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 IRIX (pthread library) 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
.Task_Info
;
49 with System
.Tasking
.Debug
;
50 with System
.Interrupt_Management
;
51 with System
.OS_Primitives
;
54 with System
.Soft_Links
;
55 -- We use System.Soft_Links instead of System.Tasking.Initialization
56 -- because the later is a higher level package that we shouldn't depend on.
57 -- For example when using the restricted run time, it is replaced by
58 -- System.Tasking.Restricted.Stages.
60 package body System
.Task_Primitives
.Operations
is
62 package SSL
renames System
.Soft_Links
;
65 use System
.Tasking
.Debug
;
67 use System
.OS_Interface
;
68 use System
.OS_Primitives
;
69 use System
.Parameters
;
75 -- The followings are logically constants, but need to be initialized
78 Single_RTS_Lock
: aliased RTS_Lock
;
79 -- This is a lock to allow only one thread of control in the RTS at
80 -- a time; it is used to execute in mutual exclusion from all other tasks.
81 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
83 ATCB_Key
: aliased pthread_key_t
;
84 -- Key used to find the Ada Task_Id associated with a thread
86 Environment_Task_Id
: Task_Id
;
87 -- A variable to hold Task_Id for the environment task
89 Locking_Policy
: Character;
90 pragma Import
(C
, Locking_Policy
, "__gl_locking_policy");
92 Time_Slice_Val
: Integer;
93 pragma Import
(C
, Time_Slice_Val
, "__gl_time_slice_val");
95 Dispatching_Policy
: Character;
96 pragma Import
(C
, Dispatching_Policy
, "__gl_task_dispatching_policy");
98 Real_Time_Clock_Id
: constant clockid_t
:= CLOCK_REALTIME
;
100 Unblocked_Signal_Mask
: aliased sigset_t
;
102 Foreign_Task_Elaborated
: aliased Boolean := True;
103 -- Used to identified fake tasks (i.e., non-Ada Threads)
111 procedure Initialize
(Environment_Task
: Task_Id
);
112 pragma Inline
(Initialize
);
113 -- Initialize various data needed by this package
115 function Is_Valid_Task
return Boolean;
116 pragma Inline
(Is_Valid_Task
);
117 -- Does executing thread have a TCB?
119 procedure Set
(Self_Id
: Task_Id
);
121 -- Set the self id for the current task
123 function Self
return Task_Id
;
124 pragma Inline
(Self
);
125 -- Return a pointer to the Ada Task Control Block of the calling task
129 package body Specific
is separate;
130 -- The body of this package is target specific
132 ---------------------------------
133 -- Support for foreign threads --
134 ---------------------------------
136 function Register_Foreign_Thread
(Thread
: Thread_Id
) return Task_Id
;
137 -- Allocate and Initialize a new ATCB for the current Thread
139 function Register_Foreign_Thread
140 (Thread
: Thread_Id
) return Task_Id
is separate;
142 -----------------------
143 -- Local Subprograms --
144 -----------------------
146 function To_Address
is
147 new Ada
.Unchecked_Conversion
(Task_Id
, System
.Address
);
149 procedure Abort_Handler
(Sig
: Signal
);
150 -- Signal handler used to implement asynchronous abort
156 procedure Abort_Handler
(Sig
: Signal
) is
157 pragma Unreferenced
(Sig
);
159 T
: constant Task_Id
:= Self
;
160 Result
: Interfaces
.C
.int
;
161 Old_Set
: aliased sigset_t
;
164 -- It is not safe to raise an exception when using ZCX and the GCC
165 -- exception handling mechanism.
167 if ZCX_By_Default
and then GCC_ZCX_Support
then
171 if T
.Deferral_Level
= 0
172 and then T
.Pending_ATC_Level
< T
.ATC_Nesting_Level
174 -- Make sure signals used for RTS internal purpose are unmasked
176 Result
:= pthread_sigmask
178 Unblocked_Signal_Mask
'Access,
180 pragma Assert
(Result
= 0);
182 raise Standard
'Abort_Signal;
190 -- The underlying thread system sets a guard page at the
191 -- bottom of a thread stack, so nothing is needed.
