From adfe7c37b333c245256885aa3d8ac1077e24ff18 Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Fri, 2 Nov 2012 19:24:33 +0100 Subject: make PID timing more precise, setup P, I and D --- timer.vala | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 timer.vala (limited to 'timer.vala') 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 + * + * 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; + } +} -- cgit v1.2.3