MemPool.h

/****************************************************************************
 * modules/include/memutils/memory_manager/MemPool.h
 *
 *   Copyright 2018 Sony Semiconductor Solutions Corporation
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 * Redistribution and use in source and binary forms, with or without
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#ifndef MEMPOOL_H_INCLUDED
#define MEMPOOL_H_INCLUDED
 
#include "memutils/memory_manager/RuntimeQue.h"
#include "memutils/memory_manager/MemMgrTypes.h"
 
/* Virtual function is prohibited for the following reason.
 * - Text Non-shared multicore can not use virtual function.
 * - By using virtual function 4 bytes size increases for each instance.
 */
 
namespace MemMgrLite {
 
/*****************************************************************
 * Memory pool base class (16 or 20bytes)
 *****************************************************************/
class MemPool : CopyGuard {
    friend class Manager;
protected:
    MemPool(const PoolSectionAttr& attr, FastMemAlloc& fma);
    ~MemPool();
 
  /* Since exceptions can not be used, constructor errors are
   * checked with this function.
   */
 
    bool isFailed() {
        if (m_seg_no_que.que_area() == NULL || m_ref_cnt_array == NULL) {
            return true;
        }
        return false;
    }
 
    PoolId      getPoolId()   const { return m_attr.id; }
    PoolType    getPoolType() const { return m_attr.type; }
    PoolAddr    getPoolAddr() const { return m_attr.addr; }
    PoolSize    getPoolSize() const { return m_attr.size; }
    NumSeg      getPoolNumSegs() const { return m_attr.num_segs; }
    NumSeg      getPoolNumAvailSegs() const { return m_seg_no_que.size(); }
#ifdef CONFIG_MEMUTILS_MEMORY_MANAGER_USE_FENCE
    bool        isPoolFenceEnable() const { return m_attr.fence; }
    void        initPoolFence();
    uint32_t    verifyPoolFence();
#endif
#ifdef USE_MEMMGR_MULTI_CORE
    LockId      getPoolLockId() const { return m_attr.spl_id; }
#endif
 
  /* Get and update of segment reference counter value. */
 
    SegRefCnt   getSegRefCnt(NumSeg seg_no) const {
        D_ASSERT(seg_no != NullSegNo && seg_no <= getPoolNumSegs());
        D_ASSERT(m_ref_cnt_array[seg_no - 1] != 0); /* It should be in use. */
        return m_ref_cnt_array[seg_no - 1];
    }
    void        incSegRefCnt(NumSeg seg_no);
 
  /* Store the memory segment in use on the memory handle and
   * return the stored number.
   */
 
    uint32_t    getUsedSegs(MemHandleBase* mhs, uint32_t num_mhs);
 
  /* Get a segment from the memory pool.
   * Exclusive control should be done on the caller side.
   */
 
    MemHandleProxy  allocSeg();
 
  /* Subtract the reference counter and return the segment
   * if there is no reference.
   * Exclusive control should be done on the caller side.
   */
 
    void    freeSeg(MemHandleBase& mh);
 
protected:
  /* In the case of a static pool, it points to the corresponding part
   * of MemoryPoolLayouts.
   * When dynamic pooling, address rewriting, etc. are necessary,
   * separate PoolAttr storage places should be prepared
   */
 
    const PoolSectionAttr&  m_attr;     /* pool attributes */
 
  /* A queue (8 or 12 bytes) holding an usable segment number (1 origin).
   * It is necessary to separately prepare the area for queue data.
   */
 
    RuntimeQue<NumSeg, NumSeg>  m_seg_no_que;
 
  /* Pointer to segment reference counter array.
   * If you do not store the pointer and set it to
   * SegRefCnt m_ref_cnt_array[0], you can save 4 bytes.
   * However, you can not have data members in this class inheritance class.
   */
 
    SegRefCnt* const    m_ref_cnt_array;
}; /* class MemPool */
 
} /* namespace MemMgrLite */
 
#endif /* MEMPOOL_H_INCLUDED */