#include <rst/termsec.h> // for user-defined resource sections
#include <atomic>

struct SpinLock {
    void lock() {
        { // define an explicit scope
            termsec::CheckWait check( &_flag );
            while ( _flag.test_and_set() ) { }
        } // end of scope
        termsec_begin_exclusive( &_flag );
    }

    void unlock() {
        termsec_end_exclusive( &_flag );
        _flag.clear();
    }

  private:
    std::atomic_flag _flag = ATOMIC_FLAG_INIT;
};

int main() {
SpinLock sl;
sl.lock();
while ( 1 ) { }
}