make PID timing more precise, setup P, I and DHEADmaster

1 files changed, 39 insertions, 0 deletions

diff --git a/timer.vala b/timer.vala
new file mode 100644
index 0000000..8999bfc
--- /dev/null
+++ b/timer.vala
@@ -0,0 +1,39 @@
+/* Copyright 2012, Sebastian Reichel <sre@ring0.de>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+public struct Timer {
+	private Posix.timespec time_old;
+
+	public void start() {
+		Posix.clock_gettime(Posix.CLOCK_MONOTONIC, out time_old);
+	}
+
+	public ulong ellapsed() {
+		ulong result;
+		Posix.timespec time_new;
+
+		Posix.clock_gettime(Posix.CLOCK_MONOTONIC, out time_new);
+
+		if(time_new.tv_sec < time_old.tv_sec)
+			result = 0;
+		else if(time_new.tv_sec == time_old.tv_sec)
+			result = (time_new.tv_nsec - time_old.tv_nsec) / 1000;
+		else
+			result = (time_new.tv_sec - time_old.tv_sec) * 1000 - (time_old.tv_nsec/1000) + (time_new.tv_nsec/1000);
+
+		time_old = time_new;
+		return result;
+	}
+}