1 ------------------------------------------------------------------------------
3 -- GNAT 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) 1992-2008, 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 OpenVMS/Alpha version of this package
36 -- This package contains all the GNULL primitives that interface directly with
40 -- Turn off polling, we do not want ATC polling to take place during tasking
41 -- operations. It causes infinite loops and other problems.
43 with Ada
.Unchecked_Conversion
;
44 with Ada
.Unchecked_Deallocation
;
48 with System
.Tasking
.Debug
;
49 with System
.OS_Primitives
;
50 with System
.Soft_Links
;
53 package body System
.Task_Primitives
.Operations
is
55 use System
.Tasking
.Debug
;
58 use System
.OS_Interface
;
59 use System
.Parameters
;
60 use System
.OS_Primitives
;
61 use type System
.OS_Primitives
.OS_Time
;
63 package SSL
renames System
.Soft_Links
;
69 -- The followings are logically constants, but need to be initialized
72 Single_RTS_Lock
: aliased RTS_Lock
;
73 -- This is a lock to allow only one thread of control in the RTS at
74 -- a time; it is used to execute in mutual exclusion from all other tasks.
75 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
77 ATCB_Key
: aliased pthread_key_t
;
78 -- Key used to find the Ada Task_Id associated with a thread
80 Environment_Task_Id
: Task_Id
;
81 -- A variable to hold Task_Id for the environment task
83 Time_Slice_Val
: Integer;
84 pragma Import
(C
, Time_Slice_Val
, "__gl_time_slice_val");
86 Dispatching_Policy
: Character;
87 pragma Import
(C
, Dispatching_Policy
, "__gl_task_dispatching_policy");
89 Foreign_Task_Elaborated
: aliased Boolean := True;
90 -- Used to identified fake tasks (i.e., non-Ada Threads)
98 procedure Initialize
(Environment_Task
: Task_Id
);
99 pragma Inline
(Initialize
);
100 -- Initialize various data needed by this package
102 function Is_Valid_Task
return Boolean;
103 pragma Inline
(Is_Valid_Task
);
104 -- Does executing thread have a TCB?
106 procedure Set
(Self_Id
: Task_Id
);
108 -- Set the self id for the current task
110 function Self
return Task_Id
;
111 pragma Inline
(Self
);
112 -- Return a pointer to the Ada Task Control Block of the calling task
116 package body Specific
is separate;
117 -- The body of this package is target specific
119 ---------------------------------
120 -- Support for foreign threads --
121 ---------------------------------
123 function Register_Foreign_Thread
(Thread
: Thread_Id
) return Task_Id
;
124 -- Allocate and Initialize a new ATCB for the current Thread
126 function Register_Foreign_Thread
127 (Thread
: Thread_Id
) return Task_Id
is separate;
129 -----------------------
130 -- Local Subprograms --
131 -----------------------
133 function To_Task_Id
is
134 new Ada
.Unchecked_Conversion
135 (System
.Task_Primitives
.Task_Address
, Task_Id
);
137 function To_Address
is
138 new Ada
.Unchecked_Conversion
139 (Task_Id
, System
.Task_Primitives
.Task_Address
);
141 function Get_Exc_Stack_Addr
return Address
;
142 -- Replace System.Soft_Links.Get_Exc_Stack_Addr_NT
144 procedure Timer_Sleep_AST
(ID
: Address
);
145 pragma Convention
(C
, Timer_Sleep_AST
);
146 -- Signal the condition variable when AST fires
148 procedure Timer_Sleep_AST
(ID
: Address
) is
149 Result
: Interfaces
.C
.int
;
150 pragma Warnings
(Off
, Result
);
151 Self_ID
: constant Task_Id
:= To_Task_Id
(ID
);
153 Self_ID
.Common
.LL
.AST_Pending
:= False;
154 Result
:= pthread_cond_signal_int_np
(Self_ID
.Common
.LL
.CV
'Access);
155 pragma Assert
(Result
= 0);
162 -- The underlying thread system sets a guard page at the bottom of a thread
163 -- stack, so nothing is needed.
