Tcl_CreateTimerHandler, Tcl_DeleteTimerHandler - call a procedure at a given time
#include <tcl.h> Tcl_TimerToken Tcl_CreateTimerHandler(milliseconds, proc, clientData) Tcl_DeleteTimerHandler(token)
Tcl_CreateTimerHandler arranges for proc to be invoked at a time milliseconds milliseconds in the future. The callback to proc will be made by Tcl_DoOneEvent, so Tcl_CreateTimerHandler is only useful in programs that dispatch events through Tcl_DoOneEvent or through Tcl commands such as vwait. The call to proc may not be made at the exact time given by milliseconds: it will be made at the next opportunity after that time. For example, if Tcl_DoOneEvent isn't called until long after the time has elapsed, or if there are other pending events to process before the call to proc, then the call to proc will be delayed.
Proc should have arguments and return value that match the type Tcl_TimerProc:
typedef void Tcl_TimerProc(ClientData clientData);
Tcl_DeleteTimerHandler may be called to delete a previously-created timer handler. It deletes the handler indicated by token so that no call to proc will be made; if that handler no longer exists (e.g. because the time period has already elapsed and proc has been invoked then Tcl_DeleteTimerHandler does nothing. The tokens returned by Tcl_CreateTimerHandler never have a value of NULL, so if NULL is passed to Tcl_DeleteTimerHandler then the procedure does nothing.
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Created 1996-2023 by Maxim Chirkov
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