4 // Fraunhofer Institute for Open Communication Systems (FOKUS)
5 // Competence Center NETwork research (NET), St. Augustin, GERMANY
6 // Stefan Bund <g0dil@berlios.de>
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 2 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the
20 // Free Software Foundation, Inc.,
21 // 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 \brief ClockService inline non-template implementation */
27 #include <boost/date_time/posix_time/posix_time_types.hpp>
29 #define prefix_ inline
30 ///////////////////////////////cci.p///////////////////////////////////////
32 ///////////////////////////////////////////////////////////////////////////
35 prefix_ senf::ClockService::clock_type senf::ClockService::now()
37 return instance().now_m();
40 prefix_ senf::ClockService::abstime_type senf::ClockService::abstime(clock_type clock)
42 return instance().abstime_m(clock);
45 prefix_ senf::ClockService::clock_type senf::ClockService::clock(abstime_type time)
47 return instance().clock_m(time);
50 prefix_ senf::ClockService::clock_type senf::ClockService::nanoseconds(clock_type v)
55 prefix_ senf::ClockService::clock_type senf::ClockService::microseconds(clock_type v)
57 return v * nanoseconds(1000);
60 prefix_ senf::ClockService::clock_type senf::ClockService::milliseconds(clock_type v)
62 return v * microseconds(1000);
65 prefix_ senf::ClockService::clock_type senf::ClockService::seconds(clock_type v)
67 return v * milliseconds(1000);
70 prefix_ senf::ClockService::clock_type senf::ClockService::minutes(clock_type v)
72 return v * seconds(60);
75 prefix_ senf::ClockService::clock_type senf::ClockService::hours(clock_type v)
77 return v * minutes(60);
80 prefix_ senf::ClockService::clock_type senf::ClockService::days(clock_type v)
85 prefix_ void senf::ClockService::restart()
87 instance().restart_m();
90 ////////////////////////////////////////
93 prefix_ senf::ClockService::clock_type senf::ClockService::now_m()
95 // We want to make the normal case (no skew) really fast. This first 'checkSkew' *might*
96 // transiently fail if a SIGALRM is delivered in the midst of the test. updateSkew will
97 // therefore block signals and do the check again to make sure.
99 // The opposite case (the test returns 'false' even though it should return 'true') is so highly
100 // improbable that it is treated as academic. (it will be catched by the next SIGALRM)
102 boost::posix_time::ptime time (boost::posix_time::microsec_clock::universal_time());
106 // 'clock' will pick up the corrected base_ value if needed.
107 return clock_m(time);
110 prefix_ senf::ClockService::abstime_type senf::ClockService::abstime_m(clock_type clock)
112 #ifdef BOOST_DATE_TIME_POSIX_TIME_STD_CONFIG
113 return base_ + boost::posix_time::nanoseconds(clock);
115 return base_ + boost::posix_time::microseconds((clock+500)/1000);
119 prefix_ senf::ClockService::clock_type senf::ClockService::clock_m(abstime_type time)
121 ///\fixme What happens, if base_ is changed in SIGALRM while reading it here ?
123 // Idea: Have *two* base values: one is written by the SIGALRM handler, the other is only
124 // Written by synchronous code. If they differ, we block signals, copy over and continue. If
125 // they transiently differ because we are reading the SIGALRM value while it is being changed
126 // this does not matter: We will then still copy it over.
128 boost::posix_time::time_duration delta (time - base_);
129 return clock_type( delta.ticks() )
130 * clock_type( 1000000000UL / boost::posix_time::time_duration::ticks_per_second() );
133 prefix_ bool senf::ClockService::checkSkew(boost::posix_time::ptime time)
135 boost::posix_time::ptime h (heartbeat_); // reduce chance for race condition
136 return time < h || (time - h) > boost::posix_time::seconds(2*CheckInterval);
139 prefix_ void senf::ClockService::clockSkew(boost::posix_time::ptime time,
140 boost::posix_time::ptime expected)
142 base_ += (time - expected);
145 ///////////////////////////////cci.e///////////////////////////////////////
152 // comment-column: 40
153 // c-file-style: "senf"
154 // indent-tabs-mode: nil
155 // ispell-local-dictionary: "american"
156 // compile-command: "scons -u test"