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CentOS 7.0 - man page for tcl_callwhendeleted (centos section 3)

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Tcl_CallWhenDeleted(3)		      Tcl Library Procedures		   Tcl_CallWhenDeleted(3)


       Tcl_CallWhenDeleted,  Tcl_DontCallWhenDeleted  -  Arrange for callback when interpreter is

       #include <tcl.h>

       Tcl_CallWhenDeleted(interp, proc, clientData)

       Tcl_DontCallWhenDeleted(interp, proc, clientData)

       Tcl_Interp *interp (in)			     Interpreter with which to	associated  call-

       Tcl_InterpDeleteProc *proc (in)		     Procedure to call when interp is deleted.

       ClientData clientData (in)		     Arbitrary one-word value to pass to proc.

       Tcl_CallWhenDeleted  arranges  for proc to be called by Tcl_DeleteInterp if/when interp is
       deleted at some future time.  Proc will be invoked just before the interpreter is deleted,
       but  the  interpreter will still be valid at the time of the call.  Proc should have argu-
       ments and result that match the type Tcl_InterpDeleteProc:
	      typedef void Tcl_InterpDeleteProc(
		      ClientData clientData,
		      Tcl_Interp *interp);
       The clientData and interp parameters are copies of the  clientData  and	interp	arguments
       given  to  Tcl_CallWhenDeleted.	 Typically,  clientData points to an application-specific
       data structure that proc uses to perform cleanup when an interpreter is about to go  away.
       Proc does not return a value.

       Tcl_DontCallWhenDeleted cancels a previous call to Tcl_CallWhenDeleted with the same argu-
       ments, so that proc will not be called after all when interp is deleted.  If there  is  no
       deletion callback that matches interp, proc, and clientData then the call to Tcl_DontCall-
       WhenDeleted has no effect.

       callback, delete, interpreter

Tcl					       7.0			   Tcl_CallWhenDeleted(3)
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