193 procedure Stack_Guard
(T
: ST
.Task_Id
; On
: Boolean) is
194 pragma Unreferenced
(On
);
195 pragma Unreferenced
(T
);
204 function Get_Thread_Id
(T
: ST
.Task_Id
) return OSI
.Thread_Id
is
206 return T
.Common
.LL
.Thread
;
213 function Self
return Task_Id
renames Specific
.Self
;
215 ---------------------
216 -- Initialize_Lock --
217 ---------------------
219 -- Note: mutexes and cond_variables needed per-task basis are initialized
220 -- in Initialize_TCB and the Storage_Error is handled. Other mutexes (such
221 -- as RTS_Lock, Memory_Lock...) used in RTS is initialized before any
222 -- status change of RTS. Therefore raising Storage_Error in the following
223 -- routines should be able to be handled safely.
225 procedure Initialize_Lock
226 (Prio
: System
.Any_Priority
;
227 L
: not null access Lock
)
229 Attributes
: aliased pthread_mutexattr_t
;
230 Result
: Interfaces
.C
.int
;
233 Result
:= pthread_mutexattr_init
(Attributes
'Access);
234 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
236 if Result
= ENOMEM
then
240 if Locking_Policy
= 'C' then
242 pthread_mutexattr_setprotocol
243 (Attributes
'Access, PTHREAD_PRIO_PROTECT
);
244 pragma Assert
(Result
= 0);
247 pthread_mutexattr_setprioceiling
248 (Attributes
'Access, Interfaces
.C
.int
(Prio
));
249 pragma Assert
(Result
= 0);
252 Result
:= pthread_mutex_init
(L
, Attributes
'Access);
253 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
255 if Result
= ENOMEM
then
256 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
260 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
261 pragma Assert
(Result
= 0);
264 procedure Initialize_Lock
265 (L
: not null access RTS_Lock
;
268 pragma Unreferenced
(Level
);
270 Attributes
: aliased pthread_mutexattr_t
;
271 Result
: Interfaces
.C
.int
;
274 Result
:= pthread_mutexattr_init
(Attributes
'Access);
275 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
277 if Result
= ENOMEM
then
281 if Locking_Policy
= 'C' then
282 Result
:= pthread_mutexattr_setprotocol
283 (Attributes
'Access, PTHREAD_PRIO_PROTECT
);
284 pragma Assert
(Result
= 0);
286 Result
:= pthread_mutexattr_setprioceiling
287 (Attributes
'Access, Interfaces
.C
.int
(System
.Any_Priority
'Last));
288 pragma Assert
(Result
= 0);
291 Result
:= pthread_mutex_init
(L
, Attributes
'Access);
293 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
295 if Result
= ENOMEM
then
296 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
300 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
301 pragma Assert
(Result
= 0);
308 procedure Finalize_Lock
(L
: not null access Lock
) is
309 Result
: Interfaces
.C
.int
;
311 Result
:= pthread_mutex_destroy
(L
);
312 pragma Assert
(Result
= 0);
315 procedure Finalize_Lock
(L
: not null access RTS_Lock
) is
316 Result
: Interfaces
.C
.int
;
318 Result
:= pthread_mutex_destroy
(L
);
319 pragma Assert
(Result
= 0);
327 (L
: not null access Lock
; Ceiling_Violation
: out Boolean)
329 Result
: Interfaces
.C
.int
;
332 Result
