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) 1992-2009, 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 3, or (at your option) any later ver- --
14 -- sion. GNAT 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. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNARL was developed by the GNARL team at Florida State University. --
28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
30 ------------------------------------------------------------------------------
32 -- This is a HP-UX DCE threads (HPUX 10) version of this package
34 -- This package contains all the GNULL primitives that interface directly with
38 -- Turn off polling, we do not want ATC polling to take place during tasking
39 -- operations. It causes infinite loops and other problems.
41 with Ada
.Unchecked_Conversion
;
42 with Ada
.Unchecked_Deallocation
;
46 with System
.Tasking
.Debug
;
47 with System
.Interrupt_Management
;
48 with System
.OS_Primitives
;
49 with System
.Task_Primitives
.Interrupt_Operations
;
51 pragma Warnings
(Off
);
52 with System
.Interrupt_Management
.Operations
;
53 pragma Elaborate_All
(System
.Interrupt_Management
.Operations
);
56 with System
.Soft_Links
;
57 -- We use System.Soft_Links instead of System.Tasking.Initialization
58 -- because the later is a higher level package that we shouldn't depend on.
59 -- For example when using the restricted run time, it is replaced by
60 -- System.Tasking.Restricted.Stages.
62 package body System
.Task_Primitives
.Operations
is
64 package SSL
renames System
.Soft_Links
;
66 use System
.Tasking
.Debug
;
69 use System
.OS_Interface
;
70 use System
.Parameters
;
71 use System
.OS_Primitives
;
73 package PIO
renames System
.Task_Primitives
.Interrupt_Operations
;
79 -- The followings are logically constants, but need to be initialized
82 Single_RTS_Lock
: aliased RTS_Lock
;
83 -- This is a lock to allow only one thread of control in the RTS at
84 -- a time; it is used to execute in mutual exclusion from all other tasks.
85 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
87 ATCB_Key
: aliased pthread_key_t
;
88 -- Key used to find the Ada Task_Id associated with a thread
90 Environment_Task_Id
: Task_Id
;
91 -- A variable to hold Task_Id for the environment task
93 Unblocked_Signal_Mask
: aliased sigset_t
;
94 -- The set of signals that should unblocked in all tasks
96 Time_Slice_Val
: Integer;
97 pragma Import
(C
, Time_Slice_Val
, "__gl_time_slice_val");
99 Dispatching_Policy
: Character;
100 pragma Import
(C
, Dispatching_Policy
, "__gl_task_dispatching_policy");
102 -- Note: the reason that Locking_Policy is not needed is that this
103 -- is not implemented for DCE threads. The HPUX 10 port is at this
104 -- stage considered dead, and no further work is planned on it.
106 Foreign_Task_Elaborated
: aliased Boolean := True;
107 -- Used to identified fake tasks (i.e., non-Ada Threads)
115 procedure Initialize
(Environment_Task
: Task_Id
);
116 pragma Inline
(Initialize
);
117 -- Initialize various data needed by this package
119 function Is_Valid_Task
return Boolean;
120 pragma Inline
(Is_Valid_Task
);
121 -- Does the executing thread have a TCB?
123 procedure Set
(Self_Id
: Task_Id
);
125 -- Set the self id for the current task
127 function Self
return Task_Id
;
128 pragma Inline
(Self
);
129 -- Return a pointer to the Ada Task Control Block of the calling task
133 package body Specific
is separate;
134 -- The body of this package is target specific
136 ---------------------------------
137 -- Support for foreign threads --
138 ---------------------------------
140 function Register_Foreign_Thread
(Thread
: Thread_Id
) return Task_Id
;
141 -- Allocate and Initialize a new ATCB for the current Thread
143 function Register_Foreign_Thread
144 (Thread
: Thread_Id
) return Task_Id
is separate;
146 -----------------------
147 -- Local Subprograms --
148 -----------------------
150 procedure Abort_Handler
(Sig
: Signal
);
152 function To_Address
is
153 new Ada
.Unchecked_Conversion
(Task_Id
, System
.Address
);
159 procedure Abort_Handler
(Sig
: Signal
) is
160 pragma Unreferenced
(Sig
);
162 Self_Id
: constant Task_Id
:= Self
;
163 Result
: Interfaces
.C
.int
;
164 Old_Set
: aliased sigset_t
;
167 if Self_Id
.Deferral_Level
= 0
168 and then Self_Id
.Pending_ATC_Level
< Self_Id
.ATC_Nesting_Level
169 and then not Self_Id
.Aborting
171 Self_Id
.Aborting
:= True;
173 -- Make sure signals used for RTS internal purpose are unmasked
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 bottom of a thread
191 -- stack, so nothing is needed.
