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142 lines
4.6 KiB
C
142 lines
4.6 KiB
C
/* $Id: token.c,v 1.1 2008/09/24 22:40:30 fredette Exp $ */
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/* libtme/token.c - token functions: */
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/*
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* Copyright (c) 2008 Matt Fredette
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* All rights reserved.
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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
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* are met:
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* 1. 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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* 2. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Matt Fredette.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* 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 AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <tme/common.h>
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_TME_RCSID("$Id: token.c,v 1.1 2008/09/24 22:40:30 fredette Exp $");
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/* includes: */
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#include <tme/token.h>
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/* this initializes a token: */
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void
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tme_token_init(struct tme_token *token)
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{
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/* a constructed token is invalid: */
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tme_memory_atomic_init_flag(&token->tme_token_invalid, TRUE);
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#if !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS)
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/* a constructed token is not busy: */
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tme_memory_atomic_init_flag(&token->tme_token_busy, FALSE);
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/* initialize the token's invalid mutex: */
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tme_mutex_init(&token->tme_token_invalid_mutex);
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#ifndef TME_NO_DEBUG_LOCKS
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/* initialize the file and line number of the last busier or
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unbusier: */
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token->_tme_token_busy_file = NULL;
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token->_tme_token_busy_line = 0;
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#endif /* !TME_NO_DEBUG_LOCKS */
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#endif /* !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS) */
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}
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/* this invalidates a token: */
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void
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tme_token_invalidate(struct tme_token *token)
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{
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#if !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS)
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/* lock the token's invalid mutex: */
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tme_mutex_lock(&token->tme_token_invalid_mutex);
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#endif /* !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS) */
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/* invalidate the token: */
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tme_memory_atomic_write_flag(&token->tme_token_invalid, TRUE);
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#if TME_THREADS_COOPERATIVE
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#ifndef TME_NO_DEBUG_LOCKS
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/* this token must not be busy: */
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assert (!tme_memory_atomic_read_flag(&token->tme_token_busy));
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#endif /* !TME_NO_DEBUG_LOCKS */
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#else /* !TME_THREADS_COOPERATIVE */
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/* spin while the token is busy: */
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do { } while(tme_memory_atomic_read_flag(&token->tme_token_busy));
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#endif /* !TME_THREADS_COOPERATIVE */
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#if !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS)
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/* unlock the token's invalid mutex: */
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tme_mutex_unlock(&token->tme_token_invalid_mutex);
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#endif /* !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS) */
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}
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/* this clears an invalid token: */
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#undef tme_token_invalid_clear
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void
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tme_token_invalid_clear(struct tme_token *token)
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{
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#if !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS)
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/* the token must not be busy: */
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assert (!tme_memory_atomic_read_flag(&token->tme_token_busy));
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#endif /* !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS) */
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/* if the token is valid, return now: */
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if (__tme_predict_false(!tme_memory_atomic_read_flag(&(token)->tme_token_invalid))) {
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return;
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}
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#if !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS)
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/* lock the token's invalid mutex: */
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tme_mutex_lock(&token->tme_token_invalid_mutex);
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#endif /* !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS) */
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/* mark the token as valid again: */
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tme_memory_atomic_write_flag(&token->tme_token_invalid, FALSE);
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#if !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS)
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/* unlock the token's invalid mutex: */
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tme_mutex_unlock(&token->tme_token_invalid_mutex);
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#endif /* !TME_THREADS_COOPERATIVE || !defined(TME_NO_DEBUG_LOCKS) */
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}
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