1// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2#include <pthread.h>
3#include <stdlib.h>
4#include <stdio.h>
5#include <unistd.h>
6#include <errno.h>
7
8pthread_mutex_t m;
9int x;
10
11void *thr(void *p) {
12 pthread_mutex_lock(mutex: &m);
13 x = 42;
14 return 0;
15}
16
17int main() {
18 pthread_mutexattr_t a;
19 pthread_mutexattr_init(attr: &a);
20 pthread_mutexattr_setrobust(attr: &a, robustness: PTHREAD_MUTEX_ROBUST);
21 pthread_mutex_init(mutex: &m, mutexattr: &a);
22 pthread_t th;
23 pthread_create(newthread: &th, attr: 0, start_routine: thr, arg: 0);
24 sleep(seconds: 1);
25 if (pthread_mutex_trylock(mutex: &m) != EOWNERDEAD) {
26 fprintf(stderr, format: "not EOWNERDEAD\n");
27 exit(status: 1);
28 }
29 x = 43;
30 pthread_join(th: th, thread_return: 0);
31 fprintf(stderr, format: "DONE\n");
32}
33
34// This is a false positive, tsan must not bark at the data race.
35// But currently it does.
36// CHECK-NOT: WARNING: ThreadSanitizer WARNING: double lock of mutex
37// CHECK: WARNING: ThreadSanitizer: data race
38// CHECK-NOT: EOWNERDEAD
39// CHECK: DONE
40// CHECK-NOT: WARNING: ThreadSanitizer
41
42

source code of compiler-rt/test/tsan/Linux/mutex_robust2.cpp