:= pthread_mutex_lock
(L
);
333 Ceiling_Violation
:= Result
= EINVAL
;
335 -- Assumes the cause of EINVAL is a priority ceiling violation
337 pragma Assert
(Result
= 0 or else Result
= EINVAL
);
341 (L
: not null access RTS_Lock
;
342 Global_Lock
: Boolean := False)
344 Result
: Interfaces
.C
.int
;
346 if not Single_Lock
or else Global_Lock
then
347 Result
:= pthread_mutex_lock
(L
);
348 pragma Assert
(Result
= 0);
352 procedure Write_Lock
(T
: Task_Id
) is
353 Result
: Interfaces
.C
.int
;
355 if not Single_Lock
then
356 Result
:= pthread_mutex_lock
(T
.Common
.LL
.L
'Access);
357 pragma Assert
(Result
= 0);
366 (L
: not null access Lock
; Ceiling_Violation
: out Boolean) is
368 Write_Lock
(L
, Ceiling_Violation
);
375 procedure Unlock
(L
: not null access Lock
) is
376 Result
: Interfaces
.C
.int
;
378 Result
:= pthread_mutex_unlock
(L
);
379 pragma Assert
(Result
= 0);
383 (L
: not null access RTS_Lock
;
384 Global_Lock
: Boolean := False)
386 Result
: Interfaces
.C
.int
;
388 if not Single_Lock
or else Global_Lock
then
389 Result
:= pthread_mutex_unlock
(L
);
390 pragma Assert
(Result
= 0);
394 procedure Unlock
(T
: Task_Id
) is
395 Result
: Interfaces
.C
.int
;
397 if not Single_Lock
then
398 Result
:= pthread_mutex_unlock
(T
.Common
.LL
.L
'Access);
399 pragma Assert
(Result
= 0);
407 -- Dynamic priority ceilings are not supported by the underlying system
409 procedure Set_Ceiling
410 (L
: not null access Lock
;
411 Prio
: System
.Any_Priority
)
413 pragma Unreferenced
(L
, Prio
);
423 (Self_ID
: ST
.Task_Id
;
424 Reason
: System
.Tasking
.Task_States
)
426 pragma Unreferenced
(Reason
);
427 Result
: Interfaces
.C
.int
;
433 (Self_ID
.Common
.LL
.CV
'Access, Single_RTS_Lock
'Access);
437 (Self_ID
.Common
.LL
.CV
'Access, Self_ID
.Common
.LL
.L
'Access);
440 -- EINTR is not considered a failure
442 pragma Assert
(Result
= 0 or else Result
= EINTR
);
449 procedure Timed_Sleep
452 Mode
: ST
.Delay_Modes
;
453 Reason
: Task_States
;
454 Timedout
: out Boolean;
455 Yielded
: out Boolean)
457 pragma Unreferenced
(Reason
);
459 Base_Time
: constant Duration := Monotonic_Clock
;
460 Check_Time
: Duration := Base_Time
;
462 Request
: aliased timespec
;
463 Result
: Interfaces
.C
.int
;
469 if Mode
= Relative
then
470 Abs_Time
:= Duration'Min (Time
, Max_Sensible_Delay
) + Check_Time
;
472 Abs_Time
:= Duration'Min (Check_Time
+ Max_Sensible_Delay
, Time
);
475 if Abs_Time
> Check_Time
then
476 Request
:= To_Timespec
(Abs_Time
);
479 exit when Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
;
483 pthread_cond_timedwait
484 (Self_ID
.Common
.LL
.CV
'Access, Single_RTS_Lock
'Access,
489 pthread_cond_timedwait
490 (Self_ID
.Common
.LL
.CV
'Access, Self_ID
.Common
.LL
.L
'Access,
494 Check_Time
:= Monotonic_Clock
;
495 exit when Abs_Time
<= Check_Time
or else Check_Time
< Base_Time
;
497 if Result
= 0 or else errno
= EINTR
then
509 -- This is for use in implementing delay statements, so we assume
510 -- the caller is abort-deferred but is holding no locks.
