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) 1992-2005, 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 HP-UX DCE threads (HPUX 10) 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
46 with System
.Interrupt_Management
;
47 -- used for Keep_Unmasked
48 -- Abort_Task_Interrupt
51 pragma Warnings
(Off
);
52 with System
.Interrupt_Management
.Operations
;
53 -- used for Set_Interrupt_Mask
55 pragma Elaborate_All
(System
.Interrupt_Management
.Operations
);
59 with System
.OS_Primitives
;
60 -- used for Delay_Modes
66 with System
.Parameters
;
69 with System
.Task_Primitives
.Interrupt_Operations
;
70 -- used for Get_Interrupt_ID
72 with Unchecked_Conversion
;
73 with Unchecked_Deallocation
;
75 package body System
.Task_Primitives
.Operations
is
77 use System
.Tasking
.Debug
;
80 use System
.OS_Interface
;
81 use System
.Parameters
;
82 use System
.OS_Primitives
;
84 package PIO
renames System
.Task_Primitives
.Interrupt_Operations
;
90 -- The followings are logically constants, but need to be initialized
93 Single_RTS_Lock
: aliased RTS_Lock
;
94 -- This is a lock to allow only one thread of control in the RTS at
95 -- a time; it is used to execute in mutual exclusion from all other tasks.
96 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
98 ATCB_Key
: aliased pthread_key_t
;
99 -- Key used to find the Ada Task_Id associated with a thread
101 Environment_Task_Id
: Task_Id
;
102 -- A variable to hold Task_Id for the environment task
104 Unblocked_Signal_Mask
: aliased sigset_t
;
105 -- The set of signals that should unblocked in all tasks
107 Time_Slice_Val
: Integer;
108 pragma Import
(C
, Time_Slice_Val
, "__gl_time_slice_val");
110 Dispatching_Policy
: Character;
111 pragma Import
(C
, Dispatching_Policy
, "__gl_task_dispatching_policy");
113 -- Note: the reason that Locking_Policy is not needed is that this
114 -- is not implemented for DCE threads. The HPUX 10 port is at this
115 -- stage considered dead, and no further work is planned on it.
117 Foreign_Task_Elaborated
: aliased Boolean := True;
118 -- Used to identified fake tasks (i.e., non-Ada Threads)
126 procedure Initialize
(Environment_Task
: Task_Id
);
127 pragma Inline
(Initialize
);
128 -- Initialize various data needed by this package
130 function Is_Valid_Task
return Boolean;
131 pragma Inline
(Is_Valid_Task
);
132 -- Does the executing thread have a TCB?
134 procedure Set
(Self_Id
: Task_Id
);
136 -- Set the self id for the current task
138 function Self
return Task_Id
;
139 pragma Inline
(Self
);
140 -- Return a pointer to the Ada Task Control Block of the calling task
144 package body Specific
is separate;
145 -- The body of this package is target specific
147 ---------------------------------
148 -- Support for foreign threads --
149 ---------------------------------
151 function Register_Foreign_Thread
(Thread
: Thread_Id
) return Task_Id
;
152 -- Allocate and Initialize a new ATCB for the current Thread
154 function Register_Foreign_Thread
155 (Thread
: Thread_Id
) return Task_Id
is separate;
157 -----------------------
158 -- Local Subprograms --
159 -----------------------
161 procedure Abort_Handler
(Sig
: Signal
);
163 function To_Address
is new Unchecked_Conversion
(Task_Id
, System
.Address
);
169 procedure Abort_Handler
(Sig
: Signal
) is
170 pragma Unreferenced
(Sig
);
172 Self_Id
: constant Task_Id
:= Self
;
173 Result
: Interfaces
.C
.int
;
174 Old_Set
: aliased sigset_t
;
177 if Self_Id
.Deferral_Level
= 0
178 and then Self_Id
.Pending_ATC_Level
< Self_Id
.ATC_Nesting_Level
and then
181 Self_Id
.Aborting
:= True;
183 -- Make sure signals used for RTS internal purpose are unmasked
185 Result
:= pthread_sigmask
(SIG_UNBLOCK
,
186 Unblocked_Signal_Mask
'Unchecked_Access, Old_Set
'Unchecked_Access);
187 pragma Assert
(Result
= 0);
189 raise Standard
'Abort_Signal;
197 -- The underlying thread system sets a guard page at the
198 -- bottom of a thread stack, so nothing is needed.
