Hi, tcl-8.4.3 has been released today.
You can read the announcement, release notes and changelog too.
This release fixes a multithreading issue, which boiled down to tcl's "cd" command not being thread-safe. While most users didn't notice (because they didn't use cd in threads), aolserver cds a lot, so we noticed :)
Also, an issue that occured in tcl-8.4.0 and was fixed in tcl-8.4.2 involved an erroneous status code from "catch".
(details: the problem was that the return value of catch was TCL_OK (0) when it should have been TCL_RETURN (2) when encountering a return statement.)
Thanks to Mark Dalrymple for tracing the problem he saw to catch; I then asked the tcl people if that was a known issue, and it was. This issue affected openacs because it checks some invocations of catch for return value of 2 in db_exec and friends. A suggestion was made that the sense of the test be reversed, and the code should check for TCL_ERROR (1) instead. This way, the important condition (error occured) is tested for, not whether or not a return statement was encountered in the catch block. Thanks to RockShox on freenode irc's #tcl channel for that suggestion.
