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65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
/* System-dependent timing definitions. Generic version.
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Copyright (C) 1996-2020 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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<https://www.gnu.org/licenses/>. */
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/*
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* Never include this file directly; use <time.h> instead.
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*/
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#ifndef _BITS_TIME_H
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#define _BITS_TIME_H 1
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#include <bits/types.h>
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/* ISO/IEC 9899:1999 7.23.1: Components of time
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The macro `CLOCKS_PER_SEC' is an expression with type `clock_t' that is
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the number per second of the value returned by the `clock' function. */
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/* CAE XSH, Issue 4, Version 2: <time.h>
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The value of CLOCKS_PER_SEC is required to be 1 million on all
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XSI-conformant systems. */
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#define CLOCKS_PER_SEC ((__clock_t) 1000000)
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#if (!defined __STRICT_ANSI__ || defined __USE_POSIX) \
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&& !defined __USE_XOPEN2K
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/* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK
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presents the real value for clock ticks per second for the system. */
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extern long int __sysconf (int);
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# define CLK_TCK ((__clock_t) __sysconf (2)) /* 2 is _SC_CLK_TCK */
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#endif
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#ifdef __USE_POSIX199309
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/* Identifier for system-wide realtime clock. */
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# define CLOCK_REALTIME 0
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/* Monotonic system-wide clock. */
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# define CLOCK_MONOTONIC 1
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/* High-resolution timer from the CPU. */
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# define CLOCK_PROCESS_CPUTIME_ID 2
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/* Thread-specific CPU-time clock. */
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# define CLOCK_THREAD_CPUTIME_ID 3
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/* Monotonic system-wide clock, not adjusted for frequency scaling. */
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# define CLOCK_MONOTONIC_RAW 4
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/* Identifier for system-wide realtime clock, updated only on ticks. */
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# define CLOCK_REALTIME_COARSE 5
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/* Monotonic system-wide clock, updated only on ticks. */
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# define CLOCK_MONOTONIC_COARSE 6
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/* Flag to indicate time is absolute. */
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# define TIMER_ABSTIME 1
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#endif
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#endif /* bits/time.h */
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