[boost] [Boost-bugs] [ boost-Bugs-1520489 ] significantly different timer class behaviour on Win and Lin

From: SourceForge.net (noreply_at_[hidden])
Date: 2006-07-11 07:41:56

Bugs item #1520489, was opened at 2006-07-11 15:41
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1520489&group_id=7586

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: timer
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Sukhonosenko Kirill (skv)
Assigned to: Beman Dawes (beman_dawes)
Summary: significantly different timer class behaviour on Win and Lin

Initial Comment:
clock() function used in implementation of 
boost::timer behaves differently on Windows (MS XP 
Pro, MSVC 7.1) and Linux (FC3, gcc 3.4.2).

Windows: clock measures elapsed time (wall clock). 
And this comply with boost::timer interface 
description.

Example:
boost::timer t;
double sec = 1;
::Sleep(sec*1000); 
double d = t.elapsed();
assert(abs(d-sec) < 0.1);

Linux: clock() function returnes process CPU time. 
The above code will fail.

This difference makes boost::timer a bad candidate 
for cross-platform development. I can propose 
alternative implementation with simalar right 
behaviour.

------------------------------------------
#ifndef 
_Timer_h_dlfkgh9384ytdflg9045uhy0823475mgd385uyn0v68uy
c0n4c5
#define 
_Timer_h_dlfkgh9384ytdflg9045uhy0823475mgd385uyn0v68uy
c0n4c5

#include <time.h>

namespace Timer
{
        /*
        Measures intervals of wall clock time, but 
not process CPU time. Resolution & accuracy depends 
on time function abilities.
        */
        class timer
        {
        public:
                // setup reference time point
                timer()
                {
                        restart();
                }

                // reset reference time point
                void restart()
                {
                        ::time(&m_ref_time);
                }

                // report difference between current 
time and reference point
                double elapsed() const
                {
                        time_t curr_time;
                        ::time(&curr_time);
                        double diff = difftime
(curr_time, m_ref_time);
                        return diff;
                }

        // forbidden
        private:
                timer(const timer &);
                timer & operator=(const timer &);

        private:
                time_t m_ref_time;
        };

} // namespace Timer

#endif //_Timer_h_dlfkgh9384ytdflg9045uhy0823475mgd385
uyn0v68uyc0n4c5

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1520489&group_id=7586

-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Boost-bugs mailing list
Boost-bugs_at_[hidden]
https://lists.sourceforge.net/lists/listinfo/boost-bugs