mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-06-01 17:41:34 +00:00
153 lines
4.0 KiB
C++
153 lines
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set sw=2 ts=8 et ft=cpp : */
|
|
/* 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 "mozilla/Assertions.h"
|
|
#include "mozilla/Logging.h"
|
|
#include "mozilla/ShmemPool.h"
|
|
#include "mozilla/Move.h"
|
|
|
|
#undef LOG
|
|
#undef LOG_ENABLED
|
|
extern mozilla::LazyLogModule gCamerasParentLog;
|
|
#define LOG(args) MOZ_LOG(gCamerasParentLog, mozilla::LogLevel::Debug, args)
|
|
#define LOG_ENABLED() MOZ_LOG_TEST(gCamerasParentLog, mozilla::LogLevel::Debug)
|
|
|
|
namespace mozilla {
|
|
|
|
ShmemPool::ShmemPool(size_t aPoolSize)
|
|
: mMutex("mozilla::ShmemPool"),
|
|
mPoolFree(aPoolSize)
|
|
#ifdef DEBUG
|
|
,mMaxPoolUse(0)
|
|
#endif
|
|
{
|
|
mShmemPool.SetLength(aPoolSize);
|
|
}
|
|
|
|
mozilla::ShmemBuffer ShmemPool::GetIfAvailable(size_t aSize)
|
|
{
|
|
MutexAutoLock lock(mMutex);
|
|
|
|
// Pool is empty, don't block caller.
|
|
if (mPoolFree == 0) {
|
|
// This isn't initialized, so will be understood as an error.
|
|
return ShmemBuffer();
|
|
}
|
|
|
|
ShmemBuffer& res = mShmemPool[mPoolFree - 1];
|
|
|
|
if (!res.mInitialized) {
|
|
LOG(("No free preallocated Shmem"));
|
|
return ShmemBuffer();
|
|
}
|
|
|
|
MOZ_ASSERT(res.mShmem.IsWritable(), "Pool in Shmem is not writable?");
|
|
|
|
if (res.mShmem.Size<char>() < aSize) {
|
|
LOG(("Free Shmem but not of the right size"));
|
|
return ShmemBuffer();
|
|
}
|
|
|
|
mPoolFree--;
|
|
#ifdef DEBUG
|
|
size_t poolUse = mShmemPool.Length() - mPoolFree;
|
|
if (poolUse > mMaxPoolUse) {
|
|
mMaxPoolUse = poolUse;
|
|
LOG(("Maximum ShmemPool use increased: %d buffers", mMaxPoolUse));
|
|
}
|
|
#endif
|
|
return Move(res);
|
|
}
|
|
|
|
template <class T>
|
|
mozilla::ShmemBuffer ShmemPool::Get(T* aInstance, size_t aSize)
|
|
{
|
|
MutexAutoLock lock(mMutex);
|
|
|
|
// Pool is empty, don't block caller.
|
|
if (mPoolFree == 0) {
|
|
// This isn't initialized, so will be understood as an error.
|
|
return ShmemBuffer();
|
|
}
|
|
|
|
ShmemBuffer& res = mShmemPool[mPoolFree - 1];
|
|
|
|
if (!res.mInitialized) {
|
|
LOG(("Initializing new Shmem in pool"));
|
|
if (!aInstance->AllocShmem(aSize, SharedMemory::TYPE_BASIC, &res.mShmem)) {
|
|
LOG(("Failure allocating new Shmem buffer"));
|
|
return ShmemBuffer();
|
|
}
|
|
res.mInitialized = true;
|
|
}
|
|
|
|
MOZ_ASSERT(res.mShmem.IsWritable(), "Shmem in Pool is not writable?");
|
|
|
|
// Prepare buffer, increase size if needed (we never shrink as we don't
|
|
// maintain seperate sized pools and we don't want to keep reallocating)
|
|
if (res.mShmem.Size<char>() < aSize) {
|
|
LOG(("Size change/increase in Shmem Pool"));
|
|
aInstance->DeallocShmem(res.mShmem);
|
|
res.mInitialized = false;
|
|
// this may fail; always check return value
|
|
if (!aInstance->AllocShmem(aSize, SharedMemory::TYPE_BASIC, &res.mShmem)) {
|
|
LOG(("Failure allocating resized Shmem buffer"));
|
|
return ShmemBuffer();
|
|
} else {
|
|
res.mInitialized = true;
|
|
}
|
|
}
|
|
|
|
MOZ_ASSERT(res.mShmem.IsWritable(), "Shmem in Pool is not writable post resize?");
|
|
|
|
mPoolFree--;
|
|
#ifdef DEBUG
|
|
size_t poolUse = mShmemPool.Length() - mPoolFree;
|
|
if (poolUse > mMaxPoolUse) {
|
|
mMaxPoolUse = poolUse;
|
|
LOG(("Maximum ShmemPool use increased: %d buffers", mMaxPoolUse));
|
|
}
|
|
#endif
|
|
return Move(res);
|
|
}
|
|
|
|
void ShmemPool::Put(ShmemBuffer&& aShmem)
|
|
{
|
|
MutexAutoLock lock(mMutex);
|
|
MOZ_ASSERT(mPoolFree < mShmemPool.Length());
|
|
mShmemPool[mPoolFree] = Move(aShmem);
|
|
mPoolFree++;
|
|
#ifdef DEBUG
|
|
size_t poolUse = mShmemPool.Length() - mPoolFree;
|
|
if (poolUse > 0) {
|
|
LOG(("ShmemPool usage reduced to %d buffers", poolUse));
|
|
}
|
|
#endif
|
|
}
|
|
|
|
template <class T>
|
|
void ShmemPool::Cleanup(T* aInstance)
|
|
{
|
|
MutexAutoLock lock(mMutex);
|
|
for (size_t i = 0; i < mShmemPool.Length(); i++) {
|
|
if (mShmemPool[i].mInitialized) {
|
|
aInstance->DeallocShmem(mShmemPool[i].Get());
|
|
mShmemPool[i].mInitialized = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
ShmemPool::~ShmemPool()
|
|
{
|
|
#ifdef DEBUG
|
|
for (size_t i = 0; i < mShmemPool.Length(); i++) {
|
|
MOZ_ASSERT(!mShmemPool[i].Valid());
|
|
}
|
|
#endif
|
|
}
|
|
|
|
} // namespace mozilla
|