test/tsan/thread_name2.cc

// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>

#if defined(__FreeBSD__)
#include <pthread_np.h>
#define pthread_setname_np pthread_set_name_np
#endif

int Global;

void *Thread1(void *x) {
  sleep(1);
  Global++;
  return 0;
}

void *Thread2(void *x) {
  pthread_setname_np(pthread_self(), "foobar2");
  Global--;
  return 0;
}

int main() {
  pthread_t t[2];
  pthread_create(&t[0], 0, Thread1, 0);
  pthread_create(&t[1], 0, Thread2, 0);
  pthread_setname_np(t[0], "foobar1");
  pthread_join(t[0], NULL);
  pthread_join(t[1], NULL);
}

// CHECK: WARNING: ThreadSanitizer: data race
// CHECK:   Thread T1 'foobar1'
// CHECK:   Thread T2 'foobar2'