使用线程同步打印数字的顺序
#include #include #include #include pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; pthread_cond_t* cond = NULL; int threads; volatile int count = 0; void* sync_thread(void* num) { //this function is used to synchronize the threads int thread_number = *(int*)num; while (1) { pthread_mutex_lock(&mutex); //lock the section if (thread_number != count) { //if the thread number is not same as count, put all thread except one into waiting state pthread_cond_wait(&cond[thread_number], &mutex); } printf("%d ", thread_number + 1); //print the thread number count = (count+1)%(threads); // notify the next thread pthread_cond_signal(&cond[count]); pthread_mutex_unlock(&mutex); } return NULL; } int main() { pthread_t* thread_id; volatile int i; int* thread_arr; printf("
