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