On Tue, 5 Jun 2007, John Baldwin wrote:
On Tuesday 05 June 2007 02:57:09 pm Attilio Rao wrote:
attilio 2007-06-05 18:57:09 UTC
FreeBSD src repository
Modified files:
sys/kern kern_mutex.c
Log:
Fix a problem with not-preemptive kernels caming from mis-merging of
existing code with the new thread_lock patch.
This also cleans up a bit unlock operation for mutexes.
Approved by: jhb, jeff(mentor)
Specifically, this retires the explicit preemption code in mtx_unlock()
(inherited from BSD/OS) in the #ifndef PREEMPTION case. We now only do
preemptions as a scheduling decision in the scheduler and only
#ifdef PREEMPTION.
I believe we also should replace thread_lock() and thread_unlock() with
calls to spinlock_enter()/exit() on !SMP and make thread_set_lock() a
no-op for this case. Does that sounds right to everyone?
Thanks,
Jeff
--
John Baldwin
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