1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S --
9 -- Copyright (C) 1992-2004, Free Software Foundation, Inc. --
11 -- GNARL is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is the VxWorks 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
50 -- Initialize_Interrupts
52 with System
.Soft_Links
;
53 -- used for Defer/Undefer_Abort
55 -- Note that we do not use System.Tasking.Initialization directly since
56 -- this is a higher level package that we shouldn't depend on. For example
57 -- when using the restricted run time, it is replaced by
58 -- System.Tasking.Restricted.Stages.
60 with System
.OS_Interface
;
61 -- used for various type, constant, and operations
63 with System
.Parameters
;
67 -- used for Ada_Task_Control_Block
69 -- ATCB components and types
73 with Unchecked_Conversion
;
74 with Unchecked_Deallocation
;
76 package body System
.Task_Primitives
.Operations
is
78 use System
.Tasking
.Debug
;
80 use System
.OS_Interface
;
81 use System
.Parameters
;
82 use type Interfaces
.C
.int
;
84 package SSL
renames System
.Soft_Links
;
86 subtype int
is System
.OS_Interface
.int
;
88 Relative
: constant := 0;
94 -- The followings are logically constants, but need to be initialized
97 Single_RTS_Lock
: aliased RTS_Lock
;
98 -- This is a lock to allow only one thread of control in the RTS at
99 -- a time; it is used to execute in mutual exclusion from all other tasks.
100 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
102 ATCB_Key
: aliased System
.Address
:= System
.Null_Address
;
103 -- Key used to find the Ada Task_Id associated with a thread
105 ATCB_Key_Addr
: System
.Address
:= ATCB_Key
'Address;
106 pragma Export
(Ada
, ATCB_Key_Addr
, "__gnat_ATCB_key_addr");
107 -- Exported to support the temporary AE653 task registration
108 -- implementation. This mechanism is used to minimize impact on other
111 Environment_Task_Id
: Task_Id
;
112 -- A variable to hold Task_Id for the environment task.
114 Unblocked_Signal_Mask
: aliased sigset_t
;
115 -- The set of signals that should unblocked in all tasks
117 -- The followings are internal configuration constants needed.
119 Time_Slice_Val
: Integer;
120 pragma Import
(C
, Time_Slice_Val
, "__gl_time_slice_val");
122 Locking_Policy
: Character;
123 pragma Import
(C
, Locking_Policy
, "__gl_locking_policy");
125 Dispatching_Policy
: Character;
126 pragma Import
(C
, Dispatching_Policy
, "__gl_task_dispatching_policy");
128 FIFO_Within_Priorities
: constant Boolean := Dispatching_Policy
= 'F';
129 -- Indicates whether FIFO_Within_Priorities is set.
131 Mutex_Protocol
: Priority_Type
;
133 Foreign_Task_Elaborated
: aliased Boolean := True;
134 -- Used to identified fake tasks (i.e., non-Ada Threads).
142 function Is_Valid_Task
return Boolean;
143 pragma Inline
(Is_Valid_Task
);
144 -- Does executing thread have a TCB?
146 procedure Set
(Self_Id
: Task_Id
);
148 -- Set the self id for the current task.
150 function Self
return Task_Id
;
151 pragma Inline
(Self
);
152 -- Return a pointer to the Ada Task Control Block of the calling task.
156 package body Specific
is separate;
157 -- The body of this package is target specific.
159 ---------------------------------
160 -- Support for foreign threads --
161 ---------------------------------
163 function Register_Foreign_Thread
(Thread
: Thread_Id
) return Task_Id
;
164 -- Allocate and Initialize a new ATCB for the current Thread.
166 function Register_Foreign_Thread
167 (Thread
: Thread_Id
) return Task_Id
is separate;
169 -----------------------
170 -- Local Subprograms --
171 -----------------------
173 procedure Abort_Handler
(signo
: Signal
);
174 -- Handler for the abort (SIGABRT) signal to handle asynchronous abortion.