164 -- ??? Check the comment above
166 procedure Stack_Guard
(T
: ST
.Task_Id
; On
: Boolean) is
167 pragma Unreferenced
(T
);
168 pragma Unreferenced
(On
);
177 function Get_Thread_Id
(T
: ST
.Task_Id
) return OSI
.Thread_Id
is
179 return T
.Common
.LL
.Thread
;
186 function Self
return Task_Id
renames Specific
.Self
;
188 ---------------------
189 -- Initialize_Lock --
190 ---------------------
192 -- Note: mutexes and cond_variables needed per-task basis are initialized
193 -- in Initialize_TCB and the Storage_Error is handled. Other mutexes (such
194 -- as RTS_Lock, Memory_Lock...) used in RTS is initialized before any
195 -- status change of RTS. Therefore raising Storage_Error in the following
196 -- routines should be able to be handled safely.
198 procedure Initialize_Lock
199 (Prio
: System
.Any_Priority
;
200 L
: not null access Lock
)
202 Attributes
: aliased pthread_mutexattr_t
;
203 Result
: Interfaces
.C
.int
;
206 Result
:= pthread_mutexattr_init
(Attributes
'Access);
207 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
209 if Result
= ENOMEM
then
214 L
.Prio
:= Interfaces
.C
.int
(Prio
);
216 Result
:= pthread_mutex_init
(L
.L
'Access, Attributes
'Access);
217 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
219 if Result
= ENOMEM
then
223 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
224 pragma Assert
(Result
= 0);
227 procedure Initialize_Lock
228 (L
: not null access RTS_Lock
;
231 pragma Unreferenced
(Level
);
233 Attributes
: aliased pthread_mutexattr_t
;
234 Result
: Interfaces
.C
.int
;
237 Result
:= pthread_mutexattr_init
(Attributes
'Access);
238 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
240 if Result
= ENOMEM
then
244 -- Don't use, see comment in s-osinte.ads about ERRORCHECK mutexes???
245 -- Result := pthread_mutexattr_settype_np
246 -- (Attributes'Access, PTHREAD_MUTEX_ERRORCHECK_NP);
247 -- pragma Assert (Result = 0);
249 -- Result := pthread_mutexattr_setprotocol
250 -- (Attributes'Access, PTHREAD_PRIO_PROTECT);
251 -- pragma Assert (Result = 0);
253 -- Result := pthread_mutexattr_setprioceiling
254 -- (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
255 -- pragma Assert (Result = 0);
257 Result
:= pthread_mutex_init
(L
, Attributes
'Access);
259 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
261 if Result
= ENOMEM
then
265 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
266 pragma Assert
(Result
= 0);
273 procedure Finalize_Lock
(L
: not null access Lock
) is
274 Result
: Interfaces
.C
.int
;
276 Result
:= pthread_mutex_destroy
(L
.L
'Access);
277 pragma Assert
(Result
= 0);
280 procedure Finalize_Lock
(L
: not null access RTS_Lock
) is
281 Result
: Interfaces
.C
.int
;
283 Result
:= pthread_mutex_destroy
(L
);
284 pragma Assert
(Result
= 0);
292 (L
: not null access Lock
;
293 Ceiling_Violation
: out Boolean)
295 Self_ID
: constant Task_Id
:= Self
;
296 All_Tasks_Link
: constant Task_Id
:= Self
.Common
.All_Tasks_Link
;
297 Current_Prio
: System
.Any_Priority
;
298 Result
: Interfaces
.C
.int
;
301 Current_Prio
:= Get_Priority
(Self_ID
);
303 -- If there is no other tasks, no need to check priorities
305 if All_Tasks_Link
/= Null_Task
306 and then L
.Prio
< Interfaces
.C
.int
(Current_Prio
)
308 Ceiling_Violation
:= True;
312 Result
:= pthread_mutex_lock
(L
.L
'Access);
313 pragma Assert
(Result
= 0);
315 Ceiling_Violation
:= False;
316 -- Why is this commented out ???