512 procedure Timed_Delay
515 Mode
: ST
.Delay_Modes
)
517 Base_Time
: constant Duration := Monotonic_Clock
;
518 Check_Time
: Duration := Base_Time
;
520 Request
: aliased timespec
;
521 Result
: Interfaces
.C
.int
;
528 Write_Lock
(Self_ID
);
530 if Mode
= Relative
then
531 Abs_Time
:= Time
+ Check_Time
;
533 Abs_Time
:= Duration'Min (Check_Time
+ Max_Sensible_Delay
, Time
);
536 if Abs_Time
> Check_Time
then
537 Request
:= To_Timespec
(Abs_Time
);
538 Self_ID
.Common
.State
:= Delay_Sleep
;
541 exit when Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
;
544 Result
:= pthread_cond_timedwait
545 (Self_ID
.Common
.LL
.CV
'Access,
546 Single_RTS_Lock
'Access,
549 Result
:= pthread_cond_timedwait
550 (Self_ID
.Common
.LL
.CV
'Access,
551 Self_ID
.Common
.LL
.L
'Access,
555 Check_Time
:= Monotonic_Clock
;
556 exit when Abs_Time
<= Check_Time
or else Check_Time
< Base_Time
;
558 pragma Assert
(Result
= 0
559 or else Result
= ETIMEDOUT
560 or else Result
= EINTR
);
563 Self_ID
.Common
.State
:= Runnable
;
575 ---------------------
576 -- Monotonic_Clock --
577 ---------------------
579 function Monotonic_Clock
return Duration is
580 TS
: aliased timespec
;
581 Result
: Interfaces
.C
.int
;
583 Result
:= clock_gettime
(Real_Time_Clock_Id
, TS
'Unchecked_Access);
584 pragma Assert
(Result
= 0);
585 return To_Duration
(TS
);
592 function RT_Resolution
return Duration is
594 -- The clock_getres (Real_Time_Clock_Id) function appears to return
595 -- the interrupt resolution of the realtime clock and not the actual
596 -- resolution of reading the clock. Even though this last value is
597 -- only guaranteed to be 100 Hz, at least the Origin 200 appears to
598 -- have a microsecond resolution or better.
600 -- ??? We should figure out a method to return the right value on
610 procedure Wakeup
(T
: ST
.Task_Id
; Reason
: System
.Tasking
.Task_States
) is
611 pragma Unreferenced
(Reason
);
612 Result
: Interfaces
.C
.int
;
614 Result
:= pthread_cond_signal
(T
.Common
.LL
.CV
'Access);
615 pragma Assert
(Result
= 0);
622 procedure Yield
(Do_Yield
: Boolean := True) is
623 Result
: Interfaces
.C
.int
;
624 pragma Unreferenced
(Result
);
627 Result
:= sched_yield
;
635 procedure Set_Priority
637 Prio
: System
.Any_Priority
;
638 Loss_Of_Inheritance
: Boolean := False)
640 pragma Unreferenced
(Loss_Of_Inheritance
);
642 Result
: Interfaces
.C
.int
;
643 Param
: aliased struct_sched_param
;
644 Sched_Policy
: Interfaces
.C
.int
;
646 use type System
.Task_Info
.Task_Info_Type
;
648 function To_Int
is new Ada
.Unchecked_Conversion
649 (System
.Task_Info
.Thread_Scheduling_Policy
, Interfaces
.C
.int
);
651 function Get_Policy
(Prio
: System
.Any_Priority
) return Character;
652 pragma Import
(C
, Get_Policy
, "__gnat_get_specific_dispatching");
653 -- Get priority specific dispatching policy
655 Priority_Specific_Policy
: constant Character := Get_Policy
(Prio
);
656 -- Upper case first character of the policy name corresponding to the
657 -- task as set by a Priority_Specific_Dispatching pragma.
