/* src/vm/signal.c - machine independent signal functions
- Copyright (C) 1996-2005, 2006 R. Grafl, A. Krall, C. Kruegel,
+ Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
J. Wenninger, Institut f. Computersprachen - TU Wien
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
- Contact: cacao@cacaojvm.org
-
- Authors: Christian Thalinger
-
- Changes:
-
- $Id: signal.c 5809 2006-10-20 13:09:54Z twisti $
+ $Id: signal.c 7592 2007-03-28 20:12:33Z twisti $
*/
#include "config.h"
+#include <errno.h>
#include <signal.h>
#include <stdlib.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#if defined(__DARWIN__)
+/* If we compile with -ansi on darwin, <sys/types.h> is not
+ included. So let's do it here. */
+# include <sys/types.h>
+#endif
#include "vm/types.h"
+#include "arch.h"
+
+#include "mm/memory.h"
+
#if defined(ENABLE_THREADS)
-# include "threads/native/threads.h"
+# include "threads/threads-common.h"
#endif
#include "vm/signallocal.h"
-#include "vm/options.h"
#include "vm/vm.h"
-#include "vm/jit/stacktrace.h"
+
+#include "vmcore/options.h"
+
+
+/* global variables ***********************************************************/
+
+#if defined(ENABLE_THREADS)
+static threadobject *thread_signal;
+#endif
/* function prototypes ********************************************************/
void signal_handler_sighup(int sig, siginfo_t *siginfo, void *_p);
-void signal_handler_sigint(int sig, siginfo_t *siginfo, void *_p);
-void signal_handler_sigquit(int sig, siginfo_t *siginfo, void *_p);
/* signal_init *****************************************************************
void signal_init(void)
{
#if !defined(__CYGWIN__)
+ int pagesize;
+ sigset_t mask;
struct sigaction act;
+ /* mmap a memory page at address 0x0, so our hardware-exceptions
+ work. */
+
+ pagesize = getpagesize();
+
+ (void) memory_mmap_anon(NULL, pagesize, PROT_NONE, MAP_PRIVATE | MAP_FIXED);
+
+ /* Block the following signals (SIGINT for <ctrl>-c, SIGQUIT for
+ <ctrl>-\). We enable them later in signal_thread, but only for
+ this thread. */
+
+ if (sigemptyset(&mask) != 0)
+ vm_abort("signal_init: sigemptyset failed: %s", strerror(errno));
+
+ if (sigaddset(&mask, SIGINT) != 0)
+ vm_abort("signal_init: sigaddset failed: %s", strerror(errno));
+
+#if !defined(__FREEBSD__)
+ if (sigaddset(&mask, SIGQUIT) != 0)
+ vm_abort("signal_init: sigaddset failed: %s", strerror(errno));
+#endif
+
+ if (sigprocmask(SIG_BLOCK, &mask, NULL) != 0)
+ vm_abort("signal_init: sigprocmask failed: %s", strerror(errno));
+
+#if defined(ENABLE_GC_BOEHM)
/* Allocate something so the garbage collector's signal handlers
are installed. */
(void) GCNEW(u1);
+#endif
- /* install signal handlers we need to convert to exceptions */
+ /* Install signal handlers for signals we want to catch in all
+ threads. */
sigemptyset(&act.sa_mask);
# if defined(ENABLE_INTRP)
if (!opt_intrp) {
# endif
- /* catch NullPointerException/StackOverFlowException */
+ /* SIGSEGV handler */
- if (!checknull) {
- act.sa_sigaction = md_signal_handler_sigsegv;
- act.sa_flags = SA_NODEFER | SA_SIGINFO;
+ act.sa_sigaction = md_signal_handler_sigsegv;
+ act.sa_flags = SA_NODEFER | SA_SIGINFO;
-#if defined(SIGSEGV)
- sigaction(SIGSEGV, &act, NULL);
-#endif
+# if defined(SIGSEGV)
+ sigaction(SIGSEGV, &act, NULL);
+# endif
-#if defined(SIGBUS)
- sigaction(SIGBUS, &act, NULL);
-#endif
- }
+# if defined(SIGBUS)
+ sigaction(SIGBUS, &act, NULL);
+# endif
- /* catch ArithmeticException */
+# if SUPPORT_HARDWARE_DIVIDE_BY_ZERO
+ /* SIGFPE handler */
-#if defined(__I386__) || defined(__X86_64__)
act.sa_sigaction = md_signal_handler_sigfpe;
act.sa_flags = SA_NODEFER | SA_SIGINFO;
sigaction(SIGFPE, &act, NULL);
-#endif
+# endif
+
+# if defined(__ARM__)
+ /* XXX use better defines for that (in arch.h) */
+ /* SIGILL handler */
+
+ act.sa_sigaction = md_signal_handler_sigill;
+ act.sa_flags = SA_NODEFER | SA_SIGINFO;
+ sigaction(SIGILL, &act, NULL);
+# endif
+
+# if defined(__POWERPC__)
+ /* XXX use better defines for that (in arch.h) */
+ /* SIGTRAP handler */
+
+ act.sa_sigaction = md_signal_handler_sigtrap;
+ act.sa_flags = SA_NODEFER | SA_SIGINFO;
+ sigaction(SIGTRAP, &act, NULL);
+# endif
