// Copyright 2005-2016 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.

#ifndef MUMBLE_MUMBLE_LOCKFILE_H_
#define MUMBLE_MUMBLE_LOCKFILE_H_

#if defined(Q_OS_WIN)
# include <windows.h>
#endif

/// UserLockFile implements an atomic lock file
/// that can be used as a mutex between different
/// processes run by the same user.
class UserLockFile {
#if defined(Q_OS_WIN)
	HANDLE m_handle;
#endif
	QString m_path;

	public:
		/// Constructs a LockFile at path.
		/// The path should be somewhere
		/// owned by the current user, such
		/// as inside the home directory of
		/// the user. This is to avoid clashing
		/// with other lock files.
		UserLockFile(const QString &path);

		/// Destroys the LockFile, and ensures
		/// that it is released.
		~UserLockFile();

		/// Returns the path that the lock file
		/// exists at.
		QString path() const;

		/// Acquires the lock file.
		bool acquire();

		/// Releases the lock file.
		void release();
};

#endif
