On 11-Mar-2001 Dave Zarzycki wrote:
> On Mon, 12 Mar 2001, Anton Blanchard wrote:
>
>> Perhaps we need something like sched_yield that takes off some of
>> tsk->counter so the task with the spinlock will run earlier.
>
> Personally speaking, I wish sched_yield() API was like so:
>
> int sched_yield(pid_t pid);
Yes, You could do an API like this but it's not the mean of sched_yield().
> This would allow the thread wanting to acquire the spinlock to yield
> specifically to the thread holding the lock (assuming the pid of the lock
> holder was stored in the spinlock...) In fact, the the original lock owner
> could in theory yield back to the threading wanting to acquire the lock.
Everything happens inside a spinlock should be very fast otherwise the use of a
spinlock should be avoided.
- Davide
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