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 OpenVMS/Alpha 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
.Parameters
;
54 -- used for Ada_Task_Control_Block
57 with System
.Soft_Links
;
58 -- used for Defer/Undefer_Abort
61 -- Note that we do not use System.Tasking.Initialization directly since
62 -- this is a higher level package that we shouldn't depend on. For example
63 -- when using the restricted run time, it is replaced by
64 -- System.Tasking.Restricted.Initialization
66 with System
.OS_Primitives
;
67 -- used for Delay_Modes
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
;
80 use type System
.OS_Primitives
.OS_Time
;
82 package SSL
renames System
.Soft_Links
;
88 -- The followings are logically constants, but need to be initialized
91 Single_RTS_Lock
: aliased RTS_Lock
;
92 -- This is a lock to allow only one thread of control in the RTS at
93 -- a time; it is used to execute in mutual exclusion from all other tasks.
94 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
96 ATCB_Key
: aliased pthread_key_t
;
97 -- Key used to find the Ada Task_ID associated with a thread
99 Environment_Task_ID
: Task_ID
;
100 -- A variable to hold Task_ID for the environment task.
102 Time_Slice_Val
: Integer;
103 pragma Import
(C
, Time_Slice_Val
, "__gl_time_slice_val");
105 Dispatching_Policy
: Character;
106 pragma Import
(C
, Dispatching_Policy
, "__gl_task_dispatching_policy");
108 FIFO_Within_Priorities
: constant Boolean := Dispatching_Policy
= 'F';
109 -- Indicates whether FIFO_Within_Priorities is set.
111 Foreign_Task_Elaborated
: aliased Boolean := True;
112 -- Used to identified fake tasks (i.e., non-Ada Threads).
120 procedure Initialize
(Environment_Task
: Task_ID
);
121 pragma Inline
(Initialize
);
122 -- Initialize various data needed by this package.
124 function Is_Valid_Task
return Boolean;
125 pragma Inline
(Is_Valid_Task
);
126 -- Does executing thread have a TCB?
128 procedure Set
(Self_Id
: Task_ID
);
130 -- Set the self id for the current task
132 function Self
return Task_ID
;
133 pragma Inline
(Self
);
134 -- Return a pointer to the Ada Task Control Block of the calling task
138 package body Specific
is separate;
139 -- The body of this package is target specific.
141 ---------------------------------
142 -- Support for foreign threads --
143 ---------------------------------
145 function Register_Foreign_Thread
(Thread
: Thread_Id
) return Task_ID
;
146 -- Allocate and Initialize a new ATCB for the current Thread
148 function Register_Foreign_Thread
149 (Thread
: Thread_Id
) return Task_ID
is separate;
151 -----------------------
152 -- Local Subprograms --
153 -----------------------
155 function To_Task_ID
is new Unchecked_Conversion
(System
.Address
, Task_ID
);
157 function To_Address
is new Unchecked_Conversion
(Task_ID
, System
.Address
);
159 procedure Timer_Sleep_AST
(ID
: Address
);
160 -- Signal the condition variable when AST fires.
162 procedure Timer_Sleep_AST
(ID
: Address
) is
163 Result
: Interfaces
.C
.int
;
164 Self_ID
: constant Task_ID
:= To_Task_ID
(ID
);
166 Self_ID
.Common
.LL
.AST_Pending
:= False;
167 Result
:= pthread_cond_signal_int_np
(Self_ID
.Common
.LL
.CV
'Access);
168 pragma Assert
(Result
= 0);
175 -- The underlying thread system sets a guard page at the
176 -- bottom of a thread stack, so nothing is needed.
177 -- ??? Check the comment above
179 procedure Stack_Guard
(T
: ST
.Task_ID
; On
: Boolean) is
180 pragma Unreferenced
(T
);
181 pragma Unreferenced
(On
);
190 function Get_Thread_Id
(T
: ST
.Task_ID
) return OSI
.Thread_Id
is
192 return T
.Common
.LL
.Thread
;
199 function Self
return Task_ID
renames Specific
.Self
;
201 ---------------------
202 -- Initialize_Lock --
203 ---------------------
205 -- Note: mutexes and cond_variables needed per-task basis are
206 -- initialized in Initialize_TCB and the Storage_Error is
207 -- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
208 -- used in RTS is initialized before any status change of RTS.
