Re: Some interesting results from tweaking spinlocks

mlw wrote:
[snip]
#define SPINS_PER_DELAY 2000
#define DELAY_MSEC 10
#define TIMEOUT_MSEC (60 * 1000)

ATOMIC_INC(lock->waiters);

while (TAS(lock))
{
if ( (++spins > SPINS_PER_DELAY) || (lock->waiters >= CPUS) )
{
if (++delays > (TIMEOUT_MSEC / DELAY_MSEC))
s_lock_stuck(lock, file, line);

delay.tv_sec = 0;
delay.tv_usec = DELAY_MSEC * 1000;
(void) select(0, NULL, NULL, NULL, &delay);

spins = 0;
}
}
ATOMIC_DEC(lock->waiters);

This is better function, the one in my previous post was non-sense, I should
have coffee BEFORE I post.