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 LynxOS version of this file, adapted to make
35 -- SCHED_FIFO and ceiling locking (Annex D compliance) work properly
37 -- This package contains all the GNULL primitives that interface directly
38 -- with the underlying OS.
41 -- Turn off polling, we do not want ATC polling to take place during
42 -- tasking operations. It causes infinite loops and other problems.
44 with System.Tasking.Debug;
45 -- used for Known_Tasks
47 with System.Task_Info;
48 -- used for Task_Info_Type
54 with System.Interrupt_Management;
55 -- used for Keep_Unmasked
56 -- Abort_Task_Interrupt
59 with System.Interrupt_Management.Operations;
60 -- used for Set_Interrupt_Mask
62 pragma Elaborate_All (System.Interrupt_Management.Operations);
64 with System.Parameters;
68 -- used for Ada_Task_Control_Block
71 with System.Soft_Links;
72 -- used for Defer/Undefer_Abort
74 -- Note that we do not use System.Tasking.Initialization directly since
75 -- this is a higher level package that we shouldn't depend on. For example
76 -- when using the restricted run time, it is replaced by
77 -- System.Tasking.Restricted.Stages.
79 with System.OS_Primitives;
80 -- used for Delay_Modes
82 with Unchecked_Deallocation;
84 package body System.Task_Primitives.Operations is
86 use System.Tasking.Debug;
89 use System.OS_Interface;
90 use System.Parameters;
91 use System.OS_Primitives;
93 package SSL renames System.Soft_Links;
99 -- The followings are logically constants, but need to be initialized
102 Single_RTS_Lock : aliased RTS_Lock;
103 -- This is a lock to allow only one thread of control in the RTS at
104 -- a time; it is used to execute in mutual exclusion from all other tasks.
105 -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
107 ATCB_Key : aliased pthread_key_t;
108 -- Key used to find the Ada Task_Id associated with a thread
110 Environment_Task_Id : Task_Id;
111 -- A variable to hold Task_Id for the environment task.
113 Locking_Policy : Character;
114 pragma Import (C, Locking_Policy, "__gl_locking_policy");
115 -- Value of the pragma Locking_Policy:
116 -- 'C' for Ceiling_Locking
117 -- 'I' for Inherit_Locking
120 Unblocked_Signal_Mask : aliased sigset_t;
121 -- The set of signals that should unblocked in all tasks
123 -- The followings are internal configuration constants needed.
125 Next_Serial_Number : Task_Serial_Number := 100;
126 -- We start at 100, to reserve some special values for
127 -- using in error checking.
129 Time_Slice_Val : Integer;
130 pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
132 Dispatching_Policy : Character;
133 pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
135 FIFO_Within_Priorities : constant Boolean := Dispatching_Policy = 'F';
136 -- Indicates whether FIFO_Within_Priorities is set.
138 Foreign_Task_Elaborated : aliased Boolean := True;
139 -- Used to identified fake tasks (i.e., non-Ada Threads).
147 procedure Initialize (Environment_Task : Task_Id);
148 pragma Inline (Initialize);
149 -- Initialize various data needed by this package.
151 function Is_Valid_Task return Boolean;
152 pragma Inline (Is_Valid_Task);
153 -- Does the current thread have an ATCB?
155 procedure Set (Self_Id : Task_Id);
157 -- Set the self id for the current task.
159 function Self return Task_Id;
160 pragma Inline (Self);
161 -- Return a pointer to the Ada Task Control Block of the calling task.
165 package body Specific is separate;
166 -- The body of this package is target specific.
168 ---------------------------------
169 -- Support for foreign threads --
170 ---------------------------------
172 function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
173 -- Allocate and Initialize a new ATCB for the current Thread.
175 function Register_Foreign_Thread
176 (Thread : Thread_Id) return Task_Id is separate;
178 -----------------------
179 -- Local Subprograms --
180 -----------------------
182 procedure Abort_Handler (Sig : Signal);
183 -- Signal handler used to implement asynchronous abort.