192 -- ??? Check the comment above
194 procedure Stack_Guard
(T
: ST
.Task_Id
; On
: Boolean) is
195 pragma Unreferenced
(T
, On
);
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
242 Result
:= pthread_mutex_init
(L
.L
'Access, Attributes
'Access);
243 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
245 if Result
= ENOMEM
then
249 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
250 pragma Assert
(Result
= 0);
253 procedure Initialize_Lock
254 (L
: not null access RTS_Lock
;
257 pragma Unreferenced
(Level
);
259 Attributes
: aliased pthread_mutexattr_t
;
260 Result
: Interfaces
.C
.int
;
263 Result
:= pthread_mutexattr_init
(Attributes
'Access);
264 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
266 if Result
= ENOMEM
then
270 Result
:= pthread_mutex_init
(L
, Attributes
'Access);
272 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
274 if Result
= ENOMEM
then
278 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
279 pragma Assert
(Result
= 0);
286 procedure Finalize_Lock
(L
: not null access Lock
) is
287 Result
: Interfaces
.C
.int
;
289 Result
:= pthread_mutex_destroy
(L
.L
'Access);
290 pragma Assert
(Result
= 0);
293 procedure Finalize_Lock
(L
: not null access RTS_Lock
) is
294 Result
: Interfaces
.C
.int
;
296 Result
:= pthread_mutex_destroy
(L
);
297 pragma Assert
(Result
= 0);
305 (L
: not null access Lock
;
306 Ceiling_Violation
: out Boolean)
308 Result
: Interfaces
.C
.int
;
311 L
.Owner_Priority
:= Get_Priority
(Self
);
313 if L
.Priority
< L
.Owner_Priority
then
314 Ceiling_Violation
:= True;
318 Result
:= pthread_mutex_lock
(L
.L
'Access);
319 pragma Assert
(Result
= 0);
320 Ceiling_Violation
:= False;
324 (L
: not null access RTS_Lock
;
325 Global_Lock
: Boolean := False)
327 Result
: Interfaces
.C
.int
;
329 if not Single_Lock
or else Global_Lock
then
330 Result
:= pthread_mutex_lock
(L
);
331 pragma Assert
(Result
= 0);
335 procedure Write_Lock
(T
: Task_Id
) is
336 Result
: Interfaces
.C
.int
;
338 if not Single_Lock
then
339 Result
:= pthread_mutex_lock
(T
.Common
.LL
.L
'Access);
340 pragma Assert
(Result
= 0);
349 (L
: not null access Lock
;
350 Ceiling_Violation
: out Boolean)
353 Write_Lock
(L
, Ceiling_Violation
);
360 procedure Unlock
(L
: not null access Lock
) is
361 Result
: Interfaces
.C
.int
;
363 Result
:= pthread_mutex_unlock
(L
.L
'Access);
364 pragma Assert
(Result
= 0);
368 (L
: not null access RTS_Lock
;
369 Global_Lock
: Boolean := False)
371 Result
: Interfaces
.C
.int
;
373 if not Single_Lock
or else Global_Lock
then
374 Result
:= pthread_mutex_unlock
(L
);
375 pragma Assert
(Result
= 0);
379 procedure Unlock
(T
: Task_Id
) is
380 Result
: Interfaces
.C
.int
;
382 if not Single_Lock
then
383 Result
:= pthread_mutex_unlock
(T
.Common
.LL
.L
'Access);
384 pragma Assert
(Result
= 0);
392 -- Dynamic priority ceilings are not supported by the underlying system
394 procedure Set_Ceiling
395 (L
: not null access Lock
;
396 Prio
: System
.Any_Priority
)
398 pragma Unreferenced
(L
, Prio
);
409 Reason
: System
.Tasking
.Task_States
)
411 pragma Unreferenced
