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77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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 "nsISupportsImpl.h"
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using base::GetCurrentProcessHandle;
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using base::ProcessHandle;
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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(nullptr, FALSE, nullptr);
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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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MOZ_COUNT_CTOR(CrossProcessMutex);
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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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0, FALSE, DUPLICATE_SAME_ACCESS);
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if (!succeeded) {
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return nullptr;
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}
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return newHandle;
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}
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}
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