185 procedure Set_OS_Priority (T : Task_Id; Prio : System.Any_Priority);
186 -- This procedure calls the scheduler of the OS to set thread's priority
192 procedure Abort_Handler (Sig : Signal) is
193 pragma Unreferenced (Sig);
195 T : constant Task_Id := Self;
196 Result : Interfaces.C.int;
197 Old_Set : aliased sigset_t;
200 -- It is not safe to raise an exception when using ZCX and the GCC
201 -- exception handling mechanism.
203 if ZCX_By_Default and then GCC_ZCX_Support then
207 if T.Deferral_Level = 0
208 and then T.Pending_ATC_Level < T.ATC_Nesting_Level and then
213 -- Make sure signals used for RTS internal purpose are unmasked
216 pthread_sigmask (SIG_UNBLOCK,
217 Unblocked_Signal_Mask'Unchecked_Access,
218 Old_Set'Unchecked_Access);
219 pragma Assert (Result = 0);
221 raise Standard'Abort_Signal;
229 procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
230 Stack_Base : constant Address := Get_Stack_Base (T.Common.LL.Thread);
231 Guard_Page_Address : Address;
233 Res : Interfaces.C.int;
236 if Stack_Base_Available then
238 -- Compute the guard page address
240 Guard_Page_Address :=
241 Stack_Base - (Stack_Base mod Get_Page_Size) + Get_Page_Size;
244 Res := mprotect (Guard_Page_Address, Get_Page_Size, PROT_ON);
246 Res := mprotect (Guard_Page_Address, Get_Page_Size, PROT_OFF);
249 pragma Assert (Res = 0);
257 function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
259 return T.Common.LL.Thread;
266 function Self return Task_Id renames Specific.Self;
268 ---------------------
269 -- Initialize_Lock --
270 ---------------------
272 procedure Initialize_Lock
273 (Prio : System.Any_Priority;
276 Attributes : aliased pthread_mutexattr_t;
277 Result : Interfaces.C.int;
280 Result := pthread_mutexattr_init (Attributes'Access);
281 pragma Assert (Result = 0 or else Result = ENOMEM);
283 if Result = ENOMEM then
287 if Locking_Policy = 'C' then
291 Result := pthread_mutex_init (L.Mutex'Access, Attributes'Access);
292 pragma Assert (Result = 0 or else Result = ENOMEM);
294 if Result = ENOMEM then
298 Result := pthread_mutexattr_destroy (Attributes'Access);
299 pragma Assert (Result = 0);
302 procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
303 pragma Unreferenced (Level);
305 Attributes : aliased pthread_mutexattr_t;
306 Result : Interfaces.C.int;
309 Result := pthread_mutexattr_init (Attributes'Access);
310 pragma Assert (Result = 0 or else Result = ENOMEM);
312 if Result = ENOMEM then
316 Result := pthread_mutex_init (L, Attributes'Access);
317 pragma Assert (Result = 0 or else Result = ENOMEM);
319 if Result = ENOMEM then
320 Result := pthread_mutexattr_destroy (Attributes'Access);
324 Result := pthread_mutexattr_destroy (Attributes'Access);
325 pragma Assert (Result = 0);
332 procedure Finalize_Lock (L : access Lock) is
333 Result : Interfaces.C.int;
335 Result := pthread_mutex_destroy (L.Mutex'Access);
336 pragma Assert (Result = 0);
339 procedure Finalize_Lock (L : access RTS_Lock) is
340 Result : Interfaces.C.int;
342 Result := pthread_mutex_destroy (L);
343 pragma Assert (Result = 0);
350 procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
351 Result : Interfaces.C.int;
352 T : constant Task_Id := Self;
355 if Locking_Policy = 'C' then
356 if T.Common.Current_Priority > L.Ceiling then
357 Ceiling_Violation := True;
361 L.Saved_Priority := T.Common.Current_Priority;
363 if T.Common.Current_Priority < L.Ceiling then
364 Set_OS_Priority (T, L.Ceiling);
368 Result := pthread_mutex_lock (L.Mutex'Access);
370 -- Assume that the cause of EINVAL is a priority ceiling violation
372 Ceiling_Violation := (Result = EINVAL);
