Tcl_CreateTimerHandler(3) Tcl Library Procedures Tcl_CreateTimerHandler(3) 







Tcl_CreateTimerHandler, Tcl_DeleteTimerHandler - call a procedure
    at a given time








#include <tcl.h>

Tcl_TimerToken
Tcl_CreateTimerHandler(milliseconds, proc, clientData)

Tcl_DeleteTimerHandler(token)









  
int milliseconds (in)

  
How many milliseconds to wait before invoking proc.

  
Tcl_TimerProc *proc (in)

  
Procedure to invoke after milliseconds have elapsed.

  
ClientData clientData (in)

  
Arbitrary one-word value to pass to proc.

  
Tcl_TimerToken token (in)

  
Token for previously created timer handler (the return value from some
      previous call to Tcl_CreateTimerHandler).
    
    

    

  










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 is not 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);



The clientData parameter to proc is a copy of the
  clientData argument given to Tcl_CreateTimerHandler when the
  callback was created. Typically, clientData points to a data structure
  containing application-specific information about what to do in proc.

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.










callback, clock, handler, timer







  

    7.5
    Tcl