1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 // Race between an aligned access and an unaligned access, which 3 // touches the same memory region. 4 // This is a real race which is not detected by tsan. 5 // https://code.google.com/p/thread-sanitizer/issues/detail?id=17 6 #include <pthread.h> 7 #include <stdio.h> 8 #include <stdint.h> 9 10 uint64_t Global[2]; 11 Thread1(void * x)12void *Thread1(void *x) { 13 Global[1]++; 14 return NULL; 15 } 16 Thread2(void * x)17void *Thread2(void *x) { 18 char *p1 = reinterpret_cast<char *>(&Global[0]); 19 uint64_t *p4 = reinterpret_cast<uint64_t *>(p1 + 1); 20 (*p4)++; 21 return NULL; 22 } 23 main()24int main() { 25 pthread_t t[2]; 26 pthread_create(&t[0], NULL, Thread1, NULL); 27 pthread_create(&t[1], NULL, Thread2, NULL); 28 pthread_join(t[0], NULL); 29 pthread_join(t[1], NULL); 30 printf("Pass\n"); 31 // CHECK-NOT: ThreadSanitizer: data race 32 // CHECK: Pass 33 return 0; 34 } 35