199 -- ??? Check the comment above
201 procedure Stack_Guard
(T
: ST
.Task_Id
; On
: Boolean) is
202 pragma Unreferenced
(T
, On
);
211 function Get_Thread_Id
(T
: ST
.Task_Id
) return OSI
.Thread_Id
is
213 return T
.Common
.LL
.Thread
;
220 function Self
return Task_Id
renames Specific
.Self
;
222 ---------------------
223 -- Initialize_Lock --
224 ---------------------
226 -- Note: mutexes and cond_variables needed per-task basis are
227 -- initialized in Initialize_TCB and the Storage_Error is
228 -- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
229 -- used in RTS is initialized before any status change of RTS.
230 -- Therefore rasing Storage_Error in the following routines
231 -- should be able to be handled safely.
233 procedure Initialize_Lock
234 (Prio
: System
.Any_Priority
;
237 Attributes
: aliased pthread_mutexattr_t
;
238 Result
: Interfaces
.C
.int
;
241 Result
:= pthread_mutexattr_init
(Attributes
'Access);
242 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
244 if Result
= ENOMEM
then
250 Result
:= pthread_mutex_init
(L
.L
'Access, Attributes
'Access);
251 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
253 if Result
= ENOMEM
then
257 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
258 pragma Assert
(Result
= 0);
261 procedure Initialize_Lock
(L
: access RTS_Lock
; Level
: Lock_Level
) is
262 pragma Unreferenced
(Level
);
264 Attributes
: aliased pthread_mutexattr_t
;
265 Result
: Interfaces
.C
.int
;
268 Result
:= pthread_mutexattr_init
(Attributes
'Access);
269 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
271 if Result
= ENOMEM
then
275 Result
:= pthread_mutex_init
(L
, Attributes
'Access);
277 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
279 if Result
= ENOMEM
then
283 Result
:= pthread_mutexattr_destroy
(Attributes
'Access);
284 pragma Assert
(Result
= 0);
291 procedure Finalize_Lock
(L
: access Lock
) is
292 Result
: Interfaces
.C
.int
;
294 Result
:= pthread_mutex_destroy
(L
.L
'Access);
295 pragma Assert
(Result
= 0);
298 procedure Finalize_Lock
(L
: access RTS_Lock
) is
299 Result
: Interfaces
.C
.int
;
301 Result
:= pthread_mutex_destroy
(L
);
302 pragma Assert
(Result
= 0);
309 procedure Write_Lock
(L
: access Lock
; Ceiling_Violation
: out Boolean) is
310 Result
: Interfaces
.C
.int
;
313 L
.Owner_Priority
:= Get_Priority
(Self
);
315 if L
.Priority
< L
.Owner_Priority
then
316 Ceiling_Violation
:= True;
320 Result
:= pthread_mutex_lock
(L
.L
'Access);
321 pragma Assert
(Result
= 0);
322 Ceiling_Violation
:= False;
326 (L
: access RTS_Lock
; Global_Lock
: Boolean := False)
328 Result
: Interfaces
.C
.int
;
330 if not Single_Lock
or else Global_Lock
then
331 Result
:= pthread_mutex_lock
(L
);
332 pragma Assert
(Result
= 0);
336 procedure Write_Lock
(T
: Task_Id
) is
337 Result
: Interfaces
.C
.int
;
339 if not Single_Lock
then
340 Result
:= pthread_mutex_lock
(T
.Common
.LL
.L
'Access);
341 pragma Assert
(Result
= 0);
349 procedure Read_Lock
(L
: access Lock
; Ceiling_Violation
: out Boolean) is
351 Write_Lock
(L
, Ceiling_Violation
);
358 procedure Unlock
(L
: access Lock
) is
359 Result
: Interfaces
.C
.int
;
361 Result
:= pthread_mutex_unlock
(L
.L
'Access);
362 pragma Assert
(Result
= 0);
365 procedure Unlock
(L
: access RTS_Lock
; Global_Lock
: Boolean := False) is
366 Result
: Interfaces
.C
.int
;
368 if not Single_Lock
or else Global_Lock
then
369 Result
:= pthread_mutex_unlock
(L
);
370 pragma Assert
(Result
= 0);
374 procedure Unlock
(T
: Task_Id
) is
375 Result
: Interfaces
.C
.int
;
377 if not Single_Lock
then
378 Result
:= pthread_mutex_unlock
(T
.Common
.LL
.L
'Access);
379 pragma Assert
(Result
= 0);
389 Reason