209 -- Therefore rasing Storage_Error in the following routines
210 -- should be able to be handled safely.
212 procedure Initialize_Lock
(Prio
: System
.Any_Priority
; L
: access Lock
) is
213 Attributes
: aliased pthread_mutexattr_t
;
214 Result
: Interfaces
.C
.int
;
217 Result
:= pthread_mutexattr_init
(Attributes
'Access);
218 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
220 if Result
= ENOMEM
then
225 L
.Prio
:= Interfaces
.C
.int
(Prio
);
227 Result
:= pthread_mutex_init
(L
.L
'Access, Attributes
'Access);
228 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
230 if Result
= ENOMEM
then
234 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
235 pragma Assert
(Result
= 0);
238 procedure Initialize_Lock
(L
: access RTS_Lock
; Level
: Lock_Level
) is
239 pragma Unreferenced
(Level
);
241 Attributes
: aliased pthread_mutexattr_t
;
242 Result
: Interfaces
.C
.int
;
245 Result
:= pthread_mutexattr_init
(Attributes
'Access);
246 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
248 if Result
= ENOMEM
then
252 -- Don't use, see comment in s-osinte.ads about ERRORCHECK mutexes???
253 -- Result := pthread_mutexattr_settype_np
254 -- (Attributes'Access, PTHREAD_MUTEX_ERRORCHECK_NP);
255 -- pragma Assert (Result = 0);
257 -- Result := pthread_mutexattr_setprotocol
258 -- (Attributes'Access, PTHREAD_PRIO_PROTECT);
259 -- pragma Assert (Result = 0);
261 -- Result := pthread_mutexattr_setprioceiling
262 -- (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
263 -- pragma Assert (Result = 0);
265 Result
:= pthread_mutex_init
(L
, Attributes
'Access);
267 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
269 if Result
= ENOMEM
then
273 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
274 pragma Assert
(Result
= 0);
281 procedure Finalize_Lock
(L
: access Lock
) is
282 Result
: Interfaces
.C
.int
;
284 Result
:= pthread_mutex_destroy
(L
.L
'Access);
285 pragma Assert
(Result
= 0);
288 procedure Finalize_Lock
(L
: access RTS_Lock
) is
289 Result
: Interfaces
.C
.int
;
291 Result
:= pthread_mutex_destroy
(L
);
292 pragma Assert
(Result
= 0);
299 procedure Write_Lock
(L
: access Lock
; Ceiling_Violation
: out Boolean) is
300 Self_ID
: constant Task_ID
:= Self
;
301 All_Tasks_Link
: constant Task_ID
:= Self
.Common
.All_Tasks_Link
;
302 Current_Prio
: System
.Any_Priority
;
303 Result
: Interfaces
.C
.int
;
306 Current_Prio
:= Get_Priority
(Self_ID
);
308 -- If there is no other tasks, no need to check priorities
310 if All_Tasks_Link
/= Null_Task
311 and then L
.Prio
< Interfaces
.C
.int
(Current_Prio
)
313 Ceiling_Violation
:= True;
317 Result
:= pthread_mutex_lock
(L
.L
'Access);
318 pragma Assert
(Result
= 0);
320 Ceiling_Violation
:= False;
321 -- Why is this commented out ???
322 -- L.Prio_Save := Interfaces.C.int (Current_Prio);
323 -- Set_Priority (Self_ID, System.Any_Priority (L.Prio));
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
.L
'Access);
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
);
394 Result
: Interfaces
.C
.int
;
398 Result
:= pthread_cond_wait
399 (Self_ID
.Common
.LL
.CV
'Access, Single_RTS_Lock
'Access);
401 Result
:= pthread_cond_wait
402 (Self_ID
.Common
.LL
.CV
'Access, Self_ID
.Common
.LL
.L
'Access);
405 -- EINTR is not considered a failure
407 pragma Assert
(Result
= 0 or else Result
= EINTR
);
409 if Self_ID
.Deferral_Level
= 0
410 and then Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
413 raise Standard
'Abort_Signal;
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 Sleep_Time
: OS_Time
;
432 Result
: Interfaces
.C
.int
;
433 Status
: Cond_Value_Type
;
435 -- The body below requires more comments ???
