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, 106 insertions, 0 deletions

diff --git a/src/lib/tests/timerwheel_test.c b/src/lib/tests/timerwheel_test.c
new file mode 100644
index 00000000..d9ca164e
--- /dev/null
+++ b/src/lib/tests/timerwheel_test.c
@@ -0,0 +1,106 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Test of the timer wheel
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 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, write to the Free Software
+ * Foundation, Inc., http://www.fsf.org/about/contact/.
+ */
+
+#include "timerwheel.c"
+
+#include <pthread.h>
+#include <time.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define MAX_ELEMENTS   100
+#define MAX_RESOLUTION 10  /* ms */
+#define MAX_ADDITIONS  1000
+
+int total;
+
+int add(void * o)
+{
+        total += *((int *) o);
+        return 0;
+}
+
+int timerwheel_test(int argc, char ** argv)
+{
+        struct timerwheel * tw;
+        long resolution;
+        long elements;
+        struct timespec wait;
+
+        int additions;
+
+        int check_total = 0;
+
+        int i;
+        int var = 5;
+
+        struct tw_f * f;
+
+        (void) argc;
+        (void) argv;
+
+        total = 0;
+
+        srand(time(NULL));
+
+        resolution = rand() % (MAX_RESOLUTION - 1) + 1;
+        elements = rand() % (MAX_ELEMENTS - 10) + 10;
+
+        tw = timerwheel_create(resolution, resolution * elements);
+        if (tw == NULL) {
+                printf("Failed to create timerwheel.\n");
+                return -1;
+        }
+
+        wait.tv_sec = (resolution * elements) / 1000;
+        wait.tv_nsec = ((resolution * elements) % 1000) * MILLION;
+
+        additions = rand() % MAX_ADDITIONS + 1000;
+
+        for (i = 0; i < additions; ++i) {
+                int delay = rand() % (resolution * elements);
+                check_total += var;
+                f = timerwheel_start(tw,
+                                     (void (*)(void *)) add,
+                                     (void *) &var,
+                                     delay);
+                if (f == NULL) {
+                        printf("Failed to add function.");
+                        return -1;
+                }
+        }
+
+        nanosleep(&wait, NULL);
+
+        /* On some systems and VMs, the scheduler may be too slow. */
+        if (total != check_total)
+                nanosleep(&wait, NULL);
+
+        timerwheel_destroy(tw);
+
+        if (total != check_total) {
+                printf("Totals do not match.\n");
+                return -1;
+        }
+
+        return 0;
+}