39 lines · cpp
1// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s2// RUN: %clangxx_tsan -O2 %s -o %t && %run %t 2>&1 | FileCheck %s3// RUN: %clangxx_tsan -O3 %s -o %t && %run %t 2>&1 | FileCheck %s4//5// Check that load widening is not tsan-hostile.6#include <pthread.h>7#include <stdio.h>8#include <string.h>9 10struct {11 int i;12 char c1, c2, c3, c4;13} S;14 15int G;16 17void *Thread1(void *x) {18 G = S.c1 + S.c3;19 return NULL;20}21 22void *Thread2(void *x) {23 S.c2 = 1;24 return NULL;25}26 27int 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 fprintf(stderr, "PASS\n");35}36 37// CHECK-NOT: WARNING: ThreadSanitizer: data race38// CHECK: PASS39