0.9.4.14:

[sbcl.git] / src / runtime / interrupt.h

diff --git a/src/runtime/interrupt.h b/src/runtime/interrupt.h
index 642160e..ec78999 100644 (file)
--- a/src/runtime/interrupt.h
+++ b/src/runtime/interrupt.h
@@ -14,11 +14,28 @@
 
 #include <signal.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);
+}
+
 /* 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 
+ * 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
@@ -28,14 +45,13 @@ union interrupt_handler {
     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 information for pending signal.  pending_signal=0 when there 
+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 ;
+    int pending_signal;
     siginfo_t pending_info;
     sigset_t pending_mask;
 };
@@ -48,27 +64,39 @@ extern void arrange_return_to_lisp_function(os_context_t *, lispobj);
 extern void interrupt_handle_now(int, siginfo_t*, void*);
 extern void interrupt_handle_pending(os_context_t*);
 extern void interrupt_internal_error(int, siginfo_t*, os_context_t*,
-                                    boolean continuable);
-extern boolean handle_guard_page_triggered(os_context_t *,void *);
+                                     boolean continuable);
+extern boolean handle_guard_page_triggered(os_context_t *,os_vm_address_t);
 extern boolean interrupt_maybe_gc(int, siginfo_t*, void*);
+extern boolean interrupt_maybe_gc_int(int, siginfo_t *, void *);
+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 interrupt_thread_handler(int, siginfo_t*, void*);
 extern void sig_stop_for_gc_handler(int, siginfo_t*, void*);
-extern void thread_exit_handler(int, siginfo_t*, void*);
 #endif
 extern void undoably_install_low_level_interrupt_handler (int signal,
-                                                         void
-                                                         handler(int,
-                                                                 siginfo_t*,
-                                                                 void*));
+                                                          void
+                                                          handler(int,
+                                                                  siginfo_t*,
+                                                                  void*));
 extern unsigned long install_handler(int signal,
-                                    void handler(int, siginfo_t*, void*));
+                                     void handler(int, siginfo_t*, void*));
 
 extern union interrupt_handler interrupt_handlers[NSIG];
 
+/* Set all deferrable signals into *s. */
+void sigaddset_deferrable(sigset_t *s);
 /* Set all blockable signals into *s. */
 void sigaddset_blockable(sigset_t *s);
 
+extern void block_blockable_signals();
+
 /* 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
@@ -77,4 +105,3 @@ void sigaddset_blockable(sigset_t *s);
 #define ARE_SAME_HANDLER(x, y) ((void*)(x) == (void*)(y))
 
 #endif
-