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* arm.md (reload_mulsi3, reload_mulsi_compare0, reload_muladdsi)
[official-gcc.git] / gcc / ada / s-interr.adb
blob432c1bfe9a686efd1a40e090585806a9338463b3
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
4 -- --
5 -- S Y S T E M . I N T E R R U P T S --
6 -- --
7 -- B o d y --
8 -- --
9 -- --
10 -- Copyright (C) 1992-2002, Free Software Foundation, Inc. --
11 -- --
12 -- GNARL is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNARL; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
22 -- --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
29 -- --
30 -- GNARL was developed by the GNARL team at Florida State University. It is --
31 -- now maintained by Ada Core Technologies, Inc. (http://www.gnat.com). --
32 -- --
33 ------------------------------------------------------------------------------
34
35 -- Invariants:
36
37 -- All user-handleable interrupts are masked at all times in all
38 -- tasks/threads except possibly for the Interrupt_Manager task.
39
40 -- When a user task wants to have the effect of masking/unmasking an
41 -- interrupt, it must call Block_Interrupt/Unblock_Interrupt, which
42 -- will have the effect of unmasking/masking the interrupt in the
43 -- Interrupt_Manager task.
44
45 -- Note : Direct calls to sigaction, sigprocmask, pthread_sigsetmask or any
46 -- other low-level interface that changes the interrupt action or
47 -- interrupt mask needs a careful thought.
48 -- One may acheive the effect of system calls first masking RTS blocked
49 -- (by calling Block_Interrupt) for the interrupt under consideration.
50 -- This will make all the tasks in RTS blocked for the Interrupt.
51
52 -- Once we associate a Server_Task with an interrupt, the task never
53 -- goes away, and we never remove the association.
54
55 -- There is no more than one interrupt per Server_Task and no more than
56 -- one Server_Task per interrupt.
57
58 with Ada.Task_Identification;
59 -- used for Task_ID type
60
61 with Ada.Exceptions;
62 -- used for Raise_Exception
63
64 with System.Task_Primitives;
65 -- used for RTS_Lock
66 -- Self
67
68 with System.Interrupt_Management;
69 -- used for Reserve
70 -- Interrupt_ID
71 -- Interrupt_Mask
72 -- Abort_Task_Interrupt
73
74 with System.Interrupt_Management.Operations;
75 -- used for Thread_Block_Interrupt
76 -- Thread_Unblock_Interrupt
77 -- Install_Default_Action
78 -- Install_Ignore_Action
79 -- Copy_Interrupt_Mask
80 -- Set_Interrupt_Mask
81 -- Empty_Interrupt_Mask
82 -- Fill_Interrupt_Mask
83 -- Add_To_Interrupt_Mask
84 -- Delete_From_Interrupt_Mask
85 -- Interrupt_Wait
86 -- Interrupt_Self_Process
87 -- Get_Interrupt_Mask
88 -- Set_Interrupt_Mask
89 -- IS_Member
90 -- Environment_Mask
91 -- All_Tasks_Mask
92 pragma Elaborate_All (System.Interrupt_Management.Operations);
93
94 with System.Task_Primitives.Operations;
95 -- used for Write_Lock
96 -- Unlock
97 -- Abort
98 -- Wakeup_Task
99 -- Sleep
100 -- Initialize_Lock
101
102 with System.Task_Primitives.Interrupt_Operations;
103 -- used for Set_Interrupt_ID
104
105 with System.Storage_Elements;
106 -- used for To_Address
107 -- To_Integer
108 -- Integer_Address
109
110 with System.Tasking;
111 -- used for Task_ID
112 -- Task_Entry_Index
113 -- Null_Task
114 -- Self
115 -- Interrupt_Manager_ID
116
117 with System.Tasking.Utilities;
118 -- used for Make_Independent
119
120 with System.Tasking.Rendezvous;
121 -- used for Call_Simple
122 pragma Elaborate_All (System.Tasking.Rendezvous);
123
124 with System.Tasking.Initialization;
125 -- used for Defer_Abort
126 -- Undefer_Abort
127
128 with System.Parameters;
129 -- used for Single_Lock
130
131 with Unchecked_Conversion;
132
133 package body System.Interrupts is
134
135 use Parameters;
136 use Tasking;
137 use Ada.Exceptions;
138
139 package PRI renames System.Task_Primitives;
140 package POP renames System.Task_Primitives.Operations;
141 package PIO renames System.Task_Primitives.Interrupt_Operations;
142 package IMNG renames System.Interrupt_Management;
143 package IMOP renames System.Interrupt_Management.Operations;
144
145 function To_System is new Unchecked_Conversion
146 (Ada.Task_Identification.Task_Id, Task_ID);
147
148 -----------------
149 -- Local Tasks --
150 -----------------
151
152 -- WARNING: System.Tasking.Stages performs calls to this task
153 -- with low-level constructs. Do not change this spec without synchro-
154 -- nizing it.
155
156 task Interrupt_Manager is
157 entry Detach_Interrupt_Entries (T : Task_ID);
158
159 entry Initialize (Mask : IMNG.Interrupt_Mask);
160
161 entry Attach_Handler
162 (New_Handler : in Parameterless_Handler;
163 Interrupt : in Interrupt_ID;
164 Static : in Boolean;
165 Restoration : in Boolean := False);
166
167 entry Exchange_Handler
168 (Old_Handler : out Parameterless_Handler;
169 New_Handler : in Parameterless_Handler;
170 Interrupt : in Interrupt_ID;
171 Static : in Boolean);
172
173 entry Detach_Handler
174 (Interrupt : in Interrupt_ID;
175 Static : in Boolean);
176
177 entry Bind_Interrupt_To_Entry
178 (T : Task_ID;
179 E : Task_Entry_Index;
180 Interrupt : Interrupt_ID);
181
182 entry Block_Interrupt (Interrupt : Interrupt_ID);
183
184 entry Unblock_Interrupt (Interrupt : Interrupt_ID);
185
186 entry Ignore_Interrupt (Interrupt : Interrupt_ID);
187
188 entry Unignore_Interrupt (Interrupt : Interrupt_ID);
189
190 pragma Interrupt_Priority (System.Interrupt_Priority'Last);
191 end Interrupt_Manager;
192
193 task type Server_Task (Interrupt : Interrupt_ID) is
194 pragma Priority (System.Interrupt_Priority'Last);
195 end Server_Task;
196
197 type Server_Task_Access is access Server_Task;
198
199 -------------------------------
200 -- Local Types and Variables --
201 -------------------------------
202
203 type Entry_Assoc is record
204 T : Task_ID;
205 E : Task_Entry_Index;
206 end record;
207
208 type Handler_Assoc is record
209 H : Parameterless_Handler;
210 Static : Boolean; -- Indicates static binding;
211 end record;
212
213 User_Handler : array (Interrupt_ID'Range) of Handler_Assoc :=
214 (others => (null, Static => False));
215 pragma Volatile_Components (User_Handler);
216 -- Holds the protected procedure handler (if any) and its Static
217 -- information for each interrupt. A handler is a Static one if
218 -- it is specified through the pragma Attach_Handler.
