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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Monkey HTTP Server (Duda I/O)
* -----------------------------
* Copyright 2017 Eduardo Silva <eduardo@monkey.io>
* Copyright 2014, Zeying Xie <swpdtz at gmail dot com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <assert.h>
#include <mk_core/mk_memory.h>
#include <mk_core/mk_thread.h>
#include <mk_core/mk_thread_channel.h>
struct mk_thread_channel_elem {
void *data;
struct mk_list _head;
};
struct mk_thread_channel_elem *mk_thread_channel_elem_create(void *data)
{
struct mk_thread_channel_elem *elem;
elem = mk_mem_alloc(sizeof(*elem));
if (!elem) {
return NULL;
}
elem->data = data;
return elem;
}
static void mk_thread_channel_elem_free(struct mk_thread_channel_elem *elem)
{
assert(elem);
mk_list_del(&elem->_head);
mk_mem_free(elem);
}
/*
* @METHOD_NAME: chan_create
* @METHOD_DESC: create a channel(pipe) for dthread communication.
* @METHOD_PROTO: mk_thread_channel_t *chan_create(int size)
* @METHOD_PARAM: size the buffered size of the channel.
* @METHOD_RETURN: returns a new channel.
*/
struct mk_thread_channel *mk_thread_channel_create(int size)
{
struct mk_thread_channel *chan;
chan = mk_mem_alloc(sizeof(*chan));
if (!chan) {
return NULL;
}
chan->size = size + 1;
chan->used = 0;
mk_list_init(&chan->bufs);
chan->sender = -1;
chan->receiver = -1;
chan->ended = 0;
chan->done = 0;
return chan;
}
/*
* @METHOD_NAME: chan_free
* @METHOD_DESC: release a given channel.
* @METHOD_PROTO: void chan_free(mk_thread_channel_t *chan)
* @METHOD_PARAM: chan the target channel to be released.
* @METHOD_RETURN: this method do not return any value.
*/
void mk_thread_channel_free(struct mk_thread_channel *chan)
{
assert(chan);
if (chan->receiver != -1) {
mk_list_del(&chan->_head);
}
mk_mem_free(chan);
}
/*
* @METHOD_NAME: chan_send
* @METHOD_DESC: add a new element to the given channel.
* @METHOD_PROTO: int chan_send(mk_thread_channel_t *chan, void *data)
* @METHOD_PARAM: chan the target channel to send.
* @METHOD_PARAM: data the new element to be sent to channel.
* @METHOD_RETURN: return THREAD_CHANNEL_BROKEN if the other side of the pipe
* is closed, otherwise return THREAD_CHANNEL_OK.
*/
int mk_thread_channel_send(struct mk_thread_channel *chan, void *data)
{
struct mk_thread_channel_elem *elem;
assert(chan);
if (chan->receiver == -1) {
return MK_THREAD_CHANNEL_BROKEN;
}
if (chan->used == chan->size) {
// channel is full
mk_thread_resume(chan->receiver);
}
elem = mk_thread_channel_elem_create(data);
mk_list_add(&elem->_head, &chan->bufs);
chan->used++;
return MK_THREAD_CHANNEL_OK;
}
/*
* @METHOD_NAME: chan_recv
* @METHOD_DESC: remove an element from a given channel.
* @METHOD_PROTO: void *chan_recv(mk_thread_channel_t *chan)
* @METHOD_PARAM: chan the target channel to receive.
* @METHOD_RETURN: the front element of the channel.
*/
void *mk_thread_channel_recv(struct mk_thread_channel *chan)
{
void *data;
struct mk_thread_channel_elem *elem;
assert(chan);
assert(!chan->done);
if (chan->used == 0) {
/* channel is empty */
mk_thread_resume(chan->sender);
}
elem = mk_list_entry_first(&chan->bufs, struct mk_thread_channel_elem, _head);
data = elem->data;
mk_thread_channel_elem_free(elem);
chan->used--;
if (chan->used == 0 && chan->ended) {
chan->done = 1;
}
return data;
}
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