在这里，我们将看到如何使用不同的线程按正确的顺序打印数字。在这里，我们将创建n个线程，然后对它们进行同步。思路是，第一个线程将打印1，然后第二个线程将打印2，依此类推。当一个线程尝试打印时，它将锁定资源，因此其他线程无法使用该部分。
示例
#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("Enter number of threads: "); scanf("%d", &threads); // allocate memory to cond (conditional variable) thread id's and array of size threads cond = (pthread_cond_t*)malloc(sizeof(pthread_cond_t) * threads); thread_id = (pthread_t*)malloc(sizeof(pthread_t) * threads); thread_arr = (int*)malloc(sizeof(int) * threads); for (i = 0; i < threads; i++) { //create threads thread_arr[i] = i; pthread_create(&thread_id[i], NULL, sync_thread, (void*)&thread_arr[i]); } // waiting for thread for (i = 0; i < threads; i++) { pthread_join(thread_id[i], NULL); } return 0;}
输出
$ g++ test.cpp -lpthread$ ./a.outEnter number of threads: 51 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 34 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 51 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 34 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 12 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 45 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 23 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5.........
以上就是使用线程同步打印数字的顺序的详细内容，更多请关注创想鸟其它相关文章！
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