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RE: Widgets break CALL_EXT? [message #5728]

Fri, 02 February 1996 00:00

mallozzi
Messages: 60
Registered: August 1994

Member

> Your problem may be due to IDL's use of unix signals. I ran into a problem
> using CALL_EXTERNAL to perform network i/o. IDL uses signals for a variety
> of tasks. In particular, SIGALRM is used for all timing events. When
> X-windows is used, this timer is set to go off on a regular basis. What
> seems to happen is that if a system call (such as i/o) is done and is
> interrupted by SIGALRM, then the system call will not complete.
-SNIP-

Much thanks to Ken Knighton <knighton@gav.gat.com> for the key to the
solution to this problem. Sure enough, I wrote two little c subroutines
to block SIGALRM and then restore the default state of the handler after
CALL_EXTERNAL was finished, and presto!, everything worked :-)
In my opinion, this behavior is a bug under IDL widgets, and should be
fixed in a future IDL release. Thanks again, Ken

-Bob Mallozzi <mallozzi@ssl.msfc.nasa.gov>

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		RE: Widgets break CALL_EXT? By: mallozzi on Fri, 02 February 1996 00:00
		Re: Widgets break CALL_EXT? By: Ken Knighton on Thu, 01 February 1996 00:00

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