212 -- should be able to be handled safely.
214 procedure Initialize_Lock
215 (Prio : System.Any_Priority;
218 Attributes : aliased pthread_mutexattr_t;
219 Result : Interfaces.C.int;
222 Result := pthread_mutexattr_init (Attributes'Access);
223 pragma Assert (Result = 0 or else Result = ENOMEM);
225 if Result = ENOMEM then
229 if Locking_Policy = 'C' then
230 Result := pthread_mutexattr_setprotocol
231 (Attributes'Access, PTHREAD_PRIO_PROTECT);
232 pragma Assert (Result = 0);
234 Result := pthread_mutexattr_setprioceiling
235 (Attributes'Access, Interfaces.C.int (Prio));
236 pragma Assert (Result = 0);
239 Result := pthread_mutex_init (L, Attributes'Access);
240 pragma Assert (Result = 0 or else Result = ENOMEM);
242 if Result = ENOMEM then
243 Result := pthread_mutexattr_destroy (Attributes'Access);
247 Result := pthread_mutexattr_destroy (Attributes'Access);
248 pragma Assert (Result = 0);
251 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
252 Attributes : aliased pthread_mutexattr_t;
253 Result : Interfaces.C.int;
256 Result := pthread_mutexattr_init (Attributes'Access);
257 pragma Assert (Result = 0 or else Result = ENOMEM);
259 if Result = ENOMEM then
263 if Locking_Policy = 'C' then
264 Result := pthread_mutexattr_setprotocol
265 (Attributes'Access, PTHREAD_PRIO_PROTECT);
266 pragma Assert (Result = 0);
268 Result := pthread_mutexattr_setprioceiling
269 (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
270 pragma Assert (Result = 0);
273 Result := pthread_mutex_init (L, Attributes'Access);
275 pragma Assert (Result = 0 or else Result = ENOMEM);
277 if Result = ENOMEM then
278 Result := pthread_mutexattr_destroy (Attributes'Access);
282 Result := pthread_mutexattr_destroy (Attributes'Access);
289 procedure Finalize_Lock (L : access Lock) is
290 Result : Interfaces.C.int;
293 Result := pthread_mutex_destroy (L);
294 pragma Assert (Result = 0);
297 procedure Finalize_Lock (L : access RTS_Lock) is
298 Result : Interfaces.C.int;
301 Result := pthread_mutex_destroy (L);
302 pragma Assert (Result = 0);
309 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
310 Result : Interfaces.C.int;
313 Result := pthread_mutex_lock (L);
314 Ceiling_Violation := Result = EINVAL;
316 -- assumes the cause of EINVAL is a priority ceiling violation
318 pragma Assert (Result = 0 or else Result = EINVAL);
321 procedure Write_Lock (L : access RTS_Lock) is
322 Result : Interfaces.C.int;
325 Result := pthread_mutex_lock (L);
326 pragma Assert (Result = 0);
329 procedure Write_Lock (T : Task_ID) is
330 Result : Interfaces.C.int;
333 Result := pthread_mutex_lock (T.Common.LL.L'Access);
334 pragma Assert (Result = 0);
341 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
343 Write_Lock (L, Ceiling_Violation);
350 procedure Unlock (L : access Lock) is
351 Result : Interfaces.C.int;
354 Result := pthread_mutex_unlock (L);
355 pragma Assert (Result = 0);
358 procedure Unlock (L : access RTS_Lock) is
359 Result : Interfaces.C.int;
362 Result := pthread_mutex_unlock (L);
363 pragma Assert (Result = 0);
366 procedure Unlock (T : Task_ID) is
367 Result : Interfaces.C.int;
370 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
371 pragma Assert (Result = 0);
379 (Self_ID : ST.Task_ID;
380 Reason : System.Tasking.Task_States)
382 Result : Interfaces.C.int;
384 pragma Assert (Self_ID = Self);
385 Result := pthread_cond_wait (Self_ID.Common.LL.CV'Access,
386 Self_ID.Common.LL.L'Access);
388 -- EINTR is not considered a failure.
