зеркало из https://github.com/mozilla/gecko-dev.git
84 строки
2.5 KiB
C++
84 строки
2.5 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 "CrossProcessSemaphore.h"
|
|
#include "nsDebug.h"
|
|
#include "nsISupportsImpl.h"
|
|
#include "ProtocolUtils.h"
|
|
|
|
using base::GetCurrentProcessHandle;
|
|
using base::ProcessHandle;
|
|
|
|
namespace mozilla {
|
|
|
|
/* static */
|
|
CrossProcessSemaphore* CrossProcessSemaphore::Create(const char*,
|
|
uint32_t aInitialValue) {
|
|
// 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.
|
|
HANDLE semaphore =
|
|
::CreateSemaphoreA(nullptr, aInitialValue, 0x7fffffff, nullptr);
|
|
if (!semaphore) {
|
|
return nullptr;
|
|
}
|
|
return new CrossProcessSemaphore(semaphore);
|
|
}
|
|
|
|
/* static */
|
|
CrossProcessSemaphore* CrossProcessSemaphore::Create(
|
|
CrossProcessSemaphoreHandle aHandle) {
|
|
DWORD flags;
|
|
if (!::GetHandleInformation(aHandle.get(), &flags)) {
|
|
return nullptr;
|
|
}
|
|
|
|
return new CrossProcessSemaphore(aHandle.release());
|
|
}
|
|
|
|
CrossProcessSemaphore::CrossProcessSemaphore(HANDLE aSemaphore)
|
|
: mSemaphore(aSemaphore) {
|
|
MOZ_COUNT_CTOR(CrossProcessSemaphore);
|
|
}
|
|
|
|
CrossProcessSemaphore::~CrossProcessSemaphore() {
|
|
MOZ_ASSERT(mSemaphore, "Improper construction of semaphore or double free.");
|
|
::CloseHandle(mSemaphore);
|
|
MOZ_COUNT_DTOR(CrossProcessSemaphore);
|
|
}
|
|
|
|
bool CrossProcessSemaphore::Wait(const Maybe<TimeDuration>& aWaitTime) {
|
|
MOZ_ASSERT(mSemaphore, "Improper construction of semaphore.");
|
|
HRESULT hr = ::WaitForSingleObject(
|
|
mSemaphore, aWaitTime.isSome() ? aWaitTime->ToMilliseconds() : INFINITE);
|
|
return hr == WAIT_OBJECT_0;
|
|
}
|
|
|
|
void CrossProcessSemaphore::Signal() {
|
|
MOZ_ASSERT(mSemaphore, "Improper construction of semaphore.");
|
|
::ReleaseSemaphore(mSemaphore, 1, nullptr);
|
|
}
|
|
|
|
CrossProcessSemaphoreHandle CrossProcessSemaphore::CloneHandle() {
|
|
HANDLE newHandle;
|
|
bool succeeded =
|
|
::DuplicateHandle(GetCurrentProcess(), mSemaphore, GetCurrentProcess(),
|
|
&newHandle, 0, false, DUPLICATE_SAME_ACCESS);
|
|
|
|
if (!succeeded) {
|
|
return nullptr;
|
|
}
|
|
|
|
return UniqueFileHandle(newHandle);
|
|
}
|
|
|
|
void CrossProcessSemaphore::CloseHandle() {}
|
|
|
|
} // namespace mozilla
|