132 lines
2.4 KiB
C
132 lines
2.4 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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__thread struct comm *comm;
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const int batchSize = BUF_SIZE / sizeof(void *);
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int init_library(void)
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{
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return 0;
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}
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int finalize_library(void)
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{
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return 0;
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}
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void *create_comm_channel(void)
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{
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struct comm *comm;
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if (!posix_memalign((void *) &comm, CACHE_LINE_SIZE, sizeof(struct comm)))
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{
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if (!posix_memalign((void *) &comm->shared_space, CACHE_LINE_SIZE, SHARED_SPACE_SIZE))
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{
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comm->ctrl.read = 0;
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comm->ctrl.write = 0;
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comm->cons.localWrite = 0;
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comm->cons.nextRead = 0;
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comm->cons.rBatch = 0;
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comm->prod.localRead = 0;
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comm->prod.nextWrite = 0;
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comm->prod.wBatch = 0;
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return comm;
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}
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else
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free(comm);
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}
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return NULL;
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}
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int destroy_comm_channel(void *comm)
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{
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free((void *) ((struct comm *) comm)->shared_space);
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free(comm);
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return 0;
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}
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int init_producer_thread(void *comm_param)
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{
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comm = (struct comm *) comm_param;
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return 0;
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}
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int finalize_producer_thread(void *unused)
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{
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comm = NULL;
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return 0;
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}
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int init_consumer_thread(void *comm_param)
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{
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comm = (struct comm *) comm_param;
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return 0;
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}
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int finalize_consumer_thread(void *unused)
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{
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comm = NULL;
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return 0;
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}
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void *recv_one_data(void)
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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 (comm->cons.nextRead == comm->cons.localWrite)
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{
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if (comm->cons.nextRead == comm->ctrl.write)
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continue;
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comm->cons.localWrite = comm->ctrl.write;
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}
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result = (void *) comm->shared_space[comm->cons.nextRead];
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comm->cons.nextRead = (comm->cons.nextRead + 1) % SHARED_SPACE_VOIDPTR;
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comm->cons.rBatch++;
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if (comm->cons.rBatch >= batchSize)
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{
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comm->ctrl.read = comm->cons.nextRead;
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comm->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(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 (comm->cons.nextRead == comm->cons.localWrite)
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{
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if (comm->cons.nextRead == comm->ctrl.write)
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break;
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comm->cons.localWrite = comm->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++ = (void *) comm->shared_space[comm->cons.nextRead];
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comm->cons.nextRead = (comm->cons.nextRead + 1) % SHARED_SPACE_VOIDPTR;
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comm->cons.rBatch++;
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if (comm->cons.rBatch >= batchSize)
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{
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comm->ctrl.read = comm->cons.nextRead;
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comm->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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