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#include "tls.h"
#include <util/generic/hash.h>
#include <util/generic/intrlist.h>
#include <util/generic/singleton.h>
#include <util/generic/vector.h>
#include <atomic>
#if defined(_unix_)
#include <pthread.h>
#endif
using namespace NTls;
namespace {
static inline size_t AcquireKey() {
static std::atomic<size_t> cur;
return cur++;
}
class TGenericTlsBase {
public:
using TSmallKey = size_t;
class TPerThreadStorage {
public:
struct TKey: public TNonCopyable {
inline TKey(TDtor dtor)
: Key(AcquireKey())
, Dtor(dtor)
{
}
TSmallKey Key;
TDtor Dtor;
};
class TStoredValue: public TIntrusiveListItem<TStoredValue> {
public:
inline TStoredValue(const TKey* key)
: Data_(nullptr)
, Dtor_(key->Dtor)
{
}
inline ~TStoredValue() {
if (Dtor_ && Data_) {
Dtor_(Data_);
}
}
inline void Set(void* ptr) noexcept {
Data_ = ptr;
}
inline void* Get() const noexcept {
return Data_;
}
private:
void* Data_;
TDtor Dtor_;
};
inline TStoredValue* Value(const TKey* key) {
TStoredValue*& ret = *ValuePtr((size_t)key->Key);
if (!ret) {
THolder<TStoredValue> sv(new TStoredValue(key));
Storage_.PushFront(sv.Get());
ret = sv.Release();
}
return ret;
}
inline TStoredValue** ValuePtr(size_t idx) {
// do not grow vector too much
if (idx < 10000) {
if (idx >= Values_.size()) {
Values_.resize(idx + 1);
}
return &Values_[idx];
}
return &FarValues_[idx];
}
private:
TVector<TStoredValue*> Values_;
THashMap<size_t, TStoredValue*> FarValues_;
TIntrusiveListWithAutoDelete<TStoredValue, TDelete> Storage_;
};
inline TPerThreadStorage* MyStorage() {
#if defined(Y_HAVE_FAST_POD_TLS)
Y_POD_STATIC_THREAD(TPerThreadStorage*)
my(nullptr);
if (!my) {
my = MyStorageSlow();
}
return my;
#else
return MyStorageSlow();
#endif
}
virtual TPerThreadStorage* MyStorageSlow() = 0;
virtual ~TGenericTlsBase() = default;
};
} // namespace
#if defined(_unix_)
namespace {
class TMasterTls: public TGenericTlsBase {
public:
inline TMasterTls() {
Y_ABORT_UNLESS(!pthread_key_create(&Key_, Dtor), "pthread_key_create failed");
}
inline ~TMasterTls() override {
// explicitly call dtor for main thread
Dtor(pthread_getspecific(Key_));
Y_ABORT_UNLESS(!pthread_key_delete(Key_), "pthread_key_delete failed");
}
static inline TMasterTls* Instance() {
return SingletonWithPriority<TMasterTls, 1>();
}
private:
TPerThreadStorage* MyStorageSlow() override {
void* ret = pthread_getspecific(Key_);
if (!ret) {
ret = new TPerThreadStorage();
Y_ABORT_UNLESS(!pthread_setspecific(Key_, ret), "pthread_setspecific failed");
}
return (TPerThreadStorage*)ret;
}
static void Dtor(void* ptr) {
delete (TPerThreadStorage*)ptr;
}
private:
pthread_key_t Key_;
};
using TKeyDescriptor = TMasterTls::TPerThreadStorage::TKey;
} // namespace
class TKey::TImpl: public TKeyDescriptor {
public:
inline TImpl(TDtor dtor)
: TKeyDescriptor(dtor)
{
}
inline void* Get() const {
return TMasterTls::Instance()->MyStorage()->Value(this)->Get();
}
inline void Set(void* val) const {
TMasterTls::Instance()->MyStorage()->Value(this)->Set(val);
}
static inline void Cleanup() {
}
};
#else
namespace {
class TGenericTls: public TGenericTlsBase {
public:
virtual TPerThreadStorage* MyStorageSlow() {
auto lock = Guard(Lock_);
{
TPTSRef& ret = Datas_[TThread::CurrentThreadId()];
if (!ret) {
ret.Reset(new TPerThreadStorage());
}
return ret.Get();
}
}
inline void Cleanup() noexcept {
with_lock (Lock_) {
Datas_.erase(TThread::CurrentThreadId());
}
}
static inline TGenericTls* Instance() {
return SingletonWithPriority<TGenericTls, 1>();
}
private:
using TPTSRef = THolder<TPerThreadStorage>;
TMutex Lock_;
THashMap<TThread::TId, TPTSRef> Datas_;
};
} // namespace
class TKey::TImpl {
public:
inline TImpl(TDtor dtor)
: Key_(dtor)
{
}
inline void* Get() {
return TGenericTls::Instance()->MyStorage()->Value(&Key_)->Get();
}
inline void Set(void* ptr) {
TGenericTls::Instance()->MyStorage()->Value(&Key_)->Set(ptr);
}
static inline void Cleanup() {
TGenericTls::Instance()->Cleanup();
}
private:
TGenericTls::TPerThreadStorage::TKey Key_;
};
#endif
TKey::TKey(TDtor dtor)
: Impl_(new TImpl(dtor))
{
}
TKey::TKey(TKey&&) noexcept = default;
TKey::~TKey() = default;
void* TKey::Get() const {
return Impl_->Get();
}
void TKey::Set(void* ptr) const {
Impl_->Set(ptr);
}
void TKey::Cleanup() noexcept {
TImpl::Cleanup();
}
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