From 66084b816dd25a41f774240328a31d57efd276e4 Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Thu, 17 Sep 2009 03:18:51 +0000 Subject: Begin libsandglass implementation. --- src/tsc.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 src/tsc.c (limited to 'src/tsc.c') diff --git a/src/tsc.c b/src/tsc.c new file mode 100644 index 0000000..64fe1b1 --- /dev/null +++ b/src/tsc.c @@ -0,0 +1,39 @@ +/************************************************************************* + * Copyright (C) 2008 Tavian Barnes * + * * + * This file is part of The Sandglass Library. * + * * + * The Sandglass Library is free software; you can redistribute it * + * and/or modify it under the terms of the GNU Lesser General Public * + * License as published by the Free Software Foundation; either version * + * 3 of the License, or (at your option) any later version. * + * * + * The Sandglass 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 program. If not, see * + * . * + *************************************************************************/ + +#include "sandglass_impl.h" +#include "sandglass.h" +#include + +/* Gets the number of clock ticks per second */ +double +sandglass_tsc_resolution() +{ + static long tsc = 0; + struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 }; + + if (tsc == 0) { + tsc = sandglass_get_tsc(); + while (nanosleep(&ts, &ts) != 0); + tsc = sandglass_get_tsc() - tsc; + } + + return tsc*10.0; +} -- cgit v1.2.3