diff --git a/composer.json b/composer.json
index 8c0b2ce..3dda89a 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,9 @@
     }
   ],
   "require": {
-    "php": ">=7.1"
+    "php": "^7.1",
+    "ext-posix": "^7.1",
+    "ext-pcntl": "^7.1"
   },
   "require-dev": {
     "phpunit/phpunit": "^6.0"
@@ -36,4 +38,4 @@
       "WebSockets\\Tests\\": "tests/"
     }
   }
-}
\ No newline at end of file
+}
diff --git a/src/Handler.php b/src/Handler.php
index 488690e..da54c45 100644
--- a/src/Handler.php
+++ b/src/Handler.php
@@ -8,6 +8,8 @@
  */
 abstract class Handler
 {
+    protected $dispatcher;
+    protected $locker = 'semaphore.lock';
     protected $server;
     protected $master;
     protected $pid = 0;
@@ -21,6 +23,7 @@ abstract class Handler
      */
     public function __construct($server, $master)
     {
+        $this->dispatcher = new Dispatcher();
         $this->server = $server;
         $this->master = $master;
         $this->pid = posix_getpid();
@@ -62,6 +65,7 @@ private function handshake($socket): Generator
 
         foreach ($lines as $line) {
             $line = rtrim($line);
+
             if (preg_match('/\A(\S+): (.*)\z/', $line, $matches)) {
                 $headers[$matches[1]] = $matches[2];
             }
@@ -73,7 +77,6 @@ private function handshake($socket): Generator
 
         $secKey = $headers['Sec-WebSocket-Key'];
         $secAccept = base64_encode(pack('H*', sha1($secKey . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
-
         $response = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
             "Upgrade: websocket\r\n" .
             "Connection: Upgrade\r\n" .
@@ -96,16 +99,15 @@ private function handshake($socket): Generator
     protected function read($client): Generator
     {
         yield Dispatcher::listenRead($client);
-
         $data = Frame::decode($client);
 
         switch ($data['opcode']) {
             case Frame::CLOSE:
                 Logger::log('worker', $this->pid, 'close', (int)$client);
-                yield Dispatcher::async($this->onClose((int)$client));
-                yield Dispatcher::listenRemove((int)$client);
+                $this->dispatcher->removeClient((int)$client);
                 unset($this->clients[(int)$client]);
                 fclose($client);
+                yield Dispatcher::async($this->onClose((int)$client));
                 break;
             case Frame::PING:
                 Logger::log('worker', $this->pid, 'ping', (int)$client);
@@ -150,9 +152,21 @@ protected function listerMaster(): Generator
             Logger::log('worker', $this->pid, 'received text from master:', $data['payload']);
             yield Dispatcher::async($this->onMasterMessage($data['payload']));
         }
+
         yield Dispatcher::async($this->listerMaster());
     }
 
+    /**
+     * @return Generator
+     */
+    protected function acceptSocket(): Generator
+    {
+        if ($client = @stream_socket_accept($this->server, 0, $peerName)) {
+            Logger::log('worker', $this->pid, 'socket accepted');
+            yield Dispatcher::async($this->handshake($client));
+        }
+    }
+
     /**
      * Main socket listener
      *
@@ -161,12 +175,14 @@ protected function listerMaster(): Generator
     protected function listenSocket(): Generator
     {
         yield Dispatcher::listenRead($this->server);
+        $handle = fopen($this->locker, 'a');
 
-        if ($client = @stream_socket_accept($this->server)) {
-            Logger::log('worker', $this->pid, 'socket accepted');
-            yield Dispatcher::async($this->handshake($client));
+        if ($handle && flock($handle, LOCK_EX)) {
+            yield Dispatcher::async($this->acceptSocket());
+            flock($handle, LOCK_UN);
         }
 
+        fclose($handle);
         yield Dispatcher::async($this->listenSocket());
     }
 
@@ -199,7 +215,6 @@ private function afterHandshake(array $headers, $socket): Generator
         } else {
             Logger::log('worker', $this->pid, 'connection accepted for', (int)$socket);
             $this->clients[(int)$socket] = $socket;
-
             yield Dispatcher::async($this->onConnect($socket));
             yield Dispatcher::async($this->read($socket));
         }
@@ -251,7 +266,7 @@ protected function onMasterMessage(string $message): Generator
      */
     final public function handle(): void
     {
-        (new Dispatcher())
+        $this->dispatcher
             ->add($this->listerMaster())
             ->add($this->listenSocket())
             ->dispatch();