I create a TCL interp in a thread. And use Tcl_Eval to execute a script. But I want to
 exit the thread when I click one button.
So I use the Tcl_Trace to set a trace proc and receive the button message. But I cannot exit
 the TCL interp normally! In the Tcl_CreateTrace
doc, it shows:
"There is no way for the proc associated with a call to Tcl_CreateTrace to abort execution o
f command. "
I can only kill the thread directlly, but there mybe some memory leaks, for the interp is no
t freed with Tcl_InterpDelete.
How can I reach the target?

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