317 -- L.Prio_Save := Interfaces.C.int (Current_Prio);
318 -- Set_Priority (Self_ID, System.Any_Priority (L.Prio));
322 (L
: not null access RTS_Lock
;
323 Global_Lock
: Boolean := False)
325 Result
: Interfaces
.C
.int
;
327 if not Single_Lock
or else Global_Lock
then
328 Result
:= pthread_mutex_lock
(L
);
329 pragma Assert
(Result
= 0);
333 procedure Write_Lock
(T
: Task_Id
) is
334 Result
: Interfaces
.C
.int
;
336 if not Single_Lock
then
337 Result
:= pthread_mutex_lock
(T
.Common
.LL
.L
'Access);
338 pragma Assert
(Result
= 0);
347 (L
: not null access Lock
;
348 Ceiling_Violation
: out Boolean)
351 Write_Lock
(L
, Ceiling_Violation
);
358 procedure Unlock
(L
: not null access Lock
) is
359 Result
: Interfaces
.C
.int
;
361 Result
:= pthread_mutex_unlock
(L
.L
'Access);
362 pragma Assert
(Result
= 0);
366 (L
: not null access RTS_Lock
;
367 Global_Lock
: Boolean := False)
369 Result
: Interfaces
.C
.int
;
371 if not Single_Lock
or else Global_Lock
then
372 Result
:= pthread_mutex_unlock
(L
);
373 pragma Assert
(Result
= 0);
377 procedure Unlock
(T
: Task_Id
) is
378 Result
: Interfaces
.C
.int
;
380 if not Single_Lock
then
381 Result
:= pthread_mutex_unlock
(T
.Common
.LL
.L
'Access);
382 pragma Assert
(Result
= 0);
390 -- Dynamic priority ceilings are not supported by the underlying system
392 procedure Set_Ceiling
393 (L
: not null access Lock
;
394 Prio
: System
.Any_Priority
)
396 pragma Unreferenced
(L
, Prio
);
407 Reason
: System
.Tasking
.Task_States
)
409 pragma Unreferenced
(Reason
);
410 Result
: Interfaces
.C
.int
;
416 (Self_ID
.Common
.LL
.CV
'Access, Single_RTS_Lock
'Access);
420 (Self_ID
.Common
.LL
.CV
'Access, Self_ID
.Common
.LL
.L
'Access);
423 -- EINTR is not considered a failure
425 pragma Assert
(Result
= 0 or else Result
= EINTR
);
427 if Self_ID
.Deferral_Level
= 0
428 and then Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
431 raise Standard
'Abort_Signal;
439 procedure Timed_Sleep
442 Mode
: ST
.Delay_Modes
;
443 Reason
: System
.Tasking
.Task_States
;
444 Timedout
: out Boolean;
445 Yielded
: out Boolean)
447 pragma Unreferenced
(Reason
);
449 Sleep_Time
: OS_Time
;
450 Result
: Interfaces
.C
.int
;
451 Status
: Cond_Value_Type
;
453 -- The body below requires more comments ???
459 Sleep_Time
:= To_OS_Time
(Time
, Mode
);
461 if Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
then
465 Self_ID
.Common
.LL
.AST_Pending
:= True;
468 (Status
, 0, Sleep_Time
,
469 Timer_Sleep_AST
'Access, To_Address
(Self_ID
), 0);
471 if (Status
and 1) /= 1 then
478 (Self_ID
.Common
.LL
.CV
'Access, Single_RTS_Lock
'Access);
479 pragma Assert
(Result
= 0);
484 (Self_ID
.Common
.LL
.CV
'Access, Self_ID
.Common
.LL
.L
'Access);
485 pragma Assert
(Result
= 0);
490 if not Self_ID
.Common
.LL
.AST_Pending
then
493 Sys_Cantim
(Status
, To_Address
(Self_ID
), 0);
494 pragma Assert
((Status
and 1) = 1);
502 procedure Timed_Delay
505 Mode
: ST
.Delay_Modes
)
507 Sleep_Time
: OS_Time
;
508 Result
: Interfaces
.C
.int
;
509 Status
: Cond_Value_Type
;
510 Yielded
: Boolean := False;
517 -- More comments required in body below ???