219 -- Attach_Handler. Otherwise, not static)
220
221 User_Entry : array (Interrupt_ID'Range) of Entry_Assoc :=
222 (others => (T => Null_Task, E => Null_Task_Entry));
223 pragma Volatile_Components (User_Entry);
224 -- Holds the task and entry index (if any) for each interrupt
225
226 Blocked : array (Interrupt_ID'Range) of Boolean := (others => False);
227 pragma Volatile_Components (Blocked);
228 -- True iff the corresponding interrupt is blocked in the process level
229
230 Ignored : array (Interrupt_ID'Range) of Boolean := (others => False);
231 pragma Volatile_Components (Ignored);
232 -- True iff the corresponding interrupt is blocked in the process level
233
234 Last_Unblocker :
235 array (Interrupt_ID'Range) of Task_ID := (others => Null_Task);
236 pragma Volatile_Components (Last_Unblocker);
237 -- Holds the ID of the last Task which Unblocked this Interrupt.
238 -- It contains Null_Task if no tasks have ever requested the
239 -- Unblocking operation or the Interrupt is currently Blocked.
240
241 Server_ID : array (Interrupt_ID'Range) of Task_ID :=
242 (others => Null_Task);
243 pragma Atomic_Components (Server_ID);
244 -- Holds the Task_ID of the Server_Task for each interrupt.
245 -- Task_ID is needed to accomplish locking per Interrupt base. Also
246 -- is needed to decide whether to create a new Server_Task.
247
248 -- Type and Head, Tail of the list containing Registered Interrupt
249 -- Handlers. These definitions are used to register the handlers
250 -- specified by the pragma Interrupt_Handler.
251
252 type Registered_Handler;
253 type R_Link is access all Registered_Handler;
254
255 type Registered_Handler is record
256 H : System.Address := System.Null_Address;
257 Next : R_Link := null;
258 end record;
259
260 Registered_Handler_Head : R_Link := null;
261 Registered_Handler_Tail : R_Link := null;
262
263 Access_Hold : Server_Task_Access;
264 -- variable used to allocate Server_Task using "new".
265
266 -----------------------
267 -- Local Subprograms --
268 -----------------------
269
270 function Is_Registered (Handler : Parameterless_Handler) return Boolean;
271 -- See if the Handler has been "pragma"ed using Interrupt_Handler.
272 -- Always consider a null handler as registered.
273
274 --------------------
275 -- Attach_Handler --
276 --------------------
277
278 -- Calling this procedure with New_Handler = null and Static = True
279 -- means we want to detach the current handler regardless of the
280 -- previous handler's binding status (ie. do not care if it is a
281 -- dynamic or static handler).
282
283 -- This option is needed so that during the finalization of a PO, we
284 -- can detach handlers attached through pragma Attach_Handler.
285
286 procedure Attach_Handler
287 (New_Handler : in Parameterless_Handler;
288 Interrupt : in Interrupt_ID;
289 Static : in Boolean := False)
290 is
291 begin
292 if Is_Reserved (Interrupt) then
293 Raise_Exception (Program_Error'Identity, "Interrupt" &
294 Interrupt_ID'Image (Interrupt) & " is reserved");
295 end if;
296
297 Interrupt_Manager.Attach_Handler (New_Handler, Interrupt, Static);
298
299 end Attach_Handler;
300
301 -----------------------------
302 -- Bind_Interrupt_To_Entry --
303 -----------------------------
304
305 -- This procedure raises a Program_Error if it tries to
306 -- bind an interrupt to which an Entry or a Procedure is
307 -- already bound.
308
309 procedure Bind_Interrupt_To_Entry
310 (T : Task_ID;
311 E : Task_Entry_Index;
312 Int_Ref : System.Address)
313 is
314 Interrupt : constant Interrupt_ID :=
315 Interrupt_ID (Storage_Elements.To_Integer (Int_Ref));
316
317 begin
318 if Is_Reserved (Interrupt) then
319 Raise_Exception (Program_Error'Identity, "Interrupt" &
320 Interrupt_ID'Image (Interrupt) & " is reserved");
321 end if;
322
323 Interrupt_Manager.Bind_Interrupt_To_Entry (T, E, Interrupt);
324
325 end Bind_Interrupt_To_Entry;
326
327 ---------------------
328 -- Block_Interrupt --
329 ---------------------
330
331 procedure Block_Interrupt (Interrupt : Interrupt_ID) is
332 begin
333 if Is_Reserved (Interrupt) then
334 Raise_Exception (Program_Error'Identity, "Interrupt" &
335 Interrupt_ID'Image (Interrupt) & " is reserved");
336 end if;
337
338 Interrupt_Manager.Block_Interrupt (Interrupt);
339 end Block_Interrupt;
340
341 ---------------------
342 -- Current_Handler --
343 ---------------------
344
345 function Current_Handler
346 (Interrupt : Interrupt_ID)
347 return Parameterless_Handler
348 is
349 begin
350 if Is_Reserved (Interrupt) then
351 Raise_Exception (Program_Error'Identity, "Interrupt" &
352 Interrupt_ID'Image (Interrupt) & " is reserved");
353 end if;
354
355 -- ??? Since Parameterless_Handler is not Atomic, the
356 -- current implementation is wrong. We need a new service in
357 -- Interrupt_Manager to ensure atomicity.
358
359 return User_Handler (Interrupt).H;
360 end Current_Handler;
361
362 --------------------
363 -- Detach_Handler --
364 --------------------
365
366 -- Calling this procedure with Static = True means we want to Detach the
367 -- current handler regardless of the previous handler's binding status
368 -- (i.e. do not care if it is a dynamic or static handler).
369
370 -- This option is needed so that during the finalization of a PO, we can
371 -- detach handlers attached through pragma Attach_Handler.
