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Make sure we get new m_owner value if we can not unlock it in

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uncontested case. Reorder statements in do_unlock_umutex.
This commit is contained in:
David Xu 2006-09-02 02:41:33 +00:00
parent ee35caa0b3
commit 81273e0632
1 changed files with 12 additions and 8 deletions
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20
sys/kern/kern_umtx.c
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@ -681,6 +681,7 @@ do_unlock(struct thread *td, struct umtx *umtx, uintptr_t id)
return (EFAULT);
if (old == owner)
return (0);
owner = old;
}
/* We should only ever be in here for contested locks */
@ -965,6 +966,7 @@ do_unlock_normal(struct thread *td, struct umutex *m, uint32_t flags)
return (EFAULT);
if (old == owner)
return (0);
owner = old;
}
/* We should only ever be in here for contested locks */
@ -1595,6 +1597,7 @@ do_unlock_pi(struct thread *td, struct umutex *m, uint32_t flags)
return (EFAULT);
if (old == owner)
return (0);
owner = old;
}
/* We should only ever be in here for contested locks */
@ -2005,20 +2008,21 @@ static int
do_unlock_umutex(struct thread *td, struct umutex *m)
{
uint32_t flags;
int ret;
flags = fuword32(&m->m_flags);
if (flags == -1)
return (EFAULT);
if ((flags & UMUTEX_PRIO_INHERIT) != 0)
ret = do_unlock_pi(td, m, flags);
else if ((flags & UMUTEX_PRIO_PROTECT) != 0)
ret = do_unlock_pp(td, m, flags);
else
ret = do_unlock_normal(td, m, flags);
switch(flags & (UMUTEX_PRIO_INHERIT | UMUTEX_PRIO_PROTECT)) {
case 0:
return (do_unlock_normal(td, m, flags));
case UMUTEX_PRIO_INHERIT:
return (do_unlock_pi(td, m, flags));
case UMUTEX_PRIO_PROTECT:
return (do_unlock_pp(td, m, flags));
}
return (ret);
return (EINVAL);
}
int