// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s // UNSUPPORTED: darwin #include <pthread.h> #include <stdio.h> #include <stdlib.h> #include <signal.h> #include <sys/types.h> #include <sys/time.h> #include <unistd.h> #include <errno.h> volatile int X; int stop; static void handler(int sig) { (void)sig; if (X != 0) printf("bad"); } static void* busy(void *p) { while (__atomic_load_n(&stop, __ATOMIC_RELAXED) == 0) { } return 0; } static void* reset(void *p) { struct sigaction act = {}; for (int i = 0; i < 1000000; i++) { act.sa_handler = &handler; if (sigaction(SIGPROF, &act, 0)) { perror("sigaction"); exit(1); } act.sa_handler = SIG_IGN; if (sigaction(SIGPROF, &act, 0)) { perror("sigaction"); exit(1); } } return 0; } int main() { struct sigaction act = {}; act.sa_handler = SIG_IGN; if (sigaction(SIGPROF, &act, 0)) { perror("sigaction"); exit(1); } itimerval t; t.it_value.tv_sec = 0; t.it_value.tv_usec = 10; t.it_interval = t.it_value; if (setitimer(ITIMER_PROF, &t, 0)) { perror("setitimer"); exit(1); } pthread_t th[2]; pthread_create(&th[0], 0, busy, 0); pthread_create(&th[1], 0, reset, 0); pthread_join(th[1], 0); __atomic_store_n(&stop, 1, __ATOMIC_RELAXED); pthread_join(th[0], 0); fprintf(stderr, "DONE\n"); return 0; } // CHECK-NOT: WARNING: ThreadSanitizer: // CHECK: DONE // CHECK-NOT: WARNING: ThreadSanitizer: