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time.h
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/* System-dependent timing definitions. Linux version. Copyright (C) 1996-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ /* * Never include this file directly; use <time.h> instead. */ #ifndef _BITS_TIME_H #define _BITS_TIME_H 1 #include <bits/types.h> /* ISO/IEC 9899:1999 7.23.1: Components of time The macro `CLOCKS_PER_SEC' is an expression with type `clock_t' that is the number per second of the value returned by the `clock' function. */ /* CAE XSH, Issue 4, Version 2: <time.h> The value of CLOCKS_PER_SEC is required to be 1 million on all XSI-conformant systems. */ #define CLOCKS_PER_SEC ((__clock_t) 1000000) #if (!defined __STRICT_ANSI__ || defined __USE_POSIX) \ && !defined __USE_XOPEN2K /* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK presents the real value for clock ticks per second for the system. */ extern long int __sysconf (int); # define CLK_TCK ((__clock_t) __sysconf (2)) /* 2 is _SC_CLK_TCK */ #endif #ifdef __USE_POSIX199309 /* Identifier for system-wide realtime clock. */ # define CLOCK_REALTIME 0 /* Monotonic system-wide clock. */ # define CLOCK_MONOTONIC 1 /* High-resolution timer from the CPU. */ # define CLOCK_PROCESS_CPUTIME_ID 2 /* Thread-specific CPU-time clock. */ # define CLOCK_THREAD_CPUTIME_ID 3 /* Monotonic system-wide clock, not adjusted for frequency scaling. */ # define CLOCK_MONOTONIC_RAW 4 /* Identifier for system-wide realtime clock, updated only on ticks. */ # define CLOCK_REALTIME_COARSE 5 /* Monotonic system-wide clock, updated only on ticks. */ # define CLOCK_MONOTONIC_COARSE 6 /* Monotonic system-wide clock that includes time spent in suspension. */ # define CLOCK_BOOTTIME 7 /* Like CLOCK_REALTIME but also wakes suspended system. */ # define CLOCK_REALTIME_ALARM 8 /* Like CLOCK_BOOTTIME but also wakes suspended system. */ # define CLOCK_BOOTTIME_ALARM 9 /* Like CLOCK_REALTIME but in International Atomic Time. */ # define CLOCK_TAI 11 /* Flag to indicate time is absolute. */ # define TIMER_ABSTIME 1 #endif #ifdef __USE_GNU # include <bits/timex.h> __BEGIN_DECLS /* Tune a POSIX clock. */ extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW; __END_DECLS #endif /* use GNU */ #endif /* bits/time.h */