Re: Event loop and http::geturl

Am 26.06.25 um 23:02 schrieb et99:

I wonder, if you are reading a file that is being written from another process, sort of like a "tail" program, doesn't tcl's [fileevent <channel> readable <script>] trigger constantly? Isn't this in effect a tight polling loop?

The underlying mechanism is select() or poll(). To my knowledge, this only works for pipes/sockets, not for files. The "tail -f" program runs stat() in a loop to see if the file date or size has changed.
On Linux, you could also use inotify (there is a Tcl package) to get callbacks when the file is changed
      Christian