97 lines
2.2 KiB
C
97 lines
2.2 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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const int batchSize = 50; // Check with SHARED_SPACE_SIZE
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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->ctrl.read = 0;
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channel->ctrl.write = 0;
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channel->cons.localWrite = 0;
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channel->cons.nextRead = 0;
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channel->cons.rBatch = 0;
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channel->prod.localRead = 0;
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channel->prod.nextWrite = 0;
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channel->prod.wBatch = 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 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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while (1)
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{
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if (channel->cons.nextRead == channel->cons.localWrite)
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{
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if (channel->cons.nextRead == channel->ctrl.write)
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continue;
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channel->cons.localWrite = channel->ctrl.write;
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}
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result = channel->shared_space[channel->cons.nextRead];
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channel->cons.nextRead = (channel->cons.nextRead + 1) % SHARED_SPACE_VOIDPTR;
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channel->cons.rBatch++;
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if (channel->cons.rBatch >= batchSize)
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{
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channel->ctrl.read = channel->cons.nextRead;
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channel->cons.rBatch = 0;
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}
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break;
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}
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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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int n;
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for(n = 0; n < count; n++)
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{
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if (channel->cons.nextRead == channel->cons.localWrite)
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{
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if (channel->cons.nextRead == channel->ctrl.write)
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break;
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channel->cons.localWrite = channel->ctrl.write;
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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[channel->cons.nextRead];
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channel->cons.nextRead = (channel->cons.nextRead + 1) % SHARED_SPACE_VOIDPTR;
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channel->cons.rBatch++;
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if (channel->cons.rBatch >= batchSize)
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{
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channel->ctrl.read = channel->cons.nextRead;
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channel->cons.rBatch = 0;
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}
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}
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return n;
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}
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