/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include <windows.h> #include "base/process_util.h" #include "CrossProcessMutex.h" #include "nsDebug.h" #include "nsISupportsImpl.h" #include "ProtocolUtils.h" using base::GetCurrentProcessHandle; using base::ProcessHandle; namespace mozilla { CrossProcessMutex::CrossProcessMutex(const char*) { // We explicitly share this using DuplicateHandle, we do -not- want this to // be inherited by child processes by default! So no security attributes are // given. mMutex = ::CreateMutexA(nullptr, FALSE, nullptr); if (!mMutex) { MOZ_CRASH("This shouldn't happen - failed to create mutex!"); } MOZ_COUNT_CTOR(CrossProcessMutex); } CrossProcessMutex::CrossProcessMutex(CrossProcessMutexHandle aHandle) { DWORD flags; if (!::GetHandleInformation(aHandle.get(), &flags)) { MOZ_CRASH("Attempt to construct a mutex from an invalid handle!"); } mMutex = aHandle.release(); MOZ_COUNT_CTOR(CrossProcessMutex); } CrossProcessMutex::~CrossProcessMutex() { NS_ASSERTION(mMutex, "Improper construction of mutex or double free."); ::CloseHandle(mMutex); MOZ_COUNT_DTOR(CrossProcessMutex); } void CrossProcessMutex::Lock() { NS_ASSERTION(mMutex, "Improper construction of mutex."); ::WaitForSingleObject(mMutex, INFINITE); } void CrossProcessMutex::Unlock() { NS_ASSERTION(mMutex, "Improper construction of mutex."); ::ReleaseMutex(mMutex); } CrossProcessMutexHandle CrossProcessMutex::CloneHandle() { HANDLE newHandle; if (!::DuplicateHandle(GetCurrentProcess(), mMutex, GetCurrentProcess(), &newHandle, 0, false, DUPLICATE_SAME_ACCESS)) { return nullptr; } return mozilla::UniqueFileHandle(newHandle); } } // namespace mozilla