5d6551d69f
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20841 a95241bf-73f2-0310-859d-f6bbb57e9c96
57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
/*
|
|
* Copyright 2007, Hugo Santos. All Rights Reserved.
|
|
* Distributed under the terms of the MIT License.
|
|
*
|
|
* Authors:
|
|
* Hugo Santos, hugosantos@gmail.com
|
|
*/
|
|
|
|
#ifndef _SLAB_STRATEGY_H_
|
|
#define _SLAB_STRATEGY_H_
|
|
|
|
#include <slab/Base.h>
|
|
|
|
|
|
template<typename Backend>
|
|
class BaseCacheStrategy {
|
|
protected:
|
|
typedef cache_slab BaseSlab;
|
|
|
|
BaseCacheStrategy(base_cache *parent)
|
|
: fParent(parent) {}
|
|
|
|
size_t SlabSize(size_t tailSpace) const
|
|
{
|
|
size_t pageCount = ((kMinimumSlabItems * fParent->object_size
|
|
+ tailSpace) + Backend::kPageSize / 2) / Backend::kPageSize;
|
|
if (pageCount < 1)
|
|
pageCount = 1;
|
|
return pageCount * Backend::kPageSize;
|
|
}
|
|
|
|
struct Slab : BaseSlab {
|
|
typename Backend::AllocationID id;
|
|
};
|
|
|
|
BaseSlab *_ConstructSlab(Slab *slab, void *pages, size_t byteCount,
|
|
void *parent, base_cache_owner_prepare prepare,
|
|
base_cache_owner_unprepare unprepare)
|
|
{
|
|
return base_cache_construct_slab(fParent, slab, pages, byteCount,
|
|
parent, prepare, unprepare);
|
|
}
|
|
|
|
void _DestructSlab(BaseSlab *slab, void *parent,
|
|
base_cache_owner_unprepare unprepare)
|
|
{
|
|
base_cache_destruct_slab(fParent, slab, parent, unprepare);
|
|
Backend::FreePages(fParent, ((Slab *)slab)->id);
|
|
}
|
|
|
|
base_cache *Parent() const { return fParent; }
|
|
|
|
base_cache *fParent;
|
|
};
|
|
|
|
#endif
|