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Lockfree mem_block_cache only active if std::atomic is available

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Yucheng Low
2015-12-31 15:46:20 -08:00
parent 3f14031142
commit a0dfd81516
2 changed files with 3 additions and 16 deletions
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17
include/boost/regex/v4/mem_block_cache.hpp
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@ -19,18 +19,12 @@
#define BOOST_REGEX_V4_MEM_BLOCK_CACHE_HPP
#include <new>
#include <boost/atomic/atomic.hpp>
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
#ifdef BOOST_NO_CXX11_HDR_ATOMIC
#if BOOST_ATOMIC_POINTER_LOCK_FREE == 2
#define BOOST_REGEX_MEM_BLOCK_CACHE_LOCK_FREE
#define BOOST_REGEX_ATOMIC_POINTER boost::atomic
#endif
#else // BOOST_NOCXX11_HDR_ATOMIC not defined
#ifndef BOOST_NO_CXX11_HDR_ATOMIC
#include <atomic>
#if ATOMIC_POINTER_LOCK_FREE == 2
#define BOOST_REGEX_MEM_BLOCK_CACHE_LOCK_FREE
@ -44,14 +38,8 @@ namespace BOOST_REGEX_DETAIL_NS{
#ifdef BOOST_REGEX_MEM_BLOCK_CACHE_LOCK_FREE /* lock free implementation */
struct mem_block_cache
{
BOOST_REGEX_ATOMIC_POINTER<void*> cache[BOOST_REGEX_MAX_CACHE_BLOCKS];
std::atomic<void*> cache[BOOST_REGEX_MAX_CACHE_BLOCKS];
mem_block_cache() {
for (size_t i = 0;i < BOOST_REGEX_MAX_CACHE_BLOCKS; ++i) {
cache[i].store(NULL);
}
}
~mem_block_cache()
{
for (size_t i = 0;i < BOOST_REGEX_MAX_CACHE_BLOCKS; ++i) {
@ -80,7 +68,6 @@ struct mem_block_cache
}
};
#undef BOOST_REGEX_ATOMIC_POINTER
#else /* lock-based implementation */