/*
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* Copyright (C) 2001-2013 Philippe Gerum <rpm@xenomai.org>.
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* Copyright (C) 2008, 2009 Jan Kiszka <jan.kiszka@siemens.com>.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#ifndef _COBALT_UAPI_KERNEL_SYNCH_H
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#define _COBALT_UAPI_KERNEL_SYNCH_H
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#include <cobalt/uapi/kernel/types.h>
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/* Creation flags */
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#define XNSYNCH_FIFO 0x0
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#define XNSYNCH_PRIO 0x1
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#define XNSYNCH_PI 0x2
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#define XNSYNCH_DREORD 0x4
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#define XNSYNCH_OWNER 0x8
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#define XNSYNCH_PP 0x10
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/* Fast lock API */
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static inline int xnsynch_fast_is_claimed(xnhandle_t handle)
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{
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return (handle & XNSYNCH_FLCLAIM) != 0;
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}
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static inline xnhandle_t xnsynch_fast_claimed(xnhandle_t handle)
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{
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return handle | XNSYNCH_FLCLAIM;
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}
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static inline xnhandle_t xnsynch_fast_ceiling(xnhandle_t handle)
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{
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return handle | XNSYNCH_FLCEIL;
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}
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static inline int
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xnsynch_fast_owner_check(atomic_t *fastlock, xnhandle_t ownerh)
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{
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return (xnhandle_get_id((xnhandle_t)atomic_read(fastlock)) == ownerh) ?
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0 : -EPERM;
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}
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static inline
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int xnsynch_fast_acquire(atomic_t *fastlock, xnhandle_t new_ownerh)
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{
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xnhandle_t h;
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h = (xnhandle_t)atomic_cmpxchg(fastlock, XN_NO_HANDLE, new_ownerh);
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if (h != XN_NO_HANDLE) {
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if (xnhandle_get_id(h) == new_ownerh)
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return -EBUSY;
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return -EAGAIN;
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}
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return 0;
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}
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static inline
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int xnsynch_fast_release(atomic_t *fastlock, xnhandle_t cur_ownerh)
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{
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return (xnhandle_t)atomic_cmpxchg(fastlock, cur_ownerh, XN_NO_HANDLE)
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== cur_ownerh;
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}
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/* Local/shared property */
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static inline int xnsynch_is_shared(xnhandle_t handle)
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{
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return (handle & XNSYNCH_PSHARED) != 0;
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}
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#endif /* !_COBALT_UAPI_KERNEL_SYNCH_H */
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