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 a POSIX-like version of this package
36 -- This package contains all the GNULL primitives that interface directly
37 -- with the underlying OS.
39 -- Note: this file can only be used for POSIX compliant systems that
40 -- implement SCHED_FIFO and Ceiling Locking correctly.
42 -- For configurations where SCHED_FIFO and priority ceiling are not a
43 -- requirement, this file can also be used (e.g AiX threads)
46 -- Turn off polling, we do not want ATC polling to take place during
47 -- tasking operations. It causes infinite loops and other problems.
49 with System.Tasking.Debug;
50 -- used for Known_Tasks
52 with System.Task_Info;
53 -- used for Task_Info_Type
59 with System.Interrupt_Management;
60 -- used for Keep_Unmasked
61 -- Abort_Task_Interrupt
64 with System.Interrupt_Management.Operations;
65 -- used for Set_Interrupt_Mask
67 pragma Elaborate_All (System.Interrupt_Management.Operations);
69 with System.Parameters;
73 -- used for Ada_Task_Control_Block
76 with System.Soft_Links;
77 -- used for Defer/Undefer_Abort
79 -- Note that we do not use System.Tasking.Initialization directly since
80 -- this is a higher level package that we shouldn't depend on. For example
81 -- when using the restricted run time, it is replaced by
82 -- System.Tasking.Restricted.Stages.
84 with System.OS_Primitives;
85 -- used for Delay_Modes
87 with Unchecked_Conversion;
88 with Unchecked_Deallocation;
90 package body System.Task_Primitives.Operations is
92 use System.Tasking.Debug;
95 use System.OS_Interface;
96 use System.Parameters;
97 use System.OS_Primitives;
99 package SSL renames System.Soft_Links;
105 -- The followings are logically constants, but need to be initialized
108 Single_RTS_Lock : aliased RTS_Lock;
109 -- This is a lock to allow only one thread of control in the RTS at
110 -- a time; it is used to execute in mutual exclusion from all other tasks.
111 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
113 ATCB_Key : aliased pthread_key_t;
114 -- Key used to find the Ada Task_Id associated with a thread
116 Environment_Task_Id : Task_Id;
117 -- A variable to hold Task_Id for the environment task.
119 Locking_Policy : Character;
120 pragma Import (C, Locking_Policy, "__gl_locking_policy");
121 -- Value of the pragma Locking_Policy:
122 -- 'C' for Ceiling_Locking
123 -- 'I' for Inherit_Locking
126 Unblocked_Signal_Mask : aliased sigset_t;
127 -- The set of signals that should unblocked in all tasks
129 -- The followings are internal configuration constants needed.
131 Next_Serial_Number : Task_Serial_Number := 100;
132 -- We start at 100, to reserve some special values for
133 -- using in error checking.
135 Time_Slice_Val : Integer;
136 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
138 Dispatching_Policy : Character;
139 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
141 FIFO_Within_Priorities : constant Boolean := Dispatching_Policy = 'F';
142 -- Indicates whether FIFO_Within_Priorities is set.
144 Foreign_Task_Elaborated : aliased Boolean := True;
145 -- Used to identified fake tasks (i.e., non-Ada Threads).
153 procedure Initialize (Environment_Task : Task_Id);
154 pragma Inline (Initialize);
155 -- Initialize various data needed by this package.
157 function Is_Valid_Task return Boolean;
158 pragma Inline (Is_Valid_Task);
159 -- Does executing thread have a TCB?
161 procedure Set (Self_Id : Task_Id);
163 -- Set the self id for the current task.
165 function Self return Task_Id;
166 pragma Inline (Self);
167 -- Return a pointer to the Ada Task Control Block of the calling task.
171 package body Specific is separate;
172 -- The body of this package is target specific.
174 ---------------------------------
175 -- Support for foreign threads --
176 ---------------------------------
178 function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
179 -- Allocate and Initialize a new ATCB for the current Thread.
181 function Register_Foreign_Thread
182 (Thread : Thread_Id) return Task_Id is separate;
184 -----------------------
185 -- Local Subprograms --
186 -----------------------
188 procedure Abort_Handler (Sig : Signal);
189 -- Signal handler used to implement asynchronous abort.
190 -- See also comment before body, below.
