83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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 "nsUpdateMutex.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/ScopeExit.h"
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#include "mozilla/StaticMutex.h"
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#include "nsIFile.h"
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#include "nsProfileLock.h"
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#include "nsXULAppAPI.h"
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mozilla::StaticMutex UpdateMutexImpl::sInProcessMutex;
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bool UpdateMutexImpl::TryLock() {
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if (!sInProcessMutex.TryLock()) {
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return false;
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}
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bool success = [&crossProcessLock = mCrossProcessLock]() {
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nsCOMPtr<nsIFile> updRoot;
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nsresult nsrv =
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NS_GetSpecialDirectory(XRE_UPDATE_ROOT_DIR, getter_AddRefs(updRoot));
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if (NS_FAILED(nsrv)) {
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return false;
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}
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nsrv = updRoot->Create(nsIFile::DIRECTORY_TYPE, 0755);
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if (NS_FAILED(nsrv) && nsrv != NS_ERROR_FILE_ALREADY_EXISTS) {
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return false;
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}
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return NS_SUCCEEDED(crossProcessLock.Lock(updRoot, nullptr));
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}();
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if (!success) {
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sInProcessMutex.Unlock();
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}
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return success;
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}
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void UpdateMutexImpl::Unlock() {
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sInProcessMutex.AssertCurrentThreadOwns();
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mozilla::DebugOnly<nsresult> nsrv = mCrossProcessLock.Unlock();
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#ifdef DEBUG
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if (!NS_SUCCEEDED(nsrv)) {
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MOZ_CRASH_UNSAFE_PRINTF(
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"failed to unlock the update mutex's nsProfileLock -- got 0x%08x",
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static_cast<uint32_t>(nsrv.inspect()));
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}
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#endif
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sInProcessMutex.Unlock();
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}
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NS_IMPL_ISUPPORTS(nsUpdateMutex, nsIUpdateMutex)
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NS_IMETHODIMP nsUpdateMutex::IsLocked(bool* aResult) {
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*aResult = mIsLocked;
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return NS_OK;
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}
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NS_IMETHODIMP nsUpdateMutex::TryLock(bool* aResult) {
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if (!mIsLocked) {
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mIsLocked = mUpdateMutexImpl.TryLock();
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}
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*aResult = mIsLocked;
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return NS_OK;
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}
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NS_IMETHODIMP nsUpdateMutex::Unlock() MOZ_NO_THREAD_SAFETY_ANALYSIS {
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// Thread safety analysis cannot make sense out of a conditional release
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if (mIsLocked) {
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mUpdateMutexImpl.Unlock();
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mIsLocked = false;
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}
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return NS_OK;
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}
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