sleep

This is a discussion on sleep within the C Programming forums, part of the General Programming Boards category; hi all how can i sleep a command that is popen("xxxxxx","r"); to two seconds. i tried like this sleep(2) popen("xxxxxx","r"); ...

  1. #1
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    sleep

    hi all
    how can i sleep a command that is popen("xxxxxx","r");
    to two seconds.
    i tried like this
    sleep(2)
    popen("xxxxxx","r");

    but it is not waiting for 2 seconds. it is directly excuting.
    is there any command other than sleep() to wait for 2 seconds.

    please help me

    thank you in advance

  2. #2
    Math wizard
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    Sleep is in milliseconds. For 2 seconds, you'd have Sleep(2000) instead. Using Sleep for much longer than than a few dozen milliseconds isn't really recommended because it can delay the closing of a program. You could try using a timer instead of Sleep.
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    Quote Originally Posted by ulillillia View Post
    Sleep is in milliseconds. For 2 seconds, you'd have Sleep(2000) instead. Using Sleep for much longer than than a few dozen milliseconds isn't really recommended because it can delay the closing of a program. You could try using a timer instead of Sleep.
    yeah i tried but it saying,
    undefined reference to `Sleep'
    can u help me

    thank you in advance

  4. #4
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    Sleep is Windows function. Include Windows.h to use it. Also note that it is "Sleep" with the capital "S" as the first letter.

    What IDE/compiler do you use?
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    Quote Originally Posted by ulillillia View Post
    Sleep is Windows function. Include Windows.h to use it. Also note that it is "Sleep" with the capital "S" as the first letter.

    What IDE/compiler do you use?
    yeah!
    can use it in unix plz.

  6. #6
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    Unfortunately, I don't know anything about Unix (never even seen it either) so I can't help you there. Short of using a basic timer system, such as the clock() function, I don't have any other alternatives. For proper use, you'd set a starting time and adjust the current time in a loop and until the difference is what you want, then continue on. Here's some pseudo code to give the general idea:

    Code:
    long StartTime, CurrentTime, EndTime;
    
    StartTime = clock(); // set the starting time
    CurrentTime = StartTime;
    EndTime = StartTime + 2000; // 2000 milliseconds or 2 seconds
    
    while (CurrentTime < EndTime) // loop until the ending time is reached
    {
    	CurrentTime=clock();
    }
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  7. #7
    Captain Crash brewbuck's Avatar
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    Uhm. How about sleeping AFTER the call to popen()?

  8. #8
    and the hat of int overfl Salem's Avatar
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    Why do you think you need to sleep after calling popen() ?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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    Quote Originally Posted by ulillillia View Post
    Unfortunately, I don't know anything about Unix (never even seen it either) so I can't help you there. Short of using a basic timer system, such as the clock() function, I don't have any other alternatives. For proper use, you'd set a starting time and adjust the current time in a loop and until the difference is what you want, then continue on. Here's some pseudo code to give the general idea:

    Code:
    long StartTime, CurrentTime, EndTime;
    
    StartTime = clock(); // set the starting time
    CurrentTime = StartTime;
    EndTime = StartTime + 2000; // 2000 milliseconds or 2 seconds
    
    while (CurrentTime < EndTime) // loop until the ending time is reached
    {
    	CurrentTime=clock();
    }
    how can i use this to wait 2 seconds in my program.
    can you please help me
    thank you in advance

  10. #10
    Its hard... But im here swgh's Avatar
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    According to my compiler help files:

    C++ -> Sleep(2000);
    C -> sleep(2000);

    The capital makes a diiference
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    Quote Originally Posted by swgh View Post
    According to my compiler help files:

    C++ -> Sleep(2000);
    C -> sleep(2000);

    The capital makes a diiference
    i am sorry to say it is not working.
    i am using this sleep() in some other function (not in main())
    is this any problem?

    help me.
    thank you in advacne

  12. #12
    Its hard... But im here swgh's Avatar
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    This waits for two seconds:

    Code:
    #include <stdio.h>
    #include <windows.h> /*to define sleep()*/
    
    int main ( void )
    {
       sleep(2000);  /*wait 2 seconds*/
       printf("Now you can see this\n");
    
       getchar();
    
       return 0;
    }
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    Quote Originally Posted by swgh View Post
    This waits for two seconds:

    Code:
    #include <stdio.h>
    #include <windows.h> /*to define sleep()*/
    
    int main ( void )
    {
       sleep(2000);  /*wait 2 seconds*/
       printf("Now you can see this\n");
    
       getchar();
    
       return 0;
    }
    in my program the sleep() is not belongs to main().
    if i use sleep in main it is working fine but other than main it is not.

    help me

    thank you in advance

  14. #14
    Its hard... But im here swgh's Avatar
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    As longs you #include <windows.h> in your program before you use sleep() it should work. Does your compiler have the windows.h library? What compiler are you using, as it is OS an compiler specific
    I'm just trying to be a better person - My Name Is Earl

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    Quote Originally Posted by swgh View Post
    As longs you #include <windows.h> in your program before you use sleep() it should work. Does your compiler have the windows.h library? What compiler are you using, as it is OS an compiler specific
    am doing my program in unix, i think this the problem.

    thank you in advance

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