ext/tcltklib/tcltklib.c:

 * replace Tcl/Tk's vwait and tkwait to switch on threads smoothly and
   avoid seg-fault.
 * add TclTkIp._thread_vwait and _thread_tkwait for waiting on a thread.
   ( Because Tcl/Tk's vwait and tkwait command wait on a eventloop. )
ext/tk/lib/multi-tk.rb:
 * support TclTkIp._thread_vwait and _thread_tkwait
ext/tk/lib/tk.rb:
 * now, TkVariable#wait has 2 arguments.
   If 1st argument is true, waits on a thread. If false, waits on an eventloop.
   If 2nd argument is true, checks existence of rootwidgets. If false, doesn't.
   Default is wait(true, false).
 * add TkVariable#tkwait(arg) which is equal to TkVariable#wait(arg, true)
 * wait_visibility and wait_destroy have an argument for waiting on a
   thread or an eventloop.
 * improve of accessing Tcl/Tk's special variables
ext/tk/lib/tkafter.rb:
 * support 'wait on a thread' and 'wait on an eventloop'


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4762 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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