1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . I N T E R R U P T S --
9 -- Copyright (C) 1998-2005 Free Software Fundation --
11 -- GNARL is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is the IRIX & NT version of this package
36 with Ada.Task_Identification;
40 -- used for Raise_Exception
42 with System.OS_Interface;
43 -- used for intr_attach
45 with System.Storage_Elements;
46 -- used for To_Address
49 with System.Task_Primitives.Operations;
56 with System.Tasking.Utilities;
57 -- used for Make_Independent
59 with System.Tasking.Rendezvous;
60 -- used for Call_Simple
62 with System.Tasking.Initialization;
63 -- used for Defer_Abort
66 with System.Interrupt_Management;
68 with System.Parameters;
69 -- used for Single_Lock
74 with Unchecked_Conversion;
76 package body System.Interrupts is
81 use System.OS_Interface;
84 package STPO renames System.Task_Primitives.Operations;
85 package IMNG renames System.Interrupt_Management;
87 subtype int is Interfaces.C.int;
89 function To_System is new Unchecked_Conversion
90 (Ada.Task_Identification.Task_Id, Task_Id);
92 type Handler_Kind is (Unknown, Task_Entry, Protected_Procedure);
94 type Handler_Desc is record
95 Kind : Handler_Kind := Unknown;
98 H : Parameterless_Handler;
99 Static : Boolean := False;
102 task type Server_Task (Interrupt : Interrupt_ID) is
103 pragma Interrupt_Priority (System.Interrupt_Priority'Last);
106 type Server_Task_Access is access Server_Task;
108 Handlers : array (Interrupt_ID) of Task_Id;
109 Descriptors : array (Interrupt_ID) of Handler_Desc;
110 Interrupt_Count : array (Interrupt_ID) of Integer := (others => 0);
112 pragma Volatile_Components (Interrupt_Count);
114 procedure Attach_Handler
115 (New_Handler : Parameterless_Handler;
116 Interrupt : Interrupt_ID;
118 Restoration : Boolean);
119 -- This internal procedure is needed to finalize protected objects
120 -- that contain interrupt handlers.
122 procedure Signal_Handler (Sig : Interrupt_ID);
123 -- This procedure is used to handle all the signals
125 -- Type and Head, Tail of the list containing Registered Interrupt
126 -- Handlers. These definitions are used to register the handlers
127 -- specified by the pragma Interrupt_Handler.
129 --------------------------
130 -- Handler Registration --
131 --------------------------
133 type Registered_Handler;
134 type R_Link is access all Registered_Handler;
136 type Registered_Handler is record
137 H : System.Address := System.Null_Address;
138 Next : R_Link := null;
141 Registered_Handlers : R_Link := null;
143 function Is_Registered (Handler : Parameterless_Handler) return Boolean;
144 -- See if the Handler has been "pragma"ed using Interrupt_Handler.
145 -- Always consider a null handler as registered.
147 type Handler_Ptr is access procedure (Sig : Interrupt_ID);
149 function TISR is new Unchecked_Conversion (Handler_Ptr, isr_address);
155 procedure Signal_Handler (Sig : Interrupt_ID) is
156 Handler : Task_Id renames Handlers (Sig);
159 if Intr_Attach_Reset and then
160 intr_attach (int (Sig), TISR (Signal_Handler'Access)) = FUNC_ERR
165 if Handler /= null then
166 Interrupt_Count (Sig) := Interrupt_Count (Sig) + 1;
167 STPO.Wakeup (Handler, Interrupt_Server_Idle_Sleep);
175 function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is
177 return IMNG.Reserve (IMNG.Interrupt_ID (Interrupt));
180 -----------------------
181 -- Is_Entry_Attached --
182 -----------------------
184 function Is_Entry_Attached (Interrupt : Interrupt_ID) return Boolean is
186 if Is_Reserved (Interrupt) then
187 Raise_Exception (Program_Error'Identity, "Interrupt" &
188 Interrupt_ID'Image (Interrupt) & " is reserved");
191 return Descriptors (Interrupt).T /= Null_Task;
192 end Is_Entry_Attached;
194 -------------------------
195 -- Is_Handler_Attached --
196 -------------------------
198 function Is_Handler_Attached (Interrupt : Interrupt_ID) return Boolean is
200 if Is_Reserved (Interrupt) then
201 Raise_Exception (Program_Error'Identity, "Interrupt" &
202 Interrupt_ID'Image (Interrupt) & " is reserved");
205 return Descriptors (Interrupt).Kind /= Unknown;
206 end Is_Handler_Attached;
212 function Is_Ignored (Interrupt : Interrupt_ID) return Boolean is
222 function Unblocked_By (Interrupt : Interrupt_ID) return Task_Id is
228 ----------------------
229 -- Ignore_Interrupt --
230 ----------------------
232 procedure Ignore_Interrupt (Interrupt : Interrupt_ID) is
235 end Ignore_Interrupt;
237 ------------------------
238 -- Unignore_Interrupt --
239 ------------------------
241 procedure Unignore_Interrupt (Interrupt : Interrupt_ID) is
244 end Unignore_Interrupt;
246 -------------------------------------
247 -- Has_Interrupt_Or_Attach_Handler --
248 -------------------------------------
250 function Has_Interrupt_Or_Attach_Handler
251 (Object : access Dynamic_Interrupt_Protection) return Boolean
253 pragma Unreferenced (Object);
256 end Has_Interrupt_Or_Attach_Handler;
262 procedure Finalize (Object : in out Static_Interrupt_Protection) is
264 -- ??? loop to be executed only when we're not doing library level
265 -- finalization, since in this case all interrupt tasks are gone.
