CentOS 7.0 - man page for tcl_sleep (centos section 3)
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Tcl_Sleep(3) Tcl Library Procedures Tcl_Sleep(3)_________________________________________________________________________________________________NAME
Tcl_Sleep - delay execution for a given number of milliseconds
int ms (in) Number of milliseconds to sleep.
This procedure delays the calling process by the number of milliseconds given by the ms
parameter and returns after that time has elapsed. It is typically used for things like
flashing a button, where the delay is short and the application need not do anything while
it waits. For longer delays where the application needs to respond to other events during
the delay, the procedure Tcl_CreateTimerHandler should be used instead of Tcl_Sleep.
sleep, time, wait
Tcl 7.5 Tcl_Sleep(3)