Training, Open Source computer languages
PerlPHPPythonMySQLApache / TomcatTclRubyJavaC and C++LinuxCSS 
Search for:
Home Accessibility Courses Diary The Mouth Forum Resources Site Map About Us Contact
This week, we're updating our course layouts and descriptions. Presentation and materials always gently change over time, but just occasionally there's a need to make a step change to clear out some of the old and roll in the new. That's now happening - but over a long and complex site it's not instant and you'll see sections of the site changing up to and including 19th September.

See also [here] for status update
How to call a proc and not wait for it's return

Posted by smiller1971 (smiller1971), 4 October 2007
i have a foreach loop that calls a procedure. The foreach loop seems to stop until the procedure returns.  Is there a way to change this behavior? I'm using tcl 8.4.15

Thanks in advance!


Posted by admin (Graham Ellis), 5 October 2007
Steve, this is standard programming practise - when a subroutine / fucntion / macro / proc / method / command is called, the calling program waits for it to complete its actions before carrying on.   99% of the time that's what you want, as the code that carried on usually relies on the actions taken and results returned by the proc.

In those rare cases taht you want different behaviour, you can do so using spawn with the expect extension, or with something like an interp for multiple interpretters.  Beware - the syncronsation of multiple threads is quite tricky programming!

This page is a thread posted to the opentalk forum at and archived here for reference. To jump to the archive index please follow this link.

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2014: Well House Manor • 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • FAX: 01144 1225 899360 • EMAIL: • WEB: • SKYPE: wellho