/* 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 5038 2006-06-19 22:22:34Z 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_sigquit(int sig, siginfo_t *siginfo, void *_p);
-void signal_handler_sigint(int sig, siginfo_t *siginfo, void *_p);
-void signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p);
+void signal_handler_sighup(int sig, siginfo_t *siginfo, void *_p);
/* signal_init *****************************************************************
void signal_init(void)
{
+#if !defined(__CYGWIN__)
+ int pagesize;
+ sigset_t mask;
struct sigaction act;
- /* install signal handlers we need to convert to exceptions */
+ /* mmap a memory page at address 0x0, so our hardware-exceptions
+ work. */
- sigemptyset(&act.sa_mask);
+ pagesize = getpagesize();
+ (void) memory_mmap_anon(NULL, pagesize, PROT_NONE, MAP_PRIVATE | MAP_FIXED);
-#if defined(ENABLE_JIT)
-# if defined(ENABLE_INTRP)
- if (!opt_intrp) {
-# endif
- /* catch NullPointerException/StackOverFlowException */
+ /* Block the following signals (SIGINT for <ctrl>-c, SIGQUIT for
+ <ctrl>-\). We enable them later in signal_thread, but only for
+ this thread. */
- if (!checknull) {
- act.sa_sigaction = md_signal_handler_sigsegv;
- act.sa_flags = SA_NODEFER | SA_SIGINFO;
+ if (sigemptyset(&mask) != 0)
+ vm_abort("signal_init: sigemptyset failed: %s", strerror(errno));
-#if defined(SIGSEGV)
- sigaction(SIGSEGV, &act, NULL);
-#endif
+ if (sigaddset(&mask, SIGINT) != 0)
+ vm_abort("signal_init: sigaddset failed: %s", strerror(errno));
-#if defined(SIGBUS)
- sigaction(SIGBUS, &act, NULL);
+#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));
- /* catch ArithmeticException */
+#if defined(ENABLE_GC_BOEHM)
+ /* Allocate something so the garbage collector's signal handlers
+ are installed. */
-#if defined(__I386__) || defined(__X86_64__)
- act.sa_sigaction = md_signal_handler_sigfpe;
- act.sa_flags = SA_NODEFER | SA_SIGINFO;
- sigaction(SIGFPE, &act, NULL);
+ (void) GCNEW(u1);
#endif
+
+ /* Install signal handlers for signals we want to catch in all
+ threads. */
+
+ sigemptyset(&act.sa_mask);
+
+#if defined(ENABLE_JIT)
# if defined(ENABLE_INTRP)
- }
+ if (!opt_intrp) {
# endif
-#endif /* !defined(ENABLE_INTRP) */
+ /* SIGSEGV handler */
+ act.sa_sigaction = md_signal_handler_sigsegv;
+ act.sa_flags = SA_NODEFER | SA_SIGINFO;
- /* catch SIGINT for exiting properly on <ctrl>-c */
+# if defined(SIGSEGV)
+ sigaction(SIGSEGV, &act, NULL);
+# endif
- act.sa_sigaction = signal_handler_sigint;
- act.sa_flags = SA_NODEFER | SA_SIGINFO;
- sigaction(SIGINT, &act, NULL);
+# if defined(SIGBUS)
+ sigaction(SIGBUS, &act, NULL);
+# endif
+# if SUPPORT_HARDWARE_DIVIDE_BY_ZERO
+ /* SIGFPE handler */
- /* catch SIGQUIT for thread dump */
+ act.sa_sigaction = md_signal_handler_sigfpe;
+ act.sa_flags = SA_NODEFER | SA_SIGINFO;
+ sigaction(SIGFPE, &act, NULL);
+# endif
-#if defined(ENABLE_THREADS)
-#if !defined(__FREEBSD__)
- act.sa_sigaction = signal_handler_sigquit;
- act.sa_flags = SA_SIGINFO;
- sigaction(SIGQUIT, &act, NULL);
+# if defined(__ARM__)
+ /* XXX use better defines for that (in arch.h) */
+ /* SIGILL handler */
- /* XXX boehm uses SIGUSR1 for suspend on freebsd */
+ act.sa_sigaction = md_signal_handler_sigill;
+ act.sa_flags = SA_NODEFER | SA_SIGINFO;
+ sigaction(SIGILL, &act, NULL);
+# endif
- act.sa_sigaction = signal_handler_sigusr1;
- act.sa_flags = SA_SIGINFO;
- sigaction(SIGUSR1, &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)
+ /* SIGHUP handler for threads_thread_interrupt */
+
+ act.sa_sigaction = signal_handler_sighup;
+ act.sa_flags = 0;
+ sigaction(SIGHUP, &act, NULL);
#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;
+ act.sa_flags = SA_SIGINFO;
sigaction(SIGUSR2, &act, NULL);
#endif
+
+#endif /* !defined(__CYGWIN__) */
}
-/* signal_handler_sigquit ******************************************************
+/* signal_thread ************************************************************
- XXX
+ 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_sigquit(int sig, siginfo_t *siginfo, void *_p)
+static void signal_thread(void)
{
- /* do thread dump */
+ sigset_t mask;
+ int sig;
- threads_dump();
-}
+ 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 */
+
+ (void) sigwait(&mask, &sig);
-/* signal_handler_sigint *******************************************************
+ switch (sig) {
+ case SIGINT:
+ /* exit the vm properly */
- Handler for SIGINT (<ctrl>-c) which shuts down CACAO properly with
- Runtime.exit(I)V.
+ vm_exit(0);
+ break;
+
+ case SIGQUIT:
+ /* print a thread dump */
+#if defined(ENABLE_THREADS)
+ threads_dump();
+#endif
+
+#if defined(ENABLE_STATISTICS)
+ if (opt_stat)
+ statistics_print_memory_usage();
+#endif
+ break;
+ }
+ }
+
+ /* this should not happen */
+
+ vm_abort("signal_thread: this thread should not exit!");
+}
+
+
+/* signal_start_thread *********************************************************
+
+ 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");
+
+ thread_signal = threads_create_thread(name);
+
+ if (thread_signal == NULL)
+ return false;
- /* exit the vm properly */
+ /* actually start the signal handler thread */
- vm_exit(0);
+ threads_start_thread(thread_signal, signal_thread);
+
+ /* everything's ok */
+
+ return true;
+#else
+#warning FIX ME!
+#endif
}
-/* signal_handler_sigusr1 ******************************************************
+/* signal_handler_sighup *******************************************************
- XXX
+ This handler is required by threads_thread_interrupt and does
+ nothing.
*******************************************************************************/
#if defined(ENABLE_THREADS)
-void signal_handler_sigusr1(int sig, siginfo_t *siginfo, void *_p)
+void signal_handler_sighup(int sig, siginfo_t *siginfo, void *_p)
{
- /* call stacktrace function */
-
- stacktrace_dump_trace();
+ /* do nothing */
}
#endif
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