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#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{{(:3)?}} ({{.*}})
// 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{{(:3)?}} ({{.*}})
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