зеркало из https://github.com/mozilla/gecko-dev.git
76 строки
1.9 KiB
C++
76 строки
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
* 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 "nsTraceRefcnt.h"
|
|
|
|
using namespace base;
|
|
|
|
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(NULL, FALSE, NULL);
|
|
if (!mMutex) {
|
|
NS_RUNTIMEABORT("This shouldn't happen - failed to create mutex!");
|
|
}
|
|
MOZ_COUNT_CTOR(CrossProcessMutex);
|
|
}
|
|
|
|
CrossProcessMutex::CrossProcessMutex(CrossProcessMutexHandle aHandle)
|
|
{
|
|
DWORD flags;
|
|
if (!::GetHandleInformation(aHandle, &flags)) {
|
|
NS_RUNTIMEABORT("Attempt to construct a mutex from an invalid handle!");
|
|
}
|
|
mMutex = aHandle;
|
|
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::ShareToProcess(ProcessHandle aHandle)
|
|
{
|
|
HANDLE newHandle;
|
|
bool succeeded = ::DuplicateHandle(GetCurrentProcessHandle(),
|
|
mMutex, aHandle, &newHandle,
|
|
NULL, FALSE, DUPLICATE_SAME_ACCESS);
|
|
|
|
if (!succeeded) {
|
|
return NULL;
|
|
}
|
|
|
|
return newHandle;
|
|
}
|
|
|
|
}
|