Re: Signals and threads

Hello Thomas,

Finally, how do you send the SIGUSR1 to your threadA?

its pthread_kill(threadId,SIGUSR1);

It is difficult for us to help you, as we (obviously) do not have the
particular version "libpthread" that you have...

Could you please compile the program below and send us the
corresponding trace file:
$ strace -f -o trace.txt binaryName

Thanks,
Loic.

/*
compile: gcc -pthread try.c -o try
trace : strace -f -o trace.txt ./try
*/
#include <pthread.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <assert.h>

void
handlerOne(int signo)
{
write(STDOUT_FILENO, "1", 1);
}

void
handlerTwo(int signo)
{
write(STDOUT_FILENO, "2", 1);
}

typedef void (*sighand_t)(int);

void*
thread(void* arg)
{
struct sigaction act;
sigset_t set;

sigemptyset(&set);
sigaddset(&set, SIGUSR1);
act.sa_handler = (sighand_t) arg;
act.sa_mask = set;
act.sa_flags = 0;
sigaction(SIGUSR1, &act, 0);
for (;;) {
sleep(1000);
}
return 0;
}

int main()
{
pthread_t tid1, tid2;

int rc = pthread_create(&tid1, 0, thread, (void*) handlerOne );
assert (rc==0 && "pthread_create");
sleep(1);
rc = pthread_create(&tid2, 0, thread, (void*) handlerTwo);
assert (rc==0 && "pthread_create");

sleep(1);
pthread_kill(tid1, SIGUSR1);
sleep(1);
pthread_kill(tid2, SIGUSR1);

sleep(1);
return 0;
}

.

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