372
373 procedure Detach_Handler
374 (Interrupt : in Interrupt_ID;
375 Static : in Boolean := False)
376 is
377 begin
378 if Is_Reserved (Interrupt) then
379 Raise_Exception (Program_Error'Identity, "Interrupt" &
380 Interrupt_ID'Image (Interrupt) & " is reserved");
381 end if;
382
383 Interrupt_Manager.Detach_Handler (Interrupt, Static);
384
385 end Detach_Handler;
386
387 ------------------------------
388 -- Detach_Interrupt_Entries --
389 ------------------------------
390
391 procedure Detach_Interrupt_Entries (T : Task_ID) is
392 begin
393 Interrupt_Manager.Detach_Interrupt_Entries (T);
394 end Detach_Interrupt_Entries;
395
396 ----------------------
397 -- Exchange_Handler --
398 ----------------------
399
400 -- Calling this procedure with New_Handler = null and Static = True
401 -- means we want to detach the current handler regardless of the
402 -- previous handler's binding status (ie. do not care if it is a
403 -- dynamic or static handler).
404
405 -- This option is needed so that during the finalization of a PO, we
406 -- can detach handlers attached through pragma Attach_Handler.
407
408 procedure Exchange_Handler
409 (Old_Handler : out Parameterless_Handler;
410 New_Handler : in Parameterless_Handler;
411 Interrupt : in Interrupt_ID;
412 Static : in Boolean := False)
413 is
414 begin
415 if Is_Reserved (Interrupt) then
416 Raise_Exception (Program_Error'Identity, "Interrupt" &
417 Interrupt_ID'Image (Interrupt) & " is reserved");
418 end if;
419
420 Interrupt_Manager.Exchange_Handler
421 (Old_Handler, New_Handler, Interrupt, Static);
422
423 end Exchange_Handler;
424
425 ----------------
426 -- Finalize --
427 ----------------
428
429 procedure Finalize (Object : in out Static_Interrupt_Protection) is
430 begin
431 -- ??? loop to be executed only when we're not doing library level
432 -- finalization, since in this case all interrupt tasks are gone.
433 if not Interrupt_Manager'Terminated then
434 for N in reverse Object.Previous_Handlers'Range loop
435 Interrupt_Manager.Attach_Handler
436 (New_Handler => Object.Previous_Handlers (N).Handler,
437 Interrupt => Object.Previous_Handlers (N).Interrupt,
438 Static => Object.Previous_Handlers (N).Static,
439 Restoration => True);
440 end loop;
441 end if;
442
443 Tasking.Protected_Objects.Entries.Finalize
444 (Tasking.Protected_Objects.Entries.Protection_Entries (Object));
445 end Finalize;
446
447 -------------------------------------
448 -- Has_Interrupt_Or_Attach_Handler --
449 -------------------------------------
450
451 function Has_Interrupt_Or_Attach_Handler
452 (Object : access Dynamic_Interrupt_Protection) return Boolean is
453 begin
454 return True;
455 end Has_Interrupt_Or_Attach_Handler;
456
457 function Has_Interrupt_Or_Attach_Handler
458 (Object : access Static_Interrupt_Protection)
459 return Boolean
460 is
461 begin
462 return True;
463 end Has_Interrupt_Or_Attach_Handler;
464
465 ----------------------
466 -- Ignore_Interrupt --
467 ----------------------
468
469 procedure Ignore_Interrupt (Interrupt : Interrupt_ID) is
470 begin
471 if Is_Reserved (Interrupt) then
472 Raise_Exception (Program_Error'Identity, "Interrupt" &
473 Interrupt_ID'Image (Interrupt) & " is reserved");
474 end if;
475
476 Interrupt_Manager.Ignore_Interrupt (Interrupt);
477 end Ignore_Interrupt;
478
479 ----------------------
480 -- Install_Handlers --
481 ----------------------
482
483 procedure Install_Handlers
484 (Object : access Static_Interrupt_Protection;
485 New_Handlers : in New_Handler_Array)
486 is
487 begin
488 for N in New_Handlers'Range loop
489
490 -- We need a lock around this ???
491
492 Object.Previous_Handlers (N).Interrupt := New_Handlers (N).Interrupt;
493 Object.Previous_Handlers (N).Static := User_Handler
494 (New_Handlers (N).Interrupt).Static;
495
496 -- We call Exchange_Handler and not directly Interrupt_Manager.
497 -- Exchange_Handler so we get the Is_Reserved check.
498
499 Exchange_Handler
500 (Old_Handler => Object.Previous_Handlers (N).Handler,
501 New_Handler => New_Handlers (N).Handler,
502 Interrupt => New_Handlers (N).Interrupt,
503 Static => True);
504 end loop;
505 end Install_Handlers;
506
507 ----------------
508 -- Is_Blocked --
509 ----------------
510
511 function Is_Blocked (Interrupt : Interrupt_ID) return Boolean is
512 begin
513 if Is_Reserved (Interrupt) then
514 Raise_Exception (Program_Error'Identity, "Interrupt" &
515 Interrupt_ID'Image (Interrupt) & " is reserved");
516 end if;
517
518 return Blocked (Interrupt);
519 end Is_Blocked;
520
521 -----------------------
522 -- Is_Entry_Attached --
523 -----------------------
524
525 function Is_Entry_Attached (Interrupt : Interrupt_ID) return Boolean is
526 begin
527 if Is_Reserved (Interrupt) then
528 Raise_Exception (Program_Error'Identity, "Interrupt" &
529 Interrupt_ID'Image (Interrupt) & " is reserved");
530 end if;
531
532 return User_Entry (Interrupt).T /= Null_Task;
533 end Is_Entry_Attached;
534
535 -------------------------
536 -- Is_Handler_Attached --
537 -------------------------
538
539 function Is_Handler_Attached (Interrupt : Interrupt_ID) return Boolean is
540 begin
541 if Is_Reserved (Interrupt) then
542 Raise_Exception (Program_Error'Identity, "Interrupt" &
543 Interrupt_ID'Image (Interrupt) & " is reserved");
544 end if;
545
546 return User_Handler (Interrupt).H /= null;
547 end Is_Handler_Attached;
548
549 ----------------
550 -- Is_Ignored --
551 ----------------
552
553 function Is_Ignored (Interrupt : Interrupt_ID) return Boolean is
554 begin
555 if Is_Reserved (Interrupt) then
556 Raise_Exception (Program_Error'Identity, "Interrupt" &
557 Interrupt_ID'Image (Interrupt) & " is reserved");
558 end if;
559
560 return Ignored (Interrupt);
561 end Is_Ignored;
562
563 -------------------
564 -- Is_Registered --
