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/* Copyright (c) 2003, 2006, 2007 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
#ifndef RWPOOL_HPP
#define RWPOOL_HPP
#include "Pool.hpp"
struct RWPage
{
STATIC_CONST( RWPAGE_WORDS = GLOBAL_PAGE_SIZE_WORDS - 4 );
Uint32 m_type_id;
Uint16 m_first_free;
Uint16 m_ref_count;
Uint32 m_next_page;
Uint32 m_prev_page;
Uint32 m_data[RWPAGE_WORDS];
};
/**
* Read Write Pool
*/
struct RWPool
{
Record_info m_record_info;
RWPage* m_memroot;
RWPage* m_current_page;
Pool_context m_ctx;
Uint32 m_first_free_page;
Uint32 m_current_page_no;
Uint16 m_current_pos;
Uint16 m_current_first_free;
Uint16 m_current_ref_count;
public:
RWPool();
void init(const Record_info& ri, const Pool_context& pc);
bool seize(Ptr<void>&);
void release(Ptr<void>);
void * getPtr(Uint32 i);
private:
void handle_invalid_release(Ptr<void>);
void handle_invalid_get_ptr(Uint32 i);
};
inline
void*
RWPool::getPtr(Uint32 i)
{
Uint32 page_no = i >> POOL_RECORD_BITS;
Uint32 page_idx = i & POOL_RECORD_MASK;
RWPage * page = m_memroot + page_no;
Uint32 * record = page->m_data + page_idx;
Uint32 magic_val = * (record + m_record_info.m_offset_magic);
if (likely(magic_val == ~(Uint32)m_record_info.m_type_id))
{
return record;
}
handle_invalid_get_ptr(i);
return 0; /* purify: deadcode */
}
#endif
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