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#include <assert.h>
#include <unistd.h>
#include <pthread.h>
#include <signal.h>
#include <errno.h>
_Atomic int handler_ready = 0;
_Atomic int thread_signal_ran = 0;
static void sig_handler(int sig, siginfo_t *info, void *ctx) {
(void)sig;
(void)info;
(void)ctx;
thread_signal_ran = 1;
}
static void *worker(void *arg) {
(void)arg;
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_sigaction = sig_handler;
sa.sa_flags = SA_SIGINFO;
assert(!sigaction(SIGUSR1, &sa, NULL));
handler_ready = 1;
sigset_t set;
sigfillset(&set);
sigdelset(&set, SIGUSR1);
assert(sigsuspend(&set));
assert(thread_signal_ran);
assert(errno == EINTR);
return NULL;
}
int main() {
pthread_t thread;
assert(!pthread_create(&thread, NULL, &worker, NULL));
while (!handler_ready)
;
sleep(1);
assert(!pthread_kill(thread, SIGUSR1));
assert(!pthread_join(thread, NULL));
return 0;
}
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