Christopher Faylor, le Wed 24 Aug 2005 00:49:55 -0400, a écrit :
> On Tue, Aug 23, 2005 at 10:51:44PM +0200, Samuel Thibault wrote:
> >The attached program doesn't work as expected: if I run it and try to
> >kill it (-15), nothing seem happens. I if comment out
> >pthread_sigmask(), it does work as expected: the handler is called, and
> >threads are interrupted. What's more: if I move pthread_sigmask()
> >after the pause() call in the foo() function, killing works twice, but
> >no more.
>
> This should be fixed in the latest snapshot. Or at least, it seems to
> now properly emulate linux.
Hmm, that's better indeed. But the signal handler is executed in the
wrong thread: the attached program outputs:
thread 0x4601c0
main 0x460008
thread 0x4601c0 awaken
thread 0x4601c0 awaken
thread 0x4601c0 awaken
thread 0x4601c0 awaken
thread 0x4601c0 awaken
thread 0x4601c0 awaken
thread 0x4601c0 awaken
foo 15 0x460008
main awaken
While the main thread asked the signal to be blocked. (It works as
expected on linux 2.6).
Regards,
Samuel
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <pthread.h>
void *foo(void *bar) {
fprintf(stderr,"thread %p\n",pthread_self());
sigset_t blocked;
sigemptyset(&blocked);
sigaddset(&blocked,SIGTERM);
pthread_sigmask(SIG_BLOCK, &blocked,NULL);
while(1) {
pause();
fprintf(stderr,"thread %p awaken\n",pthread_self());
}
}
void handler(int foo) {
fprintf(stderr,"foo %d %p\n",foo, pthread_self());
}
void setsig(int foo) {
struct sigaction action;
memset(&action, 0, sizeof(action));
sigemptyset(&action.sa_mask);
action.sa_handler = handler;
if (sigaction(foo,&action, NULL) == -1)
perror("sigaction");
}
int main(int argc, char *argv[] ) {
pthread_t t;
setsig(SIGTERM);
pthread_create(&t, NULL, foo, NULL);
fprintf(stderr,"main %p\n", pthread_self());
while(1) {
pause();
fprintf(stderr,"main awaken\n");
}
}
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