176 procedure Install_Signal_Handlers
;
177 -- Install the default signal handlers for the current task
179 function To_Address
is new Unchecked_Conversion
(Task_Id
, System
.Address
);
185 procedure Abort_Handler
(signo
: Signal
) is
186 pragma Unreferenced
(signo
);
188 Self_ID
: constant Task_Id
:= Self
;
190 Old_Set
: aliased sigset_t
;
193 -- It is not safe to raise an exception when using ZCX and the GCC
194 -- exception handling mechanism.
196 if ZCX_By_Default
and then GCC_ZCX_Support
then
200 if Self_ID
.Deferral_Level
= 0
201 and then Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
202 and then not Self_ID
.Aborting
204 Self_ID
.Aborting
:= True;
206 -- Make sure signals used for RTS internal purpose are unmasked
208 Result
:= pthread_sigmask
(SIG_UNBLOCK
,
209 Unblocked_Signal_Mask
'Unchecked_Access, Old_Set
'Unchecked_Access);
210 pragma Assert
(Result
= 0);
212 raise Standard
'Abort_Signal;
220 procedure Stack_Guard
(T
: ST
.Task_Id
; On
: Boolean) is
221 pragma Unreferenced
(T
);
222 pragma Unreferenced
(On
);
225 -- Nothing needed (why not???)
234 function Get_Thread_Id
(T
: ST
.Task_Id
) return OSI
.Thread_Id
is
236 return T
.Common
.LL
.Thread
;
243 function Self
return Task_Id
renames Specific
.Self
;
245 -----------------------------
246 -- Install_Signal_Handlers --
247 -----------------------------
249 procedure Install_Signal_Handlers
is
250 act
: aliased struct_sigaction
;
251 old_act
: aliased struct_sigaction
;
252 Tmp_Set
: aliased sigset_t
;
257 act
.sa_handler
:= Abort_Handler
'Address;
259 Result
:= sigemptyset
(Tmp_Set
'Access);
260 pragma Assert
(Result
= 0);
261 act
.sa_mask
:= Tmp_Set
;
265 (Signal
(Interrupt_Management
.Abort_Task_Signal
),
266 act
'Unchecked_Access,
267 old_act
'Unchecked_Access);
268 pragma Assert
(Result
= 0);
270 Interrupt_Management
.Initialize_Interrupts
;
271 end Install_Signal_Handlers
;
273 ---------------------
274 -- Initialize_Lock --
275 ---------------------
277 procedure Initialize_Lock
(Prio
: System
.Any_Priority
; L
: access Lock
) is
279 L
.Mutex
:= semMCreate
(SEM_Q_PRIORITY
+ SEM_INVERSION_SAFE
);
280 L
.Prio_Ceiling
:= int
(Prio
);
281 L
.Protocol
:= Mutex_Protocol
;
282 pragma Assert
(L
.Mutex
/= 0);
285 procedure Initialize_Lock
(L
: access RTS_Lock
; Level
: Lock_Level
) is
286 pragma Unreferenced
(Level
);
289 L
.Mutex
:= semMCreate
(SEM_Q_PRIORITY
+ SEM_INVERSION_SAFE
);
290 L
.Prio_Ceiling
:= int
(System
.Any_Priority
'Last);
291 L
.Protocol
:= Mutex_Protocol
;
292 pragma Assert
(L
.Mutex
/= 0);
299 procedure Finalize_Lock
(L
: access Lock
) is
303 Result
:= semDelete
(L
.Mutex
);
304 pragma Assert
(Result
= 0);
307 procedure Finalize_Lock
(L
: access RTS_Lock
) is
311 Result
:= semDelete
(L
.Mutex
);
312 pragma Assert
(Result
= 0);
319 procedure Write_Lock
(L
: access Lock
; Ceiling_Violation
: out Boolean) is
323 if L
.Protocol
