1 files changed, 69 insertions, 0 deletions
diff --git a/src/mbgl/util/uv-channel.c b/src/mbgl/util/uv-channel.c
new file mode 100644
index 0000000000..4e3b9fa5ff
--- /dev/null
+++ b/src/mbgl/util/uv-channel.c
@@ -0,0 +1,69 @@
+#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);
+}