lib: Add basic FRCT mechanisms

This adds the basic FRCT mechanisms to the library. Upon flow alloc or
accept an FRCT instance is now created and used when reading or
writing to the flow. The timerwheel has been refactored to allow
recharging timers and removing them and is now part of the
library. The first SDU sent over the connection has the DRF set and
this initializes the connection. Sender and receiver inactivity timers
are added.

1 files changed, 45 insertions, 0 deletions

diff --git a/include/ouroboros/timerwheel.h b/include/ouroboros/timerwheel.h
new file mode 100644
index 00000000..e259c855
--- /dev/null
+++ b/include/ouroboros/timerwheel.h
@@ -0,0 +1,45 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Ring buffer for incoming SDUs
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@ugent.be>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., http://www.fsf.org/about/contact/.
+ */
+
+#ifndef OUROBOROS_LIB_TIMERWHEEL_H
+#define OUROBOROS_LIB_TIMERWHEEL_H
+
+struct timerwheel;
+
+struct timerwheel * timerwheel_create(time_t resolution,
+                                      time_t max_delay);
+
+void                timerwheel_destroy(struct timerwheel * tw);
+
+struct tw_f *       timerwheel_start(struct timerwheel * tw,
+                                     void (* func)(void *),
+                                     void *              arg,
+                                     time_t              delay); /* ms */
+
+int                 timerwheel_restart(struct timerwheel * tw,
+                                       struct tw_f *       f,
+                                       time_t              delay); /* ms */
+
+void                timerwheel_stop(struct timerwheel * tw,
+                                    struct tw_f *       f);
+
+#endif /* OUROBOROS_LIB_TIMERWHEEL_H */