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Ruby/Tk does NOT support forking the process on which Tk interpreter
is running (unless NEVER control Tk interpreter under the forked child
process). In the library 'tk.rb', a Tk interpreter is initialized.
Therefore, if you want running Tk under a child process, please call
"require 'tk'" in the child process.
For example, the following sample1 will NOT work, and sample2 will
work properly.
---<sample1: NOT work>---------------------------------------
require 'tk' ## init Tk interpreter under parent process
exit! if fork ## exit parent process
## child process
TkButton.new(:text=>'QUIT', :command=>proc{exit}).pack
Tk.mainloop
-------------------------------------------------------------
---<sample2: will work>--------------------------------------
exit! if fork ## exit main process
## child process
require 'tk' ## init Tk interpreter under child process
TkButton.new(:text=>'QUIT', :command=>proc{exit}).pack
Tk.mainloop
-------------------------------------------------------------
2004/04/20 Hidetoshi NAGAI
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