AtomiX.cpp

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#include "AtomiX.h"
 
namespace bux {
 
//
//      Implement Classes
//
C_SpinLock::C_SpinLock(std::atomic_flag &lock_): m_lock(&lock_)
{
    while (lock_.test_and_set(std::memory_order_acquire))  // acquire lock
#ifdef __cpp_lib_atomic_flag_test
        // Since C++20, it is possible to update atomic_flag's
        // value only when there is a chance to acquire the lock.
        // See also: https://stackoverflow.com/questions/62318642
        while (lock_.test(std::memory_order_relaxed))     // test lock
#endif
            ; // spin
}
 
void C_SpinLock::unlock()
{
    if (m_lock)
    {
        m_lock->clear(std::memory_order_release); // release lock
        m_lock = nullptr;
    }
}
 
} // namespace bux