--- /dev/null
+/*
+ This file is a part of libcds - Concurrent Data Structures library
+
+ (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2017
+
+ Source code repo: http://github.com/khizmax/libcds/
+ Download: http://sourceforge.net/projects/libcds/files/
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this
+ list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef CDSLIB_OS_OSX_TIMER_H
+#define CDSLIB_OS_OSX_TIMER_H
+
+#ifndef CDSLIB_OS_TIMER_H
+# error "<cds/os/timer.h> must be included"
+#endif
+
+#include <time.h>
+#include <sys/time.h>
+#include <mach/clock.h>
+#include <mach/mach.h>
+
+// From http://stackoverflow.com/questions/11680461/monotonic-clock-on-osx
+
+//@cond none
+namespace cds { namespace OS {
+ inline namespace OS_X {
+
+ // High resolution timer
+ class Timer {
+ public:
+ typedef mach_timespec_t native_timer_type;
+ typedef long long native_duration_type;
+
+ private:
+ native_timer_type m_tmStart;
+ clock_serv_t m_Service;
+
+ public:
+
+ Timer()
+ {
+ host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &m_Service);
+ current( m_tmStart );
+ }
+ ~Timer()
+ {
+ mach_port_deallocate(mach_task_self(), m_Service);
+ }
+
+ void current( native_timer_type& tmr )
+ {
+ clock_get_time(m_Service, &tmr);
+ }
+
+ native_timer_type current()
+ {
+ native_timer_type tmr;
+ current(tmr);
+ return tmr;
+ }
+
+ double reset()
+ {
+ native_timer_type ts;
+ current( ts );
+ double dblRet = ( ts.tv_sec - m_tmStart.tv_sec ) + ( ts.tv_nsec - m_tmStart.tv_nsec ) / 1.0E9;
+ m_tmStart = ts;
+ return dblRet;
+ }
+
+ double duration( native_duration_type dur )
+ {
+ return double( dur ) / 1.0E9;
+ }
+
+ double duration()
+ {
+ return duration( native_duration());
+ }
+
+ native_duration_type native_duration()
+ {
+ native_timer_type ts;
+ current( ts );
+ return native_duration( m_tmStart, ts );
+ }
+
+ static native_duration_type native_duration( const native_timer_type& nStart, const native_timer_type& nEnd )
+ {
+ return native_duration_type( nEnd.tv_sec - nStart.tv_sec ) * 1000000000 + ( nEnd.tv_nsec - nStart.tv_nsec);
+ }
+
+ static unsigned long long random_seed()
+ {
+ native_timer_type tmr;
+ Timer tm;
+ tm.current( tmr );
+ return ( ((unsigned long long)(tmr.tv_sec)) << 32 ) + tmr.tv_nsec;
+ }
+ };
+ } // namespace OS_X
+
+}} // namespace cds::OS
+//@endcond
+
+#endif // #ifndef CDSLIB_OS_LINUX_TIMER_H