[ale] Mixing Alarm and Sleep

Mon Jan 21 15:05:36 EST 2002

Chris Fowler wrote:
> 
> Ah!  I'm having some issues using the alarm() call and the sleep() call in the same program.  The alarm call is in a library function.  Basically, another piece of source code.  It uses the alarm to timeout on sending
> and receiveing data over udp.   I nede to loop and sleep for 30 seconds.    The sleep is not sleeping for 30 seconds.   Bacically it would look like this.

>From the RH 6.2 man pages for sleep (man 3c sleep):

BUGS
       sleep() may be implemented using SIGALRM; mixing calls  to
       alarm() and sleep() is a bad idea.

Basically, sleep may use SIGALRM to wake up, so your calls to alarm() are
interfering.

-- 
Pete Hardie                   |   Goalie, DVSG Dart Team
    posting from, but not     |
	speaking for:             |
Scientific Atlanta, Digital Video Services Group

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