Question

delay function

Asked by: RedAlert999

someone knows how to make a delay() function, nut not using C++ commands?!?

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Asked On
2003-06-08 at 04:35:43ID20640783
Tags

delay

,

function

,

c

Topic

C Programming Language

Participating Experts
5
Points
50
Comments
10

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Answers

 

by: akshayxxPosted on 2003-06-08 at 05:11:12ID: 8676073

that means u dont want to use the standard function sleep() ??
then u got to use combination of  alarm() and SIGALRM signal handler..

 

by: ExceterPosted on 2003-06-08 at 11:12:17ID: 8677242

If you actually want to write a delay function you can do it easily with the clock function found in time.h. For example,

void delay( int seconds )
{
      clock_t start = clock();
      while( clock() < start + seconds * CLOCKS_PER_SEC );
}

...

delay(5); // Delay for 5 seconds.

Exceter

 

by: datibbaWPosted on 2003-06-10 at 08:44:05ID: 8691882

@Exceter: don't be an evil man :D pieces of code like that will definitely hang up your system in the end

The following code is perhaps a bit abusive to the system call i'm using, but it does the job without generating full CPU load:

#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

int delay(int secs)
{
  struct timeval tv;

  /* Wait up to five seconds. */
  tv.tv_sec = 5;
  tv.tv_usec = 0;

  select(0,NULL,NULL,NULL,&tv);
}

int main()
{
  delay(5);
  return 0;
}

 

by: AxterPosted on 2003-06-10 at 18:51:04ID: 8695816

datibbaW,
What OS and compiler are you using?

This code doesn't seem to work on Windows or DOS.

 

by: akshayxxPosted on 2003-06-10 at 20:13:13ID: 8696168

that must be any of the UNIX/LINUX systems ..  if u wannt make it work on windows u need to make few changes .. OR may be same code will compile as it is .on CYGWIN ( unix like environment and tools for windows)

 

by: datibbaWPosted on 2003-06-10 at 22:57:04ID: 8696839

Well yeah, I compiled it under Linux with gcc :D

You probably need to replace:
#include <unistd.h>

with:
#include <winsock.h>

Good luck!

 

by: AxterPosted on 2003-06-11 at 00:10:36ID: 8697188

>>You probably need to replace:
I figured that out, and I got it to compile, but it doesn't function in Windows.

I compiled it in VC++ 6.0 and with the GNU compiler.  Both fail to delay.

 

by: datibbaWPosted on 2003-06-11 at 00:39:26ID: 8697325

I don't know if the following will work, but I've just assumed that Windows won't be too peeved at throwing a zero handle in the following system call:

WaitForSingleObject(0,5000);

 

by: jmcgPosted on 2004-02-16 at 11:08:56ID: 10374694

Nothing has happened on this question in more than 8 months. It's time for cleanup!

My recommendation, which I will post in the Cleanup topic area, is to
split points between akshayxx {http:#8676073} & Exceter {http:#8677242}.

Please leave any comments here within the next four days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

jmcg
EE Cleanup Volunteer

20120131-EE-VQP-002

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