1 /* System-dependent timing definitions. Linux version. 2 Copyright (C) 1996,1997,1999-2003,2010,2011,2012 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <http://www.gnu.org/licenses/>. */ 18 19 /* 20 * Never include this file directly; use <time.h> instead. 21 */ 22 23 #if defined __need_timeval || defined __USE_GNU 24 # ifndef _STRUCT_TIMEVAL 25 # define _STRUCT_TIMEVAL 1 26 # include <bits/types.h> 27 28 /* A time value that is accurate to the nearest 29 microsecond but also has a range of years. */ 30 struct timeval 31 { 32 __time_t tv_sec; /* Seconds. */ 33 __suseconds_t tv_usec; /* Microseconds. */ 34 }; 35 # endif /* struct timeval */ 36 #endif 37 38 #ifndef __need_timeval 39 # ifndef _BITS_TIME_H 40 # define _BITS_TIME_H 1 41 42 /* ISO/IEC 9899:1990 7.12.1: <time.h> 43 The macro `CLOCKS_PER_SEC' is the number per second of the value 44 returned by the `clock' function. */ 45 /* CAE XSH, Issue 4, Version 2: <time.h> 46 The value of CLOCKS_PER_SEC is required to be 1 million on all 47 XSI-conformant systems. */ 48 # define CLOCKS_PER_SEC 1000000l 49 50 # if (!defined __STRICT_ANSI__ || defined __USE_POSIX) \ 51 && !defined __USE_XOPEN2K 52 /* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK 53 presents the real value for clock ticks per second for the system. */ 54 # include <bits/types.h> 55 extern long int __sysconf (int); 56 # define CLK_TCK ((__clock_t) __sysconf (2)) /* 2 is _SC_CLK_TCK */ 57 # endif 58 59 # ifdef __USE_POSIX199309 60 /* Identifier for system-wide realtime clock. */ 61 # define CLOCK_REALTIME 0 62 /* Monotonic system-wide clock. */ 63 # define CLOCK_MONOTONIC 1 64 /* High-resolution timer from the CPU. */ 65 # define CLOCK_PROCESS_CPUTIME_ID 2 66 /* Thread-specific CPU-time clock. */ 67 # define CLOCK_THREAD_CPUTIME_ID 3 68 /* Monotonic system-wide clock, not adjusted for frequency scaling. */ 69 # define CLOCK_MONOTONIC_RAW 4 70 /* Identifier for system-wide realtime clock, updated only on ticks. */ 71 # define CLOCK_REALTIME_COARSE 5 72 /* Monotonic system-wide clock, updated only on ticks. */ 73 # define CLOCK_MONOTONIC_COARSE 6 74 /* Monotonic system-wide clock that includes time spent in suspension. */ 75 # define CLOCK_BOOTTIME 7 76 /* Like CLOCK_REALTIME but also wakes suspended system. */ 77 # define CLOCK_REALTIME_ALARM 8 78 /* Like CLOCK_BOOTTIME but also wakes suspended system. */ 79 # define CLOCK_BOOTTIME_ALARM 9 80 81 /* Flag to indicate time is absolute. */ 82 # define TIMER_ABSTIME 1 83 # endif 84 85 # ifdef __USE_GNU 86 # include <bits/timex.h> 87 88 __BEGIN_DECLS 89 90 /* Tune a POSIX clock. */ 91 extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW; 92 93 __END_DECLS 94 # endif /* use GNU */ 95 96 # endif /* bits/time.h */ 97 #endif 98 99 #undef __need_timeval 100