#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
int Global;
pthread_mutex_t *mtx;
void *Thread1(void *x) {
sleep(1);
pthread_mutex_lock(mtx);
Global++;
pthread_mutex_unlock(mtx);
return NULL;
}
void *Thread2(void *x) {
Global--;
return NULL;
}
int main() {
mtx = new pthread_mutex_t;
pthread_mutex_init(mtx, 0);
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);
delete mtx;
}