KK
Size: a a a
KK
IL
IL
CD
std::atomic<Singleton*> Singleton::m_instance;
std::mutex Singleton::m_mutex;
Singleton* Singleton::getInstance() {
Singleton* tmp = m_instance.load(std::memory_order_acquire);
if (tmp == nullptr) {
std::lock_guard<std::mutex> lock(m_mutex);
tmp = m_instance.load(std::memory_order_relaxed);
if (tmp == nullptr) {
tmp = new Singleton;
m_instance.store(tmp, std::memory_order_release);
}
}
return tmp;
}
CD
KK
IL
KK
KK
KK
KK
m
m
KK
CC
std::atomic<Singleton*> Singleton::m_instance;
std::mutex Singleton::m_mutex;
Singleton* Singleton::getInstance() {
Singleton* tmp = m_instance.load(std::memory_order_acquire);
if (tmp == nullptr) {
std::lock_guard<std::mutex> lock(m_mutex);
tmp = m_instance.load(std::memory_order_relaxed);
if (tmp == nullptr) {
tmp = new Singleton;
m_instance.store(tmp, std::memory_order_release);
}
}
return tmp;
}
KK
CC
CC
CC
CC