(Reason
);
413 Result
: Interfaces
.C
.int
;
418 (cond
=> Self_ID
.Common
.LL
.CV
'Access,
419 mutex
=> (if Single_Lock
420 then Single_RTS_Lock
'Access
421 else Self_ID
.Common
.LL
.L
'Access));
423 -- EINTR is not considered a failure
425 pragma Assert
(Result
= 0 or else Result
= EINTR
);
432 procedure Timed_Sleep
435 Mode
: ST
.Delay_Modes
;
436 Reason
: System
.Tasking
.Task_States
;
437 Timedout
: out Boolean;
438 Yielded
: out Boolean)
440 pragma Unreferenced
(Reason
);
442 Check_Time
: constant Duration := Monotonic_Clock
;
444 Request
: aliased timespec
;
445 Result
: Interfaces
.C
.int
;
453 then Duration'Min (Time
, Max_Sensible_Delay
) + Check_Time
454 else Duration'Min (Check_Time
+ Max_Sensible_Delay
, Time
));
456 if Abs_Time
> Check_Time
then
457 Request
:= To_Timespec
(Abs_Time
);
460 exit when Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
;
463 pthread_cond_timedwait
464 (cond
=> Self_ID
.Common
.LL
.CV
'Access,
465 mutex
=> (if Single_Lock
466 then Single_RTS_Lock
'Access
467 else Self_ID
.Common
.LL
.L
'Access),
468 abstime
=> Request
'Access);
470 exit when Abs_Time
<= Monotonic_Clock
;
472 if Result
= 0 or Result
= EINTR
then
474 -- Somebody may have called Wakeup for us
480 pragma Assert
(Result
= ETIMEDOUT
);
489 procedure Timed_Delay
492 Mode
: ST
.Delay_Modes
)
494 Check_Time
: constant Duration := Monotonic_Clock
;
496 Request
: aliased timespec
;
498 Result
: Interfaces
.C
.int
;
499 pragma Warnings
(Off
, Result
);
506 Write_Lock
(Self_ID
);
510 then Time
+ Check_Time
511 else Duration'Min (Check_Time
+ Max_Sensible_Delay
, Time
));
513 if Abs_Time
> Check_Time
then
514 Request
:= To_Timespec
(Abs_Time
);
515 Self_ID
.Common
.State
:= Delay_Sleep
;
518 exit when Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
;
521 pthread_cond_timedwait
522 (cond
=> Self_ID
.Common
.LL
.CV
'Access,
523 mutex
=> (if Single_Lock
524 then Single_RTS_Lock
'Access
525 else Self_ID
.Common
.LL
.L
'Access),
526 abstime
=> Request
'Access);
528 exit when Abs_Time
<= Monotonic_Clock
;
530 pragma Assert
(Result
= 0 or else
531 Result
= ETIMEDOUT
or else
535 Self_ID
.Common
.State
:= Runnable
;
544 Result
:= sched_yield
;
547 ---------------------
548 -- Monotonic_Clock --
549 ---------------------
551 function Monotonic_Clock
return Duration is
552 TS
: aliased timespec
;
553 Result
: Interfaces
.C
.int
;
555 Result
:= Clock_Gettime
(CLOCK_REALTIME
, TS
'Unchecked_Access);
556 pragma Assert
(Result
= 0);
557 return To_Duration
(TS
);
564 function RT_Resolution
return Duration is
573 procedure Wakeup
(T
: Task_Id
; Reason
: System
.Tasking
.Task_States
) is
574 pragma Unreferenced
(Reason
);
575 Result
: Interfaces
.C
.int
;
577 Result
:= pthread_cond_signal
(T
.Common
.LL
.CV
'Access);
578 pragma Assert
(Result
= 0);
585 procedure Yield
(Do_Yield
: Boolean := True) is
586 Result
: Interfaces
.C
.int
;
587 pragma Unreferenced
(Result
);
590 Result
:= sched_yield
;
598 type Prio_Array_Type
is array (System
.Any_Priority
) of Integer;
599 pragma Atomic_Components
(Prio_Array_Type
);
601 Prio_Array
: Prio_Array_Type
;
602 -- Global array containing the id of the currently running task for
605 -- Note: assume we are on single processor with run-til-blocked scheduling
607 procedure Set_Priority
609 Prio
: System
.Any_Priority
;
610 Loss_Of_Inheritance
: Boolean := False)
612 Result
: Interfaces
.C
.int
;
613 Array_Item
: Integer;
614 Param
: aliased struct_sched_param
;
616 function Get_Policy
(Prio
: System
.Any_Priority
) return Character;
617 pragma Import
(C
, Get_Policy
, "__gnat_get_specific_dispatching");
618 -- Get priority specific dispatching policy
620 Priority_Specific_Policy
: constant Character := Get_Policy
(Prio
);
621 -- Upper case first character of the policy name corresponding to the
622 -- task as set by a Priority_Specific_Dispatching pragma.
625 Param
.sched_priority
:= Interfaces
.C
.int
(Underlying_Priorities
(Prio
));
627 if Dispatching_Policy
= 'R'
628 or else Priority_Specific_Policy
= 'R'
629 or else Time_Slice_Val
> 0
632 pthread_setschedparam
633 (T
.Common
.LL
.Thread
, SCHED_RR
, Param
'Access);
635 elsif Dispatching_Policy
= 'F'
636 or else Priority_Specific_Policy
= 'F'
637 or else Time_Slice_Val
= 0
640 pthread_setschedparam
641 (T
.Common
.LL
.Thread
, SCHED_FIFO
, Param
'Access);
645 pthread_setschedparam
646 (T
.Common
.LL
.Thread
, SCHED_OTHER
, Param
'Access);
649 pragma Assert
(Result
= 0);
651 if Dispatching_Policy
= 'F' or else Priority_Specific_Policy
= 'F' then
653 -- Annex D requirement [RM D.2.2 par. 9]:
654 -- If the task drops its priority due to the loss of inherited
655 -- priority, it is added at the head of the ready queue for its
656 -- new active priority.
658 if Loss_Of_Inheritance
659 and then Prio
< T
.Common
.Current_Priority
661 Array_Item
:= Prio_Array
(T
.Common
.Base_Priority
) + 1;
662 Prio_Array
(T
.Common
.Base_Priority
) := Array_Item
;
665 -- Let some processes a chance to arrive
669 -- Then wait for our turn to proceed
671 exit when Array_Item
= Prio_Array
(T
.Common
.Base_Priority
)
672 or else Prio_Array
(T
.Common
.Base_Priority
) = 1;
675 Prio_Array
(T
.Common
.Base_Priority
) :=
676 Prio_Array
(T
.Common
.Base_Priority
) - 1;
680 T
.Common
.Current_Priority
:= Prio
;
687 function Get_Priority
(T
: Task_Id
) return System
.Any_Priority
is
689 return T
.Common
.Current_Priority
;
696 procedure Enter_Task
(Self_ID
: Task_Id
) is
698 Self_ID
.Common
.LL
.Thread
:= pthread_self
;
699 Specific
.Set
(Self_ID
);
706 function New_ATCB
(Entry_Num
: Task_Entry_Index
) return Task_Id
is
708 return new Ada_Task_Control_Block
(Entry_Num
);
715 function Is_Valid_Task
return Boolean renames Specific
.Is_Valid_Task
;
717 -----------------------------
718 -- Register_Foreign_Thread --
719 -----------------------------
721 function Register_Foreign_Thread
return Task_Id
is
723 if Is_Valid_Task
then
726 return Register_Foreign_Thread
(pthread_self
);
728 end Register_Foreign_Thread
;
734 procedure Initialize_TCB
(Self_ID
: Task_Id
; Succeeded
: out Boolean) is
735 Mutex_Attr
: aliased pthread_mutexattr_t
;
736 Result
: Interfaces
.C
.int
;
737 Cond_Attr
: aliased pthread_condattr_t
;
740 if not Single_Lock
then
741 Result
:= pthread_mutexattr_init
(Mutex_Attr
'Access);
742 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
747 (Self_ID
.Common
.LL
.L
'Access, Mutex_Attr
'Access);
748 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
756 Result
:= pthread_mutexattr_destroy
(Mutex_Attr
'Access);
757 pragma Assert
(Result
= 0);
760 Result
:= pthread_condattr_init
(Cond_Attr
'Access);
761 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
766 (Self_ID
.Common
.LL
.CV
'Access,
768 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
774 if not Single_Lock
then
775 Result
:= pthread_mutex_destroy
(Self_ID
.Common
.LL
.L
'Access);
776 pragma Assert
(Result
= 0);
782 Result
:= pthread_condattr_destroy
(Cond_Attr
'Access);
783 pragma Assert
(Result
= 0);
790 procedure Create_Task
792 Wrapper
: System
.Address
;
793 Stack_Size
: System
.Parameters
.Size_Type
;
794 Priority
: System
.Any_Priority
;
795 Succeeded
: out Boolean)
797 Attributes
: aliased pthread_attr_t
;
798 Result
: Interfaces
.C
.int
;
800 function Thread_Body_Access
is new
801 Ada
.Unchecked_Conversion
(System
.Address
, Thread_Body
);
804 Result
:= pthread_attr_init
(Attributes
'Access);
805 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
812 Result
:= pthread_attr_setstacksize
813 (Attributes
'Access, Interfaces
.C
.size_t
(Stack_Size
));
814 pragma Assert
(Result
= 0);
816 -- Since the initial signal mask of a thread is inherited from the
817 -- creator, and the Environment task has all its signals masked, we
818 -- do not need to manipulate caller's signal mask at this point.
819 -- All tasks in RTS will have All_Tasks_Mask initially.
821 Result
:= pthread_create
822 (T
.Common
.LL
.Thread
'Access,
824 Thread_Body_Access
(Wrapper
),
826 pragma Assert
(Result
= 0 or else Result
= EAGAIN
);
828 Succeeded
:= Result
= 0;
830 pthread_detach
(T
.Common
.LL
.Thread
'Access);
831 -- Detach the thread using pthread_detach, since DCE threads do not have
832 -- pthread_attr_set_detachstate.
834 Result
:= pthread_attr_destroy
(Attributes
'Access);
835 pragma Assert
(Result
= 0);
837 Set_Priority
(T
, Priority
);
844 procedure Finalize_TCB
(T
: Task_Id
) is
845 Result
: Interfaces
.C
.int
;
847 Is_Self
: constant Boolean := T
= Self
;
849 procedure Free
is new
850 Ada
.Unchecked_Deallocation
(Ada_Task_Control_Block
, Task_Id
);
853 if not Single_Lock
then
854 Result
:= pthread_mutex_destroy
(T
.Common
.LL
.L
'Access);
855 pragma Assert
(Result
= 0);
858 Result
:= pthread_cond_destroy
(T
.Common
.LL
.CV
'Access);
859 pragma Assert
(Result
= 0);
861 if T
.Known_Tasks_Index
/= -1 then
862 Known_Tasks
(T
.Known_Tasks_Index
) := null;
876 procedure Exit_Task
is
885 procedure Abort_Task
(T
: Task_Id
) is
887 -- Interrupt Server_Tasks may be waiting on an "event" flag (signal)
889 if T
.Common
.State
= Interrupt_Server_Blocked_On_Event_Flag
then
890 System
.Interrupt_Management
.Operations
.Interrupt_Self_Process
891 (System
.Interrupt_Management
.Interrupt_ID
892 (PIO
.Get_Interrupt_ID
(T
)));
900 procedure Initialize
