54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
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#include <stdio.h>
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#include <pthread.h>
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#include <unistd.h>
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// 静态初始化互斥锁
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// pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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// 动态初始化锁-定义锁
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pthread_mutex_t mutex;
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void *printer(void *data)
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{
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char *msg = (char *)data;
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int lock_acquired = 0; // 未获取到锁
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while (!lock_acquired) // 未获取到锁的时候，循环尝试获取锁，并处理
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{
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// trylock 非阻塞锁
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if (pthread_mutex_trylock(&mutex) == 0) // 如果拿到锁
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{
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lock_acquired = 1; // 该状态:已获取到锁
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while (*msg) // 当前线程传入的字符串未读取完成时，循环读取
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{
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printf("%c", *msg++);
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fflush(stdout);
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usleep(200 * 1000);
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}
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pthread_mutex_unlock(&mutex); // 读完后，解锁当前进程
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}
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else
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{
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usleep(100); // 0.1 毫秒后继续尝试获取锁
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}
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}
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return NULL;
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}
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int main(int argc, char const **argv)
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{
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// 动态初始化锁-初始化
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pthread_mutex_init(&mutex, NULL);
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pthread_t tid1, tid2;
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pthread_create(&tid1, NULL, printer, "disen666\n");
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pthread_create(&tid2, NULL, printer, "lucy888\n");
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pthread_join(tid1, NULL);
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pthread_join(tid2, NULL);
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printf("\n---over---\n");
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// 销毁互斥锁
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pthread_mutex_destroy(&mutex);
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return 0;
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}
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