ipcpd: Add timerwheel

The timerwheel can be used to defer work to a certain timeslot in the
future.

1 files changed, 92 insertions, 0 deletions

diff --git a/src/ipcpd/tests/timerwheel_test.c b/src/ipcpd/tests/timerwheel_test.c
new file mode 100644
index 00000000..615e6e41
--- /dev/null
+++ b/src/ipcpd/tests/timerwheel_test.c
@@ -0,0 +1,92 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Test of the timer wheel
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "timerwheel.c"
+
+#include <pthread.h>
+#include <time.h>
+#include <stdlib.h>
+
+#define MAX_ELEMENTS   500
+#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;
+
+        (void) argc;
+        (void) argv;
+
+        srand(time(NULL));
+
+        total = 0;
+
+        resolution = rand() % (MAX_RESOLUTION - 1) + 1;
+        elements = rand() % (MAX_ELEMENTS - 10) + 10;
+
+        tw = timerwheel_create(resolution, resolution * elements);
+        if (tw == NULL)
+                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);
+                int var = rand() % 5;
+                check_total += var;
+                timerwheel_add(tw,
+                               (void (*)(void *)) add,
+                               (void *) &var,
+                               sizeof(var),
+                               delay);
+        }
+
+        nanosleep(&wait, NULL);
+
+        timerwheel_destroy(tw);
+
+        if (total != check_total)
+                return -1;
+
+        return 0;
+}