373 pragma Assert (Result = 0 or else Result = EINVAL);
376 -- No tricks on RTS_Locks
379 (L : access RTS_Lock; Global_Lock : Boolean := False)
381 Result : Interfaces.C.int;
383 if not Single_Lock or else Global_Lock then
384 Result := pthread_mutex_lock (L);
385 pragma Assert (Result = 0);
389 procedure Write_Lock (T : Task_Id) is
390 Result : Interfaces.C.int;
392 if not Single_Lock then
393 Result := pthread_mutex_lock (T.Common.LL.L'Access);
394 pragma Assert (Result = 0);
402 procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
404 Write_Lock (L, Ceiling_Violation);
411 procedure Unlock (L : access Lock) is
412 Result : Interfaces.C.int;
413 T : constant Task_Id := Self;
416 Result := pthread_mutex_unlock (L.Mutex'Access);
417 pragma Assert (Result = 0);
419 if Locking_Policy = 'C' then
420 if T.Common.Current_Priority > L.Saved_Priority then
421 Set_OS_Priority (T, L.Saved_Priority);
426 procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
427 Result : Interfaces.C.int;
429 if not Single_Lock or else Global_Lock then
430 Result := pthread_mutex_unlock (L);
431 pragma Assert (Result = 0);
435 procedure Unlock (T : Task_Id) is
436 Result : Interfaces.C.int;
438 if not Single_Lock then
439 Result := pthread_mutex_unlock (T.Common.LL.L'Access);
440 pragma Assert (Result = 0);
450 Reason : System.Tasking.Task_States)
452 pragma Unreferenced (Reason);
453 Result : Interfaces.C.int;
457 Result := pthread_cond_wait
458 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
460 Result := pthread_cond_wait
461 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
464 -- EINTR is not considered a failure
466 pragma Assert (Result = 0 or else Result = EINTR);
473 -- This is for use within the run-time system, so abort is
474 -- assumed to be already deferred, and the caller should be
475 -- holding its own ATCB lock.
477 procedure Timed_Sleep
480 Mode : ST.Delay_Modes;
481 Reason : Task_States;
482 Timedout : out Boolean;
483 Yielded : out Boolean)
485 pragma Unreferenced (Reason);
487 Check_Time : constant Duration := Monotonic_Clock;
490 Request : aliased timespec;
491 Result : Interfaces.C.int;
497 if Mode = Relative then
498 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
500 if Relative_Timed_Wait then
501 Rel_Time := Duration'Min (Max_Sensible_Delay, Time);
505 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
507 if Relative_Timed_Wait then
508 Rel_Time := Duration'Min (Max_Sensible_Delay, Time - Check_Time);
512 if Abs_Time > Check_Time then
513 if Relative_Timed_Wait then
514 Request := To_Timespec (Rel_Time);
516 Request := To_Timespec (Abs_Time);
520 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
521 or else Self_ID.Pending_Priority_Change;
524 Result := pthread_cond_timedwait
525 (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access,
529 Result := pthread_cond_timedwait
530 (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
534 exit when Abs_Time <= Monotonic_Clock;
536 if Result = 0 or Result = EINTR then
538 -- Somebody may have called Wakeup for us
544 pragma Assert (Result = ETIMEDOUT);
553 -- This is for use in implementing delay statements, so we assume
554 -- the caller is abort-deferred but is holding no locks.
556 procedure Timed_Delay
559 Mode : ST.Delay_Modes)
561 Check_Time : constant Duration := Monotonic_Clock;
564 Request : aliased timespec;
565 Result : Interfaces.C.int;
568 -- Only the little window between deferring abort and
569 -- locking Self_ID is the reason we need to
570 -- check for pending abort and priority change below!
578 -- Comments needed in code below ???
