[LCP]Help in Parallel tasks

[Mohd Saifullah]

Yes, i have used semaphores. But i can use them before or after the "ping" 
only. What i need is: during "ping". 

Regards,
Saif

On Thu, 21 Nov 2002, Andrew Weaver wrote:

> Well, these are not "threads". Have you explored semaphores? 
> 
> On Thursday, November 21, 2002 6:14 AM, Mohd Saifullah
> [SMTP:saif at lantana.tenet.res.in] wrote:
> > 
> > Hello,
> > 
> > I am appending the code that i am trying out (this time with processes).
> > 
> > main()
> > {
> >   int upid;
> >   upid =  fork();
> >   if(upid == 0)
> >     {
> >       system("snmpget localhost public .1.3.6.1.2.1.2.2.1.10.2 > file1");
> 
> >       usleep(1000000);
> >       system("snmpget localhost public .1.3.6.1.2.1.2.2.1.10.2 >> file1");
> >       exit(0);
> >     }
> >   else
> >     {
> >     system("ping -i 0.01 -c 100 -s 954 -q fileserver > pingout");
> >     }
> > }
> > 
> > My exact requirement is: the first snmpget of child process has to be
> > executed little after parent process starts "ping". And also the second
> > snmpget of child process has to run before parent process stops pingning.
> > 
> > Any idea, please?
> > 
> > Regards,
> > Saif 
> > 
> > 
> >  On Wed, 20 Nov 2002, David wrote:
> > 
> > > Mohd Saifullah wrote:
> > > > Greetings to All!
> > > > 
> > > > I have written two threads (Linux pthreads). One thread does "ping"ing
> for
> > > > two to three secs. The other thread has to note down the interface
> traffic
> > > > count at the beginning of the pinging and also at the end of it, so
> this
> > > > thread has 2 secs sleep in between the two readings. But the problem
> is:  
> > > > first thread is executed completely and then control comes to second 
> > > > thread. But i want control to switch from first thread to second
> thread as
> > > > soon as first one starts pinging.
> > > > 
> > > > Thanks in advance,
> > > > Saif
> > > > 
> > > 
> > > Have you thought using a condition variable?  You could use it make the 
> > > first thread signal the second and wait until the second thread
> completes.
> > > The second thread could then signal the first when it is finished.
> > > 
> > > 
> > 
> > _______________________________________________
> > This is the Linux C Programming List
> > :  http://lists.linux.org.au/listinfo/linuxcprogramming List
> _______________________________________________
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