660 T
.Common
.Current_Priority
:= Prio
;
661 Param
.sched_priority
:= Interfaces
.C
.int
(Prio
);
663 if T
.Common
.Task_Info
/= null then
664 Sched_Policy
:= To_Int
(T
.Common
.Task_Info
.Policy
);
666 elsif Dispatching_Policy
= 'R'
667 or else Priority_Specific_Policy
= 'R'
668 or else Time_Slice_Val
> 0
670 Sched_Policy
:= SCHED_RR
;
673 Sched_Policy
:= SCHED_FIFO
;
676 Result
:= pthread_setschedparam
(T
.Common
.LL
.Thread
, Sched_Policy
,
678 pragma Assert
(Result
= 0);
685 function Get_Priority
(T
: Task_Id
) return System
.Any_Priority
is
687 return T
.Common
.Current_Priority
;
694 procedure Enter_Task
(Self_ID
: Task_Id
) is
695 Result
: Interfaces
.C
.int
;
697 function To_Int
is new Ada
.Unchecked_Conversion
698 (System
.Task_Info
.CPU_Number
, Interfaces
.C
.int
);
700 use System
.Task_Info
;
703 Self_ID
.Common
.LL
.Thread
:= pthread_self
;
704 Specific
.Set
(Self_ID
);
706 if Self_ID
.Common
.Task_Info
/= null
707 and then Self_ID
.Common
.Task_Info
.Scope
= PTHREAD_SCOPE_SYSTEM
708 and then Self_ID
.Common
.Task_Info
.Runon_CPU
/= ANY_CPU
710 Result
:= pthread_setrunon_np
711 (To_Int
(Self_ID
.Common
.Task_Info
.Runon_CPU
));
712 pragma Assert
(Result
= 0);
717 for J
in Known_Tasks
'Range loop
718 if Known_Tasks
(J
) = null then
719 Known_Tasks
(J
) := Self_ID
;
720 Self_ID
.Known_Tasks_Index
:= J
;
732 function New_ATCB
(Entry_Num
: Task_Entry_Index
) return Task_Id
is
734 return new Ada_Task_Control_Block
(Entry_Num
);
741 function Is_Valid_Task
return Boolean renames Specific
.Is_Valid_Task
;
743 -----------------------------
744 -- Register_Foreign_Thread --
745 -----------------------------
747 function Register_Foreign_Thread
return Task_Id
is
749 if Is_Valid_Task
then
752 return Register_Foreign_Thread
(pthread_self
);
754 end Register_Foreign_Thread
;
760 procedure Initialize_TCB
(Self_ID
: Task_Id
; Succeeded
: out Boolean) is
761 Result
: Interfaces
.C
.int
;
762 Cond_Attr
: aliased pthread_condattr_t
;
765 if not Single_Lock
then
766 Initialize_Lock
(Self_ID
.Common
.LL
.L
'Access, ATCB_Level
);
769 Result
:= pthread_condattr_init
(Cond_Attr
'Access);
770 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
774 pthread_cond_init
(Self_ID
.Common
.LL
.CV
'Access, Cond_Attr
'Access);
775 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
781 if not Single_Lock
then
782 Result
:= pthread_mutex_destroy
(Self_ID
.Common
.LL
.L
'Access);
783 pragma Assert
(Result
= 0);
789 Result
:= pthread_condattr_destroy
(Cond_Attr
'Access);
790 pragma Assert
(Result
= 0);
797 procedure Create_Task
799 Wrapper
: System
.Address
;
800 Stack_Size
: System
.Parameters
.Size_Type
;
801 Priority
: System
.Any_Priority
;
802 Succeeded
: out Boolean)
804 use System
.Task_Info
;
806 Attributes
: aliased pthread_attr_t
;
807 Sched_Param
: aliased struct_sched_param
;
808 Result
: Interfaces
.C
.int
;
810 function Thread_Body_Access
is new
811 Ada
.Unchecked_Conversion
(System
.Address
, Thread_Body
);
812 function To_Int
is new Ada
.Unchecked_Conversion
813 (System
.Task_Info
.Thread_Scheduling_Scope
, Interfaces
.C
.int
);
814 function To_Int
is new Ada
.Unchecked_Conversion
815 (System
.Task_Info
.Thread_Scheduling_Inheritance
, Interfaces
.C
.int
);
816 function To_Int
is new Ada
.Unchecked_Conversion
817 (System
.Task_Info
.Thread_Scheduling_Policy
, Interfaces
.C
.int
);
820 Result
:= pthread_attr_init
(Attributes
'Access);
821 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
829 pthread_attr_setdetachstate
830 (Attributes
'Access, PTHREAD_CREATE_DETACHED
);
831 pragma Assert
(Result
= 0);
834 pthread_attr_setstacksize
835 (Attributes
'Access, Interfaces
.C
.size_t
(Stack_Size
));
836 pragma Assert
(Result
= 0);
838 if T
.Common
.Task_Info
/= null then
840 pthread_attr_setscope
841 (Attributes
'Access, To_Int
(T
.Common
.Task_Info
.Scope
));
842 pragma Assert
(Result
= 0);
845 pthread_attr_setinheritsched
846 (Attributes
'Access, To_Int
(T
.Common
.Task_Info
.Inheritance
));
847 pragma Assert
(Result
= 0);
850 pthread_attr_setschedpolicy
851 (Attributes
'Access, To_Int
(T
.Common
.Task_Info
.Policy
));
852 pragma Assert
(Result
= 0);
854 Sched_Param
.sched_priority
:=
855 Interfaces
.C
.int
(T
.Common
.Task_Info
.Priority
);
858 pthread_attr_setschedparam
859 (Attributes
'Access, Sched_Param
'Access);
860 pragma Assert
(Result
= 0);
863 -- Since the initial signal mask of a thread is inherited from the
864 -- creator, and the Environment task has all its signals masked, we
865 -- do not need to manipulate caller's signal mask at this point.
