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// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <pthread.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
static void *racer(void *p) {
*(int*)p = 42;
return 0;
}
int main() {
switch (fork()) {
default: // parent
while (wait(0) < 0) {}
break;
case 0: // child
{
int x = 0;
pthread_t th1, th2;
pthread_create(&th1, 0, racer, &x);
pthread_create(&th2, 0, racer, &x);
pthread_join(th1, 0);
pthread_join(th2, 0);
exit(0);
break;
}
case -1: // error
fprintf(stderr, "failed to fork (%d)\n", errno);
exit(1);
}
fprintf(stderr, "OK\n");
}
// CHECK: ThreadSanitizer: data race
// CHECK: OK
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