: System
.Tasking
.Task_States
)
391 pragma Unreferenced
(Reason
);
393 Result
: Interfaces
.C
.int
;
396 Result
:= pthread_cond_wait
397 (Self_ID
.Common
.LL
.CV
'Access, Single_RTS_Lock
'Access);
399 Result
:= pthread_cond_wait
400 (Self_ID
.Common
.LL
.CV
'Access, Self_ID
.Common
.LL
.L
'Access);
403 -- EINTR is not considered a failure
405 pragma Assert
(Result
= 0 or else Result
= EINTR
);
412 procedure Timed_Sleep
415 Mode
: ST
.Delay_Modes
;
416 Reason
: System
.Tasking
.Task_States
;
417 Timedout
: out Boolean;
418 Yielded
: out Boolean)
420 pragma Unreferenced
(Reason
);
422 Check_Time
: constant Duration := Monotonic_Clock
;
424 Request
: aliased timespec
;
425 Result
: Interfaces
.C
.int
;
431 if Mode
= Relative
then
432 Abs_Time
:= Duration'Min (Time
, Max_Sensible_Delay
) + Check_Time
;
434 Abs_Time
:= Duration'Min (Check_Time
+ Max_Sensible_Delay
, Time
);
437 if Abs_Time
> Check_Time
then
438 Request
:= To_Timespec
(Abs_Time
);
441 exit when Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
442 or else Self_ID
.Pending_Priority_Change
;
445 Result
:= pthread_cond_timedwait
446 (Self_ID
.Common
.LL
.CV
'Access, Single_RTS_Lock
'Access,
450 Result
:= pthread_cond_timedwait
451 (Self_ID
.Common
.LL
.CV
'Access, Self_ID
.Common
.LL
.L
'Access,
455 exit when Abs_Time
<= Monotonic_Clock
;
457 if Result
= 0 or Result
= EINTR
then
459 -- Somebody may have called Wakeup for us
465 pragma Assert
(Result
= ETIMEDOUT
);
474 procedure Timed_Delay
477 Mode
: ST
.Delay_Modes
)
479 Check_Time
: constant Duration := Monotonic_Clock
;
481 Request
: aliased timespec
;
482 Result
: Interfaces
.C
.int
;
489 Write_Lock
(Self_ID
);
491 if Mode
= Relative
then
492 Abs_Time
:= Time
+ Check_Time
;
494 Abs_Time
:= Duration'Min (Check_Time
+ Max_Sensible_Delay
, Time
);
497 if Abs_Time
> Check_Time
then
498 Request
:= To_Timespec
(Abs_Time
);
499 Self_ID
.Common
.State
:= Delay_Sleep
;
502 if Self_ID
.Pending_Priority_Change
then
503 Self_ID
.Pending_Priority_Change
:= False;
504 Self_ID
.Common
.Base_Priority
:= Self_ID
.New_Base_Priority
;
505 Set_Priority
(Self_ID
, Self_ID
.Common
.Base_Priority
);
508 exit when Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
;
511 Result
:= pthread_cond_timedwait
(Self_ID
.Common
.LL
.CV
'Access,
512 Single_RTS_Lock
'Access, Request
'Access);
514 Result
:= pthread_cond_timedwait
(Self_ID
.Common
.LL
.CV
'Access,
515 Self_ID
.Common
.LL
.L
'Access, Request
'Access);
518 exit when Abs_Time
<= Monotonic_Clock
;
520 pragma Assert
(Result
= 0 or else
521 Result
= ETIMEDOUT
or else
525 Self_ID
.Common
.State
:= Runnable
;
534 Result
:= sched_yield
;
537 ---------------------
538 -- Monotonic_Clock --
539 ---------------------
541 function Monotonic_Clock
return Duration is
542 TS
: aliased timespec
;
543 Result
: Interfaces
.C
.int
;
545 Result
:= Clock_Gettime
(CLOCK_REALTIME
, TS
'Unchecked_Access);
546 pragma Assert
(Result
= 0);
547 return To_Duration
(TS
);
554 function RT_Resolution
return Duration is
563 procedure Wakeup
(T
: Task_Id
; Reason
: System
.Tasking
.Task_States
) is
564 pragma Unreferenced
(Reason
);
566 Result
: Interfaces
.C
.int
;
569 Result
:= pthread_cond_signal
(T
.Common
.LL
.CV
'Access);
570 pragma Assert
(Result
= 0);
577 procedure Yield
(Do_Yield
: Boolean := True) is
578 Result
: Interfaces
.C
.int
;
579 pragma Unreferenced
(Result
);
582 Result
:= sched_yield
;
590 type Prio_Array_Type
is array (System
.Any_Priority
) of Integer;
591 pragma Atomic_Components
(Prio_Array_Type
);
593 Prio_Array
: Prio_Array_Type
;
594 -- Global array containing the id of the currently running task for
597 -- Note: we assume that we are on a single processor with run-til-blocked
