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'\"
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'\" Copyright (c) 1993 The Regents of the University of California.
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'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\" SCCS: @(#) CallDel.3 1.11 96/03/25 19:57:25
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'\"
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.so man.macros
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.TH Tcl_CallWhenDeleted 3 7.0 Tcl "Tcl Library Procedures"
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.BS
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.SH NAME
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Tcl_CallWhenDeleted, Tcl_DontCallWhenDeleted \- Arrange for callback when interpreter is deleted
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.SH SYNOPSIS
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.nf
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\fB#include <tcl.h>\fR
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.sp
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\fBTcl_CallWhenDeleted\fR(\fIinterp\fR, \fIproc\fR, \fIclientData\fR)
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.sp
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\fBTcl_DontCallWhenDeleted\fR(\fIinterp\fR, \fIproc\fR, \fIclientData\fR)
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.SH ARGUMENTS
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.AS Tcl_InterpDeleteProc clientData
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.AP Tcl_Interp *interp in
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Interpreter with which to associated callback.
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.AP Tcl_InterpDeleteProc *proc in
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Procedure to call when \fIinterp\fR is deleted.
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.AP ClientData clientData in
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Arbitrary one-word value to pass to \fIproc\fR.
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.BE
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.SH DESCRIPTION
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.PP
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\fBTcl_CallWhenDeleted\fR arranges for \fIproc\fR to be called by
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\fBTcl_DeleteInterp\fR if/when \fIinterp\fR is deleted at some future
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time. \fIProc\fR will be invoked just before the interpreter
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is deleted, but the interpreter will still be valid at the
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time of the call.
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\fIProc\fR should have arguments and result that match the
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type \fBTcl_InterpDeleteProc\fR:
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.CS
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typedef void Tcl_InterpDeleteProc(
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ClientData \fIclientData\fR,
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Tcl_Interp *\fIinterp\fR);
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.CE
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The \fIclientData\fR and \fIinterp\fR parameters are
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copies of the \fIclientData\fR and \fIinterp\fR arguments given
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to \fBTcl_CallWhenDeleted\fR.
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Typically, \fIclientData\fR points to an application-specific
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data structure that \fIproc\fR uses to perform cleanup when an
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interpreter is about to go away.
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\fIProc\fR does not return a value.
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.PP
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\fBTcl_DontCallWhenDeleted\fR cancels a previous call to
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\fBTcl_CallWhenDeleted\fR with the same arguments, so that
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\fIproc\fR won't be called after all when \fIinterp\fR is
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deleted.
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If there is no deletion callback that matches \fIinterp\fR,
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\fIproc\fR, and \fIclientData\fR then the call to
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\fBTcl_DontCallWhenDeleted\fR has no effect.
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.SH KEYWORDS
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callback, delete, interpreter
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