192 function To_Address is new Unchecked_Conversion (Task_Id, System.Address);
198 -- Target-dependent binding of inter-thread Abort signal to
199 -- the raising of the Abort_Signal exception.
201 -- The technical issues and alternatives here are essentially
202 -- the same as for raising exceptions in response to other
203 -- signals (e.g. Storage_Error). See code and comments in
204 -- the package body System.Interrupt_Management.
206 -- Some implementations may not allow an exception to be propagated
207 -- out of a handler, and others might leave the signal or
208 -- interrupt that invoked this handler masked after the exceptional
209 -- return to the application code.
211 -- GNAT exceptions are originally implemented using setjmp()/longjmp().
212 -- On most UNIX systems, this will allow transfer out of a signal handler,
213 -- which is usually the only mechanism available for implementing
214 -- asynchronous handlers of this kind. However, some
215 -- systems do not restore the signal mask on longjmp(), leaving the
216 -- abort signal masked.
218 procedure Abort_Handler (Sig : Signal) is
219 pragma Warnings (Off, Sig);
221 T : constant Task_Id := Self;
222 Result : Interfaces.C.int;
223 Old_Set : aliased sigset_t;
226 -- It is not safe to raise an exception when using ZCX and the GCC
227 -- exception handling mechanism.
229 if ZCX_By_Default and then GCC_ZCX_Support then
233 if T.Deferral_Level = 0
234 and then T.Pending_ATC_Level < T.ATC_Nesting_Level and then
239 -- Make sure signals used for RTS internal purpose are unmasked
241 Result := pthread_sigmask (SIG_UNBLOCK,
242 Unblocked_Signal_Mask'Unchecked_Access, Old_Set'Unchecked_Access);
243 pragma Assert (Result = 0);
245 raise Standard'Abort_Signal;
253 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
254 Stack_Base : constant Address := Get_Stack_Base (T.Common.LL.Thread);
255 Guard_Page_Address : Address;
257 Res : Interfaces.C.int;
260 if Stack_Base_Available then
262 -- Compute the guard page address
264 Guard_Page_Address :=
265 Stack_Base - (Stack_Base mod Get_Page_Size) + Get_Page_Size;
268 Res := mprotect (Guard_Page_Address, Get_Page_Size, PROT_ON);
270 Res := mprotect (Guard_Page_Address, Get_Page_Size, PROT_OFF);
273 pragma Assert (Res = 0);
281 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
283 return T.Common.LL.Thread;
290 function Self return Task_Id renames Specific.Self;
292 ---------------------
293 -- Initialize_Lock --
294 ---------------------
296 -- Note: mutexes and cond_variables needed per-task basis are
297 -- initialized in Intialize_TCB and the Storage_Error is
298 -- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
299 -- used in RTS is initialized before any status change of RTS.
300 -- Therefore rasing Storage_Error in the following routines
301 -- should be able to be handled safely.
303 procedure Initialize_Lock
304 (Prio : System.Any_Priority;
307 Attributes : aliased pthread_mutexattr_t;
308 Result : Interfaces.C.int;
311 Result := pthread_mutexattr_init (Attributes'Access);
312 pragma Assert (Result = 0 or else Result = ENOMEM);
314 if Result = ENOMEM then
318 if Locking_Policy = 'C' then
319 Result := pthread_mutexattr_setprotocol
320 (Attributes'Access, PTHREAD_PRIO_PROTECT);
321 pragma Assert (Result = 0);
323 Result := pthread_mutexattr_setprioceiling
324 (Attributes'Access, Interfaces.C.int (Prio));
325 pragma Assert (Result = 0);
327 elsif Locking_Policy = 'I' then
328 Result := pthread_mutexattr_setprotocol
329 (Attributes'Access, PTHREAD_PRIO_INHERIT);
