1  // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
 2  #include <pthread.h>
 3  #include <stdlib.h>
 4  #include <stdio.h>
 5  #include <sched.h>
 6  
 7  struct Cache {
 8    int x;
 9    explicit Cache(int x)
10      : x(x) {
11    }
12  };
13  
14  void *AsyncInit(void *p) {
15    return new Cache((int)(long)p);
16  }
17  
18  Cache *CreateCache() {
19    pthread_t t;
20    pthread_create(&t, 0, AsyncInit, (void*)(long)rand());
21    void *res;
22    pthread_join(t, &res);
23    return (Cache*)res;
24  }
25  
26  void *Thread1(void *x) {
27    static Cache *c = CreateCache();
28    if (c->x >= RAND_MAX)
29      exit(1);
30    return 0;
31  }
32  
33  int main() {
34    pthread_t t[2];
35    pthread_create(&t[0], 0, Thread1, 0);
36    pthread_create(&t[1], 0, Thread1, 0);
37    pthread_join(t[0], 0);
38    pthread_join(t[1], 0);
39    printf("PASS\n");
40  }
41  
42  // CHECK-NOT: WARNING: ThreadSanitizer: data race