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//
// Copyright © 2019 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include "BufferManager.hpp"
#include "PacketBuffer.hpp"
namespace arm
{
namespace pipe
{
BufferManager::BufferManager(unsigned int numberOfBuffers, unsigned int maxPacketSize)
: m_MaxBufferSize(maxPacketSize),
m_NumberOfBuffers(numberOfBuffers),
m_MaxNumberOfBuffers(numberOfBuffers * 3),
m_CurrentNumberOfBuffers(numberOfBuffers)
{
Initialize();
}
IPacketBufferPtr BufferManager::Reserve(unsigned int requestedSize, unsigned int& reservedSize)
{
reservedSize = 0;
std::unique_lock<std::mutex> availableListLock(m_AvailableMutex, std::defer_lock);
if (requestedSize > m_MaxBufferSize)
{
return nullptr;
}
availableListLock.lock();
if (m_AvailableList.empty())
{
if (m_CurrentNumberOfBuffers < m_MaxNumberOfBuffers)
{
// create a temporary overflow/surge buffer and hand it back
m_CurrentNumberOfBuffers++;
availableListLock.unlock();
IPacketBufferPtr buffer = std::make_unique<PacketBuffer>(m_MaxBufferSize);
reservedSize = requestedSize;
return buffer;
}
else
{
// we have totally busted the limit. call a halt to new memory allocations.
availableListLock.unlock();
return nullptr;
}
}
IPacketBufferPtr buffer = std::move(m_AvailableList.back());
m_AvailableList.pop_back();
availableListLock.unlock();
reservedSize = requestedSize;
return buffer;
}
void BufferManager::Commit(IPacketBufferPtr& packetBuffer, unsigned int size, bool notifyConsumer)
{
std::unique_lock<std::mutex> readableListLock(m_ReadableMutex, std::defer_lock);
packetBuffer->Commit(size);
readableListLock.lock();
m_ReadableList.push(std::move(packetBuffer));
readableListLock.unlock();
if (notifyConsumer)
{
FlushReadList();
}
}
void BufferManager::Initialize()
{
m_AvailableList.reserve(m_NumberOfBuffers);
m_CurrentNumberOfBuffers = m_NumberOfBuffers;
for (unsigned int i = 0; i < m_NumberOfBuffers; ++i)
{
IPacketBufferPtr buffer = std::make_unique<PacketBuffer>(m_MaxBufferSize);
m_AvailableList.emplace_back(std::move(buffer));
}
}
void BufferManager::Release(IPacketBufferPtr& packetBuffer)
{
std::unique_lock<std::mutex> availableListLock(m_AvailableMutex, std::defer_lock);
packetBuffer->Release();
availableListLock.lock();
if (m_AvailableList.size() <= m_NumberOfBuffers)
{
m_AvailableList.push_back(std::move(packetBuffer));
}
else
{
// we have been handed a temporary overflow/surge buffer get rid of it
packetBuffer->Destroy();
if (m_CurrentNumberOfBuffers > m_NumberOfBuffers)
{
--m_CurrentNumberOfBuffers;
}
}
availableListLock.unlock();
}
void BufferManager::Reset()
{
//This method should only be called once all threads have been joined
std::lock_guard<std::mutex> readableListLock(m_ReadableMutex);
std::lock_guard<std::mutex> availableListLock(m_AvailableMutex);
m_AvailableList.clear();
std::queue<IPacketBufferPtr>().swap(m_ReadableList);
Initialize();
}
IPacketBufferPtr BufferManager::GetReadableBuffer()
{
std::unique_lock<std::mutex> readableListLock(m_ReadableMutex);
if (!m_ReadableList.empty())
{
IPacketBufferPtr buffer = std::move(m_ReadableList.front());
m_ReadableList.pop();
readableListLock.unlock();
return buffer;
}
return nullptr;
}
void BufferManager::MarkRead(IPacketBufferPtr& packetBuffer)
{
std::unique_lock<std::mutex> availableListLock(m_AvailableMutex, std::defer_lock);
packetBuffer->MarkRead();
availableListLock.lock();
if (m_AvailableList.size() <= m_NumberOfBuffers)
{
m_AvailableList.push_back(std::move(packetBuffer));
}
else
{
// we have been handed a temporary overflow/surge buffer get rid of it
packetBuffer->Destroy();
if (m_CurrentNumberOfBuffers > m_NumberOfBuffers)
{
--m_CurrentNumberOfBuffers;
}
}
availableListLock.unlock();
}
void BufferManager::SetConsumer(IConsumer* consumer)
{
m_Consumer = consumer;
}
void BufferManager::FlushReadList()
{
// notify consumer that packet is ready to read
if (m_Consumer != nullptr)
{
m_Consumer->SetReadyToRead();
}
}
} // namespace pipe
} // namespace arm
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