= Prio_Protect
324 and then int
(Self
.Common
.Current_Priority
) > L
.Prio_Ceiling
326 Ceiling_Violation
:= True;
329 Ceiling_Violation
:= False;
332 Result
:= semTake
(L
.Mutex
, WAIT_FOREVER
);
333 pragma Assert
(Result
= 0);
337 (L
: access RTS_Lock
;
338 Global_Lock
: Boolean := False)
343 if not Single_Lock
or else Global_Lock
then
344 Result
:= semTake
(L
.Mutex
, WAIT_FOREVER
);
345 pragma Assert
(Result
= 0);
349 procedure Write_Lock
(T
: Task_Id
) is
353 if not Single_Lock
then
354 Result
:= semTake
(T
.Common
.LL
.L
.Mutex
, WAIT_FOREVER
);
355 pragma Assert
(Result
= 0);
363 procedure Read_Lock
(L
: access Lock
; Ceiling_Violation
: out Boolean) is
365 Write_Lock
(L
, Ceiling_Violation
);
372 procedure Unlock
(L
: access Lock
) is
376 Result
:= semGive
(L
.Mutex
);
377 pragma Assert
(Result
= 0);
380 procedure Unlock
(L
: access RTS_Lock
; Global_Lock
: Boolean := False) is
384 if not Single_Lock
or else Global_Lock
then
385 Result
:= semGive
(L
.Mutex
);
386 pragma Assert
(Result
= 0);
390 procedure Unlock
(T
: Task_Id
) is
394 if not Single_Lock
then
395 Result
:= semGive
(T
.Common
.LL
.L
.Mutex
);
396 pragma Assert
(Result
= 0);
404 procedure Sleep
(Self_ID
: Task_Id
; Reason
: System
.Tasking
.Task_States
) is
405 pragma Unreferenced
(Reason
);
410 pragma Assert
(Self_ID
= Self
);
412 -- Release the mutex before sleeping.
414 Result
:= semGive
(Single_RTS_Lock
.Mutex
);
416 Result
:= semGive
(Self_ID
.Common
.LL
.L
.Mutex
);
419 pragma Assert
(Result
= 0);
421 -- Perform a blocking operation to take the CV semaphore.
422 -- Note that a blocking operation in VxWorks will reenable
423 -- task scheduling. When we are no longer blocked and control
424 -- is returned, task scheduling will again be disabled.
426 Result
:= semTake
(Self_ID
.Common
.LL
.CV
, WAIT_FOREVER
);
427 pragma Assert
(Result
= 0);
429 -- Take the mutex back.
431 Result
:= semTake
(Single_RTS_Lock
.Mutex
, WAIT_FOREVER
);
433 Result
:= semTake
(Self_ID
.Common
.LL
.L
.Mutex
, WAIT_FOREVER
);
436 pragma Assert
(Result
= 0);
443 -- This is for use within the run-time system, so abort is
444 -- assumed to be already deferred, and the caller should be
445 -- holding its own ATCB lock.
447 procedure Timed_Sleep
450 Mode
: ST
.Delay_Modes
;
451 Reason
: System
.Tasking
.Task_States
;
452 Timedout
: out Boolean;
453 Yielded
: out Boolean)
455 pragma Unreferenced
(Reason
);
457 Orig
: constant Duration := Monotonic_Clock
;
461 Wakeup
: Boolean := False;
467 if Mode
= Relative
then
468 Absolute
:= Orig
+ Time
;
470 -- Systematically add one since the first tick will delay
471 -- *at most* 1 / Rate_Duration seconds, so we need to add one to
472 -- be on the safe side.
474 Ticks
:= To_Clock_Ticks
(Time
);
476 if Ticks
> 0 and then Ticks
< int
'Last then
482 Ticks
:= To_Clock_Ticks
(Time
- Monotonic_Clock
);
487 -- Release the mutex before sleeping.
