1 ------------------------------------------------------------------------------
3 -- GNAT 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) 1998-2006, 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, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, 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
.Storage_Elements
;
43 -- used for To_Address
46 with System
.Task_Primitives
.Operations
;
53 with System
.Tasking
.Utilities
;
54 -- used for Make_Independent
56 with System
.Tasking
.Rendezvous
;
57 -- used for Call_Simple
59 with System
.Tasking
.Initialization
;
60 -- used for Defer_Abort
63 with System
.Interrupt_Management
;
65 with System
.Parameters
;
66 -- used for Single_Lock
71 with Unchecked_Conversion
;
73 package body System
.Interrupts
is
78 use System
.OS_Interface
;
81 package STPO
renames System
.Task_Primitives
.Operations
;
82 package IMNG
renames System
.Interrupt_Management
;
84 subtype int
is Interfaces
.C
.int
;
86 function To_System
is new Unchecked_Conversion
87 (Ada
.Task_Identification
.Task_Id
, Task_Id
);
89 type Handler_Kind
is (Unknown
, Task_Entry
, Protected_Procedure
);
91 type Handler_Desc
is record
92 Kind
: Handler_Kind
:= Unknown
;
95 H
: Parameterless_Handler
;
96 Static
: Boolean := False;
99 task type Server_Task
(Interrupt
: Interrupt_ID
) is
100 pragma Interrupt_Priority
(System
.Interrupt_Priority
'Last);
103 type Server_Task_Access
is access Server_Task
;
105 Handlers
: array (Interrupt_ID
) of Task_Id
;
106 Descriptors
: array (Interrupt_ID
) of Handler_Desc
;
107 Interrupt_Count
: array (Interrupt_ID
) of Integer := (others => 0);
109 pragma Volatile_Components
(Interrupt_Count
);
111 procedure Attach_Handler
112 (New_Handler
: Parameterless_Handler
;
113 Interrupt
: Interrupt_ID
;
115 Restoration
: Boolean);
116 -- This internal procedure is needed to finalize protected objects
117 -- that contain interrupt handlers.
119 procedure Signal_Handler
(Sig
: Interrupt_ID
);
120 -- This procedure is used to handle all the signals
122 -- Type and Head, Tail of the list containing Registered Interrupt
123 -- Handlers. These definitions are used to register the handlers
124 -- specified by the pragma Interrupt_Handler.
126 --------------------------
127 -- Handler Registration --
128 --------------------------
130 type Registered_Handler
;
131 type R_Link
is access all Registered_Handler
;
133 type Registered_Handler
is record
134 H
: System
.Address
:= System
.Null_Address
;
135 Next
: R_Link
:= null;
138 Registered_Handlers
: R_Link
:= null;
140 function Is_Registered
(Handler
: Parameterless_Handler
) return Boolean;
141 -- See if the Handler has been "pragma"ed using Interrupt_Handler.
142 -- Always consider a null handler as registered.
