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#pragma once
#include <util/system/tls.h>
#include <util/generic/singleton.h>
#include <util/generic/ptr.h>
namespace NPrivate {
template <class T, size_t Priority>
struct TFastThreadSingletonHelper {
static inline T* GetSlow() {
return SingletonWithPriority<NTls::TValue<T>, Priority>()->GetPtr();
}
static inline T* Get() {
#if defined(Y_HAVE_FAST_POD_TLS)
Y_POD_STATIC_THREAD(T*) fast(nullptr);
if (Y_UNLIKELY(!fast)) {
fast = GetSlow();
}
return fast;
#else
return GetSlow();
#endif
}
};
}
template <class T, size_t Priority>
Y_RETURNS_NONNULL static inline T* FastTlsSingletonWithPriority() {
return ::NPrivate::TFastThreadSingletonHelper<T, Priority>::Get();
}
// NB: the singleton is the same for all modules that use
// FastTlsSingleton with the same type parameter. If unique singleton
// required, use unique types.
template <class T>
Y_RETURNS_NONNULL static inline T* FastTlsSingleton() {
return FastTlsSingletonWithPriority<T, TSingletonTraits<T>::Priority>();
}
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