forked from boostorg/regex
b9f55efe98
This *significantly* improves parallel performance of regex. Currently if I have a large number of threads all using regexes; even if they are using idependent regex objects, performance is still extremely poor due to the lock inside of the mem_block_cache.
80 lines
1.8 KiB
C++
80 lines
1.8 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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#include <boost/atomic/atomic.hpp>
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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 BOOST_REGEX_DETAIL_NS{
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struct mem_block_cache
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{
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boost::atomic<void*> cache[BOOST_REGEX_MAX_CACHE_BLOCKS];
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mem_block_cache() {
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for (size_t i = 0;i < BOOST_REGEX_MAX_CACHE_BLOCKS; ++i) {
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cache[i].store(NULL);
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}
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}
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~mem_block_cache()
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{
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for (size_t i = 0;i < BOOST_REGEX_MAX_CACHE_BLOCKS; ++i) {
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if (cache[i].load()) ::operator delete(cache[i].load());
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}
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}
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void* get()
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{
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for (size_t i = 0;i < BOOST_REGEX_MAX_CACHE_BLOCKS; ++i) {
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void* p = cache[i].load();
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if (p != NULL) {
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if (cache[i].compare_exchange_strong(p, NULL)) return p;
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}
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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* ptr)
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{
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for (size_t i = 0;i < BOOST_REGEX_MAX_CACHE_BLOCKS; ++i) {
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void* p = cache[i].load();
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if (p == NULL) {
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if (cache[i].compare_exchange_strong(p, ptr)) return;
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}
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}
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::operator delete(ptr);
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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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