forked from mirrors/gecko-dev
265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
69 lines
2 KiB
C++
69 lines
2 KiB
C++
/* -*- 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, &flags)) {
|
|
MOZ_CRASH("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(
|
|
base::ProcessId aTargetPid) {
|
|
HANDLE newHandle;
|
|
bool succeeded = ipc::DuplicateHandle(mMutex, aTargetPid, &newHandle, 0,
|
|
DUPLICATE_SAME_ACCESS);
|
|
|
|
if (!succeeded) {
|
|
return nullptr;
|
|
}
|
|
|
|
return newHandle;
|
|
}
|
|
|
|
} // namespace mozilla
|