267 for N in reverse Object.Previous_Handlers'Range loop
269 (New_Handler => Object.Previous_Handlers (N).Handler,
270 Interrupt => Object.Previous_Handlers (N).Interrupt,
271 Static => Object.Previous_Handlers (N).Static,
272 Restoration => True);
275 Tasking.Protected_Objects.Entries.Finalize
276 (Tasking.Protected_Objects.Entries.Protection_Entries (Object));
279 -------------------------------------
280 -- Has_Interrupt_Or_Attach_Handler --
281 -------------------------------------
283 function Has_Interrupt_Or_Attach_Handler
284 (Object : access Static_Interrupt_Protection) return Boolean
286 pragma Unreferenced (Object);
289 end Has_Interrupt_Or_Attach_Handler;
291 ----------------------
292 -- Install_Handlers --
293 ----------------------
295 procedure Install_Handlers
296 (Object : access Static_Interrupt_Protection;
297 New_Handlers : New_Handler_Array)
300 for N in New_Handlers'Range loop
302 -- We need a lock around this ???
304 Object.Previous_Handlers (N).Interrupt := New_Handlers (N).Interrupt;
305 Object.Previous_Handlers (N).Static := Descriptors
306 (New_Handlers (N).Interrupt).Static;
308 -- We call Exchange_Handler and not directly Interrupt_Manager.
309 -- Exchange_Handler so we get the Is_Reserved check.
312 (Old_Handler => Object.Previous_Handlers (N).Handler,
313 New_Handler => New_Handlers (N).Handler,
314 Interrupt => New_Handlers (N).Interrupt,
317 end Install_Handlers;
319 ---------------------
320 -- Current_Handler --
321 ---------------------
323 function Current_Handler
324 (Interrupt : Interrupt_ID) return Parameterless_Handler
327 if Is_Reserved (Interrupt) then
331 if Descriptors (Interrupt).Kind = Protected_Procedure then
332 return Descriptors (Interrupt).H;
342 procedure Attach_Handler
343 (New_Handler : Parameterless_Handler;
344 Interrupt : Interrupt_ID;
345 Static : Boolean := False) is
347 Attach_Handler (New_Handler, Interrupt, Static, False);
350 procedure Attach_Handler
351 (New_Handler : Parameterless_Handler;
352 Interrupt : Interrupt_ID;
354 Restoration : Boolean)
356 New_Task : Server_Task_Access;
359 if Is_Reserved (Interrupt) then
363 if not Restoration and then not Static
365 -- Tries to overwrite a static Interrupt Handler with dynamic handle
368 (Descriptors (Interrupt).Static
370 -- New handler not specified as an Interrupt Handler by a pragma
372 or else not Is_Registered (New_Handler))
374 Raise_Exception (Program_Error'Identity,
375 "Trying to overwrite a static Interrupt Handler with a " &
379 if Handlers (Interrupt) = null then
380 New_Task := new Server_Task (Interrupt);
381 Handlers (Interrupt) := To_System (New_Task.all'Identity);
384 if intr_attach (int (Interrupt),
385 TISR (Signal_Handler'Access)) = FUNC_ERR
390 if New_Handler = null then
392 -- The null handler means we are detaching the handler
394 Descriptors (Interrupt) :=
395 (Kind => Unknown, T => null, E => 0, H => null, Static => False);
398 Descriptors (Interrupt).Kind := Protected_Procedure;
399 Descriptors (Interrupt).H := New_Handler;
400 Descriptors (Interrupt).Static := Static;
404 ----------------------
405 -- Exchange_Handler --
406 ----------------------
408 procedure Exchange_Handler
409 (Old_Handler : out Parameterless_Handler;
410 New_Handler : Parameterless_Handler;
411 Interrupt : Interrupt_ID;
412 Static : Boolean := False)
415 if Is_Reserved (Interrupt) then
419 if Descriptors (Interrupt).Kind = Task_Entry then
421 -- In case we have an Interrupt Entry already installed.
422 -- raise a program error. (propagate it to the caller).
