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+ 4. Threads. If configured with the --enable-threads flag, Tcl can
+ now be compiled for use in a multi-threaded application.
+ Individual threads are allowed to use one or more interpreters as
+ long as each interpreter (and any slave interpreters) is only
+ accessed by one thread. Each thread runs its own event loop, and
+ you can post events to other threads. There are new C APIs for
+ mutexes, condition variables, and thread local storage. See the
+ doc/Thread.3 manual entry for more details. Tk 8.1 is not yet
+ multi-thread safe. There is not yet support for tcl level use of
+ threading except for a test command. (Compile tcltest and try
+ testthread.)
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