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[SYCL] Optimize ZeCache #7882

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Dec 29, 2022
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9 changes: 2 additions & 7 deletions sycl/plugins/unified_runtime/ur/ur.hpp
Original file line number Diff line number Diff line change
Expand Up @@ -115,18 +115,13 @@ template <class T> struct ZeCache : private T {
//
using InitFunctionType = std::function<void(T &)>;
InitFunctionType Compute{nullptr};
bool Computed{false};
pi_mutex ZeCacheMutex;
std::once_flag Computed;

ZeCache() : T{} {}

// Access to the fields of the original T data structure.
T *operator->() {
std::unique_lock<pi_mutex> Lock(ZeCacheMutex);
if (!Computed) {
Compute(*this);
Computed = true;
}
std::call_once(Computed, Compute, static_cast<T&>(*this));
return this;
}
};
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