1// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | 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 9int X; 10 11void *Thread1(void *x) { 12 sleep(1); 13 int f = open("/dev/random", O_RDONLY); 14 char buf; 15 read(f, &buf, 1); 16 close(f); 17 X = 42; 18 return NULL; 19} 20 21void *Thread2(void *x) { 22 X = 43; 23 write(STDOUT_FILENO, "a", 1); 24 return NULL; 25} 26 27int main() { 28 pthread_t t[2]; 29 pthread_create(&t[0], NULL, Thread1, NULL); 30 pthread_create(&t[1], NULL, Thread2, NULL); 31 pthread_join(t[0], NULL); 32 pthread_join(t[1], NULL); 33} 34 35// CHECK: WARNING: ThreadSanitizer: data race 36// CHECK: Write of size 4 37// CHECK: #0 Thread1 38// CHECK: Previous write of size 4 39// CHECK: #0 Thread2 40 41 42