1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_COMMON_MULTI_PROCESS_LOCK_H_ 6 #define CHROME_COMMON_MULTI_PROCESS_LOCK_H_ 7 8 #include <sys/types.h> 9 #include <string> 10 11 // Platform abstraction for a lock that can be shared between processes. 12 // The process that owns the lock will release it on exit even if 13 // the exit is due to a crash. Locks are not recursive. 14 class MultiProcessLock { 15 public: 16 17 // Factory method for creating a multi-process lock. 18 // |name| is the name of the lock. The name has special meaning on Windows 19 // where the prefix can determine the namespace of the lock. 20 // See http://msdn.microsoft.com/en-us/library/aa382954(v=VS.85).aspx for 21 // details. 22 static MultiProcessLock* Create(const std::string& name); 23 ~MultiProcessLock()24 virtual ~MultiProcessLock() { } 25 26 // Try to grab ownership of the lock. 27 virtual bool TryLock() = 0; 28 29 // Release ownership of the lock. 30 virtual void Unlock() = 0; 31 }; 32 33 #endif // CHROME_COMMON_MULTI_PROCESS_LOCK_H_ 34