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Use a consistent snapshot of the lock state in owner_mtx().

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MFC after:	2 weeks
This commit is contained in:
Mark Johnston 2016-12-10 02:59:34 +00:00
parent c365a2934e
commit 02315a6759
1 changed files with 6 additions and 3 deletions
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9
sys/kern/kern_mutex.c
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@ -249,10 +249,13 @@ unlock_spin(struct lock_object *lock)
int
owner_mtx(const struct lock_object *lock, struct thread **owner)
{
const struct mtx *m = (const struct mtx *)lock;
const struct mtx *m;
uintptr_t x;
*owner = mtx_owner(m);
return (mtx_unowned(m) == 0);
m = (const struct mtx *)lock;
x = m->mtx_lock;
*owner = (struct thread *)(x & ~MTX_FLAGMASK);
return (x != MTX_UNOWNED);
}
#endif