1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 // RUN: %clangxx_tsan -O2 %s -o %t && %run %t 2>&1 | FileCheck %s 3 // RUN: %clangxx_tsan -O3 %s -o %t && %run %t 2>&1 | FileCheck %s 4 // 5 // Check that load widening is not tsan-hostile. 6 #include <pthread.h> 7 #include <stdio.h> 8 #include <string.h> 9 10 struct { 11 int i; 12 char c1, c2, c3, c4; 13 } S; 14 15 int G; 16 17 void *Thread1(void *x) { 18 G = S.c1 + S.c3; 19 return NULL; 20 } 21 22 void *Thread2(void *x) { 23 S.c2 = 1; 24 return NULL; 25 } 26 27 int main() { 28 pthread_t t[2]; 29 memset(&S, 123, sizeof(S)); 30 pthread_create(&t[0], NULL, Thread1, NULL); 31 pthread_create(&t[1], NULL, Thread2, NULL); 32 pthread_join(t[0], NULL); 33 pthread_join(t[1], NULL); 34 printf("PASS\n"); 35 } 36 37 // CHECK-NOT: WARNING: ThreadSanitizer: data race 38 // CHECK: PASS 39
