[TCLCORE] To the best of my recollection regarding TIP#302

[Christian W. <Chr...@t-...>]

Hello all,

some points to discuss:

* the clock domain should be switched from wall clock to a monotonic clock source in POSIX speak
* this should ideally not have an impact on time computations in Tcl core
* however, POSIX monotonic clock must be used in both clock_gettime() and condition variables
* maybe it's a good idea to detect availability of monotonic clock and fall back to wall clock if not available
* the time bound on slave interp evaluations is unfortunately in wall time which is IMO a failure in design
* what about virtual time, can this be ditched entirely, there ain't no test cases and no examples
* the "after -at" form is a special case to allow for cron like requirements, is this ever a use case?
* what is the resolution of "after -at", when it's like cron one second seems enough
* for symmetry another "after -mono" can be imagined which is like "after -at" but in the monotonic clock domain
* the resolution of "after -mono" should be near the tick rates of contemporary OSes (e.g. milliseconds)

Best regards,
Christian