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tran_buf_pool.h
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tran_buf_pool.h
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// Copyright (c) 2014 Baidu.com, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Author: qinzuoyan01@baidu.com (Qin Zuoyan)
#ifndef _SOFA_PBRPC_TRAN_BUF_POOL_H_
#define _SOFA_PBRPC_TRAN_BUF_POOL_H_
#include <sofa/pbrpc/common_internal.h>
#ifndef SOFA_PBRPC_TRAN_BUF_BLOCK_SIZE
#define SOFA_PBRPC_TRAN_BUF_BLOCK_SIZE (1024u - sizeof(RefCountType))
#endif
namespace sofa {
namespace pbrpc {
// Reference counted tran buf pool.
// Thread safe.
class TranBufPool
{
public:
typedef int RefCountType;
// Get the size of single block.
inline static int block_size()
{
return static_cast<int>(SOFA_PBRPC_TRAN_BUF_BLOCK_SIZE);
}
// Allocate a block. Return NULL if failed.
//
// Postconditions:
// * If succeed, the reference count of the block is equal to 1.
inline static void * malloc()
{
void * p = ::malloc(SOFA_PBRPC_TRAN_BUF_BLOCK_SIZE + sizeof(RefCountType));
if (p != NULL)
{
*(reinterpret_cast<RefCountType*>(p)) = 1;
p = reinterpret_cast<RefCountType*>(p) + 1;
}
return p;
}
// Increase the reference count of the block.
//
// Preconditions:
// * The block pointed by "p" was allocated by this pool and is in use currently.
inline static void add_ref(void * p)
{
sofa::pbrpc::atomic_inc(reinterpret_cast<RefCountType*>(p) - 1);
}
// Decrease the reference count of the block. If the reference count equals
// to 0 afterward, then put the block back to the free list
//
// Preconditions:
// * The block pointed by "p" was allocated by this pool and is in use currently.
inline static void free(void * p)
{
if (sofa::pbrpc::atomic_dec_ret_old(reinterpret_cast<RefCountType*>(p) - 1) == 1)
{
::free(reinterpret_cast<RefCountType*>(p) - 1);
}
}
}; // class TranBufPool
} // namespace pbrpc
} // namespace sofa
#endif // _SOFA_PBRPC_TRAN_BUF_POOL_H_
/* vim: set ts=4 sw=4 sts=4 tw=100 */