svn commit: r192604 - in user/kmacy/releng_7_2_fcs/sys: dev/hwpmc sys

Kip Macy kmacy at
Tue May 26 18:18:03 UTC 2009

On Tue, May 26, 2009 at 5:30 AM, John Baldwin <jhb at> wrote:
> On Friday 22 May 2009 5:45:43 pm Kip Macy wrote:
>> Author: kmacy
>> Date: Fri May 22 21:45:43 2009
>> New Revision: 192604
>> URL:
>> Log:
>>   - remove pmc_kthread_mtx
>>   - replace sleep/wakeup on kthread with a condvar
> If you do not sleep on the kthread/kproc when waiting for a kthread to
> exit, then you open up a race window.  Usually this matters more for
> any kthreads that live in a module since the race allows the module to
> be unmapped before the thread is finished executing code from the module
> resulting in a fatal page fault in the kernel.

Yes, that is why the kthread explicitly calls cv_signal after clearing
the kthread pointer.


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