580 Write_Lock (Self_ID);
582 if Mode = Relative then
583 Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time;
585 if Relative_Timed_Wait then
586 Rel_Time := Duration'Min (Max_Sensible_Delay, Time);
590 Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time);
592 if Relative_Timed_Wait then
593 Rel_Time := Duration'Min (Max_Sensible_Delay, Time - Check_Time);
597 if Abs_Time > Check_Time then
598 if Relative_Timed_Wait then
599 Request := To_Timespec (Rel_Time);
601 Request := To_Timespec (Abs_Time);
604 Self_ID.Common.State := Delay_Sleep;
607 if Self_ID.Pending_Priority_Change then
608 Self_ID.Pending_Priority_Change := False;
609 Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
610 Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
613 exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
616 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
617 Single_RTS_Lock'Access, Request'Access);
619 Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
620 Self_ID.Common.LL.L'Access, Request'Access);
623 exit when Abs_Time <= Monotonic_Clock;
625 pragma Assert (Result = 0
626 or else Result = ETIMEDOUT
627 or else Result = EINTR);
630 Self_ID.Common.State := Runnable;
639 Result := sched_yield;
640 SSL.Abort_Undefer.all;
643 ---------------------
644 -- Monotonic_Clock --
645 ---------------------
647 function Monotonic_Clock return Duration is
648 TS : aliased timespec;
649 Result : Interfaces.C.int;
651 Result := clock_gettime
652 (clock_id => CLOCK_REALTIME, tp => TS'Unchecked_Access);
653 pragma Assert (Result = 0);
654 return To_Duration (TS);
661 function RT_Resolution return Duration is
662 Res : aliased timespec;
663 Result : Interfaces.C.int;
665 Result := clock_getres
666 (clock_id => CLOCK_REALTIME, Res => Res'Unchecked_Access);
667 pragma Assert (Result = 0);
668 return To_Duration (Res);
675 procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
676 pragma Unreferenced (Reason);
677 Result : Interfaces.C.int;
679 Result := pthread_cond_signal (T.Common.LL.CV'Access);
680 pragma Assert (Result = 0);
687 procedure Yield (Do_Yield : Boolean := True) is
688 Result : Interfaces.C.int;
689 pragma Unreferenced (Result);
692 Result := sched_yield;
700 procedure Set_OS_Priority (T : Task_Id; Prio : System.Any_Priority) is
701 Result : Interfaces.C.int;
702 Param : aliased struct_sched_param;
705 Param.sched_priority := Interfaces.C.int (Prio);
707 if Time_Slice_Supported and then Time_Slice_Val > 0 then
708 Result := pthread_setschedparam
709 (T.Common.LL.Thread, SCHED_RR, Param'Access);
711 elsif FIFO_Within_Priorities or else Time_Slice_Val = 0 then
712 Result := pthread_setschedparam
713 (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
716 Result := pthread_setschedparam
717 (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
720 pragma Assert (Result = 0);
723 type Prio_Array_Type is array (System.Any_Priority) of Integer;
724 pragma Atomic_Components (Prio_Array_Type);
725 Prio_Array : Prio_Array_Type;
726 -- Comments needed for these declarations ???
728 procedure Set_Priority
730 Prio : System.Any_Priority;
731 Loss_Of_Inheritance : Boolean := False)
733 Array_Item : Integer;
736 Set_OS_Priority (T, Prio);
738 if Locking_Policy = 'C' then
739 -- Annex D requirements: loss of inheritance puts task at the
740 -- beginning of the queue for that prio; copied from 5ztaprop
743 if Loss_Of_Inheritance
744 and then Prio < T.Common.Current_Priority then
746 Array_Item := Prio_Array (T.Common.Base_Priority) + 1;
747 Prio_Array (T.Common.Base_Priority) := Array_Item;
751 exit when Array_Item = Prio_Array (T.Common.Base_Priority)
752 or else Prio_Array (T.Common.Base_Priority) = 1;
755 Prio_Array (T.Common.Base_Priority) :=
756 Prio_Array (T.Common.Base_Priority) - 1;
760 T.Common.Current_Priority := Prio;
767 function Get_Priority (T : Task_Id) return System.Any_Priority is
