/usr/include/Poco/Mutex_WIN32.h is in libpoco-dev 1.8.0.1-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Mutex_WIN32.h
//
// Library: Foundation
// Package: Threading
// Module:  Mutex
//
// Definition of the MutexImpl and FastMutexImpl classes for WIN32.
//
// Copyright (c) 2004-2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//
#ifndef Foundation_Mutex_WIN32_INCLUDED
#define Foundation_Mutex_WIN32_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Exception.h"
#include "Poco/UnWindows.h"
namespace Poco {
class Foundation_API MutexImpl
{
protected:
	MutexImpl();
	~MutexImpl();
	void lockImpl();
	bool tryLockImpl();
	bool tryLockImpl(long milliseconds);
	void unlockImpl();
	
private:
	CRITICAL_SECTION _cs;
};
typedef MutexImpl FastMutexImpl;
//
// inlines
//
inline void MutexImpl::lockImpl()
{
	try
	{
		EnterCriticalSection(&_cs);
	}
	catch (...)
	{
		throw SystemException("cannot lock mutex");
	}
}
inline bool MutexImpl::tryLockImpl()
{
	try
	{
		return TryEnterCriticalSection(&_cs) != 0;
	}
	catch (...)
	{
	}
	throw SystemException("cannot lock mutex");
}
inline void MutexImpl::unlockImpl()
{
	LeaveCriticalSection(&_cs);
}
} // namespace Poco
#endif // Foundation_Mutex_WIN32_INCLUDED
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