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#include <mbgl/util/uv-channel.h>
#include <mbgl/util/queue.h>
#include <stdlib.h>
// Taken from http://navaneeth.github.io/blog/2013/08/02/channels-in-libuv/
typedef struct {
void *data;
void *active_queue[2];
} uv__chan_item_t;
int uv_chan_init(uv_chan_t *chan) {
int r = uv_mutex_init(&chan->mutex);
if (r == -1)
return r;
QUEUE_INIT(&chan->q);
return uv_cond_init(&chan->cond);
}
void uv_chan_send(uv_chan_t *chan, void *data) {
uv__chan_item_t *item = (uv__chan_item_t *)malloc(sizeof(uv__chan_item_t));
item->data = data;
uv_mutex_lock(&chan->mutex);
QUEUE_INSERT_TAIL(&chan->q, &item->active_queue);
uv_cond_signal(&chan->cond);
uv_mutex_unlock(&chan->mutex);
}
void *uv_chan_receive(uv_chan_t *chan) {
uv__chan_item_t *item;
QUEUE *head;
void *data = NULL;
uv_mutex_lock(&chan->mutex);
while (QUEUE_EMPTY(&chan->q)) {
uv_cond_wait(&chan->cond, &chan->mutex);
}
head = QUEUE_HEAD(&chan->q);
item = QUEUE_DATA(head, uv__chan_item_t, active_queue);
data = item->data;
QUEUE_REMOVE(head);
free(item);
uv_mutex_unlock(&chan->mutex);
return data;
}
void uv_chan_clear(uv_chan_t *chan) {
uv_mutex_lock(&chan->mutex);
uv__chan_item_t *item = NULL;
QUEUE *head = NULL;
while (!QUEUE_EMPTY(&chan->q)) {
head = QUEUE_HEAD(&chan->q);
item = QUEUE_DATA(head, uv__chan_item_t, active_queue);
QUEUE_REMOVE(head);
free(item);
}
uv_mutex_unlock(&chan->mutex);
}
void uv_chan_destroy(uv_chan_t *chan) {
uv_chan_clear(chan);
uv_cond_destroy(&chan->cond);
uv_mutex_destroy(&chan->mutex);
}
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