565 -------------------
566
567 function Is_Registered (Handler : Parameterless_Handler) return Boolean is
568
569 type Fat_Ptr is record
570 Object_Addr : System.Address;
571 Handler_Addr : System.Address;
572 end record;
573
574 function To_Fat_Ptr is new Unchecked_Conversion
575 (Parameterless_Handler, Fat_Ptr);
576
577 Ptr : R_Link;
578 Fat : Fat_Ptr;
579
580 begin
581 if Handler = null then
582 return True;
583 end if;
584
585 Fat := To_Fat_Ptr (Handler);
586
587 Ptr := Registered_Handler_Head;
588
589 while (Ptr /= null) loop
590 if Ptr.H = Fat.Handler_Addr then
591 return True;
592 end if;
593
594 Ptr := Ptr.Next;
595 end loop;
596
597 return False;
598
599 end Is_Registered;
600
601 -----------------
602 -- Is_Reserved --
603 -----------------
604
605 function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is
606 begin
607 return IMNG.Reserve (IMNG.Interrupt_ID (Interrupt));
608 end Is_Reserved;
609
610 ---------------
611 -- Reference --
612 ---------------
613
614 function Reference (Interrupt : Interrupt_ID) return System.Address is
615 begin
616 if Is_Reserved (Interrupt) then
617 Raise_Exception (Program_Error'Identity, "Interrupt" &
618 Interrupt_ID'Image (Interrupt) & " is reserved");
619 end if;
620
621 return Storage_Elements.To_Address
622 (Storage_Elements.Integer_Address (Interrupt));
623 end Reference;
624
625 ---------------------------------
626 -- Register_Interrupt_Handler --
627 ---------------------------------
628
629 procedure Register_Interrupt_Handler (Handler_Addr : System.Address) is
630 New_Node_Ptr : R_Link;
631
632 begin
633 -- This routine registers the Handler as usable for Dynamic
634 -- Interrupt Handler. Routines attaching and detaching Handler
635 -- dynamically should first consult if the Handler is rgistered.
636 -- A Program Error should be raised if it is not registered.
637
638 -- The pragma Interrupt_Handler can only appear in the library
639 -- level PO definition and instantiation. Therefore, we do not need
640 -- to implement Unregistering operation. Neither we need to
641 -- protect the queue structure using a Lock.
642
643 pragma Assert (Handler_Addr /= System.Null_Address);
644
645 New_Node_Ptr := new Registered_Handler;
646 New_Node_Ptr.H := Handler_Addr;
647
648 if Registered_Handler_Head = null then
649 Registered_Handler_Head := New_Node_Ptr;
650 Registered_Handler_Tail := New_Node_Ptr;
651
652 else
653 Registered_Handler_Tail.Next := New_Node_Ptr;
654 Registered_Handler_Tail := New_Node_Ptr;
655 end if;
656 end Register_Interrupt_Handler;
657
658 -----------------------
659 -- Unblock_Interrupt --
660 -----------------------
661
662 procedure Unblock_Interrupt (Interrupt : Interrupt_ID) is
663 begin
664 if Is_Reserved (Interrupt) then
665 Raise_Exception (Program_Error'Identity, "Interrupt" &
666 Interrupt_ID'Image (Interrupt) & " is reserved");
667 end if;
668
669 Interrupt_Manager.Unblock_Interrupt (Interrupt);
670 end Unblock_Interrupt;
671
672 ------------------
673 -- Unblocked_By --
674 ------------------
675
676 function Unblocked_By
677 (Interrupt : Interrupt_ID)
678 return System.Tasking.Task_ID
679 is
680 begin
681 if Is_Reserved (Interrupt) then
682 Raise_Exception (Program_Error'Identity, "Interrupt" &
683 Interrupt_ID'Image (Interrupt) & " is reserved");
684 end if;
685
686 return Last_Unblocker (Interrupt);
687 end Unblocked_By;
688
689 ------------------------
690 -- Unignore_Interrupt --
691 ------------------------
692
693 procedure Unignore_Interrupt (Interrupt : Interrupt_ID) is
694 begin
695 if Is_Reserved (Interrupt) then
696 Raise_Exception (Program_Error'Identity, "Interrupt" &
697 Interrupt_ID'Image (Interrupt) & " is reserved");
698 end if;
699
700 Interrupt_Manager.Unignore_Interrupt (Interrupt);
701 end Unignore_Interrupt;
702
703 -----------------------
704 -- Interrupt_Manager --
705 -----------------------
706
707 task body Interrupt_Manager is
708
709 ----------------------
710 -- Local Variables --
711 ----------------------
712
713 Intwait_Mask : aliased IMNG.Interrupt_Mask;
714 Ret_Interrupt : Interrupt_ID;
715 Old_Mask : aliased IMNG.Interrupt_Mask;
716 Self_ID : Task_ID := POP.Self;
717 Old_Handler : Parameterless_Handler;
718
719 ---------------------
720 -- Local Routines --
721 ---------------------
722
723 procedure Bind_Handler (Interrupt : Interrupt_ID);
724 -- This procedure does not do anything if the Interrupt is blocked.
725 -- Otherwise, we have to interrupt Server_Task for status change through
726 -- Wakeup interrupt.
727
728 procedure Unbind_Handler (Interrupt : Interrupt_ID);
729 -- This procedure does not do anything if the Interrupt is blocked.
730 -- Otherwise, we have to interrupt Server_Task for status change
731 -- through abort interrupt.
732
733 procedure Unprotected_Exchange_Handler
734 (Old_Handler : out Parameterless_Handler;
735 New_Handler : in Parameterless_Handler;
736 Interrupt : in Interrupt_ID;
737 Static : in Boolean;
738 Restoration : in Boolean := False);
739
740 procedure Unprotected_Detach_Handler
741 (Interrupt : in Interrupt_ID;
742 Static : in Boolean);
743
744 ------------------
745 -- Bind_Handler --
746 ------------------
747
748 procedure Bind_Handler (Interrupt : Interrupt_ID) is
749 begin
750 if not Blocked (Interrupt) then
751
752 -- Mask this task for the given Interrupt so that all tasks
753 -- are masked for the Interrupt and the actuall delivery of the
754 -- Interrupt will be caught using "sigwait" by the
755 -- corresponding Server_Task.
756
757 IMOP.Thread_Block_Interrupt (IMNG.Interrupt_ID (Interrupt));
758
759 -- We have installed a Handler or an Entry before we called
760 -- this procedure. If the Handler Task is waiting to be awakened,
761 -- do it here. Otherwise, the interrupt will be discarded.
