1 files changed, 12 insertions, 8 deletions
diff --git a/test/tsan/race_on_read.cc b/test/tsan/race_on_read.cc
index 1ec0522b9035..d388bbacde5b 100644
--- a/test/tsan/race_on_read.cc
+++ b/test/tsan/race_on_read.cc
@@ -1,31 +1,35 @@
 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
-#include <pthread.h>
-#include <stdio.h>
-#include <unistd.h>
+#include "test.h"
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
-#include <unistd.h>
 #include <errno.h>
 
 int fd;
 char buf;
 
-void *Thread(void *x) {
-  sleep(1);
+void *Thread1(void *x) {
+  barrier_wait(&barrier);
   read(fd, &buf, 1);
   return NULL;
 }
 
+void *Thread2(void *x) {
+  read(fd, &buf, 1);
+  barrier_wait(&barrier);
+  return NULL;
+}
+
 int main() {
+  barrier_init(&barrier, 2);
   fd = open("/dev/random", O_RDONLY);
   if (fd < 0) {
     fprintf(stderr, "failed to open /dev/random (%d)\n", errno);
     return 1;
   }
   pthread_t t[2];
-  pthread_create(&t[0], NULL, Thread, NULL);
-  pthread_create(&t[1], NULL, Thread, NULL);
+  pthread_create(&t[0], NULL, Thread1, NULL);
+  pthread_create(&t[1], NULL, Thread2, NULL);
   pthread_join(t[0], NULL);
   pthread_join(t[1], NULL);
   close(fd);