compiler-rt/test/tsan/fd_socketpair_norace.cpp

   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/socket.h>
   7
   8 int fds[2];
   9 int X;
  10
  11 void *Thread1(void *x) {
  12   X = 42;
  13   write(fds[1], "a", 1);
  14   close(fds[1]);
  15   return NULL;
  16 }
  17
  18 void *Thread2(void *x) {
  19   char buf;
  20   while (read(fds[0], &buf, 1) != 1) {
  21   }
  22   X = 43;
  23   close(fds[0]);
  24   return NULL;
  25 }
  26
  27 int main() {
  28   socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
  29   pthread_t t[2];
  30   pthread_create(&t[0], NULL, Thread1, NULL);
  31   pthread_create(&t[1], NULL, Thread2, NULL);
  32   pthread_join(t[0], NULL);
  33   pthread_join(t[1], NULL);
  34   fprintf(stderr, "OK\n");
  35 }
  36
  37 // CHECK-NOT: WARNING: ThreadSanitizer: data race