519 Write_Lock
(Self_ID
);
521 if Time
/= 0.0 or else Mode
/= Relative
then
522 Sleep_Time
:= To_OS_Time
(Time
, Mode
);
524 if Mode
= Relative
or else OS_Clock
<= Sleep_Time
then
525 Self_ID
.Common
.State
:= Delay_Sleep
;
526 Self_ID
.Common
.LL
.AST_Pending
:= True;
529 (Status
, 0, Sleep_Time
,
530 Timer_Sleep_AST
'Access, To_Address
(Self_ID
), 0);
532 -- Comment following test
534 if (Status
and 1) /= 1 then
539 if Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
then
540 Sys_Cantim
(Status
, To_Address
(Self_ID
), 0);
541 pragma Assert
((Status
and 1) = 1);
548 (Self_ID
.Common
.LL
.CV
'Access,
549 Single_RTS_Lock
'Access);
550 pragma Assert
(Result
= 0);
554 (Self_ID
.Common
.LL
.CV
'Access,
555 Self_ID
.Common
.LL
.L
'Access);
556 pragma Assert
(Result
= 0);
561 exit when not Self_ID
.Common
.LL
.AST_Pending
;
564 Self_ID
.Common
.State
:= Runnable
;
575 Result
:= sched_yield
;
576 pragma Assert
(Result
= 0);
580 ---------------------
581 -- Monotonic_Clock --
582 ---------------------
584 function Monotonic_Clock
return Duration
585 renames System
.OS_Primitives
.Monotonic_Clock
;
591 function RT_Resolution
return Duration is
593 -- Document origin of this magic constant ???
601 procedure Wakeup
(T
: Task_Id
; Reason
: System
.Tasking
.Task_States
) is
602 pragma Unreferenced
(Reason
);
603 Result
: Interfaces
.C
.int
;
605 Result
:= pthread_cond_signal
(T
.Common
.LL
.CV
'Access);
606 pragma Assert
(Result
= 0);
613 procedure Yield
(Do_Yield
: Boolean := True) is
614 Result
: Interfaces
.C
.int
;
615 pragma Unreferenced
(Result
);
618 Result
:= sched_yield
;
626 procedure Set_Priority
628 Prio
: System
.Any_Priority
;
629 Loss_Of_Inheritance
: Boolean := False)
631 pragma Unreferenced
(Loss_Of_Inheritance
);
633 Result
: Interfaces
.C
.int
;
634 Param
: aliased struct_sched_param
;
636 function Get_Policy
(Prio
: System
.Any_Priority
) return Character;
637 pragma Import
(C
, Get_Policy
, "__gnat_get_specific_dispatching");
638 -- Get priority specific dispatching policy
640 Priority_Specific_Policy
: constant Character := Get_Policy
(Prio
);
641 -- Upper case first character of the policy name corresponding to the
642 -- task as set by a Priority_Specific_Dispatching pragma.
645 T
.Common
.Current_Priority
:= Prio
;
646 Param
.sched_priority
:= Interfaces
.C
.int
(Underlying_Priorities
(Prio
));
648 if Dispatching_Policy
= 'R'
649 or else Priority_Specific_Policy
= 'R'
650 or else Time_Slice_Val
> 0
653 pthread_setschedparam
654 (T
.Common
.LL
.Thread
, SCHED_RR
, Param
'Access);
656 elsif Dispatching_Policy
= 'F'
657 or else Priority_Specific_Policy
= 'F'
658 or else Time_Slice_Val
= 0
661 pthread_setschedparam
662 (T
.Common
.LL
.Thread
, SCHED_FIFO
, Param
'Access);
665 -- SCHED_OTHER priorities are restricted to the range 8 - 15.
666 -- Since the translation from Underlying priorities results
667 -- in a range of 16 - 31, dividing by 2 gives the correct result.
