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58206c6863
Resolves #12515. Use CLOCK_PROCESS_CPUTIME_ID instead of times to get better precision in the value returned by clock.
41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
/* Return the time used by the program so far (user time + system time).
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Copyright (C) 1991-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sys/times.h>
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#include <time.h>
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#include <unistd.h>
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#if CLOCKS_PER_SEC != 1000000l
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# error "CLOCKS_PER_SEC should be 1000000"
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#endif
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clock_t
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clock (void)
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{
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struct timespec ts;
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/* clock_gettime shouldn't fail here since CLOCK_PROCESS_CPUTIME_ID is
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supported since 2.6.12. Check the return value anyway in case the kernel
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barfs on us for some reason. */
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if (__glibc_unlikely (__clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &ts) != 0))
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return (clock_t) -1;
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return (ts.tv_sec * CLOCKS_PER_SEC
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+ ts.tv_nsec / (1000000000 / CLOCKS_PER_SEC));
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}
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