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From: friesen@psivax.UUCP (Stanley Friesen)
Newsgroups: net.unix-wizards
Subject: sub-second sleeps on BSD 4.2
Message-ID: <408@psivax.UUCP>
Date: Mon, 22-Apr-85 12:50:09 EST
Article-I.D.: psivax.408
Posted: Mon Apr 22 12:50:09 1985
Date-Received: Thu, 25-Apr-85 07:44:02 EST
Reply-To: friesen@psivax.UUCP (Stanley Friesen)
Organization: Pacesetter Systems Inc., Sylmar, CA
Lines: 35


	I am having trouble in writing a routine to handle less than
one second sleeps on BSD 4.2 using setitimer and sigpause. The routine
I am using is similar to the code for sleep().  My problem, it keeps
hanging sfter a random number of calls. It seems that eventually it
does not return from sigpause. Why? What can I do about it?
The code is as follows:

#include <sys/time.h> 
#include <signal.h>

int wakeup;

void nullfunc(){
    wakeup = 1;
}

struct itimerval tm = {{0, 0}, {0, 1500}};

delay()
{

    void nullfunc();

    signal(SIGALRM, nullfunc);
    wakeup = 0;
    if(setitimer(ITIMER_REAL, &tm, NULL)) exit(1);
    while(wakeup == 0) sigpause(0);
}
-- 

				Sarima (Stanley Friesen)

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