| #include <pthread.h> |
| #include <stdio.h> |
| #include <stddef.h> |
| #include <unistd.h> |
| |
| pthread_mutex_t Mtx; |
| int Global; |
| |
| void *Thread1(void *x) { |
| pthread_mutex_init(&Mtx, 0); |
| pthread_mutex_lock(&Mtx); |
| Global = 42; |
| pthread_mutex_unlock(&Mtx); |
| return NULL; |
| } |
| |
| void *Thread2(void *x) { |
| usleep(1000000); |
| pthread_mutex_lock(&Mtx); |
| Global = 43; |
| pthread_mutex_unlock(&Mtx); |
| return NULL; |
| } |
| |
| int main() { |
| 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); |
| pthread_mutex_destroy(&Mtx); |
| return 0; |
| } |
| |
| // CHECK: WARNING: ThreadSanitizer: data race |
| // CHECK-NEXT: Read of size 1 at {{.*}} by thread 2: |
| // CHECK-NEXT: #0 pthread_mutex_lock {{.*}} ({{.*}}) |
| // CHECK-NEXT: #1 Thread2 {{.*}}race_on_mutex.c:19 ({{.*}}) |
| // CHECK-NEXT: Previous write of size 1 at {{.*}} by thread 1: |
| // CHECK-NEXT: #0 pthread_mutex_init {{.*}} ({{.*}}) |
| // CHECK-NEXT: #1 Thread1 {{.*}}race_on_mutex.c:10 ({{.*}}) |
| |