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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_COMMON_MULTI_PROCESS_LOCK_H_
#define CHROME_COMMON_MULTI_PROCESS_LOCK_H_
#pragma once
#include <sys/types.h>
#include <string>
// Platform abstraction for a lock that can be shared between processes.
// The process that owns the lock will release it on exit even if
// the exit is due to a crash. Locks are not recursive.
class MultiProcessLock {
public:
// The length of a multi-process lock name is limited on Linux, so
// it is limited it on all platforms for consistency. This length does
// not include a terminator.
static const size_t MULTI_PROCESS_LOCK_NAME_MAX_LEN = 106;
// Factory method for creating a multi-process lock.
// |name| is the name of the lock. The name has special meaning on Windows
// where the prefix can determine the namespace of the lock.
// See http://msdn.microsoft.com/en-us/library/aa382954(v=VS.85).aspx for
// details.
static MultiProcessLock* Create(const std::string& name);
virtual ~MultiProcessLock() { }
// Try to grab ownership of the lock.
virtual bool TryLock() = 0;
// Release ownership of the lock.
virtual void Unlock() = 0;
};
#endif // CHROME_COMMON_MULTI_PROCESS_LOCK_H_
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