#define _INCLUDE_INTERRUPT_H_
#include <signal.h>
+#include <string.h>
+
+/*
+ * 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))
+
+static inline void
+sigcopyset(sigset_t *new, sigset_t *old)
+{
+ memcpy(new, old, REAL_SIGSET_SIZE_BYTES);
+}
+
+extern void get_current_sigmask(sigset_t *sigset);
+
+/* 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 boolean deferrables_blocked_p(sigset_t *sigset);
+extern boolean blockables_blocked_p(sigset_t *sigset);
+extern boolean gc_signals_blocked_p(sigset_t *sigset);
+
+extern void check_deferrables_blocked_or_lose(sigset_t *sigset);
+extern void check_blockables_blocked_or_lose(sigset_t *sigset);
+extern void check_gc_signals_blocked_or_lose(sigset_t *sigset);
+
+extern void check_deferrables_unblocked_or_lose(sigset_t *sigset);
+extern void check_blockables_unblocked_or_lose(sigset_t *sigset);
+extern void check_gc_signals_unblocked_or_lose(sigset_t *sigset);
+
+extern void block_deferrable_signals(sigset_t *where, sigset_t *old);
+extern void block_blockable_signals(sigset_t *where, sigset_t *old);
+extern void block_gc_signals(sigset_t *where, sigset_t *old);
+
+extern void unblock_deferrable_signals(sigset_t *where, sigset_t *old);
+extern void unblock_blockable_signals(sigset_t *where, sigset_t *old);
+extern void unblock_gc_signals(sigset_t *where, sigset_t *old);
+
+extern void maybe_save_gc_mask_and_block_deferrables(sigset_t *sigset);
/* 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 see what happens. -- WHN 20000730 */
-#define MAX_INTERRUPTS 256
-
-extern os_context_t *lisp_interrupt_contexts[MAX_INTERRUPTS];
+ * 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*);
+ void (*c)(int, siginfo_t*, os_context_t*);
};
+extern union interrupt_handler interrupt_handlers[NSIG];
+
+struct interrupt_data {
+ /* signal information for pending signal. pending_signal=0 when there
+ * is no pending signal. */
+ void (*pending_handler) (int, siginfo_t*, os_context_t*) ;
+ int pending_signal;
+ siginfo_t pending_info;
+ sigset_t pending_mask;
+ /* Was pending mask saved for gc request? True if GC_PENDING or
+ * SIG_STOP_FOR_GC happened in a pseudo atomic with no GC_INHIBIT
+ * NIL. Both deferrable interrupt handlers and gc are careful not
+ * to clobber each other's pending_mask. */
+ boolean gc_blocked_deferrables;
+#ifdef LISP_FEATURE_PPC
+ /* On PPC when consing wants to turn to alloc(), it does so via a
+ * trap. When alloc() wants to save the sigmask it consults
+ * allocation_trap_context. It does not look up the most recent
+ * context, because alloc() can be called from other places
+ * too. */
+ os_context_t *allocation_trap_context;
+#endif
+};
+
+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 undoably_install_low_level_interrupt_handler (int signal,
- void
- handler(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 void sig_stop_for_gc_handler(int, siginfo_t*, os_context_t*);
+#endif
+typedef void (*interrupt_handler_t)(int, siginfo_t *, os_context_t *);
+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
projects / sbcl.git / blobdiff