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From: John Baldwin <jhb@FreeBSD.org>
Subject: PERFORCE change 12066 for review
To: Perforce Change Reviews <perforce@freebsd.org>
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http://people.freebsd.org/~peter/p4db/chv.cgi?CH=12066

Change 12066 by jhb@jhb_laptop on 2002/05/29 07:28:41

	Spin w/o holding sched_lock until mtx_lock changes when we are
	adaptively spinning.

Affected files ...

... //depot/projects/smpng/sys/kern/kern_mutex.c#34 edit

Differences ...

==== //depot/projects/smpng/sys/kern/kern_mutex.c#34 (text+ko) ====

@@ -533,9 +533,11 @@
 		if (m != &Giant && owner->td_kse != NULL &&
 		    owner->td_kse->ke_oncpu != NOCPU) {
 			mtx_unlock_spin(&sched_lock);
+			while (mtx_owner(m) == owner) {
 #ifdef __i386__
-			cpu_pause();
+				cpu_pause();
 #endif
+			}
 			continue;
 		}
 #endif	/* SMP && ADAPTIVE_MUTEXES */

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