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/* $OpenBSD: lock.h,v 1.9 2015/02/11 03:56:00 dlg Exp $ */
/* $NetBSD: lock.h,v 1.16 2001/12/17 23:34:57 thorpej Exp $ */
/*-
* Copyright (c) 1998, 1999, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Machine-dependent spin lock operations.
*/
#ifndef _MACHINE_LOCK_H_
#define _MACHINE_LOCK_H_
#if defined(MULTIPROCESSOR)
/*
* On the Alpha, interprocessor interrupts come in at device priority
* level. This can cause some problems while waiting for r/w spinlocks
* from a high'ish priority level: IPIs that come in will not be processed.
* This can lead to deadlock.
*
* This hook allows IPIs to be processed while a spinlock's interlock
* is released.
*/
#define SPINLOCK_SPIN_HOOK \
do { \
struct cpu_info *__ci = curcpu(); \
int __s; \
\
if (__ci->ci_ipis != 0) { \
__s = splipi(); \
alpha_ipi_process_with_frame(__ci); \
splx(__s); \
} \
} while (0)
#endif /* MULTIPROCESSOR */
#endif /* _MACHINE_LOCK_H_ */
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