762
763 POP.Wakeup (Server_ID (Interrupt), Interrupt_Server_Idle_Sleep);
764 end if;
765 end Bind_Handler;
766
767 --------------------
768 -- Unbind_Handler --
769 --------------------
770
771 procedure Unbind_Handler (Interrupt : Interrupt_ID) is
772 begin
773 if not Blocked (Interrupt) then
774
775 -- Currently, there is a Handler or an Entry attached and
776 -- corresponding Server_Task is waiting on "sigwait."
777 -- We have to wake up the Server_Task and make it
778 -- wait on condition variable by sending an
779 -- Abort_Task_Interrupt
780
781 POP.Abort_Task (Server_ID (Interrupt));
782
783 -- Make sure corresponding Server_Task is out of its own
784 -- sigwait state.
785
786 Ret_Interrupt :=
787 Interrupt_ID (IMOP.Interrupt_Wait (Intwait_Mask'Access));
788
789 pragma Assert
790 (Ret_Interrupt = Interrupt_ID (IMNG.Abort_Task_Interrupt));
791
792 IMOP.Install_Default_Action (IMNG.Interrupt_ID (Interrupt));
793
794 -- Unmake the Interrupt for this task in order to allow default
795 -- action again.
796
797 IMOP.Thread_Unblock_Interrupt (IMNG.Interrupt_ID (Interrupt));
798
799 else
800 IMOP.Install_Default_Action (IMNG.Interrupt_ID (Interrupt));
801 end if;
802
803 end Unbind_Handler;
804
805 --------------------------------
806 -- Unprotected_Detach_Handler --
807 --------------------------------
808
809 procedure Unprotected_Detach_Handler
810 (Interrupt : in Interrupt_ID;
811 Static : in Boolean)
812 is
813 Old_Handler : Parameterless_Handler;
814
815 begin
816 if User_Entry (Interrupt).T /= Null_Task then
817
818 -- In case we have an Interrupt Entry installed.
819 -- raise a program error. (propagate it to the caller).
820
821 Raise_Exception (Program_Error'Identity,
822 "An interrupt entry is already installed");
823 end if;
824
825 -- Note : Static = True will pass the following check. That is the
826 -- case when we want to detach a handler regardless of the static
827 -- status of the current_Handler.
828
829 if not Static and then User_Handler (Interrupt).Static then
830 -- Tries to detach a static Interrupt Handler.
831 -- raise a program error.
832
833 Raise_Exception (Program_Error'Identity,
834 "Trying to detach a static Interrupt Handler");
835 end if;
836
837 -- The interrupt should no longer be ignored if
838 -- it was ever ignored.
839
840 Ignored (Interrupt) := False;
841
842 Old_Handler := User_Handler (Interrupt).H;
843
844 -- The new handler
845
846 User_Handler (Interrupt).H := null;
847 User_Handler (Interrupt).Static := False;
848
849 if Old_Handler /= null then
850 Unbind_Handler (Interrupt);
851 end if;
852
853 end Unprotected_Detach_Handler;
854
855 ----------------------------------
856 -- Unprotected_Exchange_Handler --
857 ----------------------------------
858
859 procedure Unprotected_Exchange_Handler
860 (Old_Handler : out Parameterless_Handler;
861 New_Handler : in Parameterless_Handler;
862 Interrupt : in Interrupt_ID;
863 Static : in Boolean;
864 Restoration : in Boolean := False) is
865 begin
866 if User_Entry (Interrupt).T /= Null_Task then
867 -- In case we have an Interrupt Entry already installed.
868 -- raise a program error. (propagate it to the caller).
869
870 Raise_Exception (Program_Error'Identity,
871 "An interrupt is already installed");
872 end if;
873
874 -- Note : A null handler with Static = True will
875 -- pass the following check. That is the case when we want to
876 -- Detach a handler regardless of the Static status
877 -- of the current_Handler.
878 -- We don't check anything if Restoration is True, since we
879 -- may be detaching a static handler to restore a dynamic one.
880
881 if not Restoration and then not Static
882
883 -- Tries to overwrite a static Interrupt Handler with a
884 -- dynamic Handler
885
886 and then (User_Handler (Interrupt).Static
887
888 -- The new handler is not specified as an
889 -- Interrupt Handler by a pragma.
890
891 or else not Is_Registered (New_Handler))
892 then
893 Raise_Exception (Program_Error'Identity,
894 "Trying to overwrite a static Interrupt Handler with a " &
895 "dynamic Handler");
896 end if;
897
898 -- The interrupt should no longer be ingnored if
899 -- it was ever ignored.
900
901 Ignored (Interrupt) := False;
902
903 -- Save the old handler
904
905 Old_Handler := User_Handler (Interrupt).H;
906
907 -- The new handler
908
909 User_Handler (Interrupt).H := New_Handler;
910
911 if New_Handler = null then
912
913 -- The null handler means we are detaching the handler.
914
915 User_Handler (Interrupt).Static := False;
916
917 else
918 User_Handler (Interrupt).Static := Static;
919 end if;
920
921 -- Invoke a corresponding Server_Task if not yet created.
922 -- Place Task_ID info in Server_ID array.
923
924 if Server_ID (Interrupt) = Null_Task then
925
926 -- When a new Server_Task is created, it should have its
927 -- signal mask set to the All_Tasks_Mask.
928
929 IMOP.Set_Interrupt_Mask
930 (IMOP.All_Tasks_Mask'Access, Old_Mask'Access);
931 Access_Hold := new Server_Task (Interrupt);
932 IMOP.Set_Interrupt_Mask (Old_Mask'Access);
933
934 Server_ID (Interrupt) := To_System (Access_Hold.all'Identity);
935 end if;
936
937 if (New_Handler = null) then
938 if Old_Handler /= null then
939 Unbind_Handler (Interrupt);
940 end if;
941
942 return;
943 end if;
944
945 if Old_Handler = null then
946 Bind_Handler (Interrupt);
947 end if;
948
949 end Unprotected_Exchange_Handler;
950
951 -- Start of processing for Interrupt_Manager
952
953 begin
954 -- By making this task independent of master, when the process
955 -- goes away, the Interrupt_Manager will terminate gracefully.
956
957 System.Tasking.Utilities.Make_Independent;
958
959 -- Environment task gets its own interrupt mask, saves it,
960 -- and then masks all interrupts except the Keep_Unmasked set.
