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43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/* High precision, low overhead timing functions. Generic version.
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Copyright (C) 1998-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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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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<https://www.gnu.org/licenses/>. */
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#ifndef _HP_TIMING_H
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#define _HP_TIMING_H 1
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#include <time.h>
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#include <stdint.h>
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#include <hp-timing-common.h>
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/* It should not be used for ld.so. */
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#define HP_TIMING_INLINE (0)
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typedef uint64_t hp_timing_t;
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/* The clock_gettime (CLOCK_MONOTONIC) has unspecified starting time,
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nano-second accuracy, and for some architectues is implemented as
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vDSO symbol. */
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#define HP_TIMING_NOW(var) \
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({ \
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struct timespec tv; \
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__clock_gettime (CLOCK_MONOTONIC, &tv); \
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(var) = (tv.tv_nsec + UINT64_C(1000000000) * tv.tv_sec); \
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})
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#endif /* hp-timing.h */
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