769 return T.Common.Current_Priority;
776 procedure Enter_Task (Self_ID : Task_Id) is
778 Self_ID.Common.LL.Thread := pthread_self;
779 Self_ID.Common.LL.LWP := lwp_self;
781 Specific.Set (Self_ID);
785 for J in Known_Tasks'Range loop
786 if Known_Tasks (J) = null then
787 Known_Tasks (J) := Self_ID;
788 Self_ID.Known_Tasks_Index := J;
800 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
802 return new Ada_Task_Control_Block (Entry_Num);
809 function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
811 -----------------------------
812 -- Register_Foreign_Thread --
813 -----------------------------
815 function Register_Foreign_Thread return Task_Id is
817 if Is_Valid_Task then
820 return Register_Foreign_Thread (pthread_self);
822 end Register_Foreign_Thread;
828 procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
829 Mutex_Attr : aliased pthread_mutexattr_t;
830 Result : Interfaces.C.int;
831 Cond_Attr : aliased pthread_condattr_t;
834 -- Give the task a unique serial number
836 Self_ID.Serial_Number := Next_Serial_Number;
837 Next_Serial_Number := Next_Serial_Number + 1;
838 pragma Assert (Next_Serial_Number /= 0);
840 if not Single_Lock then
841 Result := pthread_mutexattr_init (Mutex_Attr'Access);
842 pragma Assert (Result = 0 or else Result = ENOMEM);
845 Result := pthread_mutex_init (Self_ID.Common.LL.L'Access,
847 pragma Assert (Result = 0 or else Result = ENOMEM);
855 Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
856 pragma Assert (Result = 0);
859 Result := pthread_condattr_init (Cond_Attr'Access);
860 pragma Assert (Result = 0 or else Result = ENOMEM);
863 Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
865 pragma Assert (Result = 0 or else Result = ENOMEM);
871 if not Single_Lock then
872 Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
873 pragma Assert (Result = 0);
879 Result := pthread_condattr_destroy (Cond_Attr'Access);
880 pragma Assert (Result = 0);
887 procedure Create_Task
889 Wrapper : System.Address;
890 Stack_Size : System.Parameters.Size_Type;
891 Priority : System.Any_Priority;
892 Succeeded : out Boolean)
894 Attributes : aliased pthread_attr_t;
895 Adjusted_Stack_Size : Interfaces.C.size_t;
896 Result : Interfaces.C.int;
898 use System.Task_Info;
901 if Stack_Size = Unspecified_Size then
902 Adjusted_Stack_Size := Interfaces.C.size_t (Default_Stack_Size);
904 elsif Stack_Size < Minimum_Stack_Size then
905 Adjusted_Stack_Size := Interfaces.C.size_t (Minimum_Stack_Size);
908 Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
911 if Stack_Base_Available then
913 -- If Stack Checking is supported then allocate 2 additional pages:
915 -- In the worst case, stack is allocated at something like
916 -- N * Get_Page_Size - epsilon, we need to add the size for 2 pages
917 -- to be sure the effective stack size is greater than what
920 Adjusted_Stack_Size := Adjusted_Stack_Size + 2 * Get_Page_Size;
923 Result := pthread_attr_init (Attributes'Access);
924 pragma Assert (Result = 0 or else Result = ENOMEM);
931 Result := pthread_attr_setdetachstate
932 (Attributes'Access, PTHREAD_CREATE_DETACHED);
933 pragma Assert (Result = 0);
935 Result := pthread_attr_setstacksize
936 (Attributes'Access, Adjusted_Stack_Size);
937 pragma Assert (Result = 0);
939 if T.Common.Task_Info /= Default_Scope then
941 -- We are assuming that Scope_Type has the same values than the
942 -- corresponding C macros
944 Result := pthread_attr_setscope
945 (Attributes'Access, Task_Info_Type'Pos (T.Common.Task_Info));
946 pragma Assert (Result = 0);
949 -- Since the initial signal mask of a thread is inherited from the
950 -- creator, and the Environment task has all its signals masked, we
951 -- do not need to manipulate caller's signal mask at this point.
952 -- All tasks in RTS will have All_Tasks_Mask initially.
