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66 lines
2.4 KiB
C++
66 lines
2.4 KiB
C++
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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time/times.cpp
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Get process execution time statistics.
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*******************************************************************************/
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#include <sys/times.h>
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#include <stdint.h>
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#include <time.h>
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#include <unistd.h>
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// TODO: It is a bit needless to use 64-bit integers on 32-bit platforms and the
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// division is probably very inefficient. In addition, this implementation
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// doesn't hanndle a full 64-bit clock_t, however it won't cause problems
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// before a lot of years has passed, which is unlikely to happen, and the
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// clock function probably shouldn't be used in programs with that long
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// running times.
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// TODO: Does this function overflow correctly?
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clock_t timespec_to_clock(struct timespec t)
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{
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uint64_t ticks_per_second = (uint64_t) sysconf(_SC_CLK_TCK);
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uint64_t sec_contrib = (uint64_t) t.tv_sec * ticks_per_second;
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uint64_t nsec_contrib = (uint64_t) t.tv_nsec * ticks_per_second;
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return (clock_t) (sec_contrib + nsec_contrib / 1000000000);
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}
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// TODO: This function is crap and has been replaced by timens or clock_gettime.
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extern "C" clock_t times(struct tms* buf)
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{
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if ( buf )
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{
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struct tmns tmns;
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if ( timens(&tmns) < 0 )
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return (clock_t) -1;
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buf->tms_utime = timespec_to_clock(tmns.tmns_utime);
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buf->tms_stime = timespec_to_clock(tmns.tmns_stime);
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buf->tms_cutime = timespec_to_clock(tmns.tmns_cutime);
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buf->tms_cstime = timespec_to_clock(tmns.tmns_cstime);
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}
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// TODO: Should this be CLOCK_REALTIME instead?
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struct timespec now;
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if ( clock_gettime(CLOCK_MONOTONIC, &now) < 0 )
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return -1;
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return timespec_to_clock(now);
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}
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