Created
May 31, 2013 08:40
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Using signal and `pthread_kill` to terminate specific thread. `pthread_sigmask` can be used in thread to block signal temporarily.
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <signal.h> | |
#include <unistd.h> | |
#include <pthread.h> | |
#include <time.h> | |
static void debug(const char *msg) { | |
time_t t = time(NULL); | |
fprintf(stderr, "%s%s\n\n", ctime(&t), msg); | |
} | |
static void handler(int signum) | |
{ | |
pthread_exit(NULL); | |
} | |
void *thread(void *arg) | |
{ | |
static sigset_t mask; | |
sigemptyset(&mask); | |
sigaddset(&mask, SIGUSR1); | |
debug("Blocking SIGUSR1 in thread..."); | |
if (pthread_sigmask(SIG_BLOCK, &mask, NULL) != 0) { | |
perror("pthread_sigmask"); | |
exit(1); | |
} | |
debug("Do something..."); | |
sleep(10); | |
debug("Unblocking SIGUSR1 in thread..."); | |
if (pthread_sigmask(SIG_UNBLOCK, &mask, NULL) != 0) { | |
perror("pthread_sigmask"); | |
exit(1); | |
} | |
debug("Will not reach here..."); | |
return NULL; | |
} | |
int main(int argc, char *argv[]) | |
{ | |
pthread_t tid; | |
signal(SIGUSR1, handler); | |
if (pthread_create(&tid, NULL, thread, NULL) != 0) { | |
perror("pthread_create"); | |
exit(1); | |
} | |
sleep(5); | |
debug("Sending SIGUSR1 to thread..."); | |
pthread_kill(tid, SIGUSR1); | |
pthread_join(tid, NULL); | |
debug("Thread exited."); | |
return 0; | |
} |
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keep in mind that
pthread_exit
is not a async-signal-safe function and shouldn't be called from a signal handler (http://man7.org/linux/man-pages/man7/signal-safety.7.html)