翻译这段代码并在每一行后注释： pthread_mutex_init(&mutex, NULL);sem_init( &getok , 0 , 1 ); res = pthread_create(&thrd_readcom, NULL, thrd_rcom, &no); if (res != 0) { printf("Create COM read thread failed\n"); exit(res); } printf("Create threads success\n Waiting for threads to finish...\n"); while(1){ res = sem_wait( &getok ); res = pthread_create( &thrd_writecom , NULL , thrd_wcom , (void *)test); } //等待回收读串口线程 res = pthread_join(thrd_readcom, &thrd_ret); if (!res) { printf("COM read Thread joined\n"); } else { printf("COM read Thread join failed\n"); } //等待回收写串口线程 res = pthread_join(thrd_writecom, &thrd_ret); if (!res) { printf("COM write Thread joined\n"); } else { printf("COM write Thread join failed\n"); } //释放互斥锁 pthread_mutex_destroy(&mutex);

/* 初始化互斥锁 */
pthread_mutex_init(&mutex, NULL);

/* 初始化信号量 */
sem_init(&getok, 0, 1);

/* 创建读串口子线程 */
res = pthread_create(&thrd_readcom, NULL, thrd_rcom, &no);
if (res != 0) {
printf("创建读串口子线程失败\n");
exit(res);
}

printf("创建线程成功\n 等待线程结束...\n");

while (1) {
res = sem_wait(&getok); //等待信号量
res = pthread_create(&thrd_writecom, NULL, thrd_wcom, (void *)test); //创建写串口子线程
}

//等待回收读串口线程
res = pthread_join(thrd_readcom, &thrd_ret);
if (!res) {
printf("读串口子线程结束\n");
} else {
printf("读串口子线程结束失败\n");
}

//等待回收写串口线程
res = pthread_join(thrd_writecom, &thrd_ret);
if (!res) {
printf("写串口子线程结束\n");
} else {
printf("写串口子线程结束失败\n");
}

//释放互斥锁
pthread_mutex_destroy(&mutex);

相关问题

这段代码是什么意思 cmeq_link_t* get_link_from_pool() { cmeq_link_t *plink = NULL; pthread_mutex_lock(&link_pool.lock_idle); while (list_empty(&link_pool.idle_head)) { pthread_mutex_unlock(&link_pool.lock_idle); sem_wait(&link_pool.wait_idle_link); pthread_mutex_lock(&link_pool.lock_idle); } plink = list_first_entry(&link_pool.idle_head, cmeq_link_t, user); list_del_init(&(plink->user)); pthread_mutex_unlock(&link_pool.lock_idle); // plink->testFlg = 1; //printf("get cmeq link %d\n", ++link_cnt); return plink; }

这段代码是一个函数，函数名为get_link_from_pool，返回值为cmeq_link_t类型的指针。这个函数的作用是从连接池中获取一个空闲的连接，并返回该连接的指针。

在函数中，首先定义了一个空指针plink，然后通过pthread_mutex_lock函数锁定了连接池的空闲连接列表。接下来使用while循环，在连接池的空闲连接列表为空的情况下，使用sem_wait函数等待连接池中有空闲连接可用。当获取到一个空闲连接时，使用list_first_entry函数获取该连接，并从空闲连接列表中删除该连接。最后通过pthread_mutex_unlock函数解锁连接池的空闲连接列表，并将获取到的连接指针返回。

注释中的plink->testFlg = 1和printf语句是注释掉的代码，不会被执行。

翻译这段代码并在每一行后注释/* 初始化互斥锁 */ pthread_mutex_init(&mutex, NULL); /* 初始化信号量 */ sem_init( &getok , 0 , 1 ); /* 创建读串口子线程 */ res = pthread_create(&thrd_readcom, NULL, thrd_rcom, &no); if (res != 0) { printf("Create COM read thread failed\n"); exit(res); } printf("Create threads success\n Waiting for threads to finish...\n"); while(1){ res = sem_wait( &getok ); res = pthread_create( &thrd_writecom , NULL , thrd_wcom , (void *)test); } //等待回收读串口线程 res = pthread_join(thrd_readcom, &thrd_ret); if (!res) { printf("COM read Thread joined\n"); } else { printf("COM read Thread join failed\n"); } //等待回收写串口线程 res = pthread_join(thrd_writecom, &thrd_ret); if (!res) { printf("COM write Thread joined\n"); } else { printf("COM write Thread join failed\n"); } //释放互斥锁 pthread_mutex_destroy(&mutex);

/* 初始化互斥锁 */
pthread_mutex_init(&mutex, NULL);

/* 初始化信号量 */
sem_init(&getok, 0, 1);

/* 创建读串口子线程 */
res = pthread_create(&thrd_readcom, NULL, thrd_rcom, &no);
if (res != 0) {
printf("Create COM read thread failed\n");
exit(res);
}

printf("Create threads success\n Waiting for threads to finish...\n");

while (1) {
res = sem_wait(&getok); //等待信号量
res = pthread_create(&thrd_writecom, NULL, thrd_wcom, (void *)test); //创建写串口子线程
}

//等待回收读串口线程
res = pthread_join(thrd_readcom, &thrd_ret);
if (!res) {
printf("COM read Thread joined\n");
} else {
printf("COM read Thread join failed\n");
}

//等待回收写串口线程
res = pthread_join(thrd_writecom, &thrd_ret);
if (!res) {
printf("COM write Thread joined\n");
} else {
printf("COM write Thread join failed\n");
}

//释放互斥锁
pthread_mutex_destroy(&mutex);