390 pragma Assert (Result = 0 or else Result = EINTR);
397 procedure Timed_Sleep
400 Mode : ST.Delay_Modes;
401 Reason : Task_States;
402 Timedout : out Boolean;
403 Yielded : out Boolean)
405 Check_Time : constant Duration := Monotonic_Clock;
407 Request : aliased timespec;
408 Result : Interfaces.C.int;
414 if Mode = Relative then
415 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
417 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
420 if Abs_Time > Check_Time then
421 Request := To_Timespec (Abs_Time);
424 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
425 or else Self_ID.Pending_Priority_Change;
427 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
428 Self_ID.Common.LL.L'Access, Request'Access);
430 exit when Abs_Time <= Monotonic_Clock;
432 if Result = 0 or else errno = EINTR then
444 -- This is for use in implementing delay statements, so
445 -- we assume the caller is abort-deferred but is holding
448 procedure Timed_Delay
451 Mode : ST.Delay_Modes)
453 Check_Time : constant Duration := Monotonic_Clock;
455 Request : aliased timespec;
456 Result : Interfaces.C.int;
459 -- Only the little window between deferring abort and
460 -- locking Self_ID is the reason we need to
461 -- check for pending abort and priority change below! :(
464 Write_Lock (Self_ID);
466 if Mode = Relative then
467 Abs_Time := Time + Check_Time;
469 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
472 if Abs_Time > Check_Time then
473 Request := To_Timespec (Abs_Time);
474 Self_ID.Common.State := Delay_Sleep;
477 if Self_ID.Pending_Priority_Change then
478 Self_ID.Pending_Priority_Change := False;
479 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
480 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
483 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
485 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
486 Self_ID.Common.LL.L'Access, Request'Access);
487 exit when Abs_Time <= Monotonic_Clock;
489 pragma Assert (Result = 0
490 or else Result = ETIMEDOUT
491 or else Result = EINTR);
494 Self_ID.Common.State := Runnable;
499 SSL.Abort_Undefer.all;
502 ---------------------
503 -- Monotonic_Clock --
504 ---------------------
506 function Monotonic_Clock return Duration is
507 TS : aliased timespec;
508 Result : Interfaces.C.int;
511 Result := clock_gettime (Real_Time_Clock_Id, TS'Unchecked_Access);
512 pragma Assert (Result = 0);
513 return To_Duration (TS);
520 function RT_Resolution return Duration is
522 -- The clock_getres (Real_Time_Clock_Id) function appears to return
523 -- the interrupt resolution of the realtime clock and not the actual
524 -- resolution of reading the clock. Even though this last value is
525 -- only guaranteed to be 100 Hz, at least the Origin 200 appears to
526 -- have a microsecond resolution or better.
527 -- ??? We should figure out a method to return the right value on
530 return 0.000_001; -- Assume microsecond resolution of clock
537 procedure Wakeup (T : ST.Task_ID; Reason : System.Tasking.Task_States) is
538 Result : Interfaces.C.int;
540 Result := pthread_cond_signal (T.Common.LL.CV'Access);
541 pragma Assert (Result = 0);
548 procedure Yield (Do_Yield : Boolean := True) is
549 Result : Interfaces.C.int;
552 Result := sched_yield;
560 procedure Set_Priority
562 Prio : System.Any_Priority;
563 Loss_Of_Inheritance : Boolean := False)
565 Result : Interfaces.C.int;
566 Param : aliased struct_sched_param;
567 Sched_Policy : Interfaces.C.int;
569 use type System.Task_Info.Task_Info_Type;
571 function To_Int is new Unchecked_Conversion
572 (System.Task_Info.Thread_Scheduling_Policy, Interfaces.C.int);
575 T.Common.Current_Priority := Prio;
576 Param.sched_priority := Interfaces.C.int (Prio);
578 if T.Common.Task_Info /= null then
579 Sched_Policy := To_Int (T.Common.Task_Info.Policy);
581 Sched_Policy := SCHED_FIFO;
584 Result := pthread_setschedparam (T.Common.LL.Thread, Sched_Policy,
586 pragma Assert (Result = 0);
593 function Get_Priority (T : Task_ID) return System.Any_Priority is
595 return T.Common.Current_Priority;
602 procedure Enter_Task (Self_ID : Task_ID) is
603 Result : Interfaces.C.int;
605 function To_Int is new Unchecked_Conversion
606 (System.Task_Info.CPU_Number, Interfaces.C.int);
608 use System.Task_Info;
611 Self_ID.Common.LL.Thread := pthread_self;
