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 #include "chrome/common/multi_process_lock.h" 6 7 #include "base/logging.h" 8 #include "base/strings/utf_string_conversions.h" 9 #include "base/win/scoped_handle.h" 10 11 class MultiProcessLockWin : public MultiProcessLock { 12 public: 13 explicit MultiProcessLockWin(const std::string& name) : name_(name) { } 14 15 virtual ~MultiProcessLockWin() { 16 if (event_.Get() != NULL) { 17 Unlock(); 18 } 19 } 20 21 virtual bool TryLock() { 22 if (event_.Get() != NULL) { 23 DLOG(ERROR) << "MultiProcessLock is already locked - " << name_; 24 return true; 25 } 26 27 if (name_.length() >= MAX_PATH) { 28 LOG(ERROR) << "Socket name too long (" << name_.length() 29 << " >= " << MAX_PATH << ") - " << name_; 30 return false; 31 } 32 33 string16 wname = UTF8ToUTF16(name_); 34 event_.Set(CreateEvent(NULL, FALSE, FALSE, wname.c_str())); 35 if (event_.Get() && GetLastError() != ERROR_ALREADY_EXISTS) { 36 return true; 37 } else { 38 event_.Set(NULL); 39 return false; 40 } 41 } 42 43 virtual void Unlock() { 44 if (event_.Get() == NULL) { 45 DLOG(ERROR) << "Over-unlocked MultiProcessLock - " << name_; 46 return; 47 } 48 event_.Set(NULL); 49 } 50 51 private: 52 std::string name_; 53 base::win::ScopedHandle event_; 54 DISALLOW_COPY_AND_ASSIGN(MultiProcessLockWin); 55 }; 56 57 MultiProcessLock* MultiProcessLock::Create(const std::string &name) { 58 return new MultiProcessLockWin(name); 59 } 60
