diff --git a/src/Sync/ExtSyncMutex.php b/src/Sync/ExtSyncMutex.php
new file mode 100644
index 0000000..3cd986c
--- /dev/null
+++ b/src/Sync/ExtSyncMutex.php
@@ -0,0 +1,39 @@
+<?php
+namespace Icicle\Concurrent\Sync;
+
+use Icicle\Concurrent\Exception\MutexException;
+
+/**
+ * A wrapper for a mutex based on the "sync" extension.
+ */
+class ExtSyncMutex implements MutexInterface
+{
+    /**
+     * @var \SyncMutex A mutex instance.
+     */
+    private $mutex;
+
+    /**
+     * Creates a new mutex object.
+     */
+    public function __construct()
+    {
+        $this->mutex = new \SyncMutex();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function lock()
+    {
+        $this->mutex->lock(-1);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function unlock()
+    {
+        $this->mutex->unlock(false);
+    }
+}