612 Result := pthread_setspecific (ATCB_Key, To_Address (Self_ID));
613 pragma Assert (Result = 0);
615 if Self_ID.Common.Task_Info /= null
616 and then Self_ID.Common.Task_Info.Scope = PTHREAD_SCOPE_SYSTEM
617 and then Self_ID.Common.Task_Info.Runon_CPU /= ANY_CPU
619 Result := pthread_setrunon_np
620 (To_Int (Self_ID.Common.Task_Info.Runon_CPU));
621 pragma Assert (Result = 0);
626 for J in Known_Tasks'Range loop
627 if Known_Tasks (J) = null then
628 Known_Tasks (J) := Self_ID;
629 Self_ID.Known_Tasks_Index := J;
634 Unlock_All_Tasks_List;
641 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_ID is
643 return new Ada_Task_Control_Block (Entry_Num);
650 procedure Initialize_TCB (Self_ID : Task_ID; Succeeded : out Boolean) is
651 Result : Interfaces.C.int;
652 Cond_Attr : aliased pthread_condattr_t;
655 Initialize_Lock (Self_ID.Common.LL.L'Access, All_Tasks_Level);
657 Result := pthread_condattr_init (Cond_Attr'Access);
658 pragma Assert (Result = 0 or else Result = ENOMEM);
661 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
662 pragma Assert (Result = 0);
668 Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
670 pragma Assert (Result = 0 or else Result = ENOMEM);
675 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
676 pragma Assert (Result = 0);
680 Result := pthread_condattr_destroy (Cond_Attr'Access);
681 pragma Assert (Result = 0);
688 procedure Create_Task
690 Wrapper : System.Address;
691 Stack_Size : System.Parameters.Size_Type;
692 Priority : System.Any_Priority;
693 Succeeded : out Boolean)
695 use System.Task_Info;
697 Attributes : aliased pthread_attr_t;
698 Sched_Param : aliased struct_sched_param;
699 Adjusted_Stack_Size : Interfaces.C.size_t;
700 Result : Interfaces.C.int;
702 function Thread_Body_Access is new
703 Unchecked_Conversion (System.Address, Thread_Body);
705 function To_Int is new Unchecked_Conversion
706 (System.Task_Info.Thread_Scheduling_Scope, Interfaces.C.int);
707 function To_Int is new Unchecked_Conversion
708 (System.Task_Info.Thread_Scheduling_Inheritance, Interfaces.C.int);
709 function To_Int is new Unchecked_Conversion
710 (System.Task_Info.Thread_Scheduling_Policy, Interfaces.C.int);
713 if Stack_Size = System.Parameters.Unspecified_Size then
714 Adjusted_Stack_Size :=
715 Interfaces.C.size_t (System.Program_Info.Default_Task_Stack);
717 elsif Stack_Size < Size_Type (Minimum_Stack_Size) then
718 Adjusted_Stack_Size :=
719 Interfaces.C.size_t (Minimum_Stack_Size);
722 Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
725 Result := pthread_attr_init (Attributes'Access);
726 pragma Assert (Result = 0 or else Result = ENOMEM);
733 Result := pthread_attr_setdetachstate
734 (Attributes'Access, PTHREAD_CREATE_DETACHED);
735 pragma Assert (Result = 0);
737 Result := pthread_attr_setstacksize
738 (Attributes'Access, Interfaces.C.size_t (Adjusted_Stack_Size));
739 pragma Assert (Result = 0);
741 if T.Common.Task_Info /= null then
742 Result := pthread_attr_setscope
743 (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
744 pragma Assert (Result = 0);
746 Result := pthread_attr_setinheritsched
747 (Attributes'Access, To_Int (T.Common.Task_Info.Inheritance));
748 pragma Assert (Result = 0);
750 Result := pthread_attr_setschedpolicy
751 (Attributes'Access, To_Int (T.Common.Task_Info.Policy));
752 pragma Assert (Result = 0);
754 Sched_Param.sched_priority :=
755 Interfaces.C.int (T.Common.Task_Info.Priority);
757 Result := pthread_attr_setschedparam
758 (Attributes'Access, Sched_Param'Access);
759 pragma Assert (Result = 0);
762 -- Since the initial signal mask of a thread is inherited from the
763 -- creator, and the Environment task has all its signals masked, we
764 -- do not need to manipulate caller's signal mask at this point.
765 -- All tasks in RTS will have All_Tasks_Mask initially.
767 Result := pthread_create
768 (T.Common.LL.Thread'Access,
770 Thread_Body_Access (Wrapper),
774 and then T.Common.Task_Info /= null
775 and then T.Common.Task_Info.Scope = PTHREAD_SCOPE_SYSTEM
777 -- The pthread_create call may have failed because we
778 -- asked for a system scope pthread and none were
779 -- available (probably because the program was not executed
780 -- by the superuser). Let's try for a process scope pthread
781 -- instead of raising Tasking_Error.