441 Sleep_Time
:= To_OS_Time
(Time
, Mode
);
443 if Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
444 or else Self_ID
.Pending_Priority_Change
449 Self_ID
.Common
.LL
.AST_Pending
:= True;
452 (Status
, 0, Sleep_Time
,
453 Timer_Sleep_AST
'Access, To_Address
(Self_ID
), 0);
455 if (Status
and 1) /= 1 then
460 Result
:= pthread_cond_wait
461 (Self_ID
.Common
.LL
.CV
'Access, Single_RTS_Lock
'Access);
462 pragma Assert
(Result
= 0);
465 Result
:= pthread_cond_wait
466 (Self_ID
.Common
.LL
.CV
'Access, Self_ID
.Common
.LL
.L
'Access);
467 pragma Assert
(Result
= 0);
472 if not Self_ID
.Common
.LL
.AST_Pending
then
475 Sys_Cantim
(Status
, To_Address
(Self_ID
), 0);
476 pragma Assert
((Status
and 1) = 1);
484 procedure Timed_Delay
487 Mode
: ST
.Delay_Modes
)
489 Sleep_Time
: OS_Time
;
490 Result
: Interfaces
.C
.int
;
491 Status
: Cond_Value_Type
;
492 Yielded
: Boolean := False;
495 -- Only the little window between deferring abort and
496 -- locking Self_ID is the reason we need to
497 -- check for pending abort and priority change below!
503 -- More comments required in body below ???
506 Write_Lock
(Self_ID
);
508 if Time
/= 0.0 or else Mode
/= Relative
then
509 Sleep_Time
:= To_OS_Time
(Time
, Mode
);
511 if Mode
= Relative
or else OS_Clock
< Sleep_Time
then
512 Self_ID
.Common
.State
:= Delay_Sleep
;
513 Self_ID
.Common
.LL
.AST_Pending
:= True;
516 (Status
, 0, Sleep_Time
,
517 Timer_Sleep_AST
'Access, To_Address
(Self_ID
), 0);
519 if (Status
and 1) /= 1 then
524 if Self_ID
.Pending_Priority_Change
then
525 Self_ID
.Pending_Priority_Change
:= False;
526 Self_ID
.Common
.Base_Priority
:= Self_ID
.New_Base_Priority
;
527 Set_Priority
(Self_ID
, Self_ID
.Common
.Base_Priority
);
530 if Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
then
531 Sys_Cantim
(Status
, To_Address
(Self_ID
), 0);
532 pragma Assert
((Status
and 1) = 1);
537 Result
:= pthread_cond_wait
538 (Self_ID
.Common
.LL
.CV
'Access, Single_RTS_Lock
'Access);
539 pragma Assert
(Result
= 0);
541 Result
:= pthread_cond_wait
542 (Self_ID
.Common
.LL
.CV
'Access, Self_ID
.Common
.LL
.L
'Access);
543 pragma Assert
(Result
= 0);
548 exit when not Self_ID
.Common
.LL
.AST_Pending
;
551 Self_ID
.Common
.State
:= Runnable
;
562 Result
:= sched_yield
;
563 pragma Assert
(Result
= 0);
566 SSL
.Abort_Undefer
.all;
569 ---------------------
570 -- Monotonic_Clock --
571 ---------------------
573 function Monotonic_Clock
return Duration
574 renames System
.OS_Primitives
.Monotonic_Clock
;
580 function RT_Resolution
return Duration is
589 procedure Wakeup
(T
: Task_ID
; Reason
: System
.Tasking
.Task_States
) is
590 pragma Unreferenced
(Reason
);
592 Result
: Interfaces
.C
.int
;
595 Result
:= pthread_cond_signal
(T
.Common
.LL
.CV
'Access);
596 pragma Assert
(Result
= 0);
603 procedure Yield
(Do_Yield
: Boolean := True) is
604 Result
: Interfaces
.C
.int
;
605 pragma Unreferenced
(Result
);
608 Result
:= sched_yield
;
616 procedure Set_Priority
618 Prio
: System
.Any_Priority
;
619 Loss_Of_Inheritance
: Boolean := False)
621 pragma Unreferenced
(Loss_Of_Inheritance
);
623 Result
: Interfaces
.C
.int
;
624 Param
: aliased struct_sched_param
;
627 T
.Common
.Current_Priority
:= Prio
;
628 Param
.sched_priority
:= Interfaces
.C
.int
(Underlying_Priorities
(Prio
));
630 if Time_Slice_Val
> 0 then
631 Result
:= pthread_setschedparam
632 (T
.Common
.LL
.Thread
, SCHED_RR
, Param
'Access);
634 elsif FIFO_Within_Priorities
or else Time_Slice_Val
= 0 then
635 Result
:= pthread_setschedparam
636 (T
.Common
.LL
.Thread
, SCHED_FIFO
, Param
'Access);
639 -- SCHED_OTHER priorities are restricted to the range 8 - 15.
