1// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s 2// Race between an aligned access and an unaligned access, which 3// 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 printf("Pass\n"); 32 // CHECK: ThreadSanitizer: data race 33 // CHECK: Pass 34 return 0; 35} 36