954 Result := pthread_create
955 (T.Common.LL.Thread'Access,
957 Thread_Body_Access (Wrapper),
959 pragma Assert (Result = 0 or else Result = EAGAIN);
961 Succeeded := Result = 0;
963 Result := pthread_attr_destroy (Attributes'Access);
964 pragma Assert (Result = 0);
966 Set_Priority (T, Priority);
973 procedure Finalize_TCB (T : Task_Id) is
974 Result : Interfaces.C.int;
976 Is_Self : constant Boolean := T = Self;
978 procedure Free is new
979 Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
982 if not Single_Lock then
983 Result := pthread_mutex_destroy (T.Common.LL.L'Access);
984 pragma Assert (Result = 0);
987 Result := pthread_cond_destroy (T.Common.LL.CV'Access);
988 pragma Assert (Result = 0);
990 if T.Known_Tasks_Index /= -1 then
991 Known_Tasks (T.Known_Tasks_Index) := null;
997 Result := st_setspecific (ATCB_Key, System.Null_Address);
998 pragma Assert (Result = 0);
1007 procedure Exit_Task is
1009 Specific.Set (null);
1016 procedure Abort_Task (T : Task_Id) is
1017 Result : Interfaces.C.int;
1021 (T.Common.LL.Thread,
1022 Signal (System.Interrupt_Management.Abort_Task_Interrupt));
1023 pragma Assert (Result = 0);
1032 function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
1033 pragma Unreferenced (Self_ID);
1038 --------------------
1039 -- Check_No_Locks --
1040 --------------------
1042 function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
1043 pragma Unreferenced (Self_ID);
1048 ----------------------
1049 -- Environment_Task --
1050 ----------------------
1052 function Environment_Task return Task_Id is
1054 return Environment_Task_Id;
1055 end Environment_Task;
1061 procedure Lock_RTS is
1063 Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
1070 procedure Unlock_RTS is
1072 Unlock (Single_RTS_Lock'Access, Global_Lock => True);
1079 function Suspend_Task
1081 Thread_Self : Thread_Id) return Boolean
1083 pragma Unreferenced (T);
1084 pragma Unreferenced (Thread_Self);
1093 function Resume_Task
1095 Thread_Self : Thread_Id) return Boolean
1097 pragma Unreferenced (T);
1098 pragma Unreferenced (Thread_Self);
1107 procedure Initialize (Environment_Task : Task_Id) is
1108 act : aliased struct_sigaction;
1109 old_act : aliased struct_sigaction;
1110 Tmp_Set : aliased sigset_t;
1111 Result : Interfaces.C.int;
1114 (Int : System.Interrupt_Management.Interrupt_ID) return Character;
1115 pragma Import (C, State, "__gnat_get_interrupt_state");
1116 -- Get interrupt state. Defined in a-init.c
1117 -- The input argument is the interrupt number,
1118 -- and the result is one of the following:
1120 Default : constant Character := 's';
1121 -- 'n' this interrupt not set by any Interrupt_State pragma
1122 -- 'u' Interrupt_State pragma set state to User
1123 -- 'r' Interrupt_State pragma set state to Runtime
1124 -- 's' Interrupt_State pragma set state to System (use "default"
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 Specific.Initialize (Environment_Task);
1136 Enter_Task (Environment_Task);
1138 -- Install the abort-signal handler
1140 if State (System.Interrupt_Management.Abort_Task_Interrupt)
1144 act.sa_handler := Abort_Handler'Address;
1146 Result := sigemptyset (Tmp_Set'Access);
1147 pragma Assert (Result = 0);
1148 act.sa_mask := Tmp_Set;
1152 (Signal (System.Interrupt_Management.Abort_Task_Interrupt),
1153 act'Unchecked_Access,
1154 old_act'Unchecked_Access);
1156 pragma Assert (Result = 0);
1162 Result : Interfaces.C.int;
1165 -- Mask Environment task for all signals. The original mask of the
1166 -- Environment task will be recovered by Interrupt_Server task
1167 -- during the elaboration of s-interr.adb.
1169 System.Interrupt_Management.Operations.Set_Interrupt_Mask
1170 (System.Interrupt_Management.Operations.All_Tasks_Mask'Access);
1172 -- Prepare the set of signals that should unblocked in all tasks
1174 Result := sigemptyset (Unblocked_Signal_Mask'Access);
1175 pragma Assert (Result = 0);
1177 for J in Interrupt_Management.Interrupt_ID loop
1178 if System.Interrupt_Management.Keep_Unmasked (J) then
1179 Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
1180 pragma Assert (Result = 0);
1184 end System.Task_Primitives.Operations;