120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2010-2012 Thomas Preud'homme <thomas.preud-homme@lip6.fr>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <pthread.h>
|
|
#include <unistd.h>
|
|
|
|
/* Non standard include */
|
|
#include <commtech.h>
|
|
#include <specific_comm.h>
|
|
|
|
|
|
const unsigned int batchSize = 64; // Check with SHARED_SPACE_SIZE
|
|
|
|
void *create_comm_channel(void)
|
|
{
|
|
struct channel *channel;
|
|
|
|
if (!posix_memalign((void *) &channel, CACHE_LINE_SIZE, sizeof(struct channel)))
|
|
{
|
|
if (!posix_memalign((void *) &channel->shared_space, CACHE_LINE_SIZE, SHARED_SPACE_SIZE))
|
|
{
|
|
channel->ctrl.read = 0;
|
|
channel->ctrl.write = 0;
|
|
channel->cons.localWrite = 0;
|
|
channel->cons.nextRead = 0;
|
|
channel->cons.rBatch = 0;
|
|
channel->prod.localRead = 0;
|
|
channel->prod.nextWrite = 0;
|
|
channel->prod.wBatch = 0;
|
|
return channel;
|
|
}
|
|
else
|
|
free(channel);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int end_producer(void *unused __attribute__ ((unused)))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int destroy_comm_channel(void *channel)
|
|
{
|
|
free((void *) ((struct channel *) channel)->shared_space);
|
|
free(channel);
|
|
return 0;
|
|
}
|
|
|
|
void *recv_one_data(struct channel *channel)
|
|
{
|
|
void *result;
|
|
|
|
while (1)
|
|
{
|
|
if (channel->cons.nextRead == channel->cons.localWrite)
|
|
{
|
|
if (channel->cons.nextRead == channel->ctrl.write)
|
|
continue;
|
|
channel->cons.localWrite = channel->ctrl.write;
|
|
}
|
|
result = channel->shared_space[channel->cons.nextRead];
|
|
channel->cons.nextRead = (channel->cons.nextRead + 1) % SHARED_SPACE_VOIDPTR;
|
|
channel->cons.rBatch++;
|
|
if (channel->cons.rBatch >= batchSize)
|
|
{
|
|
channel->ctrl.read = channel->cons.nextRead;
|
|
channel->cons.rBatch = 0;
|
|
}
|
|
break;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
ssize_t recv_some_data(struct channel *channel, void **buf, size_t count)
|
|
{
|
|
unsigned int n;
|
|
|
|
for(n = 0; n < count; n++)
|
|
{
|
|
if (channel->cons.nextRead == channel->cons.localWrite)
|
|
{
|
|
if (channel->cons.nextRead == channel->ctrl.write)
|
|
break;
|
|
channel->cons.localWrite = channel->ctrl.write;
|
|
}
|
|
|
|
*buf++ = channel->shared_space[channel->cons.nextRead];
|
|
channel->cons.nextRead = (channel->cons.nextRead + 1) % SHARED_SPACE_VOIDPTR;
|
|
channel->cons.rBatch++;
|
|
if (channel->cons.rBatch >= batchSize)
|
|
{
|
|
channel->ctrl.read = channel->cons.nextRead;
|
|
channel->cons.rBatch = 0;
|
|
}
|
|
}
|
|
return n;
|
|
}
|