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fine-tuned memory order for metadata manipulation

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joaquintides
2023-12-11 19:43:05 +01:00
parent b087f9fb53
commit b8d9605107
1 changed files with 4 additions and 2 deletions
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6
include/boost/unordered/detail/foa/concurrent_table.hpp
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@ -206,8 +206,8 @@ template<typename Integral>
struct atomic_integral struct atomic_integral
{ {
#if defined(BOOST_UNORDERED_LATCH_FREE) #if defined(BOOST_UNORDERED_LATCH_FREE)
operator Integral()const{return n.load();} operator Integral()const{return n.load(std::memory_order_acquire);}
void operator=(Integral m){n.store(m);} void operator=(Integral m){n.store(m,std::memory_order_release);}
void operator|=(Integral m){n.fetch_or(m);} void operator|=(Integral m){n.fetch_or(m);}
void operator&=(Integral m){n.fetch_and(m);} void operator&=(Integral m){n.fetch_and(m);}
@ -1564,6 +1564,8 @@ private:
goto startover; goto startover;
} }
auto lck=access(group_exclusive{},pos0); auto lck=access(group_exclusive{},pos0);
reinterpret_cast<std::atomic<unsigned char>*>(pg)[n].
load(std::memory_order_acquire);
if(BOOST_UNLIKELY(insert_counter(pos0)!=counter)){ if(BOOST_UNLIKELY(insert_counter(pos0)!=counter)){
/* other thread inserted from pos0, need to start over */ /* other thread inserted from pos0, need to start over */
pg->reset(n); pg->reset(n);