test/tsan/fd_pipe_norace.cc

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
   2 #include <pthread.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5
   6 int fds[2];
   7 int X;
   8
   9 void *Thread1(void *x) {
  10   X = 42;
  11   write(fds[1], "a", 1);
  12   return NULL;
  13 }
  14
  15 void *Thread2(void *x) {
  16   char buf;
  17   while (read(fds[0], &buf, 1) != 1) {
  18   }
  19   X = 43;
  20   return NULL;
  21 }
  22
  23 int main() {
  24   pipe(fds);
  25   pthread_t t[2];
  26   pthread_create(&t[0], NULL, Thread1, NULL);
  27   pthread_create(&t[1], NULL, Thread2, NULL);
  28   pthread_join(t[0], NULL);
  29   pthread_join(t[1], NULL);
  30   printf("OK\n");
  31 }
  32
  33 // CHECK-NOT: WARNING: ThreadSanitizer: data race