489 Result
:= semGive
(Single_RTS_Lock
.Mutex
);
491 Result
:= semGive
(Self_ID
.Common
.LL
.L
.Mutex
);
494 pragma Assert
(Result
= 0);
496 -- Perform a blocking operation to take the CV semaphore.
497 -- Note that a blocking operation in VxWorks will reenable
498 -- task scheduling. When we are no longer blocked and control
499 -- is returned, task scheduling will again be disabled.
501 Result
:= semTake
(Self_ID
.Common
.LL
.CV
, Ticks
);
504 -- Somebody may have called Wakeup for us
509 if errno
/= S_objLib_OBJ_TIMEOUT
then
512 -- If Ticks = int'last, it was most probably truncated
513 -- so let's make another round after recomputing Ticks
514 -- from the the absolute time.
516 if Ticks
/= int
'Last then
519 Ticks
:= To_Clock_Ticks
(Absolute
- Monotonic_Clock
);
528 -- Take the mutex back.
530 Result
:= semTake
(Single_RTS_Lock
.Mutex
, WAIT_FOREVER
);
532 Result
:= semTake
(Self_ID
.Common
.LL
.L
.Mutex
, WAIT_FOREVER
);
535 pragma Assert
(Result
= 0);
537 exit when Timedout
or Wakeup
;
543 -- Should never hold a lock while yielding.
545 Result
:= semGive
(Single_RTS_Lock
.Mutex
);
547 Result
:= semTake
(Single_RTS_Lock
.Mutex
, WAIT_FOREVER
);
550 Result
:= semGive
(Self_ID
.Common
.LL
.L
.Mutex
);
552 Result
:= semTake
(Self_ID
.Common
.LL
.L
.Mutex
, WAIT_FOREVER
);
561 -- This is for use in implementing delay statements, so
562 -- we assume the caller is holding no locks.
564 procedure Timed_Delay
567 Mode
: ST
.Delay_Modes
)
569 Orig
: constant Duration := Monotonic_Clock
;
574 Aborted
: Boolean := False;
579 if Mode
= Relative
then
580 Absolute
:= Orig
+ Time
;
581 Ticks
:= To_Clock_Ticks
(Time
);
583 if Ticks
> 0 and then Ticks
< int
'Last then
585 -- The first tick will delay anytime between 0 and
586 -- 1 / sysClkRateGet seconds, so we need to add one to
587 -- be on the safe side.
594 Ticks
:= To_Clock_Ticks
(Time
- Orig
);
598 -- Modifying State and Pending_Priority_Change, locking the TCB.
600 Result
:= semTake
(Single_RTS_Lock
.Mutex
, WAIT_FOREVER
);
602 Result
:= semTake
(Self_ID
.Common
.LL
.L
.Mutex
, WAIT_FOREVER
);
605 pragma Assert
(Result
= 0);
607 Self_ID
.Common
.State
:= Delay_Sleep
;
611 if Self_ID
.Pending_Priority_Change
then
612 Self_ID
.Pending_Priority_Change
:= False;
613 Self_ID
.Common
.Base_Priority
:= Self_ID
.New_Base_Priority
;
614 Set_Priority
(Self_ID
, Self_ID
.Common
.Base_Priority
);
617 Aborted
:= Self_ID
.Pending_ATC_Level
< Self_ID
.ATC_Nesting_Level
;
619 -- Release the TCB before sleeping
622 Result
:= semGive
(Single_RTS_Lock
.Mutex
);
624 Result
:= semGive
(Self_ID
.Common
.LL
.L
.Mutex
);
626 pragma Assert
(Result
= 0);
630 Result
:= semTake
(Self_ID
.Common
.LL
.CV
, Ticks
);
633 -- If Ticks = int'last, it was most probably truncated
634 -- so let's make another round after recomputing Ticks
635 -- from the the absolute time.