669 Param
.sched_priority
:= Param
.sched_priority
/ 2;
671 pthread_setschedparam
672 (T
.Common
.LL
.Thread
, SCHED_OTHER
, Param
'Access);
675 pragma Assert
(Result
= 0);
682 function Get_Priority
(T
: Task_Id
) return System
.Any_Priority
is
684 return T
.Common
.Current_Priority
;
691 procedure Enter_Task
(Self_ID
: Task_Id
) is
693 Self_ID
.Common
.LL
.Thread
:= pthread_self
;
695 Specific
.Set
(Self_ID
);
699 for J
in Known_Tasks
'Range loop
700 if Known_Tasks
(J
) = null then
701 Known_Tasks
(J
) := Self_ID
;
702 Self_ID
.Known_Tasks_Index
:= J
;
714 function New_ATCB
(Entry_Num
: Task_Entry_Index
) return Task_Id
is
716 return new Ada_Task_Control_Block
(Entry_Num
);
723 function Is_Valid_Task
return Boolean renames Specific
.Is_Valid_Task
;
725 -----------------------------
726 -- Register_Foreign_Thread --
727 -----------------------------
729 function Register_Foreign_Thread
return Task_Id
is
731 if Is_Valid_Task
then
734 return Register_Foreign_Thread
(pthread_self
);
736 end Register_Foreign_Thread
;
742 procedure Initialize_TCB
(Self_ID
: Task_Id
; Succeeded
: out Boolean) is
743 Mutex_Attr
: aliased pthread_mutexattr_t
;
744 Result
: Interfaces
.C
.int
;
745 Cond_Attr
: aliased pthread_condattr_t
;
748 -- More comments required in body below ???
750 if not Single_Lock
then
751 Result
:= pthread_mutexattr_init
(Mutex_Attr
'Access);
752 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
757 (Self_ID
.Common
.LL
.L
'Access, Mutex_Attr
'Access);
758 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
766 Result
:= pthread_mutexattr_destroy
(Mutex_Attr
'Access);
767 pragma Assert
(Result
= 0);
770 Result
:= pthread_condattr_init
(Cond_Attr
'Access);
771 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
776 (Self_ID
.Common
.LL
.CV
'Access, Cond_Attr
'Access);
777 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
782 Self_ID
.Common
.LL
.Exc_Stack_Ptr
:= new Exc_Stack_T
;
785 if not Single_Lock
then
786 Result
:= pthread_mutex_destroy
(Self_ID
.Common
.LL
.L
'Access);
787 pragma Assert
(Result
= 0);
793 Result
:= pthread_condattr_destroy
(Cond_Attr
'Access);
794 pragma Assert
(Result
= 0);
797 ------------------------
798 -- Get_Exc_Stack_Addr --
799 ------------------------
801 function Get_Exc_Stack_Addr
return Address
is
803 return Self
.Common
.LL
.Exc_Stack_Ptr
(Exc_Stack_T
'Last)'Address;
804 end Get_Exc_Stack_Addr
;
810 procedure Create_Task
812 Wrapper
: System
.Address
;
813 Stack_Size
: System
.Parameters
.Size_Type
;
814 Priority
: System
.Any_Priority
;
815 Succeeded
: out Boolean)
817 Attributes
: aliased pthread_attr_t
;
818 Result
: Interfaces
.C
.int
;
820 function Thread_Body_Access
is new
821 Ada
.Unchecked_Conversion
(System
.Aux_DEC
.Short_Address
, Thread_Body
);
824 -- Since the initial signal mask of a thread is inherited from the
825 -- creator, we need to set our local signal mask to mask all signals
826 -- during the creation operation, to make sure the new thread is
827 -- not disturbed by signals before it has set its own Task_Id.
829 Result
:= pthread_attr_init
(Attributes
'Access);
830 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
837 Result
:= pthread_attr_setdetachstate
838 (Attributes
'Access, PTHREAD_CREATE_DETACHED
);
839 pragma Assert
(Result
= 0);
841 Result
:= pthread_attr_setstacksize
842 (Attributes
'Access, Interfaces
.C
.size_t
(Stack_Size
));
843 pragma Assert
(Result
= 0);
845 -- This call may be unnecessary, not sure. ???
