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                # swoole_process->start 執行fork系統調用,啟動進程。 ```php function swoole_process->start() : int ``` 創建成功返回子進程的`PID`,創建失敗返回`false`。可使用`swoole_errno`和`swoole_strerror`得到錯誤碼和錯誤信息。 * `$process->pid` 屬性為子進程的`PID` * `$process->pipe` 屬性為管道的文件描述符 * 子進程會繼承父進程的內存和文件句柄 * 子進程在啟動時會清除從父進程繼承的`EventLoop`、`Signal`、`Timer` > 執行后子進程會保持父進程的內存和資源,如父進程內創建了一個redis連接,那么在子進程會保留此對象,所有操作都是對同一個連接進行的。 實例 ----- ```php $redis = new $redis; $redis->connect('127.0.0.1', 6379); function callback_function () { swoole_timer_after(10000, function () { echo "hello world"; }); global $redis; }; swoole_timer_tick(1000, function () { echo "parent timer\n"; }); swoole_process::signal(SIGCHLD, function ($sig) { while ($ret = Swoole\Process::wait(false)) { // create a new child process $p = new Swoole\Process('callback_function'); $p->start(); } }); // create a new child process $p = new Swoole\Process('callback_function'); swoole_event_add($p->pipe, function ($pipe) use ($p) { echo $p->read(); }); $p->start(); ``` * 子進程啟動后會自動清除父進程中`swoole_timer_tick`創建的定時器、`swoole_process::signal`監聽的信號和`swoole_event_add`添加的事件監聽 * 子進程會繼承父進程創建的`$redis`連接對象,父子進程使用的連接是同一個
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