hr_clock_lock
s = hr_clock_lock();
int s = hr_clock_lock();
int spl = hr_clock_lock();
s = hr_clock_lock();
s = hr_clock_lock();
s = hr_clock_lock();
s = hr_clock_lock();
s = hr_clock_lock();
s = hr_clock_lock();
s = hr_clock_lock();
spl = hr_clock_lock();
extern int hr_clock_lock(void);
s = hr_clock_lock();
int s = hr_clock_lock();
s = hr_clock_lock();