109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/*
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* Copyright (C) 2009-2012 Thomas Preud'homme <thomas.preud-homme@lip6.fr>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <unistd.h>
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/* Non standard include */
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#include <commtech.h>
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#include <specific_comm.h>
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void *create_comm_channel(void)
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{
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struct channel *channel;
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if (!posix_memalign((void *) &channel, CACHE_LINE_SIZE, sizeof(struct channel)))
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{
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if (!posix_memalign((void *) &channel->shared_space, CACHE_LINE_SIZE, SHARED_SPACE_SIZE))
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{
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channel->cons_idx = 0;
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channel->prod_idx = 0;
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return channel;
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}
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else
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free(channel);
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}
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return NULL;
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}
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int end_producer(void *unused __attribute__ ((unused)))
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{
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return 0;
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}
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int destroy_comm_channel(void *channel)
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{
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free((void *) ((struct channel *) channel)->shared_space);
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free(channel);
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return 0;
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}
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void *recv_one_data(struct channel *channel)
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{
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void *result;
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unsigned int cons_idx, prod_idx;
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cons_idx = channel->cons_idx;
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prod_idx = channel->prod_idx;
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if (cons_idx == prod_idx)
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while(prod_idx == channel->prod_idx);
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/*
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* The behaviour of this is not documented but we know the
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* values inside shared_space won't change during this
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* affectation
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*/
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result = channel->shared_space[cons_idx];
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cons_idx = (cons_idx + 1) % SHARED_SPACE_VOIDPTR;
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channel->cons_idx = cons_idx;
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return result;
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}
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ssize_t recv_some_data(struct channel *channel, void **buf, size_t count)
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{
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unsigned int n, cons_idx, prod_idx;
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n = 0;
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cons_idx = channel->cons_idx;
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do
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{
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prod_idx = channel->prod_idx;
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for(; cons_idx != prod_idx; cons_idx = (cons_idx + 1) % SHARED_SPACE_VOIDPTR)
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{
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/*
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* The behaviour of this is not documented but we know
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* the values inside buf won't change during this affectation
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*/
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*buf++ = channel->shared_space[cons_idx];
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if (++n == count)
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{
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channel->cons_idx = cons_idx;
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return n;
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}
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}
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} while (prod_idx != channel->prod_idx);
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channel->cons_idx = cons_idx;
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return n;
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}
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