848 pthread_attr_setinheritsched
849 (Attributes
'Access, PTHREAD_EXPLICIT_SCHED
);
850 pragma Assert
(Result
= 0);
854 (T
.Common
.LL
.Thread
'Access,
856 Thread_Body_Access
(Wrapper
),
859 -- ENOMEM is a valid run-time error -- do not shut down
861 pragma Assert
(Result
= 0
862 or else Result
= EAGAIN
or else Result
= ENOMEM
);
864 Succeeded
:= Result
= 0;
866 Result
:= pthread_attr_destroy
(Attributes
'Access);
867 pragma Assert
(Result
= 0);
870 Set_Priority
(T
, Priority
);
878 procedure Finalize_TCB
(T
: Task_Id
) is
879 Result
: Interfaces
.C
.int
;
881 Is_Self
: constant Boolean := T
= Self
;
883 procedure Free
is new
884 Ada
.Unchecked_Deallocation
(Ada_Task_Control_Block
, Task_Id
);
886 procedure Free
is new Ada
.Unchecked_Deallocation
887 (Exc_Stack_T
, Exc_Stack_Ptr_T
);
890 if not Single_Lock
then
891 Result
:= pthread_mutex_destroy
(T
.Common
.LL
.L
'Access);
892 pragma Assert
(Result
= 0);
895 Result
:= pthread_cond_destroy
(T
.Common
.LL
.CV
'Access);
896 pragma Assert
(Result
= 0);
898 if T
.Known_Tasks_Index
/= -1 then
899 Known_Tasks
(T
.Known_Tasks_Index
) := null;
902 Free
(T
.Common
.LL
.Exc_Stack_Ptr
);
914 procedure Exit_Task
is
923 procedure Abort_Task
(T
: Task_Id
) is
925 -- Interrupt Server_Tasks may be waiting on an event flag
927 if T
.Common
.State
= Interrupt_Server_Blocked_On_Event_Flag
then
928 Wakeup
(T
, Interrupt_Server_Blocked_On_Event_Flag
);
936 procedure Initialize
(S
: in out Suspension_Object
) is
937 Mutex_Attr
: aliased pthread_mutexattr_t
;
938 Cond_Attr
: aliased pthread_condattr_t
;
939 Result
: Interfaces
.C
.int
;
941 -- Initialize internal state (always to False (D.10 (6)))
946 -- Initialize internal mutex
948 Result
:= pthread_mutexattr_init
(Mutex_Attr
'Access);
949 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
951 if Result
= ENOMEM
then
955 Result
:= pthread_mutex_init
(S
.L
'Access, Mutex_Attr
'Access);
956 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
958 if Result
= ENOMEM
then
959 Result
:= pthread_mutexattr_destroy
(Mutex_Attr
'Access);
960 pragma Assert
(Result
= 0);
965 Result
:= pthread_mutexattr_destroy
(Mutex_Attr
'Access);
966 pragma Assert
(Result
= 0);
968 -- Initialize internal condition variable
970 Result
:= pthread_condattr_init
(Cond_Attr
'Access);
971 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
974 Result
:= pthread_mutex_destroy
(S
.L
'Access);
975 pragma Assert
(Result
= 0);
977 if Result
= ENOMEM
then
982 Result
:= pthread_cond_init
(S
.CV
'Access, Cond_Attr
'Access);
983 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
986 Result
:= pthread_mutex_destroy
(S
.L
'Access);
987 pragma Assert
(Result
= 0);
989 if Result
= ENOMEM
then
990 Result
:= pthread_condattr_destroy
(Cond_Attr
'Access);
991 pragma Assert
(Result
= 0);
997 Result
:= pthread_condattr_destroy
(Cond_Attr
'Access);
998 pragma Assert
(Result
= 0);
1005 procedure Finalize
(S
: in out Suspension_Object
) is
1006 Result
: Interfaces
.C
.int
;
1009 -- Destroy internal mutex
1011 Result
:= pthread_mutex_destroy
(S
.L
'Access);
1012 pragma Assert
(Result
= 0);
1014 -- Destroy internal condition variable
1016 Result
:= pthread_cond_destroy
(S
.CV
'Access);
1017 pragma Assert
(Result
= 0);
1024 function Current_State
(S
: Suspension_Object
) return Boolean is
1026 -- We do not want to use lock on this read operation. State is marked
1027 -- as Atomic so that we ensure that the value retrieved is correct.