330 pragma Assert (Result = 0);
333 Result := pthread_mutex_init (L, Attributes'Access);
334 pragma Assert (Result = 0 or else Result = ENOMEM);
336 if Result = ENOMEM then
340 Result := pthread_mutexattr_destroy (Attributes'Access);
341 pragma Assert (Result = 0);
344 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
345 pragma Warnings (Off, Level);
347 Attributes : aliased pthread_mutexattr_t;
348 Result : Interfaces.C.int;
351 Result := pthread_mutexattr_init (Attributes'Access);
352 pragma Assert (Result = 0 or else Result = ENOMEM);
354 if Result = ENOMEM then
358 if Locking_Policy = 'C' then
359 Result := pthread_mutexattr_setprotocol
360 (Attributes'Access, PTHREAD_PRIO_PROTECT);
361 pragma Assert (Result = 0);
363 Result := pthread_mutexattr_setprioceiling
364 (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
365 pragma Assert (Result = 0);
367 elsif Locking_Policy = 'I' then
368 Result := pthread_mutexattr_setprotocol
369 (Attributes'Access, PTHREAD_PRIO_INHERIT);
370 pragma Assert (Result = 0);
373 Result := pthread_mutex_init (L, Attributes'Access);
374 pragma Assert (Result = 0 or else Result = ENOMEM);
376 if Result = ENOMEM then
377 Result := pthread_mutexattr_destroy (Attributes'Access);
381 Result := pthread_mutexattr_destroy (Attributes'Access);
382 pragma Assert (Result = 0);
389 procedure Finalize_Lock (L : access Lock) is
390 Result : Interfaces.C.int;
393 Result := pthread_mutex_destroy (L);
394 pragma Assert (Result = 0);
397 procedure Finalize_Lock (L : access RTS_Lock) is
398 Result : Interfaces.C.int;
401 Result := pthread_mutex_destroy (L);
402 pragma Assert (Result = 0);
409 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
410 Result : Interfaces.C.int;
413 Result := pthread_mutex_lock (L);
415 -- Assume that the cause of EINVAL is a priority ceiling violation
417 Ceiling_Violation := (Result = EINVAL);
418 pragma Assert (Result = 0 or else Result = EINVAL);
422 (L : access RTS_Lock;
423 Global_Lock : Boolean := False)
425 Result : Interfaces.C.int;
428 if not Single_Lock or else Global_Lock then
429 Result := pthread_mutex_lock (L);
430 pragma Assert (Result = 0);
434 procedure Write_Lock (T : Task_Id) is
435 Result : Interfaces.C.int;
438 if not Single_Lock then
439 Result := pthread_mutex_lock (T.Common.LL.L'Access);
440 pragma Assert (Result = 0);
448 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
450 Write_Lock (L, Ceiling_Violation);
457 procedure Unlock (L : access Lock) is
458 Result : Interfaces.C.int;
461 Result := pthread_mutex_unlock (L);
462 pragma Assert (Result = 0);
465 procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
466 Result : Interfaces.C.int;
469 if not Single_Lock or else Global_Lock then
470 Result := pthread_mutex_unlock (L);
471 pragma Assert (Result = 0);
475 procedure Unlock (T : Task_Id) is
476 Result : Interfaces.C.int;
479 if not Single_Lock then
480 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
481 pragma Assert (Result = 0);
491 Reason : System.Tasking.Task_States)
493 pragma Warnings (Off, Reason);
495 Result : Interfaces.C.int;
499 Result := pthread_cond_wait
500 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
502 Result := pthread_cond_wait
503 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
506 -- EINTR is not considered a failure.
508 pragma Assert (Result = 0 or else Result = EINTR);
515 -- This is for use within the run-time system, so abort is
516 -- assumed to be already deferred, and the caller should be
517 -- holding its own ATCB lock.
