1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s 2 #include "test.h" 3 #include <sys/types.h> 4 #include <sys/stat.h> 5 #include <fcntl.h> 6 7 // dup2(oldfd, newfd) races with close(newfd). 8 9 int fd; 10 11 void *Thread(void *x) { 12 barrier_wait(&barrier); 13 if (close(fd) == -1) 14 exit(printf("close failed\n")); 15 return 0; 16 } 17 18 int main() { 19 barrier_init(&barrier, 2); 20 fd = open("/dev/random", O_RDONLY); 21 int fd2 = open("/dev/random", O_RDONLY); 22 if (fd == -1 || fd2 == -1) 23 exit(printf("open failed\n")); 24 pthread_t th; 25 pthread_create(&th, 0, Thread, 0); 26 if (dup2(fd2, fd) == -1) 27 exit(printf("dup2 failed\n")); 28 barrier_wait(&barrier); 29 pthread_join(th, 0); 30 fprintf(stderr, "DONE\n"); 31 } 32 33 // CHECK: WARNING: ThreadSanitizer: data race 34
