Timer application in linux

Special Forums UNIX and Linux Applications Timer application in linux

12-29-2011

Registered User

2, 0

Join Date: Dec 2011

Last Activity: 5 January 2012, 7:23 AM EST

Posts: 2

Thanks Given: 0

Thanked 0 Times in 0 Posts

Timer application in linux

Hello everyone,
It is good to be here.
I am a newbie to Linux.Can anyone help me in designing a timer application.
The timer has to start.And after certain time interval the program should call a function continuously.It should not be in sleep mode.During the course of that time interval the program should execute the rest of the functions or statements.

Plz help me in doing so...thanx in advance

Harry443

View Public Profile for Harry443

Find all posts by Harry443

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Programming

creating an application with gui in linux

hi, so I am familiar with visual studio for windows, I was wondering if there's that kind of IDE for linux that I can use to make an application... thanks!

2. Shell Programming and Scripting

Linux newbie scripting help needed (timer)

Hi, Newbie to Linux needing some help with scripting, here. I've written a script that allows easily shutting down, rebooting, or exiting to terminal mode via a Dialog menu after logging out of X-server. In my .bash_profile I have startx followed by running my script, shutdownmenu.sh, and it...

3. UNIX and Linux Applications

Linux application upgrade ways

Hello. I need upgrade memcached. This software is installed throuth yum. In official repositories isn`t newest version of memcached, but this one is vulnerable. So looks like I need built it from source, but I dont really want to install c libraries un compilers on system. 1.) So can I compile...

4. Programming

Application Cleanup during Linux Shutdown

I'm trying to do some cleanup (write open files) when Linux shuts down. I thought the right method would be to trap SIGTERM and do the necessary processing. Here's my sample code: #include <stdio.h> // for File I/O #include <signal.h> // for signals #include <unistd.h> // for sleep() void...

5. Advertise with Us

Wanted- Linux Application Engineers

Optiver US LLC is a worldwide market maker and derivatives trading firm with offices in Chicago, Amsterdam and Sydney. Attracting very ambitious, talented and results-oriented individuals to become members of a highly selective trading application engineering team. This position is a primary...

6. AIX

Migrating C Application from AIX to Linux

Hi All, I am currently facing new problem of migrating C(c language) application from AIX machine to Linux machine. We are using GCC to compile the source code.. But facing with the compilation issues, with lot of GCC C libs differing between AIX box to Linux box... Pls help me...

7. Linux

Socket communication and timer application

tcp communication application i have an application which run in 1) while() {in } and listens for some request When a request comes to create a file(containing some data fetch from somewhere) but i also want to start some timer that after 10/20 min delete that file But i don't know how...

8. UNIX for Dummies Questions & Answers

socket communication and timer application

i need to develop application which continuously wait for a request from multiple host and on receiving a request on that need to create a log file and after 30 mins delete that file I am new to socket programming so could anyone help me on this. How to continuously listen for a request How...

9. SCO

SCO 5.0.6 application compatibility w/ Linux?

Hello Valued Members, I was wondering if there are any Linux, BSD, versions that can run SCO 5.0.6 applications without much modification? I was looking into purchasing a copy of Caldera Openlinux, the last version, but wanted to ask if there are any other options of a newer variant. I am also...

10. Programming

Porting Win32 application into Linux

I need port Win32 console application, which was developed with MS Visual Studio 6.0 (without MFC using) into Linux. What is the best way to port project? Are there any standard tools or decisions? Thank you in advance, Sergey

LEARN ABOUT LINUX

timer_getoverrun

TIMER_GETOVERRUN(2)					     Linux Programmer's Manual					       TIMER_GETOVERRUN(2)

NAME

       timer_getoverrun - get overrun count for a POSIX per-process timer

SYNOPSIS

       #include <time.h>

       int timer_getoverrun(timer_t timerid);

       Link with -lrt.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       timer_getoverrun(): _POSIX_C_SOURCE >= 199309L

DESCRIPTION

       timer_getoverrun()  returns  the  "overrun  count" for the timer referred to by timerid.  An application can use the overrun count to accu-
       rately calculate the number of timer expirations that would have occurred over a given time interval.  Timer overruns can occur	both  when
       receiving expiration notifications via signals (SIGEV_SIGNAL), and via threads (SIGEV_THREAD).

       When  expiration  notifications are delivered via a signal, overruns can occur as follows.  Regardless of whether or not a real-time signal
       is used for timer notifications, the system queues at most one signal per timer.  (This is the behavior	specified  by  POSIX.1-2001.   The
       alternative,  queuing one signal for each timer expiration, could easily result in overflowing the allowed limits for queued signals on the
       system.)  Because of system scheduling delays, or because the signal may be temporarily blocked, there can be a delay between the time when
       the notification signal is generated and the time when it is delivered (e.g., caught by a signal handler) or accepted (e.g., using sigwait-
       info(2)).  In this interval, further timer expirations may occur.  The timer overrun count is the number of  additional	timer  expirations
       that occurred between the time when the signal was generated and when it was delivered or accepted.

       Timer overruns can also occur when expiration notifications are delivered via invocation of a thread, since there may be an arbitrary delay
       between an expiration of the timer and the invocation of the notification thread, and in that delay interval, additional timer  expirations
       may occur

RETURN VALUE

       On  success,  timer_getoverrun()  returns  the  overrun count of the specified timer; this count may be 0 if no overruns have occurred.	On
       failure, -1 is returned, and errno is set to indicate the error.

ERRORS

       EINVAL timerid is not a valid timer ID.

VERSIONS

       This system call is available since Linux 2.6.

CONFORMING TO

       POSIX.1-2001

NOTES

       When timer notifications are delivered via signals (SIGEV_SIGNAL), on Linux it is also  possible  to  obtain  the  overrun  count  via  the
       si_overrun  field  of the siginfo_t structure (see sigaction(2)).  This allows an application to avoid the overhead of making a system call
       to obtain the overrun count, but is a nonportable extension to POSIX.1-2001.

       POSIX.1-2001 only discusses timer overruns in the context of timer notifications using signals.

BUGS

       POSIX.1-2001 specifies that if the timer overrun count is equal to or greater than an implementation-defined maximum, DELAYTIMER_MAX,  then
       timer_getoverrun()  should  return  DELAYTIMER_MAX.   However,  Linux  does not implement this feature: instead, if the timer overrun value
       exceeds the maximum representable integer, the counter cycles, starting once more from low values.

EXAMPLE

       See timer_create(2).

SEE ALSO

       clock_gettime(2), sigaction(2), signalfd(2), sigwaitinfo(2), timer_create(2), timer_delete(2), timer_settime(2), signal(7), time(7)

COLOPHON

       This page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2009-02-20						       TIMER_GETOVERRUN(2)

UNIX and Linux Applications