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Change lock type

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No additional features of std::unique_lock has been previously used
so it's better to use a lighter lock.

closes https://github.com/official-stockfish/Stockfish/pull/3284

No functional change.
This commit is contained in:
Krystian Kuzniarek
2020-12-31 17:00:39 +01:00
committed by Joost VandeVondele
parent 77eeea407c
commit 329ef2a6aa
2 changed files with 2 additions and 1 deletions
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AUTHORS
+1
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@@ -100,6 +100,7 @@ Ken Takusagawa
kinderchocolate kinderchocolate
Kiran Panditrao (Krgp) Kiran Panditrao (Krgp)
Kojirion Kojirion
Krystian Kuzniarek (kuzkry)
Leonardo Ljubičić (ICCF World Champion) Leonardo Ljubičić (ICCF World Champion)
Leonid Pechenik (lp--) Leonid Pechenik (lp--)
Linus Arver (listx) Linus Arver (listx)
src/syzygy/tbprobe.cpp
+1 -1
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@@ -1141,7 +1141,7 @@ void* mapped(TBTable<Type>& e, const Position& pos) {
if (e.ready.load(std::memory_order_acquire)) if (e.ready.load(std::memory_order_acquire))
return e.baseAddress; // Could be nullptr if file does not exist return e.baseAddress; // Could be nullptr if file does not exist
std::unique_lock<std::mutex> lk(mutex); std::scoped_lock<std::mutex> lk(mutex);
if (e.ready.load(std::memory_order_relaxed)) // Recheck under lock if (e.ready.load(std::memory_order_relaxed)) // Recheck under lock
return e.baseAddress; return e.baseAddress;