php使用多進程(pcntl)
阿新 • • 發佈:2018-06-02
php使用多進程(pcntl)
<?php
/**
* this is a demo for php fork and pipe usage. fork use
* to create child process and pipe is used to sychoroize
* the child process and its main process.
* @author bourneli
* @date: 2012-7-6
*/
define("PC", 10); // 進程個數
define("TO", 4); // 超時
if (!function_exists(‘pcntl_fork‘)) {
die("pcntl_fork not existing");
}
// 創建管道
$sPipePath = "my_pipe.".posix_getpid();
if (!posix_mkfifo($sPipePath, 0666)) {
die("create pipe {$sPipePath} error");
}
// 模擬任務並發
for ($i = 0; $i < PC; ++$i ) {
$nPID = pcntl_fork(); // 創建子進程
if ($nPID == 0) {
// 子進程過程
for($j=0;$j<99999;$j++){
touch("test/{$i}{$j}.txt");
}
$oW = fopen($sPipePath, ‘w‘);
fwrite($oW, $i."\n"); // 當前任務處理完比,在管道中寫入數據
fclose($oW);
exit(0); // 執行完後退出
}
}
// 父進程
$oR = fopen($sPipePath, ‘r‘);
stream_set_blocking($oR, FALSE); // 將管道設置為非堵塞,用於適應超時機制
$sData = ‘‘; // 存放管道中的數據
$nLine = 0;
$nStart = time();
while ($nLine < PC && (time() - $nStart) < TO) {
$sLine = fread($oR, 1024);
if (empty($sLine)) {
continue;
}
echo "current line: {$sLine}\n";
// 用於分析多少任務處理完畢,通過‘\n’標識
foreach(str_split($sLine) as $c) {
if ("\n" == $c) {
++$nLine;
}
}
$sData .= $sLine;
}
echo "Final line count:$nLine\n";
fclose($oR);
unlink($sPipePath); // 刪除管道,已經沒有作用了
// 等待子進程執行完畢,避免僵屍進程
$n = 0;
while ($n < PC) {
$nStatus = -1;
$nPID = pcntl_wait($nStatus, WNOHANG);
if ($nPID > 0) {
echo "{$nPID} exit\n";
++$n;
}
}
// 驗證結果,主要查看結果中是否每個任務都完成了
$arr2 = array();
foreach(explode("\n", $sData) as $i) {// trim all
if (is_numeric(trim($i))) {
array_push($arr2, $i);
}
}
$arr2 = array_unique($arr2);
if ( count($arr2) == PC) {
echo ‘ok‘;
} else {
echo "error count " . count($arr2) . "\n";
var_dump($arr2);
}
php使用多進程(pcntl)