2 * This software is part of the SBCL system. See the README file for
5 * This software is derived from the CMU CL system, which was
6 * written at Carnegie Mellon University and released into the
7 * public domain. The software is in the public domain and is
8 * provided with absolutely no warranty. See the COPYING and CREDITS
9 * files for more information.
12 #if !defined(_INCLUDE_INTERRUPT_H_)
13 #define _INCLUDE_INTERRUPT_H_
17 /* maximum signal nesting depth
19 * Note: In CMU CL, this was 4096, but there was no explanation given,
20 * and it's hard to see why we'd need that many nested interrupts, so
21 * I've scaled it back to see what happens. -- WHN 20000730 */
22 #define MAX_INTERRUPTS 8
24 union interrupt_handler {
26 void (*c)(int, siginfo_t*, void*);
29 struct interrupt_data {
30 void (*interrupt_low_level_handlers[NSIG]) (int, siginfo_t*, void*) ;
31 union interrupt_handler interrupt_handlers[NSIG];
33 /* signal number, siginfo_t, and old mask information for pending
34 * signal. pending_signal=0 when there is no pending signal. */
36 siginfo_t pending_info;
37 sigset_t pending_mask;
41 extern void interrupt_init();
42 extern void fake_foreign_function_call(os_context_t* context);
43 extern void undo_fake_foreign_function_call(os_context_t* context);
44 extern void interrupt_handle_now(int, siginfo_t*, void*);
45 extern void interrupt_handle_pending(os_context_t*);
46 extern void interrupt_internal_error(int, siginfo_t*, os_context_t*,
48 extern boolean handle_control_stack_guard_triggered(os_context_t *,void *);
49 extern boolean interrupt_maybe_gc(int, siginfo_t*, void*);
50 extern void undoably_install_low_level_interrupt_handler (int signal,
55 extern unsigned long install_handler(int signal,
56 void handler(int, siginfo_t*, void*));
58 extern union interrupt_handler interrupt_handlers[NSIG];
60 /* Set all blockable signals into *s. */
61 void sigaddset_blockable(sigset_t *s);
63 /* The void* casting here avoids having to mess with the various types
64 * of function argument lists possible for signal handlers:
65 * SA_SIGACTION handlers have one signature, and the default old-style
66 * signal(..) handlers have another, and attempting to represent them
67 * "cleanly" with union types is in fact a mess. */
68 #define ARE_SAME_HANDLER(x, y) ((void*)(x) == (void*)(y))