2 This file is a part of libcds - Concurrent Data Structures library
4 (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2016
6 Source code repo: http://github.com/khizmax/libcds/
7 Download: http://sourceforge.net/projects/libcds/files/
9 Redistribution and use in source and binary forms, with or without
10 modification, are permitted provided that the following conditions are met:
12 * Redistributions of source code must retain the above copyright notice, this
13 list of conditions and the following disclaimer.
15 * Redistributions in binary form must reproduce the above copyright notice,
16 this list of conditions and the following disclaimer in the documentation
17 and/or other materials provided with the distribution.
19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
23 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
25 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
26 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #ifndef CDSLIB_OS_FREE_BSD_TIMER_H
32 #define CDSLIB_OS_FREE_BSD_TIMER_H
34 #ifndef CDSLIB_OS_TIMER_H
35 # error "<cds/os/timer.h> must be included"
39 #include <sys/timespec.h>
42 namespace cds { namespace OS {
44 CDS_CXX11_INLINE_NAMESPACE namespace Free_BSD {
46 // High resolution timer
49 typedef struct timespec native_timer_type;
50 typedef long long native_duration_type;
53 native_timer_type m_tmStart;
57 Timer() { current( m_tmStart ) ; }
59 static void current( native_timer_type& tmr )
61 // faster than gettimeofday() and posix
62 # ifdef CLOCK_REALTIME_FAST
63 ::clock_gettime( CLOCK_REALTIME_FAST, &tmr );
65 ::clock_gettime( CLOCK_REALTIME_FAST, &tmr );
69 static native_timer_type current()
71 native_timer_type tmr;
80 double dblRet = ( ts.tv_sec - m_tmStart.tv_sec ) + ( ts.tv_nsec - m_tmStart.tv_nsec ) / 1.0E9;
85 double duration( native_duration_type dur )
87 return double( dur ) / 1.0E9;
92 return duration( native_duration() );
95 native_duration_type native_duration()
99 return native_duration( m_tmStart, ts );
102 static native_duration_type native_duration( const native_timer_type& nStart, const native_timer_type& nEnd )
104 return native_duration_type( nEnd.tv_sec - nStart.tv_sec ) * 1000000000 + ( nEnd.tv_nsec - nStart.tv_nsec);
107 static unsigned long long random_seed()
109 native_timer_type tmr;
111 return ( ((unsigned long long)(tmr.tv_sec)) << 32 ) + tmr.tv_nsec;
115 } // namespace Free_BSD
117 #ifndef CDS_CXX11_INLINE_NAMESPACE_SUPPORT
118 typedef Free_BSD::Timer Timer;
121 }} // namespace cds::OS
124 #endif // #ifndef CDSLIB_OS_FREE_BSD_TIMER_H