/* System-dependent timing definitions. Linux version.

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Copyright (C) 1996-2018 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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/*

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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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/* Monotonic system-wide clock that includes time spent in suspension. */

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# define CLOCK_BOOTTIME 7

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/* Like CLOCK_REALTIME but also wakes suspended system. */

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# define CLOCK_REALTIME_ALARM 8

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/* Like CLOCK_BOOTTIME but also wakes suspended system. */

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# define CLOCK_BOOTTIME_ALARM 9

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/* Like CLOCK_REALTIME but in International Atomic Time. */

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# define CLOCK_TAI 11

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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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#ifdef __USE_GNU

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# include <bits/timex.h>

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__BEGIN_DECLS

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/* Tune a POSIX clock. */

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extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW;

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__END_DECLS

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#endif /* use GNU */

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#endif /* bits/time.h */

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