424 Raise_Exception (Program_Error'Identity,
425 "An interrupt is already installed");
428 Old_Handler := Current_Handler (Interrupt);
429 Attach_Handler (New_Handler, Interrupt, Static);
430 end Exchange_Handler;
436 procedure Detach_Handler
437 (Interrupt : Interrupt_ID;
438 Static : Boolean := False)
441 if Is_Reserved (Interrupt) then
445 if Descriptors (Interrupt).Kind = Task_Entry then
446 Raise_Exception (Program_Error'Identity,
447 "Trying to detach an Interrupt Entry");
450 if not Static and then Descriptors (Interrupt).Static then
451 Raise_Exception (Program_Error'Identity,
452 "Trying to detach a static Interrupt Handler");
455 Descriptors (Interrupt) :=
456 (Kind => Unknown, T => null, E => 0, H => null, Static => False);
458 if intr_attach (int (Interrupt), null) = FUNC_ERR then
467 function Reference (Interrupt : Interrupt_ID) return System.Address is
468 Signal : constant System.Address :=
469 System.Storage_Elements.To_Address
470 (System.Storage_Elements.Integer_Address (Interrupt));
473 if Is_Reserved (Interrupt) then
475 -- Only usable Interrupts can be used for binding it to an Entry
483 --------------------------------
484 -- Register_Interrupt_Handler --
485 --------------------------------
487 procedure Register_Interrupt_Handler (Handler_Addr : System.Address) is
489 Registered_Handlers :=
490 new Registered_Handler'(H => Handler_Addr, Next => Registered_Handlers);
491 end Register_Interrupt_Handler;
497 -- See if the Handler has been "pragma"ed using Interrupt_Handler.
498 -- Always consider a null handler as registered.
500 function Is_Registered (Handler : Parameterless_Handler) return Boolean is
501 Ptr : R_Link := Registered_Handlers;
503 type Fat_Ptr is record
504 Object_Addr : System.Address;
505 Handler_Addr : System.Address;
508 function To_Fat_Ptr is new Unchecked_Conversion
509 (Parameterless_Handler, Fat_Ptr);
514 if Handler = null then
518 Fat := To_Fat_Ptr (Handler);
520 while Ptr /= null loop
522 if Ptr.H = Fat.Handler_Addr then
532 -----------------------------
533 -- Bind_Interrupt_To_Entry --
534 -----------------------------
536 procedure Bind_Interrupt_To_Entry
538 E : Task_Entry_Index;
539 Int_Ref : System.Address)
541 Interrupt : constant Interrupt_ID :=
542 Interrupt_ID (Storage_Elements.To_Integer (Int_Ref));
544 New_Task : Server_Task_Access;
547 if Is_Reserved (Interrupt) then
551 if Descriptors (Interrupt).Kind /= Unknown then
552 Raise_Exception (Program_Error'Identity,
553 "A binding for this interrupt is already present");
556 if Handlers (Interrupt) = null then
557 New_Task := new Server_Task (Interrupt);
558 Handlers (Interrupt) := To_System (New_Task.all'Identity);
561 if intr_attach (int (Interrupt),
562 TISR (Signal_Handler'Access)) = FUNC_ERR
567 Descriptors (Interrupt).Kind := Task_Entry;
568 Descriptors (Interrupt).T := T;
569 Descriptors (Interrupt).E := E;
571 -- Indicate the attachment of Interrupt Entry in ATCB. This is needed so
572 -- that when an Interrupt Entry task terminates the binding can be
573 -- cleaned up. The call to unbinding must be make by the task before it
576 T.Interrupt_Entry := True;
577 end Bind_Interrupt_To_Entry;
579 ------------------------------
580 -- Detach_Interrupt_Entries --
581 ------------------------------
583 procedure Detach_Interrupt_Entries (T : Task_Id) is
585 for J in Interrupt_ID loop
586 if not Is_Reserved (J) then
587 if Descriptors (J).Kind = Task_Entry
588 and then Descriptors (J).T = T
590 Descriptors (J).Kind := Unknown;
592 if intr_attach (int (J), null) = FUNC_ERR then
599 -- Indicate in ATCB that no Interrupt Entries are attached
601 T.Interrupt_Entry := True;
602 end Detach_Interrupt_Entries;
604 ---------------------
605 -- Block_Interrupt --
606 ---------------------
608 procedure Block_Interrupt (Interrupt : Interrupt_ID) is
613 -----------------------
614 -- Unblock_Interrupt --
615 -----------------------
617 procedure Unblock_Interrupt (Interrupt : Interrupt_ID) is
620 end Unblock_Interrupt;
626 function Is_Blocked (Interrupt : Interrupt_ID) return Boolean is
632 task body Server_Task is
633 Desc : Handler_Desc renames Descriptors (Interrupt);
634 Self_Id : constant Task_Id := STPO.Self;
635 Temp : Parameterless_Handler;
638 Utilities.Make_Independent;
641 while Interrupt_Count (Interrupt) > 0 loop
642 Interrupt_Count (Interrupt) := Interrupt_Count (Interrupt) - 1;
648 Rendezvous.Call_Simple (Desc.T, Desc.E, Null_Address);
649 when Protected_Procedure =>
658 Initialization.Defer_Abort (Self_Id);
664 STPO.Write_Lock (Self_Id);
665 Self_Id.Common.State := Interrupt_Server_Idle_Sleep;
666 STPO.Sleep (Self_Id, Interrupt_Server_Idle_Sleep);
667 Self_Id.Common.State := Runnable;
668 STPO.Unlock (Self_Id);
674 Initialization.Undefer_Abort (Self_Id);
676 -- Undefer abort here to allow a window for this task to be aborted
677 -- at the time of system shutdown.
682 end System.Interrupts;