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// MemBlocks.cpp
#include "StdAfx.h"
#include "../../../C/Alloc.h"
#include "MemBlocks.h"
#include "StreamUtils.h"
bool CMemBlockManager::AllocateSpace(size_t numBlocks)
{
FreeSpace();
if (_blockSize < sizeof(void *) || numBlocks < 1)
return false;
size_t totalSize = numBlocks * _blockSize;
if (totalSize / _blockSize != numBlocks)
return false;
_data = ::MidAlloc(totalSize);
if (_data == 0)
return false;
Byte *p = (Byte *)_data;
for (size_t i = 0; i + 1 < numBlocks; i++, p += _blockSize)
*(Byte **)p = (p + _blockSize);
*(Byte **)p = 0;
_headFree = _data;
return true;
}
void CMemBlockManager::FreeSpace()
{
::MidFree(_data);
_data = 0;
_headFree= 0;
}
void *CMemBlockManager::AllocateBlock()
{
if (_headFree == 0)
return 0;
void *p = _headFree;
_headFree = *(void **)_headFree;
return p;
}
void CMemBlockManager::FreeBlock(void *p)
{
if (p == 0)
return;
*(void **)p = _headFree;
_headFree = p;
}
HRes CMemBlockManagerMt::AllocateSpace(size_t numBlocks, size_t numNoLockBlocks)
{
if (numNoLockBlocks > numBlocks)
return E_INVALIDARG;
if (!CMemBlockManager::AllocateSpace(numBlocks))
return E_OUTOFMEMORY;
size_t numLockBlocks = numBlocks - numNoLockBlocks;
Semaphore.Close();
return Semaphore.Create((LONG)numLockBlocks, (LONG)numLockBlocks);
}
HRes CMemBlockManagerMt::AllocateSpaceAlways(size_t desiredNumberOfBlocks, size_t numNoLockBlocks)
{
if (numNoLockBlocks > desiredNumberOfBlocks)
return E_INVALIDARG;
for (;;)
{
if (AllocateSpace(desiredNumberOfBlocks, numNoLockBlocks) == 0)
return 0;
if (desiredNumberOfBlocks == numNoLockBlocks)
return E_OUTOFMEMORY;
desiredNumberOfBlocks = numNoLockBlocks + ((desiredNumberOfBlocks - numNoLockBlocks) >> 1);
}
}
void CMemBlockManagerMt::FreeSpace()
{
Semaphore.Close();
CMemBlockManager::FreeSpace();
}
void *CMemBlockManagerMt::AllocateBlock()
{
// Semaphore.Lock();
NWindows::NSynchronization::CCriticalSectionLock lock(_criticalSection);
return CMemBlockManager::AllocateBlock();
}
void CMemBlockManagerMt::FreeBlock(void *p, bool lockMode)
{
if (p == 0)
return;
{
NWindows::NSynchronization::CCriticalSectionLock lock(_criticalSection);
CMemBlockManager::FreeBlock(p);
}
if (lockMode)
Semaphore.Release();
}
void CMemBlocks::Free(CMemBlockManagerMt *manager)
{
while(Blocks.Size() > 0)
{
manager->FreeBlock(Blocks.Back());
Blocks.DeleteBack();
}
TotalSize = 0;
}
void CMemBlocks::FreeOpt(CMemBlockManagerMt *manager)
{
Free(manager);
Blocks.ClearAndFree();
}
HRESULT CMemBlocks::WriteToStream(size_t blockSize, ISequentialOutStream *outStream) const
{
UInt64 totalSize = TotalSize;
for (int blockIndex = 0; totalSize > 0; blockIndex++)
{
UInt32 curSize = (UInt32)blockSize;
if (totalSize < curSize)
curSize = (UInt32)totalSize;
if (blockIndex >= Blocks.Size())
return E_FAIL;
RINOK(WriteStream(outStream, Blocks[blockIndex], curSize));
totalSize -= curSize;
}
return S_OK;
}
void CMemLockBlocks::FreeBlock(int index, CMemBlockManagerMt *memManager)
{
memManager->FreeBlock(Blocks[index], LockMode);
Blocks[index] = 0;
}
void CMemLockBlocks::Free(CMemBlockManagerMt *memManager)
{
while (Blocks.Size() > 0)
{
FreeBlock(Blocks.Size() - 1, memManager);
Blocks.DeleteBack();
}
TotalSize = 0;
}
HRes CMemLockBlocks::SwitchToNoLockMode(CMemBlockManagerMt *memManager)
{
if (LockMode)
{
if (Blocks.Size() > 0)
{
RINOK(memManager->ReleaseLockedBlocks(Blocks.Size()));
}
LockMode = false;
}
return 0;
}
void CMemLockBlocks::Detach(CMemLockBlocks &blocks, CMemBlockManagerMt *memManager)
{
blocks.Free(memManager);
blocks.LockMode = LockMode;
UInt64 totalSize = 0;
size_t blockSize = memManager->GetBlockSize();
for (int i = 0; i < Blocks.Size(); i++)
{
if (totalSize < TotalSize)
blocks.Blocks.Add(Blocks[i]);
else
FreeBlock(i, memManager);
Blocks[i] = 0;
totalSize += blockSize;
}
blocks.TotalSize = TotalSize;
Free(memManager);
}
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