866 -- All tasks in RTS will have All_Tasks_Mask initially.
870 (T
.Common
.LL
.Thread
'Access,
872 Thread_Body_Access
(Wrapper
),
876 and then T
.Common
.Task_Info
/= null
877 and then T
.Common
.Task_Info
.Scope
= PTHREAD_SCOPE_SYSTEM
879 -- The pthread_create call may have failed because we asked for a
880 -- system scope pthread and none were available (probably because
881 -- the program was not executed by the superuser). Let's try for
882 -- a process scope pthread instead of raising Tasking_Error.
885 ("Request for PTHREAD_SCOPE_SYSTEM in Task_Info pragma for task");
886 System
.IO
.Put
("""");
887 System
.IO
.Put
(T
.Common
.Task_Image
(1 .. T
.Common
.Task_Image_Len
));
888 System
.IO
.Put_Line
(""" could not be honored. ");
889 System
.IO
.Put_Line
("Scope changed to PTHREAD_SCOPE_PROCESS");
891 T
.Common
.Task_Info
.Scope
:= PTHREAD_SCOPE_PROCESS
;
893 pthread_attr_setscope
894 (Attributes
'Access, To_Int
(T
.Common
.Task_Info
.Scope
));
895 pragma Assert
(Result
= 0);
899 (T
.Common
.LL
.Thread
'Access,
901 Thread_Body_Access
(Wrapper
),
905 pragma Assert
(Result
= 0 or else Result
= EAGAIN
);
907 Succeeded
:= Result
= 0;
911 -- The following needs significant commenting ???
913 if T
.Common
.Task_Info
/= null then
914 T
.Common
.Base_Priority
:= T
.Common
.Task_Info
.Priority
;
915 Set_Priority
(T
, T
.Common
.Task_Info
.Priority
);
917 Set_Priority
(T
, Priority
);
921 Result
:= pthread_attr_destroy
(Attributes
'Access);
922 pragma Assert
(Result
= 0);
929 procedure Finalize_TCB
(T
: Task_Id
) is
930 Result
: Interfaces
.C
.int
;
932 Is_Self
: constant Boolean := T
= Self
;
934 procedure Free
is new
935 Ada
.Unchecked_Deallocation
(Ada_Task_Control_Block
, Task_Id
);
938 if not Single_Lock
then
939 Result
:= pthread_mutex_destroy
(T
.Common
.LL
.L
'Access);
940 pragma Assert
(Result
= 0);
943 Result
:= pthread_cond_destroy
(T
.Common
.LL
.CV
'Access);
944 pragma Assert
(Result
= 0);
946 if T
.Known_Tasks_Index
/= -1 then
947 Known_Tasks
(T
.Known_Tasks_Index
) := null;
961 procedure Exit_Task
is
970 procedure Abort_Task
(T
: Task_Id
) is
971 Result
: Interfaces
.C
.int
;
976 Signal
(System
.Interrupt_Management
.Abort_Task_Interrupt
));
977 pragma Assert
(Result
= 0);
984 procedure Initialize
(S
: in out Suspension_Object
) is
985 Mutex_Attr
: aliased pthread_mutexattr_t
;
986 Cond_Attr
: aliased pthread_condattr_t
;
987 Result
: Interfaces
.C
.int
;
990 -- Initialize internal state (always to False (RM D.10(6))
995 -- Initialize internal mutex
997 Result
:= pthread_mutexattr_init
(Mutex_Attr
'Access);
998 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
1000 if Result
= ENOMEM
then
1001 raise Storage_Error
;
1004 Result
:= pthread_mutex_init
(S
.L
'Access, Mutex_Attr
'Access);
1005 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
1007 if Result
= ENOMEM
then
1008 Result
:= pthread_mutexattr_destroy
(Mutex_Attr
'Access);
1009 pragma Assert
(Result
= 0);
1011 raise Storage_Error
;
1014 Result
:= pthread_mutexattr_destroy
(Mutex_Attr
'Access);
1015 pragma Assert
(Result
= 0);