640 -- Since the translation from Underlying priorities results
641 -- in a range of 16 - 31, dividing by 2 gives the correct result.
643 Param
.sched_priority
:= Param
.sched_priority
/ 2;
644 Result
:= pthread_setschedparam
645 (T
.Common
.LL
.Thread
, SCHED_OTHER
, Param
'Access);
648 pragma Assert
(Result
= 0);
655 function Get_Priority
(T
: Task_ID
) return System
.Any_Priority
is
657 return T
.Common
.Current_Priority
;
664 procedure Enter_Task
(Self_ID
: Task_ID
) is
666 Self_ID
.Common
.LL
.Thread
:= pthread_self
;
668 Specific
.Set
(Self_ID
);
672 for J
in Known_Tasks
'Range loop
673 if Known_Tasks
(J
) = null then
674 Known_Tasks
(J
) := Self_ID
;
675 Self_ID
.Known_Tasks_Index
:= J
;
687 function New_ATCB
(Entry_Num
: Task_Entry_Index
) return Task_ID
is
689 return new Ada_Task_Control_Block
(Entry_Num
);
696 function Is_Valid_Task
return Boolean renames Specific
.Is_Valid_Task
;
698 -----------------------------
699 -- Register_Foreign_Thread --
700 -----------------------------
702 function Register_Foreign_Thread
return Task_ID
is
704 if Is_Valid_Task
then
707 return Register_Foreign_Thread
(pthread_self
);
709 end Register_Foreign_Thread
;
711 ----------------------
713 ----------------------
715 procedure Initialize_TCB
(Self_ID
: Task_ID
; Succeeded
: out Boolean) is
716 Mutex_Attr
: aliased pthread_mutexattr_t
;
717 Result
: Interfaces
.C
.int
;
718 Cond_Attr
: aliased pthread_condattr_t
;
721 -- More comments required in body below ???
723 if not Single_Lock
then
724 Result
:= pthread_mutexattr_init
(Mutex_Attr
'Access);
725 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
728 Result
:= pthread_mutex_init
(Self_ID
.Common
.LL
.L
'Access,
730 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
738 Result
:= pthread_mutexattr_destroy
(Mutex_Attr
'Access);
739 pragma Assert
(Result
= 0);
742 Result
:= pthread_condattr_init
(Cond_Attr
'Access);
743 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
746 Result
:= pthread_cond_init
(Self_ID
.Common
.LL
.CV
'Access,
748 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
753 Self_ID
.Common
.LL
.Exc_Stack_Ptr
:= new Exc_Stack_T
;
754 SSL
.Set_Exc_Stack_Addr
755 (To_Address
(Self_ID
),
756 Self_ID
.Common
.LL
.Exc_Stack_Ptr
(Exc_Stack_T
'Last)'Address);
759 if not Single_Lock
then
760 Result
:= pthread_mutex_destroy
(Self_ID
.Common
.LL
.L
'Access);
761 pragma Assert
(Result
= 0);
767 Result
:= pthread_condattr_destroy
(Cond_Attr
'Access);
768 pragma Assert
(Result
= 0);
775 procedure Create_Task
777 Wrapper
: System
.Address
;
778 Stack_Size
: System
.Parameters
.Size_Type
;
779 Priority
: System
.Any_Priority
;
780 Succeeded
: out Boolean)
782 Attributes
: aliased pthread_attr_t
;
783 Adjusted_Stack_Size
: Interfaces
.C
.size_t
;
784 Result
: Interfaces
.C
.int
;
786 function Thread_Body_Access
is new
787 Unchecked_Conversion
(System
.Address
, Thread_Body
);
790 if Stack_Size
= Unspecified_Size
then
791 Adjusted_Stack_Size
:= Interfaces
.C
.size_t
(Default_Stack_Size
);
793 elsif Stack_Size
< Minimum_Stack_Size
then
794 Adjusted_Stack_Size
:= Interfaces
.C
.size_t
(Minimum_Stack_Size
);
797 Adjusted_Stack_Size
:= Interfaces
.C
.size_t
(Stack_Size
);
800 -- Since the initial signal mask of a thread is inherited from the
801 -- creator, we need to set our local signal mask mask all signals
802 -- during the creation operation, to make sure the new thread is
803 -- not disturbed by signals before it has set its own Task_ID.