600 procedure Set_Priority
602 Prio
: System
.Any_Priority
;
603 Loss_Of_Inheritance
: Boolean := False)
605 Result
: Interfaces
.C
.int
;
606 Array_Item
: Integer;
607 Param
: aliased struct_sched_param
;
610 Param
.sched_priority
:= Interfaces
.C
.int
(Underlying_Priorities
(Prio
));
612 if Time_Slice_Val
> 0 then
613 Result
:= pthread_setschedparam
614 (T
.Common
.LL
.Thread
, SCHED_RR
, Param
'Access);
616 elsif Dispatching_Policy
= 'F' or else Time_Slice_Val
= 0 then
617 Result
:= pthread_setschedparam
618 (T
.Common
.LL
.Thread
, SCHED_FIFO
, Param
'Access);
621 Result
:= pthread_setschedparam
622 (T
.Common
.LL
.Thread
, SCHED_OTHER
, Param
'Access);
625 pragma Assert
(Result
= 0);
627 if Dispatching_Policy
= 'F' then
629 -- Annex D requirement [RM D.2.2 par. 9]:
630 -- If the task drops its priority due to the loss of inherited
631 -- priority, it is added at the head of the ready queue for its
632 -- new active priority.
634 if Loss_Of_Inheritance
635 and then Prio
< T
.Common
.Current_Priority
637 Array_Item
:= Prio_Array
(T
.Common
.Base_Priority
) + 1;
638 Prio_Array
(T
.Common
.Base_Priority
) := Array_Item
;
641 -- Let some processes a chance to arrive
645 -- Then wait for our turn to proceed
647 exit when Array_Item
= Prio_Array
(T
.Common
.Base_Priority
)
648 or else Prio_Array
(T
.Common
.Base_Priority
) = 1;
651 Prio_Array
(T
.Common
.Base_Priority
) :=
652 Prio_Array
(T
.Common
.Base_Priority
) - 1;
656 T
.Common
.Current_Priority
:= Prio
;
663 function Get_Priority
(T
: Task_Id
) return System
.Any_Priority
is
665 return T
.Common
.Current_Priority
;
672 procedure Enter_Task
(Self_ID
: Task_Id
) is
674 Self_ID
.Common
.LL
.Thread
:= pthread_self
;
675 Specific
.Set
(Self_ID
);
679 for J
in Known_Tasks
'Range loop
680 if Known_Tasks
(J
) = null then
681 Known_Tasks
(J
) := Self_ID
;
682 Self_ID
.Known_Tasks_Index
:= J
;
694 function New_ATCB
(Entry_Num
: Task_Entry_Index
) return Task_Id
is
696 return new Ada_Task_Control_Block
(Entry_Num
);
703 function Is_Valid_Task
return Boolean renames Specific
.Is_Valid_Task
;
705 -----------------------------
706 -- Register_Foreign_Thread --
707 -----------------------------
709 function Register_Foreign_Thread
return Task_Id
is
711 if Is_Valid_Task
then
714 return Register_Foreign_Thread
(pthread_self
);
716 end Register_Foreign_Thread
;
722 procedure Initialize_TCB
(Self_ID
: Task_Id
; Succeeded
: out Boolean) is
723 Mutex_Attr
: aliased pthread_mutexattr_t
;
724 Result
: Interfaces
.C
.int
;
725 Cond_Attr
: aliased pthread_condattr_t
;
728 if not Single_Lock
then
729 Result
:= pthread_mutexattr_init
(Mutex_Attr
'Access);
730 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
733 Result
:= pthread_mutex_init
(Self_ID
.Common
.LL
.L
'Access,
735 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
743 Result
:= pthread_mutexattr_destroy
(Mutex_Attr
'Access);
744 pragma Assert
(Result
= 0);
747 Result
:= pthread_condattr_init
(Cond_Attr
'Access);
748 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
751 Result
:= pthread_cond_init
(Self_ID
.Common
.LL
.CV
'Access,
753 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
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 Result
:= pthread_attr_init
(Attributes
'Access);
801 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
808 Result
:= pthread_attr_setstacksize
809 (Attributes
'Access, Adjusted_Stack_Size
);
810 pragma Assert
(Result
= 0);
812 -- Since the initial signal mask of a thread is inherited from the
813 -- creator, and the Environment task has all its signals masked, we
814 -- do not need to manipulate caller's signal mask at this point.
