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_WIN_TIMER_H
32 #define CDSLIB_OS_WIN_TIMER_H
34 #ifndef CDSLIB_OS_TIMER_H
35 # error "<cds/os/timer.h> must be included"
44 namespace cds { namespace OS {
45 CDS_CXX11_INLINE_NAMESPACE namespace Win32 {
47 /// High resolution timer
49 Implementation of high resolution timer for Windows platforms.
50 The implementation build on QueryPerformanceCounter API.
54 typedef LARGE_INTEGER native_timer_type ; ///< Native timer type
55 typedef long long native_duration_type ; ///< Native duration type
58 native_timer_type m_nFrequency;
59 native_timer_type m_nStart;
64 ::QueryPerformanceFrequency( &m_nFrequency );
68 /// Places into \p tmr the current time in native Windows format
69 static void current( native_timer_type& tmr )
71 ::QueryPerformanceCounter( &tmr );
74 /// Returns current time in native Windows format
75 static native_timer_type current()
77 native_timer_type tmr;
82 /// Sets internal start time to current time. Returns duration from prevoius start time to current.
85 native_timer_type nCur;
87 double dblRet = double(nCur.QuadPart - m_nStart.QuadPart) / m_nFrequency.QuadPart;
88 m_nStart.QuadPart = nCur.QuadPart;
92 /// Translates \p dur from native format to seconds
93 double duration( native_duration_type dur )
95 return double( dur ) / m_nFrequency.QuadPart;
98 /// Returns duration (in seconds) from start time to current
101 return duration( native_duration());
104 /// Returns duration (in native format) from start time to current
105 native_duration_type native_duration()
107 native_timer_type ts;
109 return native_duration( m_nStart, ts );
112 /// Calculates duration (in native format) between \p nEnd and \p nStart
113 static native_duration_type native_duration( const native_timer_type& nStart, const native_timer_type& nEnd )
115 return nEnd.QuadPart - nStart.QuadPart;
118 static unsigned long long random_seed()
120 return current().QuadPart;
127 #ifndef CDS_CXX11_INLINE_NAMESPACE_SUPPORT
128 typedef Win32::Timer Timer;
131 }} // namespae cds::OS
134 #endif // #ifndef CDSLIB_OS_WIN_TIMER_H