On 04-Jul-2002 David Xu wrote:
> while we are getting rid of Giant,  current race condition between softclock()
> and callout_stop() is unacceptable. the race causes two many places in source
> code would be modified to fit this new behaviour,  besides this, everywhere 
> callout_stop() is used need to hold sched_lock and do a mi_switch() and
> modify td_flags is also unacceptable, this SMP race should be resolved in 
> kern_timeout.c.

How would you resolve it while still preserving the existing semantics?
Saying "this race should be resolved" doesn't explain how you would go about
resolving it.  It's a lot harder than it looks.


John Baldwin <[EMAIL PROTECTED]>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/

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