Inter-process communication implementation method in Workerman document

Workerman is a powerful PHP development framework that supports high-concurrency network communication and is very useful for building applications with high real-time requirements. In Workerman's documentation, there is a very important function implementation method-inter-process communication.

Inter-process communication (IPC) is a very important mechanism in the operating system, which allows the exchange and sharing of data between different processes. In Workerman, the implementation of inter-process communication functions can be accomplished by using shared memory and semaphores.

First of all, we need to understand the basic principles of inter-process communication. In the operating system, each process has its own independent memory space, but through shared memory, different processes can share a certain memory area to realize data exchange and sharing.

In Workerman, you can use the Worker::$shmCache attribute to implement the shared memory function. $shmCache is an array that can be used to store data shared between multiple processes. The following is a simple code example:

use WorkermanWorker;

// 创建一个Worker对象
$worker = new Worker();

// 初始化一个共享内存区域，大小为1024
$worker->shmCache = new WorkerShmCache(1024);

// 设置进程启动时的回调函数
$worker->onWorkerStart = function() {
    global $worker;

    // 启动时，将数据写入共享内存区域
    $worker->shmCache->put('key', 'value');
};

// 设置进程收到消息时的回调函数
$worker->onMessage = function($connection, $data) {
    global $worker;

    // 收到消息时，读取共享内存区域的数据
    $value = $worker->shmCache->get('key');

    // 将数据发送给客户端
    $connection->send($value);
};

// 启动Worker对象
Worker::runAll();

In the above code, we write data to the shared memory area through the $worker->shmCache->put() method, and Read the data in the shared memory area through the $worker->shmCache->get() method. In this way, different processes can exchange and share data through shared memory.

In addition to shared memory, semaphores are also a commonly used inter-process communication mechanism. In Workerman, you can use the Worker::$sem attribute to implement the semaphore function. $sem is an integer variable used to represent the value of the semaphore. The following is a simple example:

use WorkermanWorker;

// 创建一个Worker对象
$worker = new Worker();

// 初始化一个信号量
$worker->sem = 0;

// 设置进程启动时的回调函数
$worker->onWorkerStart = function() {
    global $worker;

    // 启动时，增加信号量的值
    $worker->sem++;
};

// 设置进程收到消息时的回调函数
$worker->onMessage = function($connection, $data) {
    global $worker;

    // 收到消息时，减少信号量的值
    $worker->sem--;

    // 将信号量的值发送给客户端
    $connection->send($worker->sem);
};

// 启动Worker对象
Worker::runAll();

In the above code, we represent the value of the semaphore through the $worker->sem variable, and pass the $worker-> sem and $worker->sem-- operate to increase and decrease the value of the semaphore. In this way, different processes can achieve synchronization and mutual exclusion functions through semaphores.

In this article, we introduce the implementation method of inter-process communication through Workerman's documentation. By sharing memory and semaphores, different processes can easily exchange and share data. If you want to know more details about Workerman's inter-process communication, please refer to the official documentation.

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