// 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:
