Re: [Dev-C++] sleep() for Windows XP

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You are correct! I went to the documentation myself and I was incorrect. For
that I apologizes for giving incorrect information. The thread is suspend,
and then it is awaken by the operating system.

Sorry for the wrong information.....

-----Original Message-----
From: Per Westermark [mailto:pw...@ia...] 
Sent: Tuesday, July 24, 2007 11:52 AM
To: Adam Jones
Cc: 'matheus ribeiro'; 'Dev Cpp MailingLinst'
Subject: Re: [Dev-C++] sleep() for Windows XP

Not really correct. The Sleep() call does not busy-loop. It suspends the
current thread to allow other threads to run for the delay duration.

This is the description for the dwMilliseconds parameter to Sleep().

"Specifies the time, in milliseconds, for which to suspend execution. A
value of zero causes the thread to relinquish the remainder of its time
slice to any other thread of equal priority that is ready to run. If there
are no other threads of equal priority ready to run, the function returns
immediately, and the thread continues execution. A value of INFINITE
causes an infinite delay."

This is easy to test by writing a miniature program with a Sleep(60000) -
the program will terminate after one minute, but during this time the Task
Manager will show that it doesn't consume any processor time.

/pwm

On Tue, 24 Jul 2007, Adam Jones wrote:

> >> You Wrote:
> >>But it also eats your cpu cycles... Sleep doest consume CPU.
>
> Please reserve your comments to information that is accurate. You are
giving
> the wrong information. I don't know any CPU Instruction that does not
> require cpu cycles.
> Sleep() is not some magical command, nor a cpu instruction. It is a
function
> call just like any other function call. It takes a value (DWORD) and
returns
> VOID. It's prototype declaration is in windows.h.
>
> If you take the time to investigate you will notice the assembler code
that
> gets produced when you make this call. Better yet you could have just read
> the MSDN entry on microsoft's website and it would have told you how this
> function works. Functionally it works the same way as the function I
wrote.
> It checks the clock ticks and compares them to see if the require time has
> lapse.
>
> The major difference is that my function is platform independent, and it
> does not require preprocessor commands. As you know, windows.h is only
> available on a windows platform. The function I wrote, requires only
time.h
> which is a c++ library.
>
> I will even take this one step further. If you compile these two programs,
> the sizes of the files are the same (16k), and the assembler code that is
> produced is almost Identical.
>
> Program 1:
> //Source code headers
> #include <time.h>
>
> //Main program function
> int main()
> {
>     //sleep command
>     unsigned int clockTicks;
>     clock_t ticksReached;
>
>     clockTicks = 3000;
>     ticksReached = clockTicks + clock();
>     while (ticksReached > clock());
>
>
>     //Exit program
>     return 0;
> }
>
> Program 2:
>
> //Source code headers
> #include <windows.h>
>
> //Main program function
> int main()
> {
>     //sleep command
>    Sleep(300);
>
>     //Exit program
>     return 0;
> }
>
> - Adam Jones
>
>
>
> -----Original Message-----
> From: matheus ribeiro [mailto:mfr...@gm...]
> Sent: Tuesday, July 24, 2007 12:32 AM
> To: Adam Jones
> Cc: Jamiil Abduqadir; Dev Cpp MailingLinst
> Subject: Re: [Dev-C++] sleep() for Windows XP
>
> But it also eats your cpu cycles... Sleep doest consume CPU.
>
> 2007/7/23, Adam Jones <aj...@i-...>:
> > Just in case you are interested, here is a platfrom independent way to
> cause
> > your program to sleep without using sleep() or MS version Sleep(). It
also
> > avoids preprocessors commands.
> >
> > #include <time.h>
> >
> > Int main()
> > {
> >
> >     unsigned int clockTicks;                            //Stores the
> amount
> > of time you want to pause execution in clock ticks
> >     clock_t ticksReached;                               //Stores the
> amount
> > of clock ticks
> >
> >     clockTicks = 3000;                          //set pause to 3 seconds
> >     ticksReached = clockTicks + clock();                //get number of
> > clocks tick since program started then add the addition wait time
> >     while (ticksReached > clock());             //loop until current
clock
> > ticks equal the ticks needed to wait
> >
> >    return 0;
> > }
> >
> > It is more code, but it is platfrom independent and free of preprocessor
> > commands.....
> >
> > -Adam Jones
> >
> >
> > -----Original Message-----
> > From: dev...@li...
> > [mailto:dev...@li...] On Behalf Of Adam
> Jones
> > Sent: Monday, July 23, 2007 10:24 PM
> > To: 'Jamiil Abduqadir'; 'Dev Cpp MailingLinst'
> > Subject: Re: [Dev-C++] sleep() for Windows XP
> >
> > >>You wrote:
> > >> Does anyone know where I can find a source code for such service, so
> that
> > it is a portable sleep() function?
> >
> > Why do you feel the need to cause your program to sleep(). There may be
> > other ways of pausing executive without using a platform dependent
> command.
> > Or using #defines. If you could provide more details, that may be
helpful.
> >
> > -Adam Jones
> >
> > From: dev...@li...
> > [mailto:dev...@li...] On Behalf Of Jamiil
> > Abduqadir
> > Sent: Monday, July 23, 2007 3:37 PM
> > To: Dev Cpp MailingLinst
> > Subject: [Dev-C++] sleep() for Windows XP
> >
> > Using GCC, I developed some small apps under Linux, now I am trying to
> port
> > this apps to MSWinXP, but there are some Unix functions that are not
> > availableunder MS, sleep() is one of them. Does anyone know where I can
> > find a source code for such service, so that it isa portable sleep()
> > function?
> >
> >
> >
> >
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Re: [Dev-C++] sleep() for Windows XP

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Re: [Dev-C++] sleep() for Windows XP