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vendor/yiisoft/yii2/mutex/RetryAcquireTrait.php

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+<?php
+/**
+ * @link https://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license https://www.yiiframework.com/license/
+ */
+
+namespace yii\mutex;
+
+use Closure;
+
+/**
+ * Trait RetryAcquireTrait.
+ *
+ * @author Robert Korulczyk <robert@korulczyk.pl>
+ * @internal
+ * @since 2.0.16
+ */
+trait RetryAcquireTrait
+{
+    /**
+     * @var int Number of milliseconds between each try in [[acquire()]] until specified timeout times out.
+     * By default it is 50 milliseconds - it means that [[acquire()]] may try acquire lock up to 20 times per second.
+     * @since 2.0.16
+     */
+    public $retryDelay = 50;
+
+
+    private function retryAcquire($timeout, Closure $callback)
+    {
+        $start = microtime(true);
+        do {
+            if ($callback()) {
+                return true;
+            }
+            usleep($this->retryDelay * 1000);
+        } while (microtime(true) - $start < $timeout);
+
+        return false;
+    }
+}