php 多进程中的信号问题
1.以下代码sleep时间远小于20
<?php // 当子进程退出时，会触发该函数function sig_handler($sig) {switch($sig) {case SIGCHLD:echo 'SIGCHLD received'."n";}} pcntl_signal(SIGCHLD, SIG_IGN );// 注册子进程退出时调用的函数$start = time(); $sub_process_cnt = 20;for($i=0;$i<$sub_process_cnt;$i++) { sleep(1); $pid = pcntl_fork(); if ($pid == 0) {exit(-1);}}$status = 0; for ($k=0; $k<$sub_process_cnt; $k++) {pcntl_waitpid(-1, $status );}$end = time();$usage = $end - $start;print "End, use: ".$usage." seconds" ; ?>