637 if errno
= S_objLib_OBJ_TIMEOUT
and then Ticks
/= int
'Last then
640 Ticks
:= To_Clock_Ticks
(Absolute
- Monotonic_Clock
);
648 -- Take back the lock after having slept, to protect further
652 Result
:= semTake
(Single_RTS_Lock
.Mutex
, WAIT_FOREVER
);
654 Result
:= semTake
(Self_ID
.Common
.LL
.L
.Mutex
, WAIT_FOREVER
);
657 pragma Assert
(Result
= 0);
662 Self_ID
.Common
.State
:= Runnable
;
665 Result
:= semGive
(Single_RTS_Lock
.Mutex
);
667 Result
:= semGive
(Self_ID
.Common
.LL
.L
.Mutex
);
674 SSL
.Abort_Undefer
.all;
677 ---------------------
678 -- Monotonic_Clock --
679 ---------------------
681 function Monotonic_Clock
return Duration is
682 TS
: aliased timespec
;
685 Result
:= clock_gettime
(CLOCK_REALTIME
, TS
'Unchecked_Access);
686 pragma Assert
(Result
= 0);
687 return To_Duration
(TS
);
694 function RT_Resolution
return Duration is
696 return 1.0 / Duration (sysClkRateGet
);
703 procedure Wakeup
(T
: Task_Id
; Reason
: System
.Tasking
.Task_States
) is
704 pragma Unreferenced
(Reason
);
707 Result
:= semGive
(T
.Common
.LL
.CV
);
708 pragma Assert
(Result
= 0);
715 procedure Yield
(Do_Yield
: Boolean := True) is
716 pragma Unreferenced
(Do_Yield
);
718 pragma Unreferenced
(Result
);
720 Result
:= taskDelay
(0);
727 type Prio_Array_Type
is array (System
.Any_Priority
) of Integer;
728 pragma Atomic_Components
(Prio_Array_Type
);
730 Prio_Array
: Prio_Array_Type
;
731 -- Global array containing the id of the currently running task for
732 -- each priority. Note that we assume that we are on a single processor
733 -- with run-till-blocked scheduling.
735 procedure Set_Priority
737 Prio
: System
.Any_Priority
;
738 Loss_Of_Inheritance
: Boolean := False)
740 Array_Item
: Integer;
746 (T
.Common
.LL
.Thread
, To_VxWorks_Priority
(int
(Prio
)));
747 pragma Assert
(Result
= 0);
749 if FIFO_Within_Priorities
then
751 -- Annex D requirement [RM D.2.2 par. 9]:
752 -- If the task drops its priority due to the loss of inherited
753 -- priority, it is added at the head of the ready queue for its
754 -- new active priority.
756 if Loss_Of_Inheritance
757 and then Prio
< T
.Common
.Current_Priority
759 Array_Item
:= Prio_Array
(T
.Common
.Base_Priority
) + 1;
760 Prio_Array
(T
.Common
.Base_Priority
) := Array_Item
;
763 -- Give some processes a chance to arrive
767 -- Then wait for our turn to proceed
769 exit when Array_Item
= Prio_Array
(T
.Common
.Base_Priority
)
770 or else Prio_Array
(T
.Common
.Base_Priority
) = 1;
773 Prio_Array
(T
.Common
.Base_Priority
) :=
774 Prio_Array
(T
.Common
.Base_Priority
) - 1;
778 T
.Common
.Current_Priority
:= Prio
;
785 function Get_Priority
(T
: Task_Id
) return System
.Any_Priority
is
787 return T
.Common
.Current_Priority
;
794 procedure Enter_Task
(Self_ID
: Task_Id
) is
795 procedure Init_Float
;
796 pragma Import
(C
, Init_Float
, "__gnat_init_float");
797 -- Properly initializes the FPU for PPC/MIPS systems.
800 Self_ID
.Common
.LL
.Thread
:= taskIdSelf
;
801 Specific
.Set
(Self_ID
);
805 -- Install the signal handlers.
806 -- This is called for each task since there is no signal inheritance
807 -- between VxWorks tasks.
