100 lines
2.0 KiB
C++
100 lines
2.0 KiB
C++
/*
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* Copyright (c) 2002
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* John Maddock
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*
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* Use, modification and distribution are subject to the
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* Boost Software License, Version 1.0. (See accompanying file
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* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*
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*/
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/*
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* LOCATION: see http://www.boost.org for most recent version.
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* FILE mem_block_cache.hpp
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* VERSION see <boost/version.hpp>
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* DESCRIPTION: memory block cache used by the non-recursive matcher.
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*/
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#ifndef BOOST_REGEX_V4_MEM_BLOCK_CACHE_HPP
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#define BOOST_REGEX_V4_MEM_BLOCK_CACHE_HPP
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#include <new>
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#ifdef BOOST_HAS_THREADS
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#include <boost/regex/pending/static_mutex.hpp>
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#endif
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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namespace boost{
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namespace re_detail{
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struct mem_block_node
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{
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mem_block_node* next;
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};
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struct mem_block_cache
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{
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// this member has to be statically initialsed:
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mem_block_node* next;
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unsigned cached_blocks;
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#ifdef BOOST_HAS_THREADS
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boost::static_mutex mut;
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#endif
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~mem_block_cache()
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{
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while(next)
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{
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mem_block_node* old = next;
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next = next->next;
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::operator delete(old);
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}
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}
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void* get()
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{
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#ifdef BOOST_HAS_THREADS
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boost::static_mutex::scoped_lock g(mut);
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#endif
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if(next)
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{
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mem_block_node* result = next;
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next = next->next;
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--cached_blocks;
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return result;
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}
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return ::operator new(BOOST_REGEX_BLOCKSIZE);
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}
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void put(void* p)
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{
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#ifdef BOOST_HAS_THREADS
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boost::static_mutex::scoped_lock g(mut);
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#endif
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if(cached_blocks >= BOOST_REGEX_MAX_CACHE_BLOCKS)
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{
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::operator delete(p);
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}
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else
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{
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mem_block_node* old = static_cast<mem_block_node*>(p);
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old->next = next;
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next = old;
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++cached_blocks;
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}
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}
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};
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extern mem_block_cache block_cache;
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}
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} // namespace boost
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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#endif
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