1036 procedure Set_False
(S
: in out Suspension_Object
) is
1037 Result
: Interfaces
.C
.int
;
1040 SSL
.Abort_Defer
.all;
1042 Result
:= pthread_mutex_lock
(S
.L
'Access);
1043 pragma Assert
(Result
= 0);
1047 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1048 pragma Assert
(Result
= 0);
1050 SSL
.Abort_Undefer
.all;
1057 procedure Set_True
(S
: in out Suspension_Object
) is
1058 Result
: Interfaces
.C
.int
;
1061 SSL
.Abort_Defer
.all;
1063 Result
:= pthread_mutex_lock
(S
.L
'Access);
1064 pragma Assert
(Result
= 0);
1066 -- If there is already a task waiting on this suspension object then
1067 -- we resume it, leaving the state of the suspension object to False,
1068 -- as specified in (RM D.10(9)), otherwise leave state set to True.
1074 Result
:= pthread_cond_signal
(S
.CV
'Access);
1075 pragma Assert
(Result
= 0);
1081 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1082 pragma Assert
(Result
= 0);
1084 SSL
.Abort_Undefer
.all;
1087 ------------------------
1088 -- Suspend_Until_True --
1089 ------------------------
1091 procedure Suspend_Until_True
(S
: in out Suspension_Object
) is
1092 Result
: Interfaces
.C
.int
;
1095 SSL
.Abort_Defer
.all;
1097 Result
:= pthread_mutex_lock
(S
.L
'Access);
1098 pragma Assert
(Result
= 0);
1102 -- Program_Error must be raised upon calling Suspend_Until_True
1103 -- if another task is already waiting on that suspension object
1106 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1107 pragma Assert
(Result
= 0);
1109 SSL
.Abort_Undefer
.all;
1111 raise Program_Error
;
1114 -- Suspend the task if the state is False. Otherwise, the task
1115 -- continues its execution, and the state of the suspension object
1116 -- is set to False (ARM D.10 par. 9).
1122 Result
:= pthread_cond_wait
(S
.CV
'Access, S
.L
'Access);
1125 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1126 pragma Assert
(Result
= 0);
1128 SSL
.Abort_Undefer
.all;
1130 end Suspend_Until_True
;
1138 function Check_Exit
(Self_ID
: ST
.Task_Id
) return Boolean is
1139 pragma Unreferenced
(Self_ID
);
1144 --------------------
1145 -- Check_No_Locks --
1146 --------------------
1148 function Check_No_Locks
(Self_ID
: ST
.Task_Id
) return Boolean is
1149 pragma Unreferenced
(Self_ID
);
1154 ----------------------
1155 -- Environment_Task --
1156 ----------------------
1158 function Environment_Task
return Task_Id
is
1160 return Environment_Task_Id
;
1161 end Environment_Task
;
1167 procedure Lock_RTS
is
1169 Write_Lock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
1176 procedure Unlock_RTS
is
1178 Unlock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
1185 function Suspend_Task
1187 Thread_Self
: Thread_Id
) return Boolean
1189 pragma Unreferenced
(T
);
1190 pragma Unreferenced
(Thread_Self
);
1199 function Resume_Task
1201 Thread_Self
: Thread_Id
) return Boolean
1203 pragma Unreferenced
(T
);
1204 pragma Unreferenced
(Thread_Self
);
1209 --------------------
1210 -- Stop_All_Tasks --
1211 --------------------
1213 procedure Stop_All_Tasks
is
1222 function Stop_Task
(T
: ST
.Task_Id
) return Boolean is
1223 pragma Unreferenced
(T
);
1232 function Continue_Task
(T
: ST
.Task_Id
) return Boolean is
1233 pragma Unreferenced
(T
);
1242 procedure Initialize
(Environment_Task
: Task_Id
) is
1244 Environment_Task_Id
:= Environment_Task
;
1246 SSL
.Get_Exc_Stack_Addr
:= Get_Exc_Stack_Addr
'Access;
1248 -- Initialize the lock used to synchronize chain of all ATCBs
1250 Initialize_Lock
(Single_RTS_Lock
'Access, RTS_Lock_Level
);
1252 Specific
.Initialize
(Environment_Task
);
1254 Enter_Task
(Environment_Task
);
1257 end System
.Task_Primitives
.Operations
;