809 Install_Signal_Handlers
;
813 for J
in Known_Tasks
'Range loop
814 if Known_Tasks
(J
) = null then
815 Known_Tasks
(J
) := Self_ID
;
816 Self_ID
.Known_Tasks_Index
:= J
;
828 function New_ATCB
(Entry_Num
: Task_Entry_Index
) return Task_Id
is
830 return new Ada_Task_Control_Block
(Entry_Num
);
837 function Is_Valid_Task
return Boolean renames Specific
.Is_Valid_Task
;
839 -----------------------------
840 -- Register_Foreign_Thread --
841 -----------------------------
843 function Register_Foreign_Thread
return Task_Id
is
845 if Is_Valid_Task
then
848 return Register_Foreign_Thread
(taskIdSelf
);
850 end Register_Foreign_Thread
;
856 procedure Initialize_TCB
(Self_ID
: Task_Id
; Succeeded
: out Boolean) is
858 Self_ID
.Common
.LL
.CV
:= semBCreate
(SEM_Q_PRIORITY
, SEM_EMPTY
);
859 Self_ID
.Common
.LL
.Thread
:= 0;
861 if Self_ID
.Common
.LL
.CV
= 0 then
866 if not Single_Lock
then
867 Initialize_Lock
(Self_ID
.Common
.LL
.L
'Access, ATCB_Level
);
876 procedure Create_Task
878 Wrapper
: System
.Address
;
879 Stack_Size
: System
.Parameters
.Size_Type
;
880 Priority
: System
.Any_Priority
;
881 Succeeded
: out Boolean)
883 Adjusted_Stack_Size
: size_t
;
885 if Stack_Size
= Unspecified_Size
then
886 Adjusted_Stack_Size
:= size_t
(Default_Stack_Size
);
888 elsif Stack_Size
< Minimum_Stack_Size
then
889 Adjusted_Stack_Size
:= size_t
(Minimum_Stack_Size
);
892 Adjusted_Stack_Size
:= size_t
(Stack_Size
);
895 -- Ask for 4 extra bytes of stack space so that the ATCB
896 -- pointer can be stored below the stack limit, plus extra
897 -- space for the frame of Task_Wrapper. This is so the user
898 -- gets the amount of stack requested exclusive of the needs
901 -- We also have to allocate n more bytes for the task name
902 -- storage and enough space for the Wind Task Control Block
903 -- which is around 0x778 bytes. VxWorks also seems to carve out
904 -- additional space, so use 2048 as a nice round number.
905 -- We might want to increment to the nearest page size in
906 -- case we ever support VxVMI.
908 -- XXX - we should come back and visit this so we can
909 -- set the task name to something appropriate.
911 Adjusted_Stack_Size
:= Adjusted_Stack_Size
+ 2048;
913 -- Since the initial signal mask of a thread is inherited from the
914 -- creator, and the Environment task has all its signals masked, we
915 -- do not need to manipulate caller's signal mask at this point.
916 -- All tasks in RTS will have All_Tasks_Mask initially.