(S
: in out Suspension_Object
) is
901 Mutex_Attr
: aliased pthread_mutexattr_t
;
902 Cond_Attr
: aliased pthread_condattr_t
;
903 Result
: Interfaces
.C
.int
;
905 -- Initialize internal state (always to False (ARM D.10(6)))
910 -- Initialize internal mutex
912 Result
:= pthread_mutex_init
(S
.L
'Access, Mutex_Attr
'Access);
913 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
915 if Result
= ENOMEM
then
919 -- Initialize internal condition variable
921 Result
:= pthread_cond_init
(S
.CV
'Access, Cond_Attr
'Access);
922 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
925 Result
:= pthread_mutex_destroy
(S
.L
'Access);
926 pragma Assert
(Result
= 0);
928 if Result
= ENOMEM
then
938 procedure Finalize
(S
: in out Suspension_Object
) is
939 Result
: Interfaces
.C
.int
;
942 -- Destroy internal mutex
944 Result
:= pthread_mutex_destroy
(S
.L
'Access);
945 pragma Assert
(Result
= 0);
947 -- Destroy internal condition variable
949 Result
:= pthread_cond_destroy
(S
.CV
'Access);
950 pragma Assert
(Result
= 0);
957 function Current_State
(S
: Suspension_Object
) return Boolean is
959 -- We do not want to use lock on this read operation. State is marked
960 -- as Atomic so that we ensure that the value retrieved is correct.
969 procedure Set_False
(S
: in out Suspension_Object
) is
970 Result
: Interfaces
.C
.int
;
975 Result
:= pthread_mutex_lock
(S
.L
'Access);
976 pragma Assert
(Result
= 0);
980 Result
:= pthread_mutex_unlock
(S
.L
'Access);
981 pragma Assert
(Result
= 0);
983 SSL
.Abort_Undefer
.all;
990 procedure Set_True
(S
: in out Suspension_Object
) is
991 Result
: Interfaces
.C
.int
;
996 Result
:= pthread_mutex_lock
(S
.L
'Access);
997 pragma Assert
(Result
= 0);
999 -- If there is already a task waiting on this suspension object then
1000 -- we resume it, leaving the state of the suspension object to False,
1001 -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves
1002 -- the state to True.
1008 Result
:= pthread_cond_signal
(S
.CV
'Access);
1009 pragma Assert
(Result
= 0);
1015 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1016 pragma Assert
(Result
= 0);
1018 SSL
.Abort_Undefer
.all;
1021 ------------------------
1022 -- Suspend_Until_True --
1023 ------------------------
1025 procedure Suspend_Until_True
(S
: in out Suspension_Object
) is
1026 Result
: Interfaces
.C
.int
;
1029 SSL
.Abort_Defer
.all;
1031 Result
:= pthread_mutex_lock
(S
.L
'Access);
1032 pragma Assert
(Result
= 0);
1035 -- Program_Error must be raised upon calling Suspend_Until_True
1036 -- if another task is already waiting on that suspension object
1037 -- (ARM D.10 par. 10).
1039 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1040 pragma Assert
(Result
= 0);
1042 SSL
.Abort_Undefer
.all;
1044 raise Program_Error
;
1046 -- Suspend the task if the state is False. Otherwise, the task
1047 -- continues its execution, and the state of the suspension object
1048 -- is set to False (ARM D.10 par. 9).
1056 -- Loop in case pthread_cond_wait returns earlier than expected
1057 -- (e.g. in case of EINTR caused by a signal).