519 procedure Timed_Sleep
522 Mode : ST.Delay_Modes;
523 Reason : Task_States;
524 Timedout : out Boolean;
525 Yielded : out Boolean)
527 pragma Warnings (Off, Reason);
529 Check_Time : constant Duration := Monotonic_Clock;
532 Request : aliased timespec;
533 Result : Interfaces.C.int;
539 if Mode = Relative then
540 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
542 if Relative_Timed_Wait then
543 Rel_Time := Duration'Min (Max_Sensible_Delay, Time);
547 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
549 if Relative_Timed_Wait then
550 Rel_Time := Duration'Min (Max_Sensible_Delay, Time - Check_Time);
554 if Abs_Time > Check_Time then
555 if Relative_Timed_Wait then
556 Request := To_Timespec (Rel_Time);
558 Request := To_Timespec (Abs_Time);
562 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
563 or else Self_ID.Pending_Priority_Change;
566 Result := pthread_cond_timedwait
567 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access,
571 Result := pthread_cond_timedwait
572 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
576 exit when Abs_Time <= Monotonic_Clock;
578 if Result = 0 or Result = EINTR then
580 -- Somebody may have called Wakeup for us
586 pragma Assert (Result = ETIMEDOUT);
595 -- This is for use in implementing delay statements, so
596 -- we assume the caller is abort-deferred but is holding
599 procedure Timed_Delay
602 Mode : ST.Delay_Modes)
604 Check_Time : constant Duration := Monotonic_Clock;
607 Request : aliased timespec;
608 Result : Interfaces.C.int;
611 -- Only the little window between deferring abort and
612 -- locking Self_ID is the reason we need to
613 -- check for pending abort and priority change below! :(
621 Write_Lock (Self_ID);
623 if Mode = Relative then
624 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
626 if Relative_Timed_Wait then
627 Rel_Time := Duration'Min (Max_Sensible_Delay, Time);
631 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
633 if Relative_Timed_Wait then
634 Rel_Time := Duration'Min (Max_Sensible_Delay, Time - Check_Time);
638 if Abs_Time > Check_Time then
639 if Relative_Timed_Wait then
640 Request := To_Timespec (Rel_Time);
642 Request := To_Timespec (Abs_Time);
645 Self_ID.Common.State := Delay_Sleep;
648 if Self_ID.Pending_Priority_Change then
649 Self_ID.Pending_Priority_Change := False;
650 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
651 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
654 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
657 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
658 Single_RTS_Lock'Access, Request'Access);
660 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
661 Self_ID.Common.LL.L'Access, Request'Access);
664 exit when Abs_Time <= Monotonic_Clock;
666 pragma Assert (Result = 0
667 or else Result = ETIMEDOUT
668 or else Result = EINTR);
671 Self_ID.Common.State := Runnable;
680 Result := sched_yield;
681 SSL.Abort_Undefer.all;
684 ---------------------
685 -- Monotonic_Clock --
686 ---------------------
688 function Monotonic_Clock return Duration is
689 TS : aliased timespec;
690 Result : Interfaces.C.int;
692 Result := clock_gettime
693 (clock_id => CLOCK_REALTIME, tp => TS'Unchecked_Access);
694 pragma Assert (Result = 0);
695 return To_Duration (TS);
702 function RT_Resolution return Duration is
711 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
712 pragma Warnings (Off, Reason);
713 Result : Interfaces.C.int;
715 Result := pthread_cond_signal (T.Common.LL.CV'Access);
716 pragma Assert (Result = 0);
723 procedure Yield (Do_Yield : Boolean := True) is
724 Result : Interfaces.C.int;
725 pragma Unreferenced (Result);
728 Result := sched_yield;
736 procedure Set_Priority
738 Prio : System.Any_Priority;
739 Loss_Of_Inheritance : Boolean := False)
741 pragma Warnings (Off, Loss_Of_Inheritance);
743 Result : Interfaces.C.int;
744 Param : aliased struct_sched_param;
747 T.Common.Current_Priority := Prio;
748 Param.sched_priority := Interfaces.C.int (Prio);
750 if Time_Slice_Supported and then Time_Slice_Val > 0 then
751 Result := pthread_setschedparam
752 (T.Common.LL.Thread, SCHED_RR, Param'Access);
754 elsif FIFO_Within_Priorities or else Time_Slice_Val = 0 then
755 Result := pthread_setschedparam
756 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
759 Result := pthread_setschedparam
760 (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
763 pragma Assert (Result = 0);
770 function Get_Priority (T : Task_Id) return System.Any_Priority is
772 return T.Common.Current_Priority;
779 procedure Enter_Task (Self_ID : Task_Id) is
781 Self_ID.Common.LL.Thread := pthread_self;
782 Self_ID.Common.LL.LWP := lwp_self;
784 Specific.Set (Self_ID);
788 for J in Known_Tasks'Range loop
789 if Known_Tasks (J) = null then
790 Known_Tasks (J) := Self_ID;
791 Self_ID.Known_Tasks_Index := J;
803 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
805 return new Ada_Task_Control_Block (Entry_Num);
812 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
814 -----------------------------
815 -- Register_Foreign_Thread --
816 -----------------------------
818 function Register_Foreign_Thread return Task_Id is
820 if Is_Valid_Task then
823 return Register_Foreign_Thread (pthread_self);
825 end Register_Foreign_Thread;
831 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
832 Mutex_Attr : aliased pthread_mutexattr_t;
833 Result : Interfaces.C.int;
834 Cond_Attr : aliased pthread_condattr_t;
837 -- Give the task a unique serial number.