1017 -- Initialize internal condition variable
1019 Result
:= pthread_condattr_init
(Cond_Attr
'Access);
1020 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
1023 Result
:= pthread_mutex_destroy
(S
.L
'Access);
1024 pragma Assert
(Result
= 0);
1026 if Result
= ENOMEM
then
1027 raise Storage_Error
;
1031 Result
:= pthread_cond_init
(S
.CV
'Access, Cond_Attr
'Access);
1032 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
1035 Result
:= pthread_mutex_destroy
(S
.L
'Access);
1036 pragma Assert
(Result
= 0);
1038 if Result
= ENOMEM
then
1039 Result
:= pthread_condattr_destroy
(Cond_Attr
'Access);
1040 pragma Assert
(Result
= 0);
1041 raise Storage_Error
;
1045 Result
:= pthread_condattr_destroy
(Cond_Attr
'Access);
1046 pragma Assert
(Result
= 0);
1053 procedure Finalize
(S
: in out Suspension_Object
) is
1054 Result
: Interfaces
.C
.int
;
1057 -- Destroy internal mutex
1059 Result
:= pthread_mutex_destroy
(S
.L
'Access);
1060 pragma Assert
(Result
= 0);
1062 -- Destroy internal condition variable
1064 Result
:= pthread_cond_destroy
(S
.CV
'Access);
1065 pragma Assert
(Result
= 0);
1072 function Current_State
(S
: Suspension_Object
) return Boolean is
1074 -- We do not want to use lock on this read operation. State is marked
1075 -- as Atomic so that we ensure that the value retrieved is correct.
1084 procedure Set_False
(S
: in out Suspension_Object
) is
1085 Result
: Interfaces
.C
.int
;
1088 SSL
.Abort_Defer
.all;
1090 Result
:= pthread_mutex_lock
(S
.L
'Access);
1091 pragma Assert
(Result
= 0);
1095 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1096 pragma Assert
(Result
= 0);
1098 SSL
.Abort_Undefer
.all;
1105 procedure Set_True
(S
: in out Suspension_Object
) is
1106 Result
: Interfaces
.C
.int
;
1109 SSL
.Abort_Defer
.all;
1111 Result
:= pthread_mutex_lock
(S
.L
'Access);
1112 pragma Assert
(Result
= 0);
1114 -- If there is already a task waiting on this suspension object then
1115 -- we resume it, leaving the state of the suspension object to False,
1116 -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves
1117 -- the state to True.
1123 Result
:= pthread_cond_signal
(S
.CV
'Access);
1124 pragma Assert
(Result
= 0);
1130 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1131 pragma Assert
(Result
= 0);
1133 SSL
.Abort_Undefer
.all;
1136 ------------------------
1137 -- Suspend_Until_True --
1138 ------------------------
1140 procedure Suspend_Until_True
(S
: in out Suspension_Object
) is
1141 Result
: Interfaces
.C
.int
;
1144 SSL
.Abort_Defer
.all;
1146 Result
:= pthread_mutex_lock
(S
.L
'Access);
1147 pragma Assert
(Result
= 0);
1151 -- Program_Error must be raised upon calling Suspend_Until_True
1152 -- if another task is already waiting on that suspension object
1155 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1156 pragma Assert
(Result
= 0);
1158 SSL
.Abort_Undefer
.all;
1160 raise Program_Error
;
1162 -- Suspend the task if the state is False. Otherwise, the task
1163 -- continues its execution, and the state of the suspension object
1164 -- is set to False (ARM D.10 par. 9).
