From 9df4b1d7e4dd38a5b0efd0614e04f18395663274 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Mon, 21 Feb 2005 08:05:49 +0000 Subject: Initial revision. --- lib/gethrxtime.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++ lib/gethrxtime.h | 37 ++++++++++++++++++++++++ lib/xtime.h | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 204 insertions(+) create mode 100644 lib/gethrxtime.c create mode 100644 lib/gethrxtime.h create mode 100644 lib/xtime.h (limited to 'lib') diff --git a/lib/gethrxtime.c b/lib/gethrxtime.c new file mode 100644 index 000000000..6f7bc098c --- /dev/null +++ b/lib/gethrxtime.c @@ -0,0 +1,80 @@ +/* gethrxtime -- get high resolution real time + + Copyright (C) 2005 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Written by Paul Eggert. */ + +#ifdef HAVE_CONFIG_H +# include +#endif + +#include "gethrxtime.h" + +#include +#if TIME_WITH_SYS_TIME +# include +# include +#else +# if HAVE_SYS_TIME_H +# include +# else +# include +# endif +#endif + +/* Get the time of a high-resolution clock, preferably one that is not + subject to resetting or drifting. */ + +xtime_t +gethrxtime (void) +{ +#if HAVE_NANOUPTIME + { + struct timespec ts; + nanouptime (&ts); + return xtime_make (ts.tv_sec, ts.tv_nsec); + } +#else + +# if defined CLOCK_MONOTONIC && HAVE_CLOCK_GETTIME + { + struct timespec ts; + if (clock_gettime (CLOCK_MONOTONIC, &ts) == 0) + return xtime_make (ts.tv_sec, ts.tv_nsec); + } +# endif + +#if HAVE_MICROUPTIME + { + struct timeval tv; + microuptime (&tv); + return xtime_make (tv.tv_sec, 1000 * tv.tv_usec); + } + + /* No monotonically increasing clocks are available; fall back on a + clock that might jump backwards, since it's the best we can do. */ +# elif HAVE_GETTIMEOFDAY && XTIME_PRECISION != 1 + { + struct timeval tv; + gettimeofday (&tv, NULL); + return xtime_make (tv.tv_sec, 1000 * tv.tv_usec); + } +# else + return xtime_make (time (NULL), 0); +# endif +#endif +} diff --git a/lib/gethrxtime.h b/lib/gethrxtime.h new file mode 100644 index 000000000..2c0e36da7 --- /dev/null +++ b/lib/gethrxtime.h @@ -0,0 +1,37 @@ +/* gethrxtime -- get high resolution real time + + Copyright (C) 2005 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Written by Paul Eggert. */ + +#ifndef GETHRXTIME_H_ +#define GETHRXTIME_H_ 1 + +#include "xtime.h" + +/* Get the current time, as a count of the number of nanoseconds since + an arbitrary epoch (e.g., the system boot time). This clock can't + be set, is always increasing, and is nearly linear. */ + +#if HAVE_ARITHMETIC_HRTIME_T && HAVE_DECL_GETHRTIME +# include +static inline xtime_t gethrxtime (void) { return gethrtime (); } +#else +xtime_t gethrxtime (void); +#endif + +#endif diff --git a/lib/xtime.h b/lib/xtime.h new file mode 100644 index 000000000..333f895b6 --- /dev/null +++ b/lib/xtime.h @@ -0,0 +1,87 @@ +/* xtime -- extended-resolution integer time stamps + + Copyright (C) 2005 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Written by Paul Eggert. */ + +#ifndef XTIME_H_ +#define XTIME_H_ 1 + +/* xtime_t is a signed type used for time stamps. It is an integer + type that is a count of nanoseconds -- except for obsolescent hosts + without sufficiently-wide integers, where it is a count of + seconds. */ +#if HAVE_LONG_LONG +typedef long long int xtime_t; +# define XTIME_PRECISION 1000000000LL +#else +# include +typedef long int xtime_t; +# if LONG_MAX >> 31 >> 31 == 0 +# define XTIME_PRECISION 1L +# else +# define XTIME_PRECISION 1000000000L +# endif +#endif + +/* Return an extended time value that contains S seconds and NS + nanoseconds, without any overflow checking. */ +static inline xtime_t +xtime_make (xtime_t s, int ns) +{ + if (XTIME_PRECISION == 1) + return s; + else + return XTIME_PRECISION * s + ns; +} + +/* Return the number of seconds in T, which must be nonnegative. */ +static inline xtime_t +xtime_nonnegative_sec (xtime_t t) +{ + return t / XTIME_PRECISION; +} + +/* Return the number of seconds in T. */ +static inline xtime_t +xtime_sec (xtime_t t) +{ + return (XTIME_PRECISION == 1 + ? t + : t < 0 + ? (t + XTIME_PRECISION - 1) / XTIME_PRECISION - 1 + : xtime_nonnegative_sec (t)); +} + +/* Return the number of nanoseconds in T, which must be nonnegative. */ +static inline int +xtime_nonnegative_nsec (xtime_t t) +{ + return t % XTIME_PRECISION; +} + +/* Return the number of nanoseconds in T. */ +static inline int +xtime_nsec (xtime_t t) +{ + int ns = t % XTIME_PRECISION; + if (ns < 0) + ns += XTIME_PRECISION; + return ns; +} + +#endif -- cgit v1.2.3-70-g09d2