839 Self_ID.Serial_Number := Next_Serial_Number;
840 Next_Serial_Number := Next_Serial_Number + 1;
841 pragma Assert (Next_Serial_Number /= 0);
843 if not Single_Lock then
844 Result := pthread_mutexattr_init (Mutex_Attr'Access);
845 pragma Assert (Result = 0 or else Result = ENOMEM);
848 if Locking_Policy = 'C' then
849 Result := pthread_mutexattr_setprotocol
850 (Mutex_Attr'Access, PTHREAD_PRIO_PROTECT);
851 pragma Assert (Result = 0);
853 Result := pthread_mutexattr_setprioceiling
855 Interfaces.C.int (System.Any_Priority'Last));
856 pragma Assert (Result = 0);
858 elsif Locking_Policy = 'I' then
859 Result := pthread_mutexattr_setprotocol
860 (Mutex_Attr'Access, PTHREAD_PRIO_INHERIT);
861 pragma Assert (Result = 0);
864 Result := pthread_mutex_init (Self_ID.Common.LL.L'Access,
866 pragma Assert (Result = 0 or else Result = ENOMEM);
874 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
875 pragma Assert (Result = 0);
878 Result := pthread_condattr_init (Cond_Attr'Access);
879 pragma Assert (Result = 0 or else Result = ENOMEM);
882 Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
884 pragma Assert (Result = 0 or else Result = ENOMEM);
890 if not Single_Lock then
891 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
892 pragma Assert (Result = 0);
898 Result := pthread_condattr_destroy (Cond_Attr'Access);
899 pragma Assert (Result = 0);
906 procedure Create_Task
908 Wrapper : System.Address;
909 Stack_Size : System.Parameters.Size_Type;
910 Priority : System.Any_Priority;
911 Succeeded : out Boolean)
913 Attributes : aliased pthread_attr_t;
914 Adjusted_Stack_Size : Interfaces.C.size_t;
915 Result : Interfaces.C.int;
917 function Thread_Body_Access is new
918 Unchecked_Conversion (System.Address, Thread_Body);
920 use System.Task_Info;
923 if Stack_Size = Unspecified_Size then
924 Adjusted_Stack_Size := Interfaces.C.size_t (Default_Stack_Size);
926 elsif Stack_Size < Minimum_Stack_Size then
927 Adjusted_Stack_Size := Interfaces.C.size_t (Minimum_Stack_Size);
930 Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
933 if Stack_Base_Available then
934 -- If Stack Checking is supported then allocate 2 additional pages:
936 -- In the worst case, stack is allocated at something like
937 -- N * Get_Page_Size - epsilon, we need to add the size for 2 pages
938 -- to be sure the effective stack size is greater than what
941 Adjusted_Stack_Size := Adjusted_Stack_Size + 2 * Get_Page_Size;
944 Result := pthread_attr_init (Attributes'Access);
945 pragma Assert (Result = 0 or else Result = ENOMEM);
952 Result := pthread_attr_setdetachstate
953 (Attributes'Access, PTHREAD_CREATE_DETACHED);
954 pragma Assert (Result = 0);
956 Result := pthread_attr_setstacksize
957 (Attributes'Access, Adjusted_Stack_Size);
958 pragma Assert (Result = 0);
960 if T.Common.Task_Info /= Default_Scope then
962 -- We are assuming that Scope_Type has the same values than the
963 -- corresponding C macros
965 Result := pthread_attr_setscope
966 (Attributes'Access, Task_Info_Type'Pos (T.Common.Task_Info));
967 pragma Assert (Result = 0);
970 -- Since the initial signal mask of a thread is inherited from the
971 -- creator, and the Environment task has all its signals masked, we
972 -- do not need to manipulate caller's signal mask at this point.
973 -- All tasks in RTS will have All_Tasks_Mask initially.
