X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Finterrupt.h;h=e2b24c1f20d4812a13cf86e076eef850cf8500d3;hb=4f9b5cd4268d3e28ac54748c4871e07f38acfd4c;hp=f72590085bf442d66df55e82f320067ce89dc12e;hpb=77af6d16968262049d6dadfb5521af7a8a7c6868;p=sbcl.git diff --git a/src/runtime/interrupt.h b/src/runtime/interrupt.h index f725900..e2b24c1 100644 --- a/src/runtime/interrupt.h +++ b/src/runtime/interrupt.h @@ -13,62 +13,130 @@ #define _INCLUDE_INTERRUPT_H_ #include +#include + +/* + * This is a workaround for some slightly silly Linux/GNU Libc + * behaviour: glibc defines sigset_t to support 1024 signals, which is + * more than the kernel. This is usually not a problem, but becomes + * one when we want to save a signal mask from a ucontext, and restore + * it later into another ucontext: the ucontext is allocated on the + * stack by the kernel, so copying a libc-sized sigset_t into it will + * overflow and cause other data on the stack to be corrupted */ +/* FIXME: do not rely on NSIG being a multiple of 8 */ +#define REAL_SIGSET_SIZE_BYTES ((NSIG/8)) + +/* Set all deferrable signals into *s. */ +extern void sigaddset_deferrable(sigset_t *s); +/* Set all blockable signals into *s. */ +extern void sigaddset_blockable(sigset_t *s); +/* Set all gc signals into *s. */ +extern void sigaddset_gc(sigset_t *s); + +extern sigset_t deferrable_sigset; +extern sigset_t blockable_sigset; +extern sigset_t gc_sigset; + +extern void block_blockable_signals(void); +extern void unblock_deferrable_signals(void); +extern void unblock_gc_signals(void); + +extern void check_deferrables_blocked_or_lose(void); +extern void check_blockables_blocked_or_lose(void); +extern void check_gc_signals_unblocked_or_lose(void); +extern void check_gc_signals_unblocked_in_sigset_or_lose(sigset_t *sigset); + +static inline void +sigcopyset(sigset_t *new, sigset_t *old) +{ + memcpy(new, old, REAL_SIGSET_SIZE_BYTES); +} /* maximum signal nesting depth * - * Note: In CMU CL, this was 4096, but there was no explanation given, - * and it's hard to see why we'd need that many nested interrupts, so - * I've scaled it back (to 256) to see what happens. -- WHN 20000730 - - * Nothing happened, so let's creep it back a bit further -- dan 20030411 */ -#define MAX_INTERRUPTS 32 + * FIXME: In CMUCL this was 4096, and it was first scaled down to 256 + * and then 32, until finally Stumpwm broke: it is possible to receive + * interrupts in sufficiently quick succession that handler nesting + * can become preposterous. Scaling this back up to 1024 is a bandaid: + * for a real fix we should consider the following things: + * + * We should almost certainly always use + * arrange_return_to_lisp_function, though it needs to be thought + * about arguments, and it needs to be able to pass a frobbable + * context to the callee... + * + * There are cases when nesting handlers is exactly what we want: + * eg. SIGINT. + * + * There are cases when we probably want to drop duplicate signals + * on the floor if they arrive before the previous one has been handled. + * Eg. SIGPROF. + * + * There are cases when we probably want to handle duplicate signals + * after the previous handler has returned, not before. Eg. SIGALARM. + * + * -- NS 2007-01-29 + */ +#define MAX_INTERRUPTS 1024 union interrupt_handler { lispobj lisp; void (*c)(int, siginfo_t*, void*); }; -struct interrupt_data { - void (*interrupt_low_level_handlers[NSIG]) (int, siginfo_t*, void*) ; - union interrupt_handler interrupt_handlers[NSIG]; +extern union interrupt_handler interrupt_handlers[NSIG]; - /* signal number, siginfo_t, and old mask information for pending - * signal. pending_signal=0 when there is no pending signal. */ - int pending_signal ; +struct interrupt_data { + /* signal information for pending signal. pending_signal=0 when there + * is no pending signal. */ + void (*pending_handler) (int, siginfo_t*, void*) ; + int pending_signal; siginfo_t pending_info; sigset_t pending_mask; }; - -extern void interrupt_init(); +extern boolean interrupt_handler_pending_p(void); +extern void interrupt_init(void); extern void fake_foreign_function_call(os_context_t* context); extern void undo_fake_foreign_function_call(os_context_t* context); -extern void interrupt_handle_now(int, siginfo_t*, void*); +extern void arrange_return_to_lisp_function(os_context_t *, lispobj); +extern void interrupt_handle_now(int, siginfo_t*, os_context_t*); extern void interrupt_handle_pending(os_context_t*); -extern void interrupt_internal_error(int, siginfo_t*, os_context_t*, - boolean continuable); -extern boolean handle_control_stack_guard_triggered(os_context_t *,void *); -extern boolean interrupt_maybe_gc(int, siginfo_t*, void*); +extern void interrupt_internal_error(os_context_t*, boolean continuable); +extern boolean handle_guard_page_triggered(os_context_t *,os_vm_address_t); +extern boolean maybe_defer_handler(void *handler, struct interrupt_data *data, + int signal, siginfo_t *info, + os_context_t *context); +#if defined LISP_FEATURE_GENCGC +/* assembly language stub that executes trap_PendingInterrupt */ +extern void do_pending_interrupt(void); +#endif + #ifdef LISP_FEATURE_SB_THREAD -extern boolean handle_rt_signal(int, siginfo_t*, void*); +extern void interrupt_thread_handler(int, siginfo_t*, void*); +extern void sig_stop_for_gc_handler(int, siginfo_t*, void*); #endif -extern void undoably_install_low_level_interrupt_handler (int signal, - void - handler(int, - siginfo_t*, - void*)); +typedef void (*interrupt_handler_t)(int, siginfo_t *, void *); +extern void undoably_install_low_level_interrupt_handler ( + int signal, + interrupt_handler_t handler); extern unsigned long install_handler(int signal, - void handler(int, siginfo_t*, void*)); + interrupt_handler_t handler); extern union interrupt_handler interrupt_handlers[NSIG]; -/* Set all blockable signals into *s. */ -void sigaddset_blockable(sigset_t *s); - /* The void* casting here avoids having to mess with the various types * of function argument lists possible for signal handlers: * SA_SIGACTION handlers have one signature, and the default old-style * signal(..) handlers have another, and attempting to represent them * "cleanly" with union types is in fact a mess. */ #define ARE_SAME_HANDLER(x, y) ((void*)(x) == (void*)(y)) + +extern void handle_trap(os_context_t *context, int trap); + +#ifndef LISP_FEATURE_WIN32 +extern void lisp_memory_fault_error(os_context_t *context, + os_vm_address_t addr); +#endif + #endif