1 /* System-dependent timing definitions. Generic version. 2 Copyright (C) 1996,1997,1999-2002,2003 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, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 /* 21 * Never include this file directly; use <time.h> instead. 22 */ 23 24 #ifndef __need_timeval 25 # ifndef _BITS_TIME_H 26 # define _BITS_TIME_H 1 27 28 /* ISO/IEC 9899:1990 7.12.1: <time.h> 29 The macro `CLOCKS_PER_SEC' is the number per second of the value 30 returned by the `clock' function. */ 31 /* CAE XSH, Issue 4, Version 2: <time.h> 32 The value of CLOCKS_PER_SEC is required to be 1 million on all 33 XSI-conformant systems. */ 34 # define CLOCKS_PER_SEC 1000000l 35 36 # if !defined __STRICT_ANSI__ && !defined __USE_XOPEN2K 37 /* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK 38 presents the real value for clock ticks per second for the system. */ 39 # include <bits/types.h> 40 extern long int __sysconf (int); 41 # define CLK_TCK ((__clock_t) __sysconf (2)) /* 2 is _SC_CLK_TCK */ 42 # endif 43 44 # ifdef __USE_POSIX199309 45 /* Identifier for system-wide realtime clock. */ 46 # define CLOCK_REALTIME 0 47 /* Monotonic system-wide clock. */ 48 # define CLOCK_MONOTONIC 1 49 /* High-resolution timer from the CPU. */ 50 # define CLOCK_PROCESS_CPUTIME_ID 2 51 /* Thread-specific CPU-time clock. */ 52 # define CLOCK_THREAD_CPUTIME_ID 3 53 54 /* Flag to indicate time is absolute. */ 55 # define TIMER_ABSTIME 1 56 # endif 57 58 # endif /* bits/time.h */ 59 #endif 60 61 #ifdef __need_timeval 62 # undef __need_timeval 63 # ifndef _STRUCT_TIMEVAL 64 # define _STRUCT_TIMEVAL 1 65 # include <bits/types.h> 66 67 /* A time value that is accurate to the nearest 68 microsecond but also has a range of years. */ 69 struct timeval 70 { 71 __time_t tv_sec; /* Seconds. */ 72 __suseconds_t tv_usec; /* Microseconds. */ 73 }; 74 # endif /* struct timeval */ 75 #endif /* need timeval */ 76