961
962 -- During rendezvous, the Interrupt_Manager receives the old
963 -- interrupt mask of the environment task, and sets its own
964 -- interrupt mask to that value.
965
966 -- The environment task will call the entry of Interrupt_Manager some
967 -- during elaboration of the body of this package.
968
969 accept Initialize (Mask : IMNG.Interrupt_Mask) do
970 declare
971 The_Mask : aliased IMNG.Interrupt_Mask;
972
973 begin
974 IMOP.Copy_Interrupt_Mask (The_Mask, Mask);
975 IMOP.Set_Interrupt_Mask (The_Mask'Access);
976 end;
977 end Initialize;
978
979 -- Note: All tasks in RTS will have all the Reserve Interrupts
980 -- being masked (except the Interrupt_Manager) and Keep_Unmasked
981 -- unmasked when created.
982
983 -- Abort_Task_Interrupt is one of the Interrupt unmasked
984 -- in all tasks. We mask the Interrupt in this particular task
985 -- so that "sigwait" is possible to catch an explicitly sent
986 -- Abort_Task_Interrupt from the Server_Tasks.
987
988 -- This sigwaiting is needed so that we make sure a Server_Task is
989 -- out of its own sigwait state. This extra synchronization is
990 -- necessary to prevent following senarios.
991
992 -- 1) Interrupt_Manager sends an Abort_Task_Interrupt to the
993 -- Server_Task then changes its own interrupt mask (OS level).
994 -- If an interrupt (corresponding to the Server_Task) arrives
995 -- in the nean time we have the Interrupt_Manager umnasked and
996 -- the Server_Task waiting on sigwait.
997
998 -- 2) For unbinding handler, we install a default action in the
999 -- Interrupt_Manager. POSIX.1c states that the result of using
1000 -- "sigwait" and "sigaction" simaltaneously on the same interrupt
1001 -- is undefined. Therefore, we need to be informed from the
1002 -- Server_Task of the fact that the Server_Task is out of its
1003 -- sigwait stage.
1004
1005 IMOP.Empty_Interrupt_Mask (Intwait_Mask'Access);
1006 IMOP.Add_To_Interrupt_Mask
1007 (Intwait_Mask'Access, IMNG.Abort_Task_Interrupt);
1008 IMOP.Thread_Block_Interrupt
1009 (IMNG.Abort_Task_Interrupt);
1010
1011 loop
1012 -- A block is needed to absorb Program_Error exception
1013
1014 begin
1015 select
1016 accept Attach_Handler
1017 (New_Handler : in Parameterless_Handler;
1018 Interrupt : in Interrupt_ID;
1019 Static : in Boolean;
1020 Restoration : in Boolean := False)
1021 do
1022 Unprotected_Exchange_Handler
1023 (Old_Handler, New_Handler, Interrupt, Static, Restoration);
1024 end Attach_Handler;
1025
1026 or
1027 accept Exchange_Handler
1028 (Old_Handler : out Parameterless_Handler;
1029 New_Handler : in Parameterless_Handler;
1030 Interrupt : in Interrupt_ID;
1031 Static : in Boolean)
1032 do
1033 Unprotected_Exchange_Handler
1034 (Old_Handler, New_Handler, Interrupt, Static);
1035 end Exchange_Handler;
1036
1037 or
1038 accept Detach_Handler
1039 (Interrupt : in Interrupt_ID;
1040 Static : in Boolean)
1041 do
1042 Unprotected_Detach_Handler (Interrupt, Static);
1043 end Detach_Handler;
1044
1045 or
1046 accept Bind_Interrupt_To_Entry
1047 (T : Task_ID;
1048 E : Task_Entry_Index;
1049 Interrupt : Interrupt_ID)
1050 do
1051 -- if there is a binding already (either a procedure or an
1052 -- entry), raise Program_Error (propagate it to the caller).
1053
1054 if User_Handler (Interrupt).H /= null
1055 or else User_Entry (Interrupt).T /= Null_Task
1056 then
1057 Raise_Exception (Program_Error'Identity,
1058 "A binding for this interrupt is already present");
1059 end if;
1060
1061 -- The interrupt should no longer be ingnored if
1062 -- it was ever ignored.
1063
1064 Ignored (Interrupt) := False;
1065 User_Entry (Interrupt) := Entry_Assoc' (T => T, E => E);
1066
1067 -- Indicate the attachment of Interrupt Entry in ATCB.
1068 -- This is need so that when an Interrupt Entry task
1069 -- terminates the binding can be cleaned. The call to
1070 -- unbinding must be made by the task before it terminates.
1071
1072 T.Interrupt_Entry := True;
1073
1074 -- Invoke a corresponding Server_Task if not yet created.
1075 -- Place Task_ID info in Server_ID array.
1076
1077 if Server_ID (Interrupt) = Null_Task then
1078 -- When a new Server_Task is created, it should have its
1079 -- signal mask set to the All_Tasks_Mask.
1080
1081 IMOP.Set_Interrupt_Mask
1082 (IMOP.All_Tasks_Mask'Access, Old_Mask'Access);
1083 Access_Hold := new Server_Task (Interrupt);
1084 IMOP.Set_Interrupt_Mask (Old_Mask'Access);
1085 Server_ID (Interrupt) :=
1086 To_System (Access_Hold.all'Identity);
1087 end if;
1088
1089 Bind_Handler (Interrupt);
1090 end Bind_Interrupt_To_Entry;
1091
1092 or
1093 accept Detach_Interrupt_Entries (T : Task_ID) do
1094 for J in Interrupt_ID'Range loop
1095 if not Is_Reserved (J) then
1096 if User_Entry (J).T = T then
1097 -- The interrupt should no longer be ingnored if
1098 -- it was ever ignored.
1099
1100 Ignored (J) := False;
1101 User_Entry (J) := Entry_Assoc'
1102 (T => Null_Task, E => Null_Task_Entry);
1103 Unbind_Handler (J);
1104 end if;
1105 end if;
1106 end loop;
1107
1108 -- Indicate in ATCB that no Interrupt Entries are attached.
1109
1110 T.Interrupt_Entry := False;
1111 end Detach_Interrupt_Entries;
1112
1113 or
1114 accept Block_Interrupt (Interrupt : Interrupt_ID) do
1115 if Blocked (Interrupt) then
1116 return;
1117 end if;
1118
1119 Blocked (Interrupt) := True;
1120 Last_Unblocker (Interrupt) := Null_Task;
1121
1122 -- Mask this task for the given Interrupt so that all tasks
1123 -- are masked for the Interrupt.