815 -- All tasks in RTS will have All_Tasks_Mask initially.
817 Result
:= pthread_create
818 (T
.Common
.LL
.Thread
'Access,
820 Thread_Body_Access
(Wrapper
),
822 pragma Assert
(Result
= 0 or else Result
= EAGAIN
);
824 Succeeded
:= Result
= 0;
826 pthread_detach
(T
.Common
.LL
.Thread
'Access);
827 -- Detach the thread using pthread_detach, sinc DCE threads do not have
828 -- pthread_attr_set_detachstate.
830 Result
:= pthread_attr_destroy
(Attributes
'Access);
831 pragma Assert
(Result
= 0);
833 Set_Priority
(T
, Priority
);
840 procedure Finalize_TCB
(T
: Task_Id
) is
841 Result
: Interfaces
.C
.int
;
843 Is_Self
: constant Boolean := T
= Self
;
845 procedure Free
is new
846 Unchecked_Deallocation
(Ada_Task_Control_Block
, Task_Id
);
849 if not Single_Lock
then
850 Result
:= pthread_mutex_destroy
(T
.Common
.LL
.L
'Access);
851 pragma Assert
(Result
= 0);
854 Result
:= pthread_cond_destroy
(T
.Common
.LL
.CV
'Access);
855 pragma Assert
(Result
= 0);
857 if T
.Known_Tasks_Index
/= -1 then
858 Known_Tasks
(T
.Known_Tasks_Index
) := null;
872 procedure Exit_Task
is
881 procedure Abort_Task
(T
: Task_Id
) is
884 -- Interrupt Server_Tasks may be waiting on an "event" flag (signal)
886 if T
.Common
.State
= Interrupt_Server_Blocked_On_Event_Flag
then
887 System
.Interrupt_Management
.Operations
.Interrupt_Self_Process
888 (System
.Interrupt_Management
.Interrupt_ID
889 (PIO
.Get_Interrupt_ID
(T
)));
897 procedure Initialize
(S
: in out Suspension_Object
) is
898 Mutex_Attr
: aliased pthread_mutexattr_t
;
899 Cond_Attr
: aliased pthread_condattr_t
;
900 Result
: Interfaces
.C
.int
;
902 -- Initialize internal state. It is always initialized to False (ARM
908 -- Initialize internal mutex
910 Result
:= pthread_mutex_init
(S
.L
'Access, Mutex_Attr
'Access);
911 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
913 if Result
= ENOMEM
then
917 -- Initialize internal condition variable
919 Result
:= pthread_cond_init
(S
.CV
'Access, Cond_Attr
'Access);
920 pragma Assert
(Result
= 0 or else Result
= ENOMEM
);
923 Result
:= pthread_mutex_destroy
(S
.L
'Access);
924 pragma Assert
(Result
= 0);
926 if Result
= ENOMEM
then
936 procedure Finalize
(S
: in out Suspension_Object
) is
937 Result
: Interfaces
.C
.int
;
939 -- Destroy internal mutex
941 Result
:= pthread_mutex_destroy
(S
.L
'Access);
942 pragma Assert
(Result
= 0);
944 -- Destroy internal condition variable
946 Result
:= pthread_cond_destroy
(S
.CV
'Access);
947 pragma Assert
(Result
= 0);
954 function Current_State
(S
: Suspension_Object
) return Boolean is
956 -- We do not want to use lock on this read operation. State is marked
957 -- as Atomic so that we ensure that the value retrieved is correct.
966 procedure Set_False
(S
: in out Suspension_Object
) is
967 Result
: Interfaces
.C
.int
;
969 Result
:= pthread_mutex_lock
(S
.L
'Access);
970 pragma Assert
(Result
= 0);
974 Result
:= pthread_mutex_unlock
(S
.L
'Access);
975 pragma Assert
(Result
= 0);
982 procedure Set_True
(S
: in out Suspension_Object
) is
983 Result
: Interfaces
.C
.int
;
985 Result
:= pthread_mutex_lock
(S
.L
'Access);
986 pragma Assert
(Result
= 0);
988 -- If there is already a task waiting on this suspension object then
989 -- we resume it, leaving the state of the suspension object to False,
990 -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves
991 -- the state to True.
