36 lines · cpp
1// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s2// Race between an aligned access and an unaligned access, which3// touches the same memory region.4#include "test.h"5#include <stdint.h>6 7uint64_t Global[2];8 9void *Thread1(void *x) {10 Global[1]++;11 barrier_wait(&barrier);12 return NULL;13}14 15void *Thread2(void *x) {16 barrier_wait(&barrier);17 char *p1 = reinterpret_cast<char *>(&Global[0]);18 struct __attribute__((packed, aligned(1))) u_uint64_t { uint64_t val; };19 u_uint64_t *p4 = reinterpret_cast<u_uint64_t *>(p1 + 1);20 (*p4).val++;21 return NULL;22}23 24int main() {25 barrier_init(&barrier, 2);26 pthread_t t[2];27 pthread_create(&t[0], NULL, Thread1, NULL);28 pthread_create(&t[1], NULL, Thread2, NULL);29 pthread_join(t[0], NULL);30 pthread_join(t[1], NULL);31 fprintf(stderr, "Pass\n");32 // CHECK: ThreadSanitizer: data race33 // CHECK: Pass34 return 0;35}36