## Process->push 投递数据到消息队列中。 ~~~ bool Process->push(string $data); ~~~ * $data要投递的数据，长度受限与操作系统内核参数的限制。默认为8192，最大不超过65536 * 操作失败会返回false，成功返回true * 默认模式下（阻塞模式），如果队列已满，`push`方法会阻塞等待 * 非阻塞模式下，如果队列已满，`push`方法会立即返回false 示例 ~~~ $workers = []; $worker_num = 2; for($i = 0; $i < $worker_num; $i++) { $process = new swoole_process('callback_function', false, false); $process->useQueue(); $pid = $process->start(); $workers[$pid] = $process; //echo "Master: new worker, PID=".$pid."\n"; } function callback_function(swoole_process $worker) { //echo "Worker: start. PID=".$worker->pid."\n"; //recv data from master $recv = $worker->pop(); echo "From Master: $recv\n"; sleep(2); $worker->exit(0); } foreach($workers as $pid => $process) { $process->push("hello worker[$pid]\n"); } for($i = 0; $i < $worker_num; $i++) { $ret = swoole_process::wait(); $pid = $ret['pid']; unset($workers[$pid]); echo "Worker Exit, PID=".$pid.PHP_EOL; } ~~~