It is difficult to compare languages with operating systems on which those languages can be executed/evaluated. On systems that implement them, Tcl can use sel

It is difficult to compare languages with operating systems on which those languages can be executed/evaluated. On systems that implement them, Tcl can use select, epoll, kqueue for its event notification implementation, as well as pthread_cond_broadcast for threads (if built with thread support). take a look at: generic/tclNotify.c - https://core.tcl.tk/tcl/artifact/8804164706c8f2cb https://core.tcl.tk/tcl/artifact/8804164706c8f2cb unix/tclEpollNotfy.c - https://core.tcl.tk/tcl/artifact/892b68fa5a7c4c87 https://core.tcl.tk/tcl/artifact/892b68fa5a7c4c87