144 type Handler_Ptr
is access procedure (Sig
: Interrupt_ID
);
146 function TISR
is new Unchecked_Conversion
(Handler_Ptr
, isr_address
);
152 procedure Signal_Handler
(Sig
: Interrupt_ID
) is
153 Handler
: Task_Id
renames Handlers
(Sig
);
156 if Intr_Attach_Reset
and then
157 intr_attach
(int
(Sig
), TISR
(Signal_Handler
'Access)) = FUNC_ERR
162 if Handler
/= null then
163 Interrupt_Count
(Sig
) := Interrupt_Count
(Sig
) + 1;
164 STPO
.Wakeup
(Handler
, Interrupt_Server_Idle_Sleep
);
172 function Is_Reserved
(Interrupt
: Interrupt_ID
) return Boolean is
174 return IMNG
.Reserve
(IMNG
.Interrupt_ID
(Interrupt
));
177 -----------------------
178 -- Is_Entry_Attached --
179 -----------------------
181 function Is_Entry_Attached
(Interrupt
: Interrupt_ID
) return Boolean is
183 if Is_Reserved
(Interrupt
) then
184 Raise_Exception
(Program_Error
'Identity, "Interrupt" &
185 Interrupt_ID
'Image (Interrupt
) & " is reserved");
188 return Descriptors
(Interrupt
).T
/= Null_Task
;
189 end Is_Entry_Attached
;
191 -------------------------
192 -- Is_Handler_Attached --
193 -------------------------
195 function Is_Handler_Attached
(Interrupt
: Interrupt_ID
) return Boolean is
197 if Is_Reserved
(Interrupt
) then
198 Raise_Exception
(Program_Error
'Identity, "Interrupt" &
199 Interrupt_ID
'Image (Interrupt
) & " is reserved");
202 return Descriptors
(Interrupt
).Kind
/= Unknown
;
203 end Is_Handler_Attached
;
209 function Is_Ignored
(Interrupt
: Interrupt_ID
) return Boolean is
219 function Unblocked_By
(Interrupt
: Interrupt_ID
) return Task_Id
is
225 ----------------------
226 -- Ignore_Interrupt --
227 ----------------------
229 procedure Ignore_Interrupt
(Interrupt
: Interrupt_ID
) is
232 end Ignore_Interrupt
;
234 ------------------------
235 -- Unignore_Interrupt --
236 ------------------------
238 procedure Unignore_Interrupt
(Interrupt
: Interrupt_ID
) is
241 end Unignore_Interrupt
;
243 -------------------------------------
244 -- Has_Interrupt_Or_Attach_Handler --
245 -------------------------------------
247 function Has_Interrupt_Or_Attach_Handler
248 (Object
: access Dynamic_Interrupt_Protection
) return Boolean
250 pragma Unreferenced
(Object
);
253 end Has_Interrupt_Or_Attach_Handler
;
259 procedure Finalize
(Object
: in out Static_Interrupt_Protection
) is
261 -- ??? loop to be executed only when we're not doing library level
262 -- finalization, since in this case all interrupt tasks are gone.
264 for N
in reverse Object
.Previous_Handlers
'Range loop
266 (New_Handler
=> Object
.Previous_Handlers
(N
).Handler
,
267 Interrupt
=> Object
.Previous_Handlers
(N
).Interrupt
,
268 Static
=> Object
.Previous_Handlers
(N
).Static
,
269 Restoration
=> True);
272 Tasking
.Protected_Objects
.Entries
.Finalize
273 (Tasking
.Protected_Objects
.Entries
.Protection_Entries
(Object
));
276 -------------------------------------
277 -- Has_Interrupt_Or_Attach_Handler --
278 -------------------------------------
280 function Has_Interrupt_Or_Attach_Handler
281 (Object
: access Static_Interrupt_Protection
) return Boolean
283 pragma Unreferenced
(Object
);
286 end Has_Interrupt_Or_Attach_Handler
;
288 ----------------------
289 -- Install_Handlers --
290 ----------------------
292 procedure Install_Handlers
293 (Object
: access Static_Interrupt_Protection
;
294 New_Handlers
: New_Handler_Array
)
297 for N
in New_Handlers
'Range loop
299 -- We need a lock around this ???
301 Object
.Previous_Handlers
(N
).Interrupt
:= New_Handlers
(N
).Interrupt
;
302 Object
.Previous_Handlers
(N
).Static
:= Descriptors
303 (New_Handlers
(N
).Interrupt
).Static
;
305 -- We call Exchange_Handler and not directly Interrupt_Manager.
306 -- Exchange_Handler so we get the Is_Reserved check.
