memcpy_race.cpp
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// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
#include "test.h"
#include <string.h>
char *data = new char[10];
char *data1 = new char[10];
char *data2 = new char[10];
void *Thread1(void *x) {
static volatile int size = 1;
memcpy(data+5, data1, size);
barrier_wait(&barrier);
return NULL;
}
void *Thread2(void *x) {
static volatile int size = 4;
barrier_wait(&barrier);
memcpy(data+3, data2, size);
return NULL;
}
int main() {
barrier_init(&barrier, 2);
print_address("addr=", 1, &data[5]);
pthread_t t[2];
pthread_create(&t[0], NULL, Thread1, NULL);
pthread_create(&t[1], NULL, Thread2, NULL);
pthread_join(t[0], NULL);
pthread_join(t[1], NULL);
return 0;
}
// CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
// CHECK: WARNING: ThreadSanitizer: data race
// CHECK: Write of size 1 at [[ADDR]] by thread T2:
// CHECK: #0 {{(memcpy|memmove)}}
// CHECK: #1 Thread2
// CHECK: Previous write of size 1 at [[ADDR]] by thread T1:
// CHECK: #0 {{(memcpy|memmove)}}
// CHECK: #1 Thread1