784 ("Request for PTHREAD_SCOPE_SYSTEM in Task_Info pragma for task");
785 System.IO.Put ("""");
786 System.IO.Put (T.Common.Task_Image.all);
787 System.IO.Put_Line (""" could not be honored. ");
788 System.IO.Put_Line ("Scope changed to PTHREAD_SCOPE_PROCESS");
790 T.Common.Task_Info.Scope := PTHREAD_SCOPE_PROCESS;
791 Result := pthread_attr_setscope
792 (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
793 pragma Assert (Result = 0);
795 Result := pthread_create
796 (T.Common.LL.Thread'Access,
798 Thread_Body_Access (Wrapper),
802 pragma Assert (Result = 0 or else Result = EAGAIN);
804 Succeeded := Result = 0;
806 Set_Priority (T, Priority);
808 Result := pthread_attr_destroy (Attributes'Access);
809 pragma Assert (Result = 0);
816 procedure Finalize_TCB (T : Task_ID) is
817 Result : Interfaces.C.int;
820 procedure Free is new
821 Unchecked_Deallocation (Ada_Task_Control_Block, Task_ID);
824 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
825 pragma Assert (Result = 0);
827 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
828 pragma Assert (Result = 0);
830 if T.Known_Tasks_Index /= -1 then
831 Known_Tasks (T.Known_Tasks_Index) := null;
841 procedure Exit_Task is
843 pthread_exit (System.Null_Address);
850 procedure Abort_Task (T : Task_ID) is
851 Result : Interfaces.C.int;
853 Result := pthread_kill (T.Common.LL.Thread,
854 Signal (System.Interrupt_Management.Abort_Task_Interrupt));
855 pragma Assert (Result = 0);
862 -- Dummy versions. The only currently working versions is for solaris
865 function Check_Exit (Self_ID : ST.Task_ID) return Boolean is
874 function Check_No_Locks (Self_ID : ST.Task_ID) return Boolean is
879 ----------------------
880 -- Environment_Task --
881 ----------------------
883 function Environment_Task return Task_ID is
885 return Environment_Task_ID;
886 end Environment_Task;
888 -------------------------
889 -- Lock_All_Tasks_List --
890 -------------------------
892 procedure Lock_All_Tasks_List is
894 Write_Lock (All_Tasks_L'Access);
895 end Lock_All_Tasks_List;
897 ---------------------------
898 -- Unlock_All_Tasks_List --
899 ---------------------------
901 procedure Unlock_All_Tasks_List is
903 Unlock (All_Tasks_L'Access);
904 end Unlock_All_Tasks_List;
910 function Suspend_Task
912 Thread_Self : Thread_Id) return Boolean is
923 Thread_Self : Thread_Id) return Boolean is
932 procedure Initialize (Environment_Task : Task_ID) is
933 act : aliased struct_sigaction;
934 old_act : aliased struct_sigaction;
935 Tmp_Set : aliased sigset_t;
936 Result : Interfaces.C.int;
939 Environment_Task_ID := Environment_Task;
941 -- Initialize the lock used to synchronize chain of all ATCBs.
942 Initialize_Lock (All_Tasks_L'Access, All_Tasks_Level);
944 Enter_Task (Environment_Task);
946 -- Install the abort-signal handler
949 act.sa_handler := Abort_Handler'Address;
951 Result := sigemptyset (Tmp_Set'Access);
952 pragma Assert (Result = 0);
953 act.sa_mask := Tmp_Set;
957 Signal (System.Interrupt_Management.Abort_Task_Interrupt),
958 act'Unchecked_Access,
959 old_act'Unchecked_Access);
960 pragma Assert (Result = 0);
965 Result : Interfaces.C.int;
967 -- Mask Environment task for all signals. The original mask of the
968 -- Environment task will be recovered by Interrupt_Server task
969 -- during the elaboration of s-interr.adb.
971 System.Interrupt_Management.Operations.Set_Interrupt_Mask
972 (System.Interrupt_Management.Operations.All_Tasks_Mask'Access);
974 -- Prepare the set of signals that should unblocked in all tasks
976 Result := sigemptyset (Unblocked_Signal_Mask'Access);
977 pragma Assert (Result = 0);
979 for J in Interrupt_Management.Interrupt_ID loop
980 if System.Interrupt_Management.Keep_Unmasked (J) then
981 Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
982 pragma Assert (Result = 0);
986 Result := pthread_key_create (ATCB_Key'Access, null);
987 pragma Assert (Result = 0);
989 -- Pick the highest resolution Clock for Clock_Realtime
990 -- ??? This code currently doesn't work (see c94007[ab] for example)
992 -- if syssgi (SGI_CYCLECNTR_SIZE) = 64 then
993 -- Real_Time_Clock_Id := CLOCK_SGI_CYCLE;
995 -- Real_Time_Clock_Id := CLOCK_REALTIME;
998 end System.Task_Primitives.Operations;