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-rw-r--r--doc/Preserve.311
1 files changed, 10 insertions, 1 deletions
diff --git a/doc/Preserve.3 b/doc/Preserve.3
index 07c6476..b240022 100644
--- a/doc/Preserve.3
+++ b/doc/Preserve.3
@@ -5,7 +5,7 @@
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
-'\" RCS: @(#) $Id: Preserve.3,v 1.2 1998/09/14 18:39:49 stanton Exp $
+'\" RCS: @(#) $Id: Preserve.3,v 1.3 2001/12/13 00:58:26 hobbs Exp $
'\"
.so man.macros
.TH Tcl_Preserve 3 7.5 Tcl "Tcl Library Procedures"
@@ -89,6 +89,12 @@ The type of \fIblockPtr\fR (\fBchar *\fR) is different than the type of the
\fIclientData\fR argument to \fBTcl_EventuallyFree\fR for historical
reasons, but the value is the same.
.PP
+When the \fIclientData\fR argument to \fBTcl_EventuallyFree\fR
+refers to storage allocated and returned by a prior call to
+\fBTcl_Alloc\fR or another function of the Tcl library, then the
+\fIfreeProc\fR argument should be given the special value of
+\fBTCL_DYNAMIC\fR.
+.PP
This mechanism can be used to solve the problem described above
by placing \fBTcl_Preserve\fR and \fBTcl_Release\fR calls around
actions that may cause undesired storage re-allocation. The
@@ -99,5 +105,8 @@ The implementation does not depend in any way on the internal
structure of the objects being freed; it keeps the reference
counts in a separate structure.
+.SH "SEE ALSO"
+Tcl_Interp, Tcl_Alloc
+
.SH KEYWORDS
free, reference count, storage