-/*
- * mono-threads-posix-signals.c: Shared facility for Posix signals support
+/**
+ * \file
+ * Shared facility for Posix signals support
*
* Author:
* Ludovic Henry (ludovic@gmail.com)
#include <errno.h>
#include <signal.h>
-#include "mono-threads-debug.h"
-
-#if defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
-#define DEFAULT_SUSPEND_SIGNAL SIGXFSZ
-#else
-#define DEFAULT_SUSPEND_SIGNAL SIGPWR
+#ifdef HAVE_ANDROID_LEGACY_SIGNAL_INLINES_H
+#include <android/legacy_signal_inlines.h>
#endif
-#define DEFAULT_RESTART_SIGNAL SIGXCPU
-
-static int abort_signal_num;
-static sigset_t suspend_signal_mask;
-static sigset_t suspend_ack_signal_mask;
+#include "mono-threads-debug.h"
gint
mono_threads_suspend_search_alternative_signal (void)
#endif
}
+static int suspend_signal_num = -1;
+static int restart_signal_num = -1;
+static int abort_signal_num = -1;
+
+static sigset_t suspend_signal_mask;
+static sigset_t suspend_ack_signal_mask;
+
static void
-signal_add_handler (int signo, gpointer handler, int flags)
+signal_add_handler (int signo, void (*handler)(int, siginfo_t *, void *), int flags)
{
-#if defined(__native_client__)
- g_assert_not_reached ();
-#else
- /*FIXME, move the code from mini to utils and do the right thing!*/
struct sigaction sa;
- struct sigaction previous_sa;
int ret;
- sa.sa_sigaction = (void (*)(int, siginfo_t *, void *))handler;
+ sa.sa_sigaction = handler;
sigfillset (&sa.sa_mask);
-
sa.sa_flags = SA_SIGINFO | flags;
- ret = sigaction (signo, &sa, &previous_sa);
-
+ ret = sigaction (signo, &sa, NULL);
g_assert (ret != -1);
-#endif
}
static int
abort_signal_get (void)
{
-#if defined(PLATFORM_ANDROID)
+#if defined(HOST_ANDROID)
return SIGTTIN;
#elif defined (SIGRTMIN)
static int abort_signum = -1;
#elif defined (SIGTTIN)
return SIGTTIN;
#else
- return -1;
+ g_error ("unable to get abort signal");
+#endif
+}
+
+static int
+suspend_signal_get (void)
+{
+#if defined(HOST_ANDROID)
+ return SIGPWR;
+#elif defined (SIGRTMIN)
+ static int suspend_signum = -1;
+ if (suspend_signum == -1)
+ suspend_signum = mono_threads_suspend_search_alternative_signal ();
+ return suspend_signum;
+#else
+#if defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+ return SIGXFSZ;
+#else
+ return SIGPWR;
+#endif
+#endif
+}
+
+static int
+restart_signal_get (void)
+{
+#if defined(HOST_ANDROID)
+ return SIGXCPU;
+#elif defined (SIGRTMIN)
+ static int restart_signum = -1;
+ if (restart_signum == -1)
+ restart_signum = mono_threads_suspend_search_alternative_signal ();
+ return restart_signum;
+#else
+ return SIGXCPU;
#endif
}
static void
restart_signal_handler (int _dummy, siginfo_t *_info, void *context)
{
-#if defined(__native_client__)
- g_assert_not_reached ();
-#else
MonoThreadInfo *info;
int old_errno = errno;
info = mono_thread_info_current ();
- info->signal = DEFAULT_RESTART_SIGNAL;
+ info->signal = restart_signal_num;
errno = old_errno;
-#endif
}
static void
suspend_signal_handler (int _dummy, siginfo_t *info, void *context)
{
-#if defined(__native_client__)
- g_assert_not_reached ();
-#else
int old_errno = errno;
int hp_save_index = mono_hazard_pointer_save_for_signal_handler ();
-
MonoThreadInfo *current = mono_thread_info_current ();
- gboolean ret;
THREADS_SUSPEND_DEBUG ("SIGNAL HANDLER FOR %p [%p]\n", mono_thread_info_get_tid (current), (void*)current->native_handle);
if (current->syscall_break_signal) {
do {
current->signal = 0;
sigsuspend (&suspend_signal_mask);
- } while (current->signal != DEFAULT_RESTART_SIGNAL);
+ } while (current->signal != restart_signal_num);
/* Unblock the restart signal. */
pthread_sigmask (SIG_UNBLOCK, &suspend_ack_signal_mask, NULL);
done:
mono_hazard_pointer_restore_for_signal_handler (hp_save_index);
errno = old_errno;
-#endif
}
void
sigemptyset (&signal_set);
+ /* add suspend signal */
+ suspend_signal_num = suspend_signal_get ();
+
+ signal_add_handler (suspend_signal_num, suspend_signal_handler, SA_RESTART);
+
+ sigaddset (&signal_set, suspend_signal_num);
+
+ /* add restart signal */
+ restart_signal_num = restart_signal_get ();
+
sigfillset (&suspend_signal_mask);
- sigdelset (&suspend_signal_mask, DEFAULT_RESTART_SIGNAL);
+ sigdelset (&suspend_signal_mask, restart_signal_num);
sigemptyset (&suspend_ack_signal_mask);
- sigaddset (&suspend_ack_signal_mask, DEFAULT_RESTART_SIGNAL);
+ sigaddset (&suspend_ack_signal_mask, restart_signal_num);
- signal_add_handler (DEFAULT_SUSPEND_SIGNAL, suspend_signal_handler, SA_RESTART);
- signal_add_handler (DEFAULT_RESTART_SIGNAL, restart_signal_handler, SA_RESTART);
+ signal_add_handler (restart_signal_num, restart_signal_handler, SA_RESTART);
- sigaddset (&signal_set, DEFAULT_SUSPEND_SIGNAL);
- sigaddset (&signal_set, DEFAULT_RESTART_SIGNAL);
+ sigaddset (&signal_set, restart_signal_num);
+ /* add abort signal */
abort_signal_num = abort_signal_get ();
/* the difference between abort and suspend here is made by not
/* ensure all the new signals are unblocked */
sigprocmask (SIG_UNBLOCK, &signal_set, NULL);
+
+ /*
+ On 32bits arm Android, signals with values >=32 are not usable as their headers ship a broken sigset_t.
+ See 5005c6f3fbc1da584c6a550281689cc23f59fe6d for more details.
+ */
+#ifdef HOST_ANDROID
+ g_assert (suspend_signal_num < 32);
+ g_assert (restart_signal_num < 32);
+ g_assert (abort_signal_num < 32);
+#endif
}
gint
mono_threads_suspend_get_suspend_signal (void)
{
- return DEFAULT_SUSPEND_SIGNAL;
+ g_assert (suspend_signal_num != -1);
+ return suspend_signal_num;
}
gint
mono_threads_suspend_get_restart_signal (void)
{
- return DEFAULT_RESTART_SIGNAL;
+ g_assert (restart_signal_num != -1);
+ return restart_signal_num;
}
gint
mono_threads_suspend_get_abort_signal (void)
{
+ g_assert (abort_signal_num != -1);
return abort_signal_num;
}
projects / mono.git / blobdiff