805 Result
:= pthread_attr_init
(Attributes
'Access);
806 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
813 Result
:= pthread_attr_setdetachstate
814 (Attributes
'Access, PTHREAD_CREATE_DETACHED
);
815 pragma Assert
(Result
= 0);
817 Result
:= pthread_attr_setstacksize
818 (Attributes
'Access, Adjusted_Stack_Size
);
819 pragma Assert
(Result
= 0);
821 -- This call may be unnecessary, not sure. ???
824 pthread_attr_setinheritsched
825 (Attributes
'Access, PTHREAD_EXPLICIT_SCHED
);
826 pragma Assert
(Result
= 0);
828 Result
:= pthread_create
829 (T
.Common
.LL
.Thread
'Access,
831 Thread_Body_Access
(Wrapper
),
834 -- ENOMEM is a valid run-time error. Don't shut down.
836 pragma Assert
(Result
= 0
837 or else Result
= EAGAIN
or else Result
= ENOMEM
);
839 Succeeded
:= Result
= 0;
841 Result
:= pthread_attr_destroy
(Attributes
'Access);
842 pragma Assert
(Result
= 0);
845 Set_Priority
(T
, Priority
);
853 procedure Finalize_TCB
(T
: Task_ID
) is
854 Result
: Interfaces
.C
.int
;
856 Is_Self
: constant Boolean := T
= Self
;
858 procedure Free
is new
859 Unchecked_Deallocation
(Ada_Task_Control_Block
, Task_ID
);
861 procedure Free
is new Unchecked_Deallocation
862 (Exc_Stack_T
, Exc_Stack_Ptr_T
);
865 if not Single_Lock
then
866 Result
:= pthread_mutex_destroy
(T
.Common
.LL
.L
'Access);
867 pragma Assert
(Result
= 0);
870 Result
:= pthread_cond_destroy
(T
.Common
.LL
.CV
'Access);
871 pragma Assert
(Result
= 0);
873 if T
.Known_Tasks_Index
/= -1 then
874 Known_Tasks
(T
.Known_Tasks_Index
) := null;
877 Free
(T
.Common
.LL
.Exc_Stack_Ptr
);
890 procedure Exit_Task
is
899 procedure Abort_Task
(T
: Task_ID
) is
901 -- Interrupt Server_Tasks may be waiting on an event flag
903 if T
.Common
.State
= Interrupt_Server_Blocked_On_Event_Flag
then
904 Wakeup
(T
, Interrupt_Server_Blocked_On_Event_Flag
);
914 function Check_Exit
(Self_ID
: ST
.Task_ID
) return Boolean is
915 pragma Unreferenced
(Self_ID
);
925 function Check_No_Locks
(Self_ID
: ST
.Task_ID
) return Boolean is
926 pragma Unreferenced
(Self_ID
);
932 ----------------------
933 -- Environment_Task --
934 ----------------------
936 function Environment_Task
return Task_ID
is
938 return Environment_Task_ID
;
939 end Environment_Task
;
945 procedure Lock_RTS
is
947 Write_Lock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
954 procedure Unlock_RTS
is
956 Unlock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
963 function Suspend_Task
965 Thread_Self
: Thread_Id
) return Boolean
967 pragma Unreferenced
(T
);
968 pragma Unreferenced
(Thread_Self
);
980 Thread_Self
: Thread_Id
) return Boolean
982 pragma Unreferenced
(T
);
983 pragma Unreferenced
(Thread_Self
);
992 procedure Initialize
(Environment_Task
: Task_ID
) is
994 Environment_Task_ID
:= Environment_Task
;
996 -- Initialize the lock used to synchronize chain of all ATCBs
998 Initialize_Lock
(Single_RTS_Lock
'Access, RTS_Lock_Level
);
1000 Specific
.Initialize
(Environment_Task
);
1002 Enter_Task
(Environment_Task
);
1005 end System
.Task_Primitives
.Operations
;