1 files changed, 65 insertions, 0 deletions
diff --git a/src/knot/worker/queue.h b/src/knot/worker/queue.h
new file mode 100644
index 0000000..0ade7ab
--- /dev/null
+++ b/src/knot/worker/queue.h
@@ -0,0 +1,65 @@
+/*  Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "contrib/ucw/lists.h"
+
+struct task;
+typedef void (*task_cb)(struct task *);
+
+/*!
+ * \brief Task executable by a worker.
+ */
+typedef struct task {
+	void *ctx;
+	task_cb run;
+} worker_task_t;
+
+/*!
+ * \brief Worker queue.
+ */
+typedef struct worker_queue {
+	knot_mm_t mm_ctx;
+	list_t list;
+} worker_queue_t;
+
+/*!
+ * \brief Initialize worker queue.
+ */
+void worker_queue_init(worker_queue_t *queue);
+
+/*!
+ * \brief Deinitialize worker queue.
+ */
+void worker_queue_deinit(worker_queue_t *queue);
+
+/*!
+ * \brief Insert new item into the queue.
+ */
+void worker_queue_enqueue(worker_queue_t *queue, worker_task_t *task);
+
+/*!
+ * \brief Remove item from the queue.
+ *
+ * \return Task or NULL if the queue is empty.
+ */
+worker_task_t *worker_queue_dequeue(worker_queue_t *queue);
+
+/*!
+ * \brief Return number of tasks in worker queue.
+ */
+size_t worker_queue_length(worker_queue_t *queue);