115 lines
1.9 KiB
C
115 lines
1.9 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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__thread union ctrl ctrl __attribute__ ((aligned (CACHE_LINE_SIZE)));
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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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int i;
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for (i = 0; i < SLOTS; i++)
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comm->queue[i].flag = 0;
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return 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(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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ctrl.tail = 0;
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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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ctrl.tail = 0;
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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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ctrl.head = 0;
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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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ctrl.head = 0;
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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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static __thread int i;
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void *result;
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if (__builtin_expect(!i, 0))
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while (!comm->queue[ctrl.head].flag);
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result = (void *) comm->queue[ctrl.head].chunk[i++];
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if (i % SUB_SLOTS)
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{
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i = 0;
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comm->queue[ctrl.head].flag = 0;
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ctrl.head = (ctrl.head + 1) % SLOTS;
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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 i, n;
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n = 0;
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// If all slots are empty, spin
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while (comm->queue[ctrl.head].flag)
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{
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// Dequeue a chunk of data items
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for (i = 0; i < SUB_SLOTS; i++)
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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->queue[ctrl.head].chunk[i];
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}
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n += SUB_SLOTS;
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comm->queue[ctrl.head].flag = 0;
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ctrl.head = (ctrl.head + 1) % SLOTS;
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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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