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78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/*
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* Copyright 2015 Stefan Lankes, RWTH Aachen University
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* All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2 (https://www.gnu.org/licenses/gpl-2.0.txt)
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* or the BSD license below:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __ISLELOCK_H__
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#define __ISLELOCK_H__
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#include <hermit/stddef.h>
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#include <asm/atomic.h>
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typedef struct islelock {
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/// Internal queue
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atomic_int32_t queue;
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/// Internal dequeue
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atomic_int32_t dequeue;
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} islelock_t;
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inline static int islelock_init(islelock_t* s)
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{
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atomic_int32_set(&s->queue, 0);
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atomic_int32_set(&s->dequeue, 1);
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return 0;
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}
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inline static int islelock_destroy(islelock_t* s)
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{
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return 0;
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}
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static inline int islelock_lock(islelock_t* s)
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{
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int ticket;
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ticket = atomic_int32_inc(&s->queue);
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while(atomic_int32_read(&s->dequeue) != ticket) {
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PAUSE;
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}
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return 0;
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}
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static inline int islelock_unlock(islelock_t* s)
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{
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atomic_int32_inc(&s->dequeue);
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return 0;
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}
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#endif
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