PHP (pthreads) 多线程

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Mr. Neo Chan, 陈景峰(BG7NYT)

　　
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$Id: book.xml 642 2013-07-19 01:28:13Z netkiller $



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$Date: 2013-07-19 09:28:13 +0800 (Fri, 19 Jul 2013) $



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5.14. pthreads



编译PHP时需要加入 --enable-maintainer-zts 选项才能安装pthreads

# pecl install pthread

配置文件


cat > /srv/php-5.5.7/etc/conf.d/pthreads.ini <<EOF
extension=pthreads.so
EOF

$ php -m |grep pthreads
pthreads

3.14.1. Thread




<?php
class test extends Thread {
public $name   = '';
public $runing = false;
public function __construct($name) {
$this->name   = $name;
$this->runing = true;
}
public function run() {
$n = 0;
while ($this->runing) {
printf("name: %s %s\n",$this->name, $n);
$n++;
sleep(1);
}
}
}
$pool[] = new test('a');
$pool[] = new test('b');
$pool[] = new test('c');
foreach ($pool as $w) {
$w->start();
}

　　线程池实现方法


$pool = array();
while($member = $row->fetch(PDO::FETCH_ASSOC))
{
while ( true ){
if(count($pool) < 2000){ //定义线程池数量，小于线程池数量则开启新的线程直到小于2000为止
$pool[$id] = new Update($member);
$pool[$id]->start();
break;
}else{
foreach ( $pool as $name => $worker){
//如果线程已经运行结束，销毁线程，给新的任务使用
if(! $worker->isRunning()){
unset($pool[$name]);
}
}
}
}
}




3.14.2. Pool




<?php
class ExampleWork extends Stackable {
public function __construct($data) {
$this->local = $data;
}
public function run() {
//print_r($this->local);echo "\r\n";
echo '------------------- '. $this->local . " -----------------\r\n";
sleep(1);
}
}
class ExampleWorker extends Worker {
public function __construct($name) {
$this->name = $name;
$this->data = array();
}
public function run(){
$this->name = sprintf("(%lu)", $this->getThreadId());
}
}
/* Dead simple pthreads pool */
class Pool {
/* to hold worker threads */
public $workers;
/* to hold exit statuses */
public $status;
/* prepare $size workers */
public function __construct($size = 10) {
$this->size = $size;
}
/* submit Stackable to Worker */
public function submit(Stackable $stackable) {
if (count($this->workers)<$this->size) {
$id = count($this->workers);
$this->workers[$id] = new ExampleWorker(sprintf("Worker [%d]", $id));
$this->workers[$id]->start(PTHREADS_INHERIT_NONE);
if ($this->workers[$id]->stack($stackable)) {
return $stackable;
} else trigger_error(sprintf("failed to push Stackable onto %s", $this->workers[$id]->getName()), E_USER_WARNING);
}else{
for ($i=0;$i<count($this->workers);$i++){
if( ! $this->workers[$i]->isWorking()){
$this->workers[$i]->stack($stackable);
return $stackable;
}
}
}
return false;
}
public function status(){
for ($i=0;$i<count($this->workers);$i++){
printf("(%s:%s)\r\n",$i, $this->workers[$i]->isWorking());
}
printf("\r\n");
}
/* Shutdown the pool of threads cleanly, retaining exit status locally */
public function shutdown() {
foreach($this->workers as $worker) {
$this->status[$worker->getThreadId()]=$worker->shutdown();
}
}
}
/* Create a pool of ten threads */
$pool = new Pool(100);
/* Create and submit an array of Stackables */
$work = array();
for ($target = 0; $target < 1000; $target++){
$work[$target]=$pool->submit(new ExampleWork($target));
if($work[$target] == false){
$target--;
sleep(1);
continue;
}
for ($i=0;$i<count($work);$i++){
if($work[$i]->isRunning()){
printf("cell: %s, status: %s\r\n",$i, $work[$i]->isRunning());
}
}
printf("\r\n");
}
$pool->shutdown();