зеркало из https://github.com/mozilla/gecko-dev.git
107 строки
3.4 KiB
C++
107 строки
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Bas Schouten <bschouten@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <windows.h>
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#include "base/process_util.h"
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#include "CrossProcessMutex.h"
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#include "nsDebug.h"
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#include "nsTraceRefcnt.h"
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using namespace base;
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namespace mozilla {
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CrossProcessMutex::CrossProcessMutex(const char*)
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{
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// We explicitly share this using DuplicateHandle, we do -not- want this to
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// be inherited by child processes by default! So no security attributes are
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// given.
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mMutex = ::CreateMutexA(NULL, FALSE, NULL);
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if (!mMutex) {
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NS_RUNTIMEABORT("This shouldn't happen - failed to create mutex!");
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}
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MOZ_COUNT_CTOR(CrossProcessMutex);
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}
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CrossProcessMutex::CrossProcessMutex(CrossProcessMutexHandle aHandle)
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{
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DWORD flags;
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if (!::GetHandleInformation(aHandle, &flags)) {
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NS_RUNTIMEABORT("Attempt to construct a mutex from an invalid handle!");
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}
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mMutex = aHandle;
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}
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CrossProcessMutex::~CrossProcessMutex()
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{
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NS_ASSERTION(mMutex, "Improper construction of mutex or double free.");
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::CloseHandle(mMutex);
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MOZ_COUNT_DTOR(CrossProcessMutex);
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}
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void
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CrossProcessMutex::Lock()
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{
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NS_ASSERTION(mMutex, "Improper construction of mutex.");
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::WaitForSingleObject(mMutex, INFINITE);
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}
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void
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CrossProcessMutex::Unlock()
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{
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NS_ASSERTION(mMutex, "Improper construction of mutex.");
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::ReleaseMutex(mMutex);
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}
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CrossProcessMutexHandle
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CrossProcessMutex::ShareToProcess(ProcessHandle aHandle)
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{
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HANDLE newHandle;
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bool succeeded = ::DuplicateHandle(GetCurrentProcessHandle(),
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mMutex, aHandle, &newHandle,
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NULL, FALSE, DUPLICATE_SAME_ACCESS);
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if (!succeeded) {
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return NULL;
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}
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return newHandle;
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}
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}
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