diff options
Diffstat (limited to 'doc/unload.n')
| -rw-r--r-- | doc/unload.n | 33 |
1 files changed, 24 insertions, 9 deletions
diff --git a/doc/unload.n b/doc/unload.n index 916c565..b0aab2e 100644 --- a/doc/unload.n +++ b/doc/unload.n @@ -4,7 +4,7 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: unload.n,v 1.3 2004/03/17 18:14:12 das Exp $ +'\" RCS: @(#) $Id: unload.n,v 1.4 2004/05/30 14:25:51 dkf Exp $ '\" .so man.macros .TH unload n 8.5 Tcl "Tcl Built-In Commands" @@ -27,11 +27,13 @@ with \fBload\fR from the application's address space. \fIfileName\fR is the name of the file containing the library file to be unload; it must be the same as the filename provided to \fBload\fR for loading the library. -\fIpackageName\fR is the name of the package, and is used to -compute the name of the unload procedure. -\fIinterp\fR is the path name of the interpreter from which to unload -the package (see the \fBinterp\fR manual entry for details); -if \fIinterp\fR is omitted, it defaults to the +The \fIpackageName\fR argument is the name of the package (as +determined by or passed to \fBload\fR), and is used to +compute the name of the unload procedure; if not supplied, it is +computed from \fIfileName\fR in the same manner as \fBload\fR. +The \fIinterp\fR argument is the path name of the interpreter from +which to unload the package (see the \fBinterp\fR manual entry for +details); if \fIinterp\fR is omitted, it defaults to the interpreter in which the \fBunload\fR command was invoked. .LP If the initial arguments to \fBunload\fR start with \fB\-\fR then @@ -120,7 +122,6 @@ alphabetic and underline characters as the module name. For example, the command \fBunload libxyz4.2.so\fR uses the module name \fBxyz\fR and the command \fBunload bin/last.so {}\fR uses the module name \fBlast\fR. - .SH "PORTABILITY ISSUES" .TP \fBUnix\fR\0\0\0\0\0 @@ -128,7 +129,6 @@ module name \fBlast\fR. Not all unix operating systems support library unloading. Under such an operating system \fBunload\fR returns an error (unless -nocomplain has been specified). - .SH BUGS .PP If the same file is \fBload\fRed by different \fIfileName\fRs, it will @@ -139,9 +139,24 @@ silently detached by the operating system (and as a result Tcl thinks the library is still loaded), it may be dangerous to use \fBunload\fR on such a library (as the library will be completely detached from the application while some interpreters will continue to use it). +.SH EXAMPLE +If an unloadable module in the file \fBfoobar.dll\fR had been loaded +using the \fBload\fR command like this (on Windows): +.CS +load c:/some/dir/foobar.dll +.CE +then it would be unloaded like this: +.CS +\fBunload\fR c:/some/dir/foobar.dll +.CE +.PP +This allows a C code module to be installed temporarily into a +long-running Tcl program and then removed again (either because it is +no longer needed or because it is being updated with a new version) +without having to shut down the overall Tcl process. .SH "SEE ALSO" -info sharedlibextension, load, safe(n) +info sharedlibextension, load(n), safe(n) .SH KEYWORDS binary code, unloading, safe interpreter, shared library |