309 (Old_Handler
=> Object
.Previous_Handlers
(N
).Handler
,
310 New_Handler
=> New_Handlers
(N
).Handler
,
311 Interrupt
=> New_Handlers
(N
).Interrupt
,
314 end Install_Handlers
;
316 ---------------------
317 -- Current_Handler --
318 ---------------------
320 function Current_Handler
321 (Interrupt
: Interrupt_ID
) return Parameterless_Handler
324 if Is_Reserved
(Interrupt
) then
328 if Descriptors
(Interrupt
).Kind
= Protected_Procedure
then
329 return Descriptors
(Interrupt
).H
;
339 procedure Attach_Handler
340 (New_Handler
: Parameterless_Handler
;
341 Interrupt
: Interrupt_ID
;
342 Static
: Boolean := False) is
344 Attach_Handler
(New_Handler
, Interrupt
, Static
, False);
347 procedure Attach_Handler
348 (New_Handler
: Parameterless_Handler
;
349 Interrupt
: Interrupt_ID
;
351 Restoration
: Boolean)
353 New_Task
: Server_Task_Access
;
356 if Is_Reserved
(Interrupt
) then
360 if not Restoration
and then not Static
362 -- Tries to overwrite a static Interrupt Handler with dynamic handle
365 (Descriptors
(Interrupt
).Static
367 -- New handler not specified as an Interrupt Handler by a pragma
369 or else not Is_Registered
(New_Handler
))
371 Raise_Exception
(Program_Error
'Identity,
372 "Trying to overwrite a static Interrupt Handler with a " &
376 if Handlers
(Interrupt
) = null then
377 New_Task
:= new Server_Task
(Interrupt
);
378 Handlers
(Interrupt
) := To_System
(New_Task
.all'Identity);
381 if intr_attach
(int
(Interrupt
),
382 TISR
(Signal_Handler
'Access)) = FUNC_ERR
387 if New_Handler
= null then
389 -- The null handler means we are detaching the handler
391 Descriptors
(Interrupt
) :=
392 (Kind
=> Unknown
, T
=> null, E
=> 0, H
=> null, Static
=> False);
395 Descriptors
(Interrupt
).Kind
:= Protected_Procedure
;
396 Descriptors
(Interrupt
).H
:= New_Handler
;
397 Descriptors
(Interrupt
).Static
:= Static
;
401 ----------------------
402 -- Exchange_Handler --
403 ----------------------
405 procedure Exchange_Handler
406 (Old_Handler
: out Parameterless_Handler
;
407 New_Handler
: Parameterless_Handler
;
408 Interrupt
: Interrupt_ID
;
409 Static
: Boolean := False)
412 if Is_Reserved
(Interrupt
) then
416 if Descriptors
(Interrupt
).Kind
= Task_Entry
then
418 -- In case we have an Interrupt Entry already installed.
419 -- raise a program error. (propagate it to the caller).
421 Raise_Exception
(Program_Error
'Identity,
422 "An interrupt is already installed");
425 Old_Handler
:= Current_Handler
(Interrupt
);
426 Attach_Handler
(New_Handler
, Interrupt
, Static
);
427 end Exchange_Handler
;
433 procedure Detach_Handler
434 (Interrupt
: Interrupt_ID
;
435 Static
: Boolean := False)
438 if Is_Reserved
(Interrupt
) then
442 if Descriptors
(Interrupt
).Kind
= Task_Entry
then
443 Raise_Exception
(Program_Error
'Identity,
444 "Trying to detach an Interrupt Entry");
447 if not Static
and then Descriptors
(Interrupt
).Static
then
448 Raise_Exception
(Program_Error
'Identity,
449 "Trying to detach a static Interrupt Handler");
452 Descriptors
(Interrupt
) :=
453 (Kind
=> Unknown
, T
=> null, E
=> 0, H
=> null, Static
=> False);
455 if intr_attach
(int
(Interrupt
), null) = FUNC_ERR
then
464 function Reference
(Interrupt
: Interrupt_ID
) return System
.Address
is
465 Signal
: constant System
.Address
:=
466 System
.Storage_Elements
.To_Address
467 (System
.Storage_Elements
.Integer_Address
(Interrupt
));
470 if Is_Reserved
(Interrupt
) then
472 -- Only usable Interrupts can be used for binding it to an Entry
480 --------------------------------
481 -- Register_Interrupt_Handler --
482 --------------------------------
484 procedure Register_Interrupt_Handler
(Handler_Addr
: System
.Address
) is
486 Registered_Handlers
:=
487 new Registered_Handler
'(H => Handler_Addr, Next => Registered_Handlers);
488 end Register_Interrupt_Handler;
494 -- See if the Handler has been "pragma"ed using Interrupt_Handler.