1059 Result
:= pthread_cond_wait
(S
.CV
'Access, S
.L
'Access);
1060 pragma Assert
(Result
= 0 or else Result
= EINTR
);
1062 exit when not S
.Waiting
;
1066 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1067 pragma Assert
(Result
= 0);
1069 SSL
.Abort_Undefer
.all;
1071 end Suspend_Until_True
;
1079 function Check_Exit
(Self_ID
: ST
.Task_Id
) return Boolean is
1080 pragma Unreferenced
(Self_ID
);
1085 --------------------
1086 -- Check_No_Locks --
1087 --------------------
1089 function Check_No_Locks
(Self_ID
: ST
.Task_Id
) return Boolean is
1090 pragma Unreferenced
(Self_ID
);
1095 ----------------------
1096 -- Environment_Task --
1097 ----------------------
1099 function Environment_Task
return Task_Id
is
1101 return Environment_Task_Id
;
1102 end Environment_Task
;
1108 procedure Lock_RTS
is
1110 Write_Lock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
1117 procedure Unlock_RTS
is
1119 Unlock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
1126 function Suspend_Task
1128 Thread_Self
: Thread_Id
) return Boolean
1130 pragma Unreferenced
(T
);
1131 pragma Unreferenced
(Thread_Self
);
1140 function Resume_Task
1142 Thread_Self
: Thread_Id
) return Boolean
1144 pragma Unreferenced
(T
);
1145 pragma Unreferenced
(Thread_Self
);
1150 --------------------
1151 -- Stop_All_Tasks --
1152 --------------------
1154 procedure Stop_All_Tasks
is
1163 function Stop_Task
(T
: ST
.Task_Id
) return Boolean is
1164 pragma Unreferenced
(T
);
1173 function Continue_Task
(T
: ST
.Task_Id
) return Boolean is
1174 pragma Unreferenced
(T
);
1183 procedure Initialize
(Environment_Task
: Task_Id
) is
1184 act
: aliased struct_sigaction
;
1185 old_act
: aliased struct_sigaction
;
1186 Tmp_Set
: aliased sigset_t
;
1187 Result
: Interfaces
.C
.int
;
1190 (Int
: System
.Interrupt_Management
.Interrupt_ID
) return Character;
1191 pragma Import
(C
, State
, "__gnat_get_interrupt_state");
1192 -- Get interrupt state. Defined in a-init.c. The input argument is
1193 -- the interrupt number, and the result is one of the following:
1195 Default
: constant Character := 's';
1196 -- 'n' this interrupt not set by any Interrupt_State pragma
1197 -- 'u' Interrupt_State pragma set state to User
1198 -- 'r' Interrupt_State pragma set state to Runtime
1199 -- 's' Interrupt_State pragma set state to System (use "default"
1203 Environment_Task_Id
:= Environment_Task
;
1205 Interrupt_Management
.Initialize
;
1207 -- Initialize the lock used to synchronize chain of all ATCBs
1209 Initialize_Lock
(Single_RTS_Lock
'Access, RTS_Lock_Level
);
1211 Specific
.Initialize
(Environment_Task
);
1213 -- Make environment task known here because it doesn't go through
1214 -- Activate_Tasks, which does it for all other tasks.
1216 Known_Tasks
(Known_Tasks
'First) := Environment_Task
;
1217 Environment_Task
.Known_Tasks_Index
:= Known_Tasks
'First;
1219 Enter_Task
(Environment_Task
);
1221 -- Install the abort-signal handler
1223 if State
(System
.Interrupt_Management
.Abort_Task_Interrupt
)
1227 act
.sa_handler
:= Abort_Handler
'Address;
1229 Result
:= sigemptyset
(Tmp_Set
'Access);
1230 pragma Assert
(Result
= 0);
1231 act
.sa_mask
:= Tmp_Set
;
1235 Signal
(System
.Interrupt_Management
.Abort_Task_Interrupt
),
1236 act
'Unchecked_Access,
1237 old_act
'Unchecked_Access);
1238 pragma Assert
(Result
= 0);
1242 -- NOTE: Unlike other pthread implementations, we do *not* mask all
1243 -- signals here since we handle signals using the process-wide primitive
1244 -- signal, rather than using sigthreadmask and sigwait. The reason of
1245 -- this difference is that sigwait doesn't work when some critical
1246 -- signals (SIGABRT, SIGPIPE) are masked.
1248 end System
.Task_Primitives
.Operations
;