Tk Source Code

The function tkEventInit in generic/tkEvent.c

https://core.tcl-lang.org/tk/file?name=generic/tkEvent.c&ln=1010

unconditionally initialize all the fields of (ThreadSpecificData *)tsdPtr to 0 or NULL.

This is wrong since the function is called for each new interpreter in which Tk is loaded, effectively deleting all the information tsdPtr carries out for a given thread, resulting in memory leaks and other problems like wiping out callbacks registered by Tk_CreateGenericHandler(), etc.

This function should not be needed since the documentation for Tcl_GetThreadData reads "The storage is automatically allocated and initialized to all zeros the first time each thread asks for it."

Fixed by Jan today, see [df1a487a] and upward merges.