iou: initial commit

This implements a barebones IO-oriented callback scheduler built
atop the new kernel io-uring interface via liburing.

There's not much going on here.  The caller must still use
liburing for preparing the SQEs in iou_op_t operations allocated
via iou_op_new(), but that's basically all that's needed from
liburing.

1 files changed, 39 insertions, 0 deletions

diff --git a/src/iou.h b/src/iou.h
new file mode 100644
index 0000000..0c7c5c2
--- /dev/null
+++ b/src/iou.h
@@ -0,0 +1,39 @@
+/*
+ *  Copyright (C) 2020 - Vito Caputo - <vcaputo@pengaru.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 3 as published
+ *  by the Free Software Foundation.
+ *
+ *  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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _IOU_H
+#define _IOU_H
+
+#include <liburing.h>
+
+typedef struct iou_t iou_t;
+
+typedef struct iou_op_t {
+	struct io_uring_sqe	*sqe;
+	int			result;
+} iou_op_t;
+
+
+iou_t * iou_new(unsigned entries);
+iou_t * iou_free(iou_t *iou);
+iou_op_t * iou_op_new(iou_t *iou);
+void iou_op_queue(iou_t *iou, iou_op_t *op, int (*cb)(void *cb_data), void *cb_data);
+int iou_flush(iou_t *iou);
+int iou_run(iou_t *iou);
+int iou_quit(iou_t *iou);
+int iou_resize(iou_t *iou, unsigned entries);
+
+#endif