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[857] | 1 | /*
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| 2 | * Copyright (c) 2002
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| 3 | * John Maddock
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| 4 | *
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| 5 | * Use, modification and distribution are subject to the
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| 6 | * Boost Software License, Version 1.0. (See accompanying file
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| 7 | * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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| 8 | *
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| 9 | */
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| 10 |
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| 11 | /*
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| 12 | * LOCATION: see http://www.boost.org for most recent version.
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| 13 | * FILE mem_block_cache.hpp
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| 14 | * VERSION see <boost/version.hpp>
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| 15 | * DESCRIPTION: memory block cache used by the non-recursive matcher.
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| 16 | */
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| 17 |
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| 18 | #ifndef BOOST_REGEX_V4_MEM_BLOCK_CACHE_HPP
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| 19 | #define BOOST_REGEX_V4_MEM_BLOCK_CACHE_HPP
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| 20 |
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| 21 | #include <new>
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| 22 | #ifdef BOOST_HAS_THREADS
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| 23 | #include <boost/regex/pending/static_mutex.hpp>
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| 24 | #endif
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| 25 |
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| 26 | #ifdef BOOST_HAS_ABI_HEADERS
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| 27 | # include BOOST_ABI_PREFIX
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| 28 | #endif
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| 29 |
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| 30 | namespace boost{
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| 31 | namespace re_detail{
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| 32 |
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| 33 | struct mem_block_node
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| 34 | {
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| 35 | mem_block_node* next;
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| 36 | };
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| 37 |
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| 38 | struct mem_block_cache
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| 39 | {
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| 40 | // this member has to be statically initialsed:
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| 41 | mem_block_node* next;
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| 42 | unsigned cached_blocks;
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| 43 | #ifdef BOOST_HAS_THREADS
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| 44 | boost::static_mutex mut;
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| 45 | #endif
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| 46 |
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| 47 | ~mem_block_cache()
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| 48 | {
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| 49 | while(next)
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| 50 | {
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| 51 | mem_block_node* old = next;
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| 52 | next = next->next;
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| 53 | ::operator delete(old);
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| 54 | }
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| 55 | }
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| 56 | void* get()
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| 57 | {
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| 58 | #ifdef BOOST_HAS_THREADS
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| 59 | boost::static_mutex::scoped_lock g(mut);
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| 60 | #endif
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| 61 | if(next)
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| 62 | {
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| 63 | mem_block_node* result = next;
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| 64 | next = next->next;
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| 65 | --cached_blocks;
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| 66 | return result;
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| 67 | }
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| 68 | return ::operator new(BOOST_REGEX_BLOCKSIZE);
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| 69 | }
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| 70 | void put(void* p)
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| 71 | {
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| 72 | #ifdef BOOST_HAS_THREADS
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| 73 | boost::static_mutex::scoped_lock g(mut);
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| 74 | #endif
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| 75 | if(cached_blocks >= BOOST_REGEX_MAX_CACHE_BLOCKS)
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| 76 | {
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| 77 | ::operator delete(p);
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| 78 | }
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| 79 | else
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| 80 | {
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| 81 | mem_block_node* old = static_cast<mem_block_node*>(p);
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| 82 | old->next = next;
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| 83 | next = old;
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| 84 | ++cached_blocks;
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| 85 | }
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| 86 | }
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| 87 | };
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| 88 |
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| 89 | extern mem_block_cache block_cache;
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| 90 |
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| 91 | }
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| 92 | } // namespace boost
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| 93 |
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| 94 | #ifdef BOOST_HAS_ABI_HEADERS
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| 95 | # include BOOST_ABI_SUFFIX
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| 96 | #endif
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| 97 |
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| 98 | #endif
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| 99 |
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