1124
1125 IMOP.Thread_Block_Interrupt (IMNG.Interrupt_ID (Interrupt));
1126
1127 if User_Handler (Interrupt).H /= null
1128 or else User_Entry (Interrupt).T /= Null_Task
1129 then
1130 -- This is the case where the Server_Task is waiting on
1131 -- "sigwait." Wake it up by sending an
1132 -- Abort_Task_Interrupt so that the Server_Task waits on
1133 -- Cond.
1134
1135 POP.Abort_Task (Server_ID (Interrupt));
1136
1137 -- Make sure corresponding Server_Task is out of its own
1138 -- sigwait state.
1139
1140 Ret_Interrupt := Interrupt_ID
1141 (IMOP.Interrupt_Wait (Intwait_Mask'Access));
1142 pragma Assert
1143 (Ret_Interrupt =
1144 Interrupt_ID (IMNG.Abort_Task_Interrupt));
1145 end if;
1146 end Block_Interrupt;
1147
1148 or
1149 accept Unblock_Interrupt (Interrupt : Interrupt_ID) do
1150 if not Blocked (Interrupt) then
1151 return;
1152 end if;
1153
1154 Blocked (Interrupt) := False;
1155 Last_Unblocker (Interrupt) :=
1156 To_System (Unblock_Interrupt'Caller);
1157
1158 if User_Handler (Interrupt).H = null
1159 and then User_Entry (Interrupt).T = Null_Task
1160 then
1161 -- No handler is attached. Unmask the Interrupt so that
1162 -- the default action can be carried out.
1163 IMOP.Thread_Unblock_Interrupt
1164 (IMNG.Interrupt_ID (Interrupt));
1165
1166 else
1167 -- The Server_Task must be waiting on the Cond variable
1168 -- since it was being blocked and an Interrupt Hander or
1169 -- an Entry was there. Wake it up and let it change
1170 -- it place of waiting according to its new state.
1171 POP.Wakeup (Server_ID (Interrupt),
1172 Interrupt_Server_Blocked_Interrupt_Sleep);
1173 end if;
1174 end Unblock_Interrupt;
1175
1176 or
1177 accept Ignore_Interrupt (Interrupt : Interrupt_ID) do
1178 if Ignored (Interrupt) then
1179 return;
1180 end if;
1181
1182 Ignored (Interrupt) := True;
1183
1184 -- If there is a handler associated with the Interrupt,
1185 -- detach it first. In this way we make sure that the
1186 -- Server_Task is not on sigwait. This is legal since
1187 -- Unignore_Interrupt is to install the default action.
1188
1189 if User_Handler (Interrupt).H /= null then
1190 Unprotected_Detach_Handler
1191 (Interrupt => Interrupt, Static => True);
1192
1193 elsif User_Entry (Interrupt).T /= Null_Task then
1194 User_Entry (Interrupt) := Entry_Assoc'
1195 (T => Null_Task, E => Null_Task_Entry);
1196 Unbind_Handler (Interrupt);
1197 end if;
1198
1199 IMOP.Install_Ignore_Action (IMNG.Interrupt_ID (Interrupt));
1200 end Ignore_Interrupt;
1201
1202 or
1203 accept Unignore_Interrupt (Interrupt : Interrupt_ID) do
1204 Ignored (Interrupt) := False;
1205
1206 -- If there is a handler associated with the Interrupt,
1207 -- detach it first. In this way we make sure that the
1208 -- Server_Task is not on sigwait. This is legal since
1209 -- Unignore_Interrupt is to install the default action.
1210
1211 if User_Handler (Interrupt).H /= null then
1212 Unprotected_Detach_Handler
1213 (Interrupt => Interrupt, Static => True);
1214
1215 elsif User_Entry (Interrupt).T /= Null_Task then
1216 User_Entry (Interrupt) := Entry_Assoc'
1217 (T => Null_Task, E => Null_Task_Entry);
1218 Unbind_Handler (Interrupt);
1219 end if;
1220
1221 IMOP.Install_Default_Action (IMNG.Interrupt_ID (Interrupt));
1222 end Unignore_Interrupt;
1223 end select;
1224
1225 exception
1226 -- If there is a program error we just want to propagate it to
1227 -- the caller and do not want to stop this task.
1228
1229 when Program_Error =>
1230 null;
1231
1232 when others =>
1233 pragma Assert (False);
1234 null;
1235 end;
1236 end loop;
1237 end Interrupt_Manager;
1238
1239 -----------------
1240 -- Server_Task --
1241 -----------------
1242
1243 task body Server_Task is
1244 Intwait_Mask : aliased IMNG.Interrupt_Mask;
1245 Ret_Interrupt : Interrupt_ID;
1246 Self_ID : Task_ID := Self;
1247 Tmp_Handler : Parameterless_Handler;
1248 Tmp_ID : Task_ID;
1249 Tmp_Entry_Index : Task_Entry_Index;
1250
1251 begin
1252 -- By making this task independent of master, when the process
1253 -- goes away, the Server_Task will terminate gracefully.
1254
1255 System.Tasking.Utilities.Make_Independent;
1256
1257 -- Install default action in system level.
1258
1259 IMOP.Install_Default_Action (IMNG.Interrupt_ID (Interrupt));
1260
1261 -- Note: All tasks in RTS will have all the Reserve Interrupts
1262 -- being masked (except the Interrupt_Manager) and Keep_Unmasked
1263 -- unmasked when created.
1264
1265 -- Abort_Task_Interrupt is one of the Interrupt unmasked
1266 -- in all tasks. We mask the Interrupt in this particular task
1267 -- so that "sigwait" is possible to catch an explicitly sent
1268 -- Abort_Task_Interrupt from the Interrupt_Manager.
1269
1270 -- There are two Interrupt interrupts that this task catch through
1271 -- "sigwait." One is the Interrupt this task is designated to catch
1272 -- in order to execure user handler or entry. The other one is the
1273 -- Abort_Task_Interrupt. This interrupt is being sent from the
1274 -- Interrupt_Manager to inform status changes (e.g: become Blocked,
1275 -- Handler or Entry is to be detached).
1276
1277 -- Prepare a mask to used for sigwait.
