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      1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
      2 #include <pthread.h>
      3 #include <stdio.h>
      4 #include <unistd.h>
      5 #include <sys/types.h>
      6 #include <sys/stat.h>
      7 #include <fcntl.h>
      8 
      9 int fds[2];
     10 
     11 void *Thread1(void *x) {
     12   char buf;
     13   read(fds[0], &buf, 1);
     14   close(fds[0]);
     15   return 0;
     16 }
     17 
     18 void *Thread2(void *x) {
     19   close(fds[1]);
     20   return 0;
     21 }
     22 
     23 int main() {
     24   fds[0] = open("/dev/random", O_RDONLY);
     25   fds[1] = dup2(fds[0], 100);
     26   pthread_t t[2];
     27   pthread_create(&t[0], NULL, Thread1, NULL);
     28   pthread_create(&t[1], NULL, Thread2, NULL);
     29   pthread_join(t[0], NULL);
     30   pthread_join(t[1], NULL);
     31   printf("OK\n");
     32 }
     33 
     34 // CHECK-NOT: WARNING: ThreadSanitizer: data race
     35