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sortix--sortix/libc/time/clock.cpp

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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013
This file is part of the Sortix C Library.
The Sortix C 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 Sortix C 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 the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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time/clock.cpp
Get process execution time.
*******************************************************************************/
#include <assert.h>
#include <time.h>
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// TODO: This function is crap and has been replaced by clock_gettime.
extern "C" clock_t clock()
{
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struct timespec now;
if ( clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &now) < 0 )
return -1;
static_assert(CLOCKS_PER_SEC == 1000000, "CLOCKS_PER_SEC == 1000000");
return (clock_t) now.tv_sec * 1000000 + (clock_t) now.tv_sec / 1000;
}