From: Florian Forster Date: Sat, 30 Oct 2010 11:56:52 +0000 (+0200) Subject: src/utils_time.[ch]: Add module for sub-second time handling. X-Git-Tag: collectd-5.0.0-beta0~19^2~23 X-Git-Url: https://git.octo.it/?p=collectd.git;a=commitdiff_plain;h=1c2e242703c7dcd1de29aef49608cf89bfde5e4a src/utils_time.[ch]: Add module for sub-second time handling. --- diff --git a/configure.in b/configure.in index d00ac98e..48942b48 100644 --- a/configure.in +++ b/configure.in @@ -568,6 +568,16 @@ socket_needs_socket="no" AC_CHECK_FUNCS(socket, [], AC_CHECK_LIB(socket, socket, [socket_needs_socket="yes"], AC_MSG_ERROR(cannot find socket))) AM_CONDITIONAL(BUILD_WITH_LIBSOCKET, test "x$socket_needs_socket" = "xyes") +clock_gettime_needs_rt="no" +clock_gettime_needs_posix4="no" +AC_CHECK_FUNCS(clock_gettime, + [], + AC_CHECK_LIB(rt, clock_gettime, + [clock_gettime_needs_rt="yes"], + AC_CHECK_LIB(posix4, clock_gettime, + [clock_gettime_needs_posix4="yes"], + AC_MSG_ERROR(cannot find clock_gettime)))) + nanosleep_needs_rt="no" nanosleep_needs_posix4="no" AC_CHECK_FUNCS(nanosleep, @@ -577,8 +587,9 @@ AC_CHECK_FUNCS(nanosleep, AC_CHECK_LIB(posix4, nanosleep, [nanosleep_needs_posix4="yes"], AC_MSG_ERROR(cannot find nanosleep)))) -AM_CONDITIONAL(BUILD_WITH_LIBRT, test "x$nanosleep_needs_rt" = "xyes") -AM_CONDITIONAL(BUILD_WITH_LIBPOSIX4, test "x$nanosleep_needs_posix4" = "xyes") + +AM_CONDITIONAL(BUILD_WITH_LIBRT, test "x$clock_gettime_needs_rt" = "xyes" || test "x$nanosleep_needs_rt" = "xyes") +AM_CONDITIONAL(BUILD_WITH_LIBPOSIX4, test "x$clock_gettime_needs_posix4" = "xyes" || test "x$nanosleep_needs_posix4" = "xyes") AC_CHECK_FUNCS(sysctl, [have_sysctl="yes"], [have_sysctl="no"]) AC_CHECK_FUNCS(sysctlbyname, [have_sysctlbyname="yes"], [have_sysctlbyname="no"]) diff --git a/src/Makefile.am b/src/Makefile.am index 4bcc5ab2..69329bf2 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -41,6 +41,7 @@ collectd_SOURCES = collectd.c collectd.h \ utils_subst.c utils_subst.h \ utils_tail.c utils_tail.h \ utils_threshold.c utils_threshold.h \ + utils_time.c utils_time.h \ types_list.c types_list.h collectd_CPPFLAGS = $(AM_CPPFLAGS) $(LTDLINCL) diff --git a/src/utils_time.c b/src/utils_time.c new file mode 100644 index 00000000..31e31090 --- /dev/null +++ b/src/utils_time.c @@ -0,0 +1,44 @@ +/** + * collectd - src/utils_time.h + * Copyright (C) 2010 Florian octo Forster + * + * 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; only version 2 of the License is applicable. + * + * 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., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Authors: + * Florian octo Forster + **/ + +#include "collectd.h" +#include "utils_time.h" +#include "plugin.h" +#include "common.h" + +cdtime_t cdtime (void) /* {{{ */ +{ + int status; + struct timespec ts = { 0, 0 }; + + status = clock_gettime (CLOCK_REALTIME, &ts); + if (status != 0) + { + char errbuf[1024]; + ERROR ("cdtime: clock_gettime failed: %s", + sstrerror (errno, errbuf, sizeof (errbuf))); + return (0); + } + + return (TIMESPEC_TO_CDTIME_T (ts)); +} /* }}} cdtime_t cdtime */ + +/* vim: set sw=2 sts=2 et fdm=marker : */ diff --git a/src/utils_time.h b/src/utils_time.h new file mode 100644 index 00000000..fecf5447 --- /dev/null +++ b/src/utils_time.h @@ -0,0 +1,54 @@ +/** + * collectd - src/utils_time.h + * Copyright (C) 2010 Florian octo Forster + * + * 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; only version 2 of the License is applicable. + * + * 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., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Authors: + * Florian octo Forster + **/ + +#ifndef UTILS_TIME_H +#define UTILS_TIME_H 1 + +#include "collectd.h" + +/* + * "cdtime_t" is a 64bit unsigned integer. The time is stored at a 2^-30 second + * resolution, i.e. the most significant 34 bit are used to store the time in + * seconds, the least significant bits store the sub-second part in something + * very close to nanoseconds. *The* big advantage of storing time in this + * manner is that comparing times and calculating differences is as simple as + * it is with "time_t", i.e. a simple integer comparison / subtraction works. + */ +typedef uint64_t cdtime_t; + +/* 2^30 = 1073741824 */ +#define TIME_T_TO_CDTIME_T(t) (((cdtime_t) (t)) * 1073741824) +#define CDTIME_T_TO_TIME_T(t) ((time_t) ((t) / 1073741824)) + +#define CDTIME_T_TO_DOUBLE(t) (((double) (t)) / 1073741824.0) +#define DOUBLE_TO_CDTIME_T(d) ((cdtime_t) ((d) * 1073741824.0)) + +#define US_TO_CDTIME_T(us) ((cdtime_t) (((double) (us)) * 1073.741824)) +#define NS_TO_CDTIME_T(ns) ((cdtime_t) (((double) (ns)) * 1.073741824)) + +#define TIMEVAL_TO_CDTIME_T(tv) (TIME_T_TO_CDTIME_T ((tv).tv_sec) \ + + US_TO_CDTIME_T ((tv).tv_usec)) +#define TIMESPEC_TO_CDTIME_T(ts) (TIME_T_TO_CDTIME_T ((ts).tv_sec) \ + + NS_TO_CDTIME_T ((ts).tv_nsec)) + +cdtime_t cdtime (void); + +#endif /* UTILS_TIME_H */