495 -- Always consider a null handler as registered.
497 function Is_Registered (Handler : Parameterless_Handler) return Boolean is
498 Ptr : R_Link := Registered_Handlers;
500 type Fat_Ptr is record
501 Object_Addr : System.Address;
502 Handler_Addr : System.Address;
505 function To_Fat_Ptr is new Unchecked_Conversion
506 (Parameterless_Handler, Fat_Ptr);
511 if Handler = null then
515 Fat := To_Fat_Ptr (Handler);
517 while Ptr /= null loop
519 if Ptr.H = Fat.Handler_Addr then
529 -----------------------------
530 -- Bind_Interrupt_To_Entry --
531 -----------------------------
533 procedure Bind_Interrupt_To_Entry
535 E : Task_Entry_Index;
536 Int_Ref : System.Address)
538 Interrupt : constant Interrupt_ID :=
539 Interrupt_ID (Storage_Elements.To_Integer (Int_Ref));
541 New_Task : Server_Task_Access;
544 if Is_Reserved (Interrupt) then
548 if Descriptors (Interrupt).Kind /= Unknown then
549 Raise_Exception (Program_Error'Identity,
550 "A binding for this interrupt is already present");
553 if Handlers (Interrupt) = null then
554 New_Task := new Server_Task (Interrupt);
555 Handlers (Interrupt) := To_System (New_Task.all'Identity);
558 if intr_attach (int (Interrupt),
559 TISR (Signal_Handler'Access)) = FUNC_ERR
564 Descriptors (Interrupt).Kind := Task_Entry;
565 Descriptors (Interrupt).T := T;
566 Descriptors (Interrupt).E := E;
568 -- Indicate the attachment of Interrupt Entry in ATCB. This is needed so
569 -- that when an Interrupt Entry task terminates the binding can be
570 -- cleaned up. The call to unbinding must be make by the task before it
573 T.Interrupt_Entry := True;
574 end Bind_Interrupt_To_Entry;
576 ------------------------------
577 -- Detach_Interrupt_Entries --
578 ------------------------------
580 procedure Detach_Interrupt_Entries (T : Task_Id) is
582 for J in Interrupt_ID loop
583 if not Is_Reserved (J) then
584 if Descriptors (J).Kind = Task_Entry
585 and then Descriptors (J).T = T
587 Descriptors (J).Kind := Unknown;
589 if intr_attach (int (J), null) = FUNC_ERR then
596 -- Indicate in ATCB that no Interrupt Entries are attached
598 T.Interrupt_Entry := True;
599 end Detach_Interrupt_Entries;
601 ---------------------
602 -- Block_Interrupt --
603 ---------------------
605 procedure Block_Interrupt (Interrupt : Interrupt_ID) is
610 -----------------------
611 -- Unblock_Interrupt --
612 -----------------------
614 procedure Unblock_Interrupt (Interrupt : Interrupt_ID) is
617 end Unblock_Interrupt;
623 function Is_Blocked (Interrupt : Interrupt_ID) return Boolean is
629 task body Server_Task is
630 Desc : Handler_Desc renames Descriptors (Interrupt);
631 Self_Id : constant Task_Id := STPO.Self;
632 Temp : Parameterless_Handler;
635 Utilities.Make_Independent;
638 while Interrupt_Count (Interrupt) > 0 loop
639 Interrupt_Count (Interrupt) := Interrupt_Count (Interrupt) - 1;
645 Rendezvous.Call_Simple (Desc.T, Desc.E, Null_Address);
646 when Protected_Procedure =>
655 Initialization.Defer_Abort (Self_Id);
661 STPO.Write_Lock (Self_Id);
662 Self_Id.Common.State := Interrupt_Server_Idle_Sleep;
663 STPO.Sleep (Self_Id, Interrupt_Server_Idle_Sleep);
664 Self_Id.Common.State := Runnable;
665 STPO.Unlock (Self_Id);
671 Initialization.Undefer_Abort (Self_Id);
673 -- Undefer abort here to allow a window for this task to be aborted
674 -- at the time of system shutdown.
679 end System.Interrupts;