71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
#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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unsigned int cons_idx;
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void *result;
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cons_idx = channel->cons_idx;
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while (cons_idx == channel->prod_idx);
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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;
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n = 0;
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for(cons_idx = channel->cons_idx; cons_idx != channel->prod_idx; cons_idx = (cons_idx + 1) % SHARED_SPACE_VOIDPTR, channel->cons_idx = cons_idx)
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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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break;
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}
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return n;
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}
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