997 Result
:= pthread_cond_signal
(S
.CV
'Access);
998 pragma Assert
(Result
= 0);
1003 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1004 pragma Assert
(Result
= 0);
1007 ------------------------
1008 -- Suspend_Until_True --
1009 ------------------------
1011 procedure Suspend_Until_True
(S
: in out Suspension_Object
) is
1012 Result
: Interfaces
.C
.int
;
1014 Result
:= pthread_mutex_lock
(S
.L
'Access);
1015 pragma Assert
(Result
= 0);
1018 -- Program_Error must be raised upon calling Suspend_Until_True
1019 -- if another task is already waiting on that suspension object
1020 -- (ARM D.10 par. 10).
1022 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1023 pragma Assert
(Result
= 0);
1025 raise Program_Error
;
1027 -- Suspend the task if the state is False. Otherwise, the task
1028 -- continues its execution, and the state of the suspension object
1029 -- is set to False (ARM D.10 par. 9).
1035 Result
:= pthread_cond_wait
(S
.CV
'Access, S
.L
'Access);
1039 Result
:= pthread_mutex_unlock
(S
.L
'Access);
1040 pragma Assert
(Result
= 0);
1041 end Suspend_Until_True
;
1049 function Check_Exit
(Self_ID
: ST
.Task_Id
) return Boolean is
1050 pragma Unreferenced
(Self_ID
);
1055 --------------------
1056 -- Check_No_Locks --
1057 --------------------
1059 function Check_No_Locks
(Self_ID
: ST
.Task_Id
) return Boolean is
1060 pragma Unreferenced
(Self_ID
);
1065 ----------------------
1066 -- Environment_Task --
1067 ----------------------
1069 function Environment_Task
return Task_Id
is
1071 return Environment_Task_Id
;
1072 end Environment_Task
;
1078 procedure Lock_RTS
is
1080 Write_Lock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
1087 procedure Unlock_RTS
is
1089 Unlock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
1096 function Suspend_Task
1098 Thread_Self
: Thread_Id
) return Boolean
1100 pragma Unreferenced
(T
);
1101 pragma Unreferenced
(Thread_Self
);
1110 function Resume_Task
1112 Thread_Self
: Thread_Id
) return Boolean
1114 pragma Unreferenced
(T
);
1115 pragma Unreferenced
(Thread_Self
);
1124 procedure Initialize
(Environment_Task
: Task_Id
) is
1125 act
: aliased struct_sigaction
;
1126 old_act
: aliased struct_sigaction
;
1127 Tmp_Set
: aliased sigset_t
;
1128 Result
: Interfaces
.C
.int
;
1131 (Int
: System
.Interrupt_Management
.Interrupt_ID
) return Character;
1132 pragma Import
(C
, State
, "__gnat_get_interrupt_state");
1133 -- Get interrupt state. Defined in a-init.c. The input argument is
1134 -- the interrupt number, and the result is one of the following:
1136 Default
: constant Character := 's';
1137 -- 'n' this interrupt not set by any Interrupt_State pragma
1138 -- 'u' Interrupt_State pragma set state to User
1139 -- 'r' Interrupt_State pragma set state to Runtime
1140 -- 's' Interrupt_State pragma set state to System (use "default"
1144 Environment_Task_Id
:= Environment_Task
;
1146 Interrupt_Management
.Initialize
;
1148 -- Initialize the lock used to synchronize chain of all ATCBs
1150 Initialize_Lock
(Single_RTS_Lock
'Access, RTS_Lock_Level
);
1152 Specific
.Initialize
(Environment_Task
);
1154 Enter_Task
(Environment_Task
);
1156 -- Install the abort-signal handler
1158 if State
(System
.Interrupt_Management
.Abort_Task_Interrupt
)
1162 act
.sa_handler
:= Abort_Handler
'Address;
1164 Result
:= sigemptyset
(Tmp_Set
'Access);
1165 pragma Assert
(Result
= 0);
1166 act
.sa_mask
:= Tmp_Set
;
1170 Signal
(System
.Interrupt_Management
.Abort_Task_Interrupt
),
1171 act
'Unchecked_Access,
1172 old_act
'Unchecked_Access);
1173 pragma Assert
(Result
= 0);
1177 -- NOTE: Unlike other pthread implementations, we do *not* mask all
1178 -- signals here since we handle signals using the process-wide primitive
1179 -- signal, rather than using sigthreadmask and sigwait. The reason of
1180 -- this difference is that sigwait doesn't work when some critical
1181 -- signals (SIGABRT, SIGPIPE) are masked.
1183 end System
.Task_Primitives
.Operations
;