918 if T
.Common
.Task_Image_Len
= 0 then
919 T
.Common
.LL
.Thread
:= taskSpawn
920 (System
.Null_Address
,
921 To_VxWorks_Priority
(int
(Priority
)),
928 Name
: aliased String (1 .. T
.Common
.Task_Image_Len
+ 1);
930 Name
(1 .. Name
'Last - 1) :=
931 T
.Common
.Task_Image
(1 .. T
.Common
.Task_Image_Len
);
932 Name
(Name
'Last) := ASCII
.NUL
;
934 T
.Common
.LL
.Thread
:= taskSpawn
936 To_VxWorks_Priority
(int
(Priority
)),
944 if T
.Common
.LL
.Thread
= -1 then
950 Task_Creation_Hook
(T
.Common
.LL
.Thread
);
951 Set_Priority
(T
, Priority
);
958 procedure Finalize_TCB
(T
: Task_Id
) is
961 Is_Self
: constant Boolean := (T
= Self
);
963 procedure Free
is new
964 Unchecked_Deallocation
(Ada_Task_Control_Block
, Task_Id
);
967 if not Single_Lock
then
968 Result
:= semDelete
(T
.Common
.LL
.L
.Mutex
);
969 pragma Assert
(Result
= 0);
972 T
.Common
.LL
.Thread
:= 0;
974 Result
:= semDelete
(T
.Common
.LL
.CV
);
975 pragma Assert
(Result
= 0);
977 if T
.Known_Tasks_Index
/= -1 then
978 Known_Tasks
(T
.Known_Tasks_Index
) := null;
984 Result
:= taskVarDelete
(taskIdSelf
, ATCB_Key
'Access);
985 pragma Assert
(Result
/= ERROR
);
993 procedure Exit_Task
is
1002 procedure Abort_Task
(T
: Task_Id
) is
1006 Result
:= kill
(T
.Common
.LL
.Thread
,
1007 Signal
(Interrupt_Management
.Abort_Task_Signal
));
1008 pragma Assert
(Result
= 0);
1017 function Check_Exit
(Self_ID
: ST
.Task_Id
) return Boolean is
1018 pragma Unreferenced
(Self_ID
);
1023 --------------------
1024 -- Check_No_Locks --
1025 --------------------
1027 function Check_No_Locks
(Self_ID
: ST
.Task_Id
) return Boolean is
1028 pragma Unreferenced
(Self_ID
);
1033 ----------------------
1034 -- Environment_Task --
1035 ----------------------
1037 function Environment_Task
return Task_Id
is
1039 return Environment_Task_Id
;
1040 end Environment_Task
;
1046 procedure Lock_RTS
is
1048 Write_Lock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
1055 procedure Unlock_RTS
is
1057 Unlock
(Single_RTS_Lock
'Access, Global_Lock
=> True);
1064 function Suspend_Task
1066 Thread_Self
: Thread_Id
) return Boolean
1069 if T
.Common
.LL
.Thread
/= 0
1070 and then T
.Common
.LL
.Thread
/= Thread_Self
1072 return taskSuspend
(T
.Common
.LL
.Thread
) = 0;
1082 function Resume_Task
1084 Thread_Self
: Thread_Id
) return Boolean
1087 if T
.Common
.LL
.Thread
/= 0
1088 and then T
.Common
.LL
.Thread
/= Thread_Self
1090 return taskResume
(T
.Common
.LL
.Thread
) = 0;
1100 procedure Initialize
(Environment_Task
: Task_Id
) is
1104 if Locking_Policy
= 'C' then
1105 Mutex_Protocol
:= Prio_Protect
;
1106 elsif Locking_Policy
= 'I' then
1107 Mutex_Protocol
:= Prio_Inherit
;
1109 Mutex_Protocol
:= Prio_None
;
1112 if Time_Slice_Val
> 0 then
1113 Result
:= kernelTimeSlice
1115 (Duration (Time_Slice_Val
) / Duration (1_000_000
.0
)));
1118 Result
:= sigemptyset
(Unblocked_Signal_Mask
'Access);
1119 pragma Assert
(Result
= 0);
1121 for J
in Interrupt_Management
.Signal_ID
loop
1122 if System
.Interrupt_Management
.Keep_Unmasked
(J
) then
1123 Result
:= sigaddset
(Unblocked_Signal_Mask
'Access, Signal
(J
));
1124 pragma Assert
(Result
= 0);
1128 Environment_Task_Id
:= Environment_Task
;
1130 -- Initialize the lock used to synchronize chain of all ATCBs.
1132 Initialize_Lock
(Single_RTS_Lock
'Access, RTS_Lock_Level
);
1134 Enter_Task
(Environment_Task
);
1137 end System
.Task_Primitives
.Operations
;