gecko-dev/dom/quota/QuotaObject.cpp

160 строки
3.6 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=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 "QuotaObject.h"
#include "QuotaManager.h"
USING_QUOTA_NAMESPACE
void
QuotaObject::AddRef()
{
QuotaManager* quotaManager = QuotaManager::Get();
if (!quotaManager) {
NS_ERROR("Null quota manager, this shouldn't happen, possible leak!");
NS_AtomicIncrementRefcnt(mRefCnt);
return;
}
MutexAutoLock lock(quotaManager->mQuotaMutex);
++mRefCnt;
}
void
QuotaObject::Release()
{
QuotaManager* quotaManager = QuotaManager::Get();
if (!quotaManager) {
NS_ERROR("Null quota manager, this shouldn't happen, possible leak!");
nsrefcnt count = NS_AtomicDecrementRefcnt(mRefCnt);
if (count == 0) {
mRefCnt = 1;
delete this;
}
return;
}
{
MutexAutoLock lock(quotaManager->mQuotaMutex);
--mRefCnt;
if (mRefCnt > 0) {
return;
}
if (mOriginInfo) {
mOriginInfo->mQuotaObjects.Remove(mPath);
}
}
delete this;
}
void
QuotaObject::UpdateSize(int64_t aSize)
{
QuotaManager* quotaManager = QuotaManager::Get();
NS_ASSERTION(quotaManager, "Shouldn't be null!");
MutexAutoLock lock(quotaManager->mQuotaMutex);
if (mOriginInfo) {
mOriginInfo->mUsage -= mSize;
mSize = aSize;
mOriginInfo->mUsage += mSize;
}
}
bool
QuotaObject::MaybeAllocateMoreSpace(int64_t aOffset, int32_t aCount)
{
int64_t end = aOffset + aCount;
QuotaManager* quotaManager = QuotaManager::Get();
NS_ASSERTION(quotaManager, "Shouldn't be null!");
MutexAutoLock lock(quotaManager->mQuotaMutex);
if (mSize >= end || !mOriginInfo) {
return true;
}
int64_t newUsage = mOriginInfo->mUsage - mSize + end;
if (newUsage > mOriginInfo->mLimit) {
// This will block the thread, but it will also drop the mutex while
// waiting. The mutex will be reacquired again when the waiting is finished.
if (!quotaManager->LockedQuotaIsLifted()) {
return false;
}
// Threads raced, the origin info removal has been done by some other
// thread.
if (!mOriginInfo) {
// The other thread could allocate more space.
if (end > mSize) {
mSize = end;
}
return true;
}
nsCString origin = mOriginInfo->mOrigin;
mOriginInfo->LockedClearOriginInfos();
NS_ASSERTION(!mOriginInfo,
"Should have cleared in LockedClearOriginInfos!");
quotaManager->mOriginInfos.Remove(origin);
// Some other thread could increase the size without blocking (increasing
// the origin usage without hitting the limit), but no more than this one.
NS_ASSERTION(mSize < end, "This shouldn't happen!");
mSize = end;
return true;
}
mOriginInfo->mUsage = newUsage;
mSize = end;
return true;
}
#ifdef DEBUG
void
OriginInfo::LockedClearOriginInfos()
{
QuotaManager* quotaManager = QuotaManager::Get();
NS_ASSERTION(quotaManager, "Shouldn't be null!");
quotaManager->mQuotaMutex.AssertCurrentThreadOwns();
mQuotaObjects.EnumerateRead(ClearOriginInfoCallback, nullptr);
}
#endif
// static
PLDHashOperator
OriginInfo::ClearOriginInfoCallback(const nsAString& aKey,
QuotaObject* aValue,
void* aUserArg)
{
NS_ASSERTION(!aKey.IsEmpty(), "Empty key!");
NS_ASSERTION(aValue, "Null pointer!");
aValue->mOriginInfo = nullptr;
return PL_DHASH_NEXT;
}