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Redis software watchdog.

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This commit is contained in:
antirez
2012-03-27 11:47:51 +02:00
parent a323870450
commit 39bd025c29
4 changed files with 80 additions and 3 deletions
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65
src/debug.c
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@ -661,11 +661,72 @@ void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
/* Make sure we exit with the right signal at the end. So for instance
* the core will be dumped if enabled. */
sigemptyset (&act.sa_mask);
/* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction
* is used. Otherwise, sa_handler is used */
act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND;
act.sa_handler = SIG_DFL;
sigaction (sig, &act, NULL);
kill(getpid(),sig);
}
#endif /* HAVE_BACKTRACE */
/* =========================== Software Watchdog ============================ */
#include <sys/time.h>
void watchdogSignalHandler(int sig, siginfo_t *info, void *secret) {
ucontext_t *uc = (ucontext_t*) secret;
REDIS_NOTUSED(info);
REDIS_NOTUSED(sig);
/* Log INFO and CLIENT LIST */
redisLog(REDIS_WARNING, "--- WATCHDOG TIMER EXPIRED ---");
#ifdef HAVE_BACKTRACE
logStackTrace(uc);
redisLog(REDIS_WARNING, "------");
#endif
}
/* Schedule a SIGALRM delivery after the specified period in milliseconds.
* If a timer is already scheduled, this function will re-schedule it to the
* specified time. If period is 0 the current timer is disabled. */
void watchdogScheduleSignal(int period) {
struct itimerval it;
/* Will stop the timer if period is 0. */
it.it_value.tv_sec = period/1000;
it.it_value.tv_usec = period%1000;
/* Don't automatically restart. */
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 0;
setitimer(ITIMER_REAL, &it, NULL);
}
/* Enable the software watchdong with the specified period in milliseconds. */
void enableWatchdog(int period) {
if (server.watchdog_period == 0) {
struct sigaction act;
/* Watchdog was actually disabled, so we have to setup the signal
* handler. */
sigemptyset(&act.sa_mask);
act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_SIGINFO;
act.sa_sigaction = watchdogSignalHandler;
sigaction(SIGALRM, &act, NULL);
}
if (period < 200) period = 200; /* We don't accept periods < 200 ms. */
watchdogScheduleSignal(period); /* Adjust the current timer. */
server.watchdog_period = period;
}
/* Disable the software watchdog. */
void disableWatchdog(void) {
struct sigaction act;
if (server.watchdog_period == 0) return; /* Already disabled. */
watchdogScheduleSignal(0); /* Stop the current timer. */
/* Set the signal handler to SIG_IGN, this will also remove pending
* signals from the queue. */
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = SIG_IGN;
sigaction(SIGALRM, &act, NULL);
server.watchdog_period = 0;
}