1170 Result
:= pthread_cond_wait
(S
.CV
'Access, S
.L
'Access);
1173 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1174 pragma Assert
(Result
= 0);
1176 SSL
.Abort_Undefer
.all;
1178 end Suspend_Until_True
;
1186 function Check_Exit
(Self_ID
: ST
.Task_Id
) return Boolean is
1187 pragma Unreferenced
(Self_ID
);
1192 --------------------
1193 -- Check_No_Locks --
1194 --------------------
1196 function Check_No_Locks
(Self_ID
: ST
.Task_Id
) return Boolean is
1197 pragma Unreferenced
(Self_ID
);
1202 ----------------------
1203 -- Environment_Task --
1204 ----------------------
1206 function Environment_Task
return Task_Id
is
1208 return Environment_Task_Id
;
1209 end Environment_Task
;
1215 procedure Lock_RTS
is
1217 Write_Lock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
1224 procedure Unlock_RTS
is
1226 Unlock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
1233 function Suspend_Task
1235 Thread_Self
: Thread_Id
) return Boolean
1237 pragma Unreferenced
(T
);
1238 pragma Unreferenced
(Thread_Self
);
1247 function Resume_Task
1249 Thread_Self
: Thread_Id
) return Boolean
1251 pragma Unreferenced
(T
);
1252 pragma Unreferenced
(Thread_Self
);
1257 --------------------
1258 -- Stop_All_Tasks --
1259 --------------------
1261 procedure Stop_All_Tasks
is
1270 function Stop_Task
(T
: ST
.Task_Id
) return Boolean is
1271 pragma Unreferenced
(T
);
1280 function Continue_Task
(T
: ST
.Task_Id
) return Boolean is
1281 pragma Unreferenced
(T
);
1290 procedure Initialize
(Environment_Task
: Task_Id
) is
1291 act
: aliased struct_sigaction
;
1292 old_act
: aliased struct_sigaction
;
1293 Tmp_Set
: aliased sigset_t
;
1294 Result
: Interfaces
.C
.int
;
1297 (Int
: System
.Interrupt_Management
.Interrupt_ID
) return Character;
1298 pragma Import
(C
, State
, "__gnat_get_interrupt_state");
1299 -- Get interrupt state. Defined in a-init.c. The input argument is
1300 -- the interrupt number, and the result is one of the following:
1302 Default
: constant Character := 's';
1303 -- 'n' this interrupt not set by any Interrupt_State pragma
1304 -- 'u' Interrupt_State pragma set state to User
1305 -- 'r' Interrupt_State pragma set state to Runtime
1306 -- 's' Interrupt_State pragma set state to System (use "default"
1310 Environment_Task_Id
:= Environment_Task
;
1312 Interrupt_Management
.Initialize
;
1314 -- Initialize the lock used to synchronize chain of all ATCBs
1316 Initialize_Lock
(Single_RTS_Lock
'Access, RTS_Lock_Level
);
1318 Specific
.Initialize
(Environment_Task
);
1320 Enter_Task
(Environment_Task
);
1322 -- Prepare the set of signals that should unblocked in all tasks
1324 Result
:= sigemptyset
(Unblocked_Signal_Mask
'Access);
1325 pragma Assert
(Result
= 0);
1327 for J
in Interrupt_Management
.Interrupt_ID
loop
1328 if System
.Interrupt_Management
.Keep_Unmasked
(J
) then
1329 Result
:= sigaddset
(Unblocked_Signal_Mask
'Access, Signal
(J
));
1330 pragma Assert
(Result
= 0);
1334 -- Install the abort-signal handler
1337 (System
.Interrupt_Management
.Abort_Task_Interrupt
) /= Default
1340 act
.sa_handler
:= Abort_Handler
'Address;
1342 Result
:= sigemptyset
(Tmp_Set
'Access);
1343 pragma Assert
(Result
= 0);
1344 act
.sa_mask
:= Tmp_Set
;
1348 (Signal
(System
.Interrupt_Management
.Abort_Task_Interrupt
),
1349 act
'Unchecked_Access,
1350 old_act
'Unchecked_Access);
1351 pragma Assert
(Result
= 0);
1355 end System
.Task_Primitives
.Operations
;