# if defined(ENABLE_INTRP)
}
# endif
#endif /* !defined(ENABLE_INTRP) */
#if defined(ENABLE_THREADS)
- /* catch SIGHUP for threads_thread_interrupt */
+ /* SIGHUP handler for threads_thread_interrupt */
act.sa_sigaction = signal_handler_sighup;
act.sa_flags = 0;
sigaction(SIGHUP, &act, NULL);
#endif
- /* catch SIGINT for exiting properly on <ctrl>-c */
-
- act.sa_sigaction = signal_handler_sigint;
- act.sa_flags = SA_NODEFER | SA_SIGINFO;
- sigaction(SIGINT, &act, NULL);
-
-#if defined(ENABLE_THREADS)
- /* catch SIGQUIT for thread dump */
-
-# if !defined(__FREEBSD__)
- act.sa_sigaction = signal_handler_sigquit;
- act.sa_flags = SA_SIGINFO;
- sigaction(SIGQUIT, &act, NULL);
-# endif
-#endif
-
#if defined(ENABLE_THREADS) && defined(ENABLE_PROFILING)
- /* install signal handler for profiling sampling */
+ /* SIGUSR2 handler for profiling sampling */
act.sa_sigaction = md_signal_handler_sigusr2;
act.sa_flags = SA_SIGINFO;
}
-/* signal_handler_sighup *******************************************************
+/* signal_thread ************************************************************
- This handler is required by threads_thread_interrupt and does
- nothing.
+ This thread sets the signal mask to catch the user input signals
+ (SIGINT, SIGQUIT). We use such a thread, so we don't get the
+ signals on every single thread running. Especially, this makes
+ problems on slow machines.
*******************************************************************************/
-#if defined(ENABLE_THREADS)
-void signal_handler_sighup(int sig, siginfo_t *siginfo, void *_p)
+static void signal_thread(void)
{
- /* do nothing */
-}
+ sigset_t mask;
+ int sig;
+
+ if (sigemptyset(&mask) != 0)
+ vm_abort("signal_thread: sigemptyset failed: %s", strerror(errno));
+
+ sigaddset(&mask, SIGINT);
+#if !defined(__FREEBSD__)
+ sigaddset(&mask, SIGQUIT);
#endif
+ while (true) {
+ /* just wait for a signal */
-/* signal_handler_sigquit ******************************************************
+ (void) sigwait(&mask, &sig);
- Handle for SIGQUIT (<ctrl>-\) which print a stacktrace for every
- running thread.
+ switch (sig) {
+ case SIGINT:
+ /* exit the vm properly */
-*******************************************************************************/
+ vm_exit(0);
+ break;
+ case SIGQUIT:
+ /* print a thread dump */
#if defined(ENABLE_THREADS)
-void signal_handler_sigquit(int sig, siginfo_t *siginfo, void *_p)
-{
- /* do thread dump */
+ threads_dump();
+#endif
- threads_dump();
-}
+#if defined(ENABLE_STATISTICS)
+ if (opt_stat)
+ statistics_print_memory_usage();
#endif
+ break;
+ }
+ }
+ /* this should not happen */
-/* signal_handler_sigint *******************************************************
+ vm_abort("signal_thread: this thread should not exit!");
+}
+
+
+/* signal_start_thread *********************************************************
- Handler for SIGINT (<ctrl>-c) which shuts down CACAO properly with
- Runtime.exit(I)V.
+ Starts the signal handler thread.
*******************************************************************************/
-void signal_handler_sigint(int sig, siginfo_t *siginfo, void *_p)
+bool signal_start_thread(void)
{
- /* if we are already in Runtime.exit(), just do it hardcore */
+#if defined(ENABLE_THREADS)
+ utf *name;
- if (vm_exiting) {
- fprintf(stderr, "Caught SIGINT while already shutting down. Shutdown aborted...\n");
- exit(0);
- }
+ name = utf_new_char("Signal Handler");
- /* exit the vm properly */
+ thread_signal = threads_create_thread(name);
- vm_exit(0);
+ if (thread_signal == NULL)
+ return false;
+
+ /* actually start the signal handler thread */
+
+ threads_start_thread(thread_signal, signal_thread);
+
+ /* everything's ok */
+
+ return true;
+#else
+#warning FIX ME!
+#endif
+}
+
+
+/* signal_handler_sighup *******************************************************
+
+ This handler is required by threads_thread_interrupt and does
+ nothing.
+
+*******************************************************************************/
+
+#if defined(ENABLE_THREADS)
+void signal_handler_sighup(int sig, siginfo_t *siginfo, void *_p)
+{
+ /* do nothing */
}
+#endif
/*
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