NetBSD/sys/netsmb/smb_lock.c

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/* $NetBSD: smb_lock.c,v 1.1 2000/12/07 03:48:10 deberg Exp $ */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <netsmb/smb_lock.h>
int
simple_spinlock_init(struct simplespinlock *slp, char *name, int prio)
{
bzero(slp, sizeof(*slp));
simple_lock_init(&slp->sl_interlock);
slp->sl_name = name;
prio = prio;
return 0;
}
int
simple_spinlock(struct simplespinlock *slp, int intr)
{
int flags = slp->sl_prio;
int error;
if (intr)
flags |= PCATCH;
try_again:
simple_lock(&slp->sl_interlock);
if (++slp->sl_count == 1) {
simple_unlock(&slp->sl_interlock);
return 0;
}
#ifndef NetBSD
asleep(&slp->sl_count, flags, slp->sl_name, 0);
simple_unlock(&slp->sl_interlock);
error = await(flags, 0);
#else
simple_unlock(&slp->sl_interlock);
error = tsleep(&slp->sl_count, flags, slp->sl_name, 0);
#endif
if (error) {
simple_lock(&slp->sl_interlock);
slp->sl_count--;
simple_unlock(&slp->sl_interlock);
if (error == ERESTART)
error = EINTR;
}
#ifdef NetBSD
else
goto try_again;
#endif
return error;
}
void
simple_spinunlock(struct simplespinlock *slp)
{
simple_lock(&slp->sl_interlock);
if (slp->sl_count == 0)
panic("spinunlock(): negative lock count\n");
#ifndef NetBSD
if (--slp->sl_count != 0)
wakeup_one(&slp->sl_count);
simple_unlock(&slp->sl_interlock);
#else
--slp->sl_count;
simple_unlock(&slp->sl_interlock);
if (slp->sl_count != 0)
wakeup(&slp->sl_count);
#endif
return;
}