Initial add of PowerRename from SmartRename repo (#499)

* Initial add of PowerRename from SmartRename repo

src/modules/powerrename/lib/srwlock.h

@@ -0,0 +1,79 @@
+#pragma once
+#include "stdafx.h"
+
+// Wrapper around SRWLOCK
+class CSRWLock
+{
+public:
+    CSRWLock()
+    {
+        InitializeSRWLock(&m_lock);
+    }
+
+    _Acquires_shared_lock_(this->m_lock)
+    void LockShared()
+    {
+        AcquireSRWLockShared(&m_lock);
+    }
+
+    _Acquires_exclusive_lock_(this->m_lock)
+    void LockExclusive()
+    {
+        AcquireSRWLockExclusive(&m_lock);
+    }
+
+    _Releases_shared_lock_(this->m_lock)
+    void ReleaseShared()
+    {
+        ReleaseSRWLockShared(&m_lock);
+    }
+
+    _Releases_exclusive_lock_(this->m_lock)
+    void ReleaseExclusive()
+    {
+        ReleaseSRWLockExclusive(&m_lock);
+    }
+
+    virtual ~CSRWLock()
+    {
+    }
+
+private:
+    SRWLOCK m_lock;
+};
+
+// RAII over an SRWLock (write)
+class CSRWExclusiveAutoLock
+{
+public:
+    CSRWExclusiveAutoLock(CSRWLock *srwLock)
+    {
+        m_pSRWLock = srwLock;
+        srwLock->LockExclusive();
+    }
+
+    virtual ~CSRWExclusiveAutoLock()
+    {
+        m_pSRWLock->ReleaseExclusive();
+    }
+protected:
+    CSRWLock *m_pSRWLock;
+};
+
+// RAII over an SRWLock (read)
+class CSRWSharedAutoLock
+{
+public:
+    CSRWSharedAutoLock(CSRWLock *srwLock)
+    {
+        m_pSRWLock = srwLock;
+        srwLock->LockShared();
+    }
+
+    virtual ~CSRWSharedAutoLock()
+    {
+        m_pSRWLock->ReleaseShared();
+    }
+protected:
+    CSRWLock *m_pSRWLock;
+};