翻译一下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);

这段代码使用了线程和信号量来实现串口读写的功能。具体来说，代码中的 `pthread_mutex_init` 函数用于初始化一个互斥锁，`sem_init` 函数用于初始化一个信号量。然后通过 `pthread_create` 函数创建一个读串口的线程 `thrd_readcom`，并在创建过程中检查是否创建成功。接着进入一个循环，等待信号量 `getok` 的值变为 1，然后创建一个写串口的线程 `thrd_writecom`。在程序运行结束时，使用 `pthread_join` 函数回收线程资源。最后，使用 `pthread_mutex_destroy` 函数释放互斥锁的资源。

相关问题

pthread_mutex_init(&peer_mutex_lock, NULL);

引用中的代码说明了pthread_mutex_init函数的使用。在代码中，pthread_mutex_init(&g_mutex, NULL)是用来初始化一个互斥锁的函数调用。互斥锁用于在线程间提供互斥访问共享资源的机制。这个函数的第一个参数是指向互斥锁对象的指针，第二个参数是一个指向pthread_mutexattr_t结构体的指针，用于设置互斥锁的属性。在这个例子中，传入的是NULL，表示使用默认的属性。在函数调用之后，互斥锁对象会被初始化为一个未锁定的状态，可以在后续的代码中使用pthread_mutex_lock函数来加锁互斥锁，使用pthread_mutex_unlock函数来释放互斥锁。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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pthread_mutex_init(&main_wait, NULL);什么意识

pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)

The pthread_mutex_init() function initializes a mutex object specified by the mutex parameter. The attr parameter can be used to specify additional attributes for the mutex object, such as whether it is a recursive mutex or a shared mutex.

The function returns zero on success and a non-zero error code on failure. Once a mutex object has been initialized, it can be used to synchronize access to shared resources between multiple threads.

Note: This function is part of the POSIX threads (pthread) library, which is a standard for thread programming in Unix-like operating systems.