975 Result := pthread_create
976 (T.Common.LL.Thread'Access,
978 Thread_Body_Access (Wrapper),
980 pragma Assert (Result = 0 or else Result = EAGAIN);
982 Succeeded := Result = 0;
984 Result := pthread_attr_destroy (Attributes'Access);
985 pragma Assert (Result = 0);
987 Set_Priority (T, Priority);
994 procedure Finalize_TCB (T : Task_Id) is
995 Result : Interfaces.C.int;
997 Is_Self : constant Boolean := T = Self;
999 procedure Free is new
1000 Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
1003 if not Single_Lock then
1004 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
1005 pragma Assert (Result = 0);
1008 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
1009 pragma Assert (Result = 0);
1011 if T.Known_Tasks_Index /= -1 then
1012 Known_Tasks (T.Known_Tasks_Index) := null;
1018 Specific.Set (null);
1026 procedure Exit_Task is
1028 -- Mark this task as unknown, so that if Self is called, it won't
1029 -- return a dangling pointer.
1031 Specific.Set (null);
1038 procedure Abort_Task (T : Task_Id) is
1039 Result : Interfaces.C.int;
1042 Result := pthread_kill (T.Common.LL.Thread,
1043 Signal (System.Interrupt_Management.Abort_Task_Interrupt));
1044 pragma Assert (Result = 0);
1053 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
1054 pragma Warnings (Off, Self_ID);
1059 --------------------
1060 -- Check_No_Locks --
1061 --------------------
1063 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
1064 pragma Warnings (Off, Self_ID);
1069 ----------------------
1070 -- Environment_Task --
1071 ----------------------
1073 function Environment_Task return Task_Id is
1075 return Environment_Task_Id;
1076 end Environment_Task;
1082 procedure Lock_RTS is
1084 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
1091 procedure Unlock_RTS is
1093 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
1100 function Suspend_Task
1102 Thread_Self : Thread_Id) return Boolean
1104 pragma Warnings (Off, T);
1105 pragma Warnings (Off, Thread_Self);
1114 function Resume_Task
1116 Thread_Self : Thread_Id) return Boolean
1118 pragma Warnings (Off, T);
1119 pragma Warnings (Off, Thread_Self);
1128 procedure Initialize (Environment_Task : Task_Id) is
1129 act : aliased struct_sigaction;
1130 old_act : aliased struct_sigaction;
1131 Tmp_Set : aliased sigset_t;
1132 Result : Interfaces.C.int;
1135 (Int : System.Interrupt_Management.Interrupt_ID) return Character;
1136 pragma Import (C, State, "__gnat_get_interrupt_state");
1137 -- Get interrupt state. Defined in a-init.c
1138 -- The input argument is the interrupt number,
1139 -- and the result is one of the following:
1141 Default : constant Character := 's';
1142 -- 'n' this interrupt not set by any Interrupt_State pragma
1143 -- 'u' Interrupt_State pragma set state to User
1144 -- 'r' Interrupt_State pragma set state to Runtime
1145 -- 's' Interrupt_State pragma set state to System (use "default"
1149 Environment_Task_Id := Environment_Task;
1151 -- Initialize the lock used to synchronize chain of all ATCBs.
1153 Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
1155 Specific.Initialize (Environment_Task);
1157 Enter_Task (Environment_Task);
1159 -- Install the abort-signal handler
1161 if State (System.Interrupt_Management.Abort_Task_Interrupt)
1165 act.sa_handler := Abort_Handler'Address;
1167 Result := sigemptyset (Tmp_Set'Access);
1168 pragma Assert (Result = 0);
1169 act.sa_mask := Tmp_Set;
1173 (Signal (System.Interrupt_Management.Abort_Task_Interrupt),
1174 act'Unchecked_Access,
1175 old_act'Unchecked_Access);
1176 pragma Assert (Result = 0);
1182 Result : Interfaces.C.int;
1184 -- Mask Environment task for all signals. The original mask of the
1185 -- Environment task will be recovered by Interrupt_Server task
1186 -- during the elaboration of s-interr.adb.
1188 System.Interrupt_Management.Operations.Set_Interrupt_Mask
1189 (System.Interrupt_Management.Operations.All_Tasks_Mask'Access);
1191 -- Prepare the set of signals that should unblocked in all tasks
1193 Result := sigemptyset (Unblocked_Signal_Mask'Access);
1194 pragma Assert (Result = 0);
1196 for J in Interrupt_Management.Interrupt_ID loop
1197 if System.Interrupt_Management.Keep_Unmasked (J) then
1198 Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
1199 pragma Assert (Result = 0);
1203 end System.Task_Primitives.Operations;