php pthreads多线程的安装与使用

mutex = $mutex; $this->handle = fopen("/tmp/counter.txt","w+"); } public function __destruct(){ fclose($this->handle); } public function run() { if($this->mutex) $locked=Mutex::lock($this->mutex); $counter = intval(fgets($this->handle)); $counter++; rewind($this->handle); fputs($this->handle,$counter ); printf("Thread #%lu says: %sn",$this->getThreadId(),$counter); if($this->mutex) Mutex::unlock($this->mutex); } } //没有互斥锁 for ($i=0;$i<50;$i++){ $threads[$i] = new CounterThread(); $threads[$i]->start(); } //加入互斥锁 $mutex = Mutex::create(true); for ($i=0;$i<50;$i++){ $threads[$i] = new CounterThread($mutex); $threads[$i]->start(); } Mutex::unlock($mutex); for ($i=0;$i<50;$i++){ $threads[$i]->join(); } Mutex::destroy($mutex); ?>

多线程与共享内存

在共享内存的例子中，没有使用任何锁，仍然可能正常工作，可能工作内存操作本身具备锁的功能

shmid = $shmid; } public function run() { $counter = shm_get_var( $this->shmid,1 ); $counter++; shm_put_var( $this->shmid,$counter); } } for ($i=0;$i<100;$i++){ $threads[] = new CounterThread($shmid); } for ($i=0;$i<100;$i++){ $threads[$i]->start(); } for ($i=0;$i<100;$i++){ $threads[$i]->join(); } shm_remove( $shmid ); shm_detach( $shmid ); ?>

有些场景我们不希望 thread->start() 就开始运行程序，而是希望线程等待我们的命令。thread−>wait();测作用是thread−>start()后线程并不会立即运行，只有收到 thread->notify(); 发出的信号后才运行

shmid = $shmid; } public function run() { $this->synchronized(function($thread){ $thread->wait(); },$this); $counter = shm_get_var( $this->shmid,$counter); } } for ($i=0;$i<100;$i++){ $threads[] = new CounterThread($shmid); } for ($i=0;$i<100;$i++){ $threads[$i]->start(); } for ($i=0;$i<100;$i++){ $threads[$i]->synchronized(function($thread){ $thread->notify(); },$threads[$i]); } for ($i=0;$i<100;$i++){ $threads[$i]->join(); } shm_remove( $shmid ); shm_detach( $shmid ); ?>

一个Pool类

row = $row; $this->sql = null; } public function run() { if(strlen($this->row['bankno']) > 100 ){ $bankno = safenet_decrypt($this->row['bankno']); }else{ $error = sprintf("%s,%srn",$this->row['id'],$this->row['bankno']); file_put_contents("bankno_error.log",$error,FILE_APPEND); } if( strlen($bankno) > 7 ){ $sql = sprintf("update members set bankno = '%s' where id = '%s';",$bankno,$this->row['id']); $this->sql = $sql; } printf("%sn",$this->sql); } } class Pool { public $pool = array(); public function __construct($count) { $this->count = $count; } public function push($row){ if(count($this->pool) < $this->count){ $this->pool[] = new Update($row); return true; }else{ return false; } } public function start(){ foreach ( $this->pool as $id => $worker){ $this->pool[$id]->start(); } } public function join(){ foreach ( $this->pool as $id => $worker){ $this->pool[$id]->join(); } } public function clean(){ foreach ( $this->pool as $id => $worker){ if(! $worker->isRunning()){ unset($this->pool[$id]); } } } } try { $dbh = new PDO("mysql:host=" . str_replace(':',';port=',$dbhost) . ";dbname=$dbname",$dbuser,$dbpw,array( PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES 'UTF8'',PDO::MYSQL_ATTR_COMPRESS => true ) ); $sql = "select id,bankno from members order by id desc"; $row = $dbh->query($sql); $pool = new Pool(5); while($member = $row->fetch(PDO::FETCH_ASSOC)) { while(true){ if($pool->push($member)){ //压入任务到池中 break; }else{ //如果池已经满，就开始启动线程 $pool->start(); $pool->join(); $pool->clean(); } } } $pool->start(); $pool->join(); $dbh = null; } catch (Exception $e) { echo '[',date('H:i:s'),']','系统错误',$e->getMessage(),"n"; } ?>

动态队列线程池

上面的例子是当线程池满后执行start统一启动，下面的例子是只要线程池中有空闲便立即创建新线程。

row = $row; $this->sql = null; //print_r($this->row); } public function run() { if(strlen($this->row['bankno']) > 100 ){ $bankno = safenet_decrypt($this->row['bankno']); }else{ $error = sprintf("%s,$this->sql); } } try { $dbh = new PDO("mysql:host=" . str_replace(':',bankno from members order by id desc limit 50"; $row = $dbh->query($sql); $pool = array(); while($member = $row->fetch(PDO::FETCH_ASSOC)) { $id = $member['id']; while (true){ if(count($pool) < 5){ $pool[$id] = new Update($member); $pool[$id]->start(); break; }else{ foreach ( $pool as $name => $worker){ if(! $worker->isRunning()){ unset($pool[$name]); } } } } } $dbh = null; } catch (Exception $e) { echo '【','】','【系统错误】',"n"; } ?>

pthreads Pool类

logger = $logger; } protected $loger; } class WebWork extends Stackable { public function isComplete() { return $this->complete; } public function run() { $this->worker ->logger ->log("%s executing in Thread #%lu",__CLASS__,$this->worker->getThreadId()); $this->complete = true; } protected $complete; } class SafeLog extends Stackable { protected function log($message,$args = []) { $args = func_get_args(); if (($message = array_shift($args))) { echo vsprintf( "{$message}n",$args); } } } $pool = new Pool(8,WebWorker::class,[new SafeLog()]); $pool->submit($w=new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->submit(new WebWork()); $pool->shutdown(); $pool->collect(function($work){ return $work->isComplete(); }); var_dump($pool);

LOCK_SH 取得共享锁定（读取的程序）

LOCK_EX 取得独占锁定（写入的程序

LOCK_UN 释放锁定（无论共享或独占）

LOCK_NB 如果不希望 flock() 在锁定时堵塞