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#pragma once
#include "StarThread.hpp"
namespace Star {
// Thread safe shared_ptr such that is is possible to safely access the
// contents of the shared_ptr while other threads might be updating it. Makes
// it possible to safely do Read Copy Update.
template <typename T>
class AtomicSharedPtr {
public:
typedef shared_ptr<T> SharedPtr;
typedef weak_ptr<T> WeakPtr;
AtomicSharedPtr();
AtomicSharedPtr(AtomicSharedPtr const& p);
AtomicSharedPtr(AtomicSharedPtr&& p);
AtomicSharedPtr(SharedPtr p);
SharedPtr load() const;
WeakPtr weak() const;
void store(SharedPtr p);
void reset();
explicit operator bool() const;
bool unique() const;
SharedPtr operator->() const;
AtomicSharedPtr& operator=(AtomicSharedPtr const& p);
AtomicSharedPtr& operator=(AtomicSharedPtr&& p);
AtomicSharedPtr& operator=(SharedPtr p);
private:
SharedPtr m_ptr;
mutable SpinLock m_lock;
};
template <typename T>
AtomicSharedPtr<T>::AtomicSharedPtr() {}
template <typename T>
AtomicSharedPtr<T>::AtomicSharedPtr(AtomicSharedPtr const& p)
: m_ptr(p.load()) {}
template <typename T>
AtomicSharedPtr<T>::AtomicSharedPtr(AtomicSharedPtr&& p)
: m_ptr(std::move(p.m_ptr)) {}
template <typename T>
AtomicSharedPtr<T>::AtomicSharedPtr(SharedPtr p)
: m_ptr(std::move(p)) {}
template <typename T>
auto AtomicSharedPtr<T>::load() const -> SharedPtr {
SpinLocker locker(m_lock);
return m_ptr;
}
template <typename T>
auto AtomicSharedPtr<T>::weak() const -> WeakPtr {
SpinLocker locker(m_lock);
return WeakPtr(m_ptr);
}
template <typename T>
void AtomicSharedPtr<T>::store(SharedPtr p) {
SpinLocker locker(m_lock);
m_ptr = std::move(p);
}
template <typename T>
void AtomicSharedPtr<T>::reset() {
SpinLocker locker(m_lock);
m_ptr.reset();
}
template <typename T>
AtomicSharedPtr<T>::operator bool() const {
SpinLocker locker(m_lock);
return (bool)m_ptr;
}
template <typename T>
bool AtomicSharedPtr<T>::unique() const {
SpinLocker locker(m_lock);
return m_ptr.unique();
}
template <typename T>
auto AtomicSharedPtr<T>::operator-> () const -> SharedPtr {
SpinLocker locker(m_lock);
return m_ptr;
}
template <typename T>
AtomicSharedPtr<T>& AtomicSharedPtr<T>::operator=(AtomicSharedPtr const& p) {
SpinLocker locker(m_lock);
m_ptr = p.load();
return *this;
}
template <typename T>
AtomicSharedPtr<T>& AtomicSharedPtr<T>::operator=(AtomicSharedPtr&& p) {
SpinLocker locker(m_lock);
m_ptr = std::move(p.m_ptr);
return *this;
}
template <typename T>
AtomicSharedPtr<T>& AtomicSharedPtr<T>::operator=(SharedPtr p) {
SpinLocker locker(m_lock);
m_ptr = std::move(p);
return *this;
}
}
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