1278
1279 IMOP.Empty_Interrupt_Mask (Intwait_Mask'Access);
1280
1281 IMOP.Add_To_Interrupt_Mask
1282 (Intwait_Mask'Access, IMNG.Interrupt_ID (Interrupt));
1283
1284 IMOP.Add_To_Interrupt_Mask
1285 (Intwait_Mask'Access, IMNG.Abort_Task_Interrupt);
1286
1287 IMOP.Thread_Block_Interrupt
1288 (IMNG.Abort_Task_Interrupt);
1289
1290 PIO.Set_Interrupt_ID (IMNG.Interrupt_ID (Interrupt), Self_ID);
1291
1292 loop
1293 System.Tasking.Initialization.Defer_Abort (Self_ID);
1294
1295 if Single_Lock then
1296 POP.Lock_RTS;
1297 end if;
1298
1299 POP.Write_Lock (Self_ID);
1300
1301 if User_Handler (Interrupt).H = null
1302 and then User_Entry (Interrupt).T = Null_Task
1303 then
1304 -- No Interrupt binding. If there is an interrupt,
1305 -- Interrupt_Manager will take default action.
1306
1307 Self_ID.Common.State := Interrupt_Server_Blocked_Interrupt_Sleep;
1308 POP.Sleep (Self_ID, Interrupt_Server_Idle_Sleep);
1309 Self_ID.Common.State := Runnable;
1310
1311 elsif Blocked (Interrupt) then
1312
1313 -- Interrupt is blocked. Stay here, so we won't catch
1314 -- the Interrupt.
1315
1316 Self_ID.Common.State := Interrupt_Server_Blocked_Interrupt_Sleep;
1317 POP.Sleep (Self_ID, Interrupt_Server_Blocked_Interrupt_Sleep);
1318 Self_ID.Common.State := Runnable;
1319
1320 else
1321 -- A Handler or an Entry is installed. At this point all tasks
1322 -- mask for the Interrupt is masked. Catch the Interrupt using
1323 -- sigwait.
1324
1325 -- This task may wake up from sigwait by receiving an interrupt
1326 -- (Abort_Task_Interrupt) from the Interrupt_Manager for unbinding
1327 -- a Procedure Handler or an Entry. Or it could be a wake up
1328 -- from status change (Unblocked -> Blocked). If that is not
1329 -- the case, we should exceute the attached Procedure or Entry.
1330
1331 POP.Unlock (Self_ID);
1332
1333 if Single_Lock then
1334 POP.Unlock_RTS;
1335 end if;
1336
1337 Ret_Interrupt :=
1338 Interrupt_ID (IMOP.Interrupt_Wait (Intwait_Mask'Access));
1339
1340 if Ret_Interrupt = Interrupt_ID (IMNG.Abort_Task_Interrupt) then
1341
1342 -- Inform the Interrupt_Manager of wakeup from above sigwait.
1343
1344 POP.Abort_Task (Interrupt_Manager_ID);
1345
1346 if Single_Lock then
1347 POP.Lock_RTS;
1348 end if;
1349
1350 POP.Write_Lock (Self_ID);
1351
1352 else
1353 pragma Assert (Ret_Interrupt = Interrupt);
1354
1355 if Single_Lock then
1356 POP.Lock_RTS;
1357 end if;
1358
1359 POP.Write_Lock (Self_ID);
1360
1361 -- Even though we have received an Interrupt the status may
1362 -- have changed already before we got the Self_ID lock above.
1363 -- Therefore we make sure a Handler or an Entry is still
1364 -- there and make appropriate call.
1365 -- If there is no calls to make we need to regenerate the
1366 -- Interrupt in order not to lose it.
1367
1368 if User_Handler (Interrupt).H /= null then
1369 Tmp_Handler := User_Handler (Interrupt).H;
1370
1371 -- RTS calls should not be made with self being locked.
1372
1373 POP.Unlock (Self_ID);
1374
1375 if Single_Lock then
1376 POP.Unlock_RTS;
1377 end if;
1378
1379 Tmp_Handler.all;
1380
1381 if Single_Lock then
1382 POP.Lock_RTS;
1383 end if;
1384
1385 POP.Write_Lock (Self_ID);
1386
1387 elsif User_Entry (Interrupt).T /= Null_Task then
1388 Tmp_ID := User_Entry (Interrupt).T;
1389 Tmp_Entry_Index := User_Entry (Interrupt).E;
1390
1391 -- RTS calls should not be made with self being locked.
1392
1393 if Single_Lock then
1394 POP.Unlock_RTS;
1395 end if;
1396
1397 POP.Unlock (Self_ID);
1398
1399 System.Tasking.Rendezvous.Call_Simple
1400 (Tmp_ID, Tmp_Entry_Index, System.Null_Address);
1401
1402 POP.Write_Lock (Self_ID);
1403
1404 if Single_Lock then
1405 POP.Lock_RTS;
1406 end if;
1407
1408 else
1409 -- This is a situation that this task wake up
1410 -- receiving an Interrupt and before it get the lock
1411 -- the Interrupt is blocked. We do not
1412 -- want to lose the interrupt in this case so that
1413 -- regenerate the Interrupt to process level;
1414
1415 IMOP.Interrupt_Self_Process (IMNG.Interrupt_ID (Interrupt));
1416 end if;
1417 end if;
1418 end if;
1419
1420 POP.Unlock (Self_ID);
1421
1422 if Single_Lock then
1423 POP.Unlock_RTS;
1424 end if;
1425
1426 System.Tasking.Initialization.Undefer_Abort (Self_ID);
1427
1428 -- Undefer abort here to allow a window for this task
1429 -- to be aborted at the time of system shutdown.
1430 end loop;
1431 end Server_Task;
1432
1433 -- Elaboration code for package System.Interrupts
1434
1435 begin
1436
1437 -- Get Interrupt_Manager's ID so that Abort_Interrupt can be sent.
1438
1439 Interrupt_Manager_ID := To_System (Interrupt_Manager'Identity);
1440
1441 -- During the elaboration of this package body we want RTS to
1442 -- inherit the interrupt mask from the Environment Task.
1443
1444 -- The Environment Task should have gotten its mask from
1445 -- the enclosing process during the RTS start up. (See
1446 -- in s-inmaop.adb). Pass the Interrupt_Mask of the Environment
1447 -- task to the Interrupt_Manager.
1448
1449 -- Note : At this point we know that all tasks (including
1450 -- RTS internal servers) are masked for non-reserved signals
1451 -- (see s-taprop.adb). Only the Interrupt_Manager will have
1452 -- masks set up differently inheriting the original Environment
1453 -- Task's mask.
1454
1455 Interrupt_Manager.Initialize (IMOP.Environment_Mask);
1456 end System.Interrupts;
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