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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
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!

Steve

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!



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