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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QTHREADSTORAGE_H
#define QTHREADSTORAGE_H
#include <QtCore/qglobal.h>
#if !QT_CONFIG(thread)
#include <memory>
#endif
QT_BEGIN_NAMESPACE
#if QT_CONFIG(thread)
template <bool ShouldWarn> struct QThreadStorageTraits
{
static constexpr void warnAboutTrivial() {}
};
template <> struct QThreadStorageTraits<true>
{
#ifndef Q_NO_THREAD_STORAGE_TRIVIAL_WARNING
Q_DECL_DEPRECATED_X("QThreadStorage used with a trivial non-pointer type; consider using thread_local")
#endif
static constexpr void warnAboutTrivial() noexcept {}
};
class Q_CORE_EXPORT QThreadStorageData
{
public:
explicit QThreadStorageData(void (*func)(void *));
~QThreadStorageData();
void** get() const;
void** set(void* p);
int id;
};
// pointer specialization
template <typename T>
inline
T *&qThreadStorage_localData(QThreadStorageData &d, T **)
{
void **v = d.get();
if (!v) v = d.set(nullptr);
return *(reinterpret_cast<T**>(v));
}
template <typename T>
inline
T *qThreadStorage_localData_const(const QThreadStorageData &d, T **)
{
void **v = d.get();
return v ? *(reinterpret_cast<T**>(v)) : 0;
}
template <typename T>
inline
void qThreadStorage_setLocalData(QThreadStorageData &d, T **t)
{ (void) d.set(*t); }
template <typename T>
inline
void qThreadStorage_deleteData(void *d, T **)
{ delete static_cast<T *>(d); }
// value-based specialization
template <typename T>
inline
T &qThreadStorage_localData(QThreadStorageData &d, T *)
{
void **v = d.get();
if (!v) v = d.set(new T());
return *(reinterpret_cast<T*>(*v));
}
template <typename T>
inline
T qThreadStorage_localData_const(const QThreadStorageData &d, T *)
{
void **v = d.get();
return v ? *(reinterpret_cast<T*>(*v)) : T();
}
template <typename T>
inline
void qThreadStorage_setLocalData(QThreadStorageData &d, T *t)
{ (void) d.set(new T(*t)); }
template <typename T>
inline
void qThreadStorage_deleteData(void *d, T *)
{ delete static_cast<T *>(d); }
template <class T>
class QThreadStorage
{
private:
using Trait = QThreadStorageTraits<std::is_trivially_default_constructible_v<T> &&
std::is_trivially_copyable_v<T> && !std::is_pointer_v<T>>;
QThreadStorageData d;
Q_DISABLE_COPY(QThreadStorage)
static inline void deleteData(void *x)
{ qThreadStorage_deleteData(x, reinterpret_cast<T*>(0)); }
public:
inline QThreadStorage() : d(deleteData) { Trait::warnAboutTrivial(); }
inline ~QThreadStorage() { }
inline bool hasLocalData() const
{ return d.get() != nullptr; }
inline T& localData()
{ return qThreadStorage_localData(d, reinterpret_cast<T*>(0)); }
inline T localData() const
{ return qThreadStorage_localData_const(d, reinterpret_cast<T*>(0)); }
inline void setLocalData(T t)
{ qThreadStorage_setLocalData(d, &t); }
};
#else // !QT_CONFIG(thread)
template <typename T, typename U>
inline bool qThreadStorage_hasLocalData(const std::unique_ptr<T, U> &data)
{
return !!data;
}
template <typename T, typename U>
inline bool qThreadStorage_hasLocalData(const std::unique_ptr<T*, U> &data)
{
return !!data ? *data != nullptr : false;
}
template <typename T>
inline void qThreadStorage_deleteLocalData(T *t)
{
delete t;
}
template <typename T>
inline void qThreadStorage_deleteLocalData(T **t)
{
delete *t;
delete t;
}
template <class T>
class QThreadStorage
{
private:
struct ScopedPointerThreadStorageDeleter
{
void operator()(T *t) const noexcept
{
if (t == nullptr)
return;
qThreadStorage_deleteLocalData(t);
}
};
std::unique_ptr<T, ScopedPointerThreadStorageDeleter> data;
public:
QThreadStorage() = default;
~QThreadStorage() = default;
QThreadStorage(const QThreadStorage &rhs) = delete;
QThreadStorage &operator=(const QThreadStorage &rhs) = delete;
inline bool hasLocalData() const
{
return qThreadStorage_hasLocalData(data);
}
inline T &localData()
{
if (!data)
data.reset(new T());
return *data;
}
inline T localData() const
{
return !!data ? *data : T();
}
inline void setLocalData(T t)
{
data.reset(new T(t));
}
};
#endif // QT_CONFIG(thread)
QT_END_NAMESPACE
#endif // QTHREADSTORAGE_H
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