64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef OCEANBASE_RPC_OB_REUSABLE_MEM_H_
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#define OCEANBASE_RPC_OB_REUSABLE_MEM_H_
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#include "lib/oblog/ob_log.h"
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namespace oceanbase
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{
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namespace rpc
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{
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class ObReusableMem
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{
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public:
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enum { N_PTR = 4 };
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struct MemPtr
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{
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void set(void* p, int64_t sz) {
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ptr_ = p;
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size_ = sz;
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}
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void* ptr_;
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int64_t size_;
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};
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public:
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ObReusableMem(): nptr_(0), mask_(0) {}
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~ObReusableMem() {}
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void reuse() { mask_ = (1U<<nptr_) - 1; }
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void* alloc(int32_t size)
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{
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void* p = NULL;
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for(int i = 0; NULL == p && i < nptr_; i++) {
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if ((mask_ & (1<<i)) && ptr_[i].size_ == size) {
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p = ptr_[i].ptr_;
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mask_ &= ~(1U<<i);
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}
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}
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return p;
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}
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void add(void* ptr, int64_t size)
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{
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if (nptr_ < N_PTR) {
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ptr_[nptr_++].set(ptr, size);
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}
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}
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private:
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int32_t nptr_;
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uint32_t mask_;
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MemPtr ptr_[N_PTR];
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};
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}; // end namespace rpc
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}; // end namespace oceanbase
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#endif /* OCEANBASE_RPC_OB_REUSABLE_MEM_H_ */
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