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// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
// Test that a signal is not delivered when it is blocked.
#include "test.h"
#include <semaphore.h>
#include <signal.h>
#include <errno.h>
int stop;
sig_atomic_t signal_blocked;
void handler(int signum) {
if (signal_blocked) {
fprintf(stderr, "signal arrived when blocked\n");
exit(1);
}
}
void *thread(void *arg) {
sigset_t myset;
sigemptyset(&myset);
sigaddset(&myset, SIGUSR1);
while (!__atomic_load_n(&stop, __ATOMIC_RELAXED)) {
usleep(1);
if (pthread_sigmask(SIG_BLOCK, &myset, 0)) {
fprintf(stderr, "pthread_sigmask failed %d\n", errno);
exit(1);
}
signal_blocked = 1;
usleep(1);
signal_blocked = 0;
if (pthread_sigmask(SIG_UNBLOCK, &myset, 0)) {
fprintf(stderr, "pthread_sigmask failed %d\n", errno);
exit(1);
}
}
return 0;
}
int main(int argc, char** argv) {
struct sigaction act = {};
act.sa_handler = &handler;
if (sigaction(SIGUSR1, &act, 0)) {
fprintf(stderr, "sigaction failed %d\n", errno);
return 1;
}
pthread_t th;
pthread_create(&th, 0, thread, 0);
for (int i = 0; i < 100000; i++)
pthread_kill(th, SIGUSR1);
__atomic_store_n(&stop, 1, __ATOMIC_RELAXED);
pthread_join(th, 0);
fprintf(stderr, "DONE\n");
return 0;
}
// CHECK-NOT: ThreadSanitizer CHECK
// CHECK-NOT: WARNING: ThreadSanitizer:
// CHECK: DONE
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