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                # swoole_process::wait 回收結束運行的子進程。 ```php array swoole_process::wait(bool $blocking = true); $result = array('code' => 0, 'pid' => 15001, 'signal' => 15); ``` * $blocking 參數可以指定是否阻塞等待,默認為阻塞 * 操作成功會返回一個數組包含子進程的PID、退出狀態碼、被哪種信號KILL * 失敗返回false > 子進程結束必須要執行wait進行回收,否則子進程會變成僵尸進程 > $blocking 僅在1.7.10以上版本可用 >使用swoole_process作為監控父進程,創建管理子process時,父類必須注冊信號SIGCHLD對退出的進程執行wait,否則子process一旦被kill會引起父process exit 在異步信號回調中執行wait ----- ```php swoole_process::signal(SIGCHLD, function($sig) { //必須為false,非阻塞模式 while($ret = swoole_process::wait(false)) { echo "PID={$ret['pid']}\n"; } }); ``` * 信號發生時可能同時有多個子進程退出 * 必須循環執行wait直到返回false
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