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39 lines
1.6 KiB
39 lines
1.6 KiB
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _SLAB_H_
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#define _SLAB_H_
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#include <stdint.h>
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struct SlabAllocator;
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//thread/interrupt safe. allocations will not fail if space exists. even in interrupts.
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//itemAlign over 4 will not be guaranteed since the heap does not hand out chunks with that kind of alignment
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struct SlabAllocator* slabAllocatorNew(uint32_t itemSz, uint32_t itemAlign, uint32_t numItems);
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void slabAllocatorDestroy(struct SlabAllocator *allocator);
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void* slabAllocatorAlloc(struct SlabAllocator *allocator);
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void slabAllocatorFree(struct SlabAllocator *allocator, void *ptr);
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void* slabAllocatorGetNth(struct SlabAllocator *allocator, uint32_t idx); // -> pointer or NULL if that slot is empty may be not int-safe. YMMV
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uint32_t slabAllocatorGetIndex(struct SlabAllocator *allocator, void *ptr); // -> index or -1 if invalid pointer
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uint32_t slabAllocatorGetNumItems(struct SlabAllocator *allocator); // simply say hwo many items it can hold max (numItems passed to constructor)
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#endif
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