15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2011 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "chrome/common/multi_process_lock.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 8868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "base/strings/utf_string_conversions.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/win/scoped_handle.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class MultiProcessLockWin : public MultiProcessLock { 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) explicit MultiProcessLockWin(const std::string& name) : name_(name) { } 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~MultiProcessLockWin() { 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (event_.Get() != NULL) { 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Unlock(); 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual bool TryLock() { 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (event_.Get() != NULL) { 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DLOG(ERROR) << "MultiProcessLock is already locked - " << name_; 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (name_.length() >= MAX_PATH) { 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LOG(ERROR) << "Socket name too long (" << name_.length() 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << " >= " << MAX_PATH << ") - " << name_; 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) base::string16 wname = base::UTF8ToUTF16(name_); 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) event_.Set(CreateEvent(NULL, FALSE, FALSE, wname.c_str())); 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (event_.Get() && GetLastError() != ERROR_ALREADY_EXISTS) { 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) event_.Set(NULL); 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void Unlock() { 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (event_.Get() == NULL) { 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DLOG(ERROR) << "Over-unlocked MultiProcessLock - " << name_; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) event_.Set(NULL); 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string name_; 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::win::ScopedHandle event_; 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(MultiProcessLockWin); 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)MultiProcessLock* MultiProcessLock::Create(const std::string &name) { 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return new MultiProcessLockWin(name); 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 60