68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 by Daniel Ankers
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "corelock.h"
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/* Core locks using Peterson's mutual exclusion algorithm. */
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#ifdef CPU_ARM
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#include "arm/corelock.c"
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#else
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void corelock_lock(struct corelock *cl)
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{
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const unsigned int core = CURRENT_CORE;
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const unsigned int othercore = 1 - core;
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cl->myl[core] = core;
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cl->turn = othercore;
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for (;;)
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{
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if (cl->myl[othercore] == 0 || cl->turn == core)
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break;
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}
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}
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int corelock_try_lock(struct corelock *cl)
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{
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const unsigned int core = CURRENT_CORE;
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const unsigned int othercore = 1 - core;
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cl->myl[core] = core;
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cl->turn = othercore;
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if (cl->myl[othercore] == 0 || cl->turn == core)
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{
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return 1;
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}
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cl->myl[core] = 0;
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return 0;
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}
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void corelock_unlock(struct corelock *cl)
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{
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cl->myl[CURRENT_CORE] = 0;
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}
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#endif
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