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optimized non-visiting insertion

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This commit is contained in:
joaquintides
2023-12-12 13:35:48 +01:00
parent 8ac326b39f
commit 64614f1670
1 changed files with 10 additions and 7 deletions
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17
include/boost/unordered/detail/foa/concurrent_table.hpp
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@ -1402,7 +1402,7 @@ private:
template<typename... Args>
BOOST_FORCEINLINE bool construct_and_emplace(Args&&... args)
{
#if defined(BOOST_UNORDERED_LATCH_FREE)
#if 0 && defined(BOOST_UNORDERED_LATCH_FREE)
return construct_and_emplace_or_visit(
group_synchronized_shared{},[](const value_type&){},std::forward<Args>(args)...);
#else
@ -1457,7 +1457,7 @@ private:
template<typename... Args>
BOOST_FORCEINLINE bool emplace_impl(Args&&... args)
{
#if defined(BOOST_UNORDERED_LATCH_FREE)
#if 0 && defined(BOOST_UNORDERED_LATCH_FREE)
return emplace_or_visit_impl(
group_synchronized_shared{},
[](const value_type&){},std::forward<Args>(args)...);
@ -1584,7 +1584,11 @@ private:
for(;;){
startover:
boost::uint32_t counter=insert_counter(pos0);
boost::uint32_t counter=0;
{
auto lck=access(group_exclusive{},pos0);
counter=insert_counter(pos0);
}
if(unprotected_visit(
access_mode,k,pos0,hash,std::forward<F>(f)))return 0;
@ -1602,15 +1606,14 @@ private:
/* slot wasn't empty */
goto startover;
}
auto lck=access(group_exclusive{},pos);
auto p=this->arrays.elements()+pos*N+n;
this->construct_element(p,std::forward<Args>(args)...);
auto lck=access(group_exclusive{},pos0);
if(BOOST_UNLIKELY(insert_counter(pos0)++!=counter)){
/* other thread inserted from pos0, need to start over */
this->destroy_element(p);
pg->reset(n);
goto startover;
}
auto p=this->arrays.elements()+pos*N+n;
this->construct_element(p,std::forward<Args>(args)...);
pg->set(n,hash);
rsize.commit();
return 1;