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ares_library_cleanup.3
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ares_library_cleanup.3
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.\"
.\" Copyright 1998 by the Massachusetts Institute of Technology.
.\" Copyright (C) 2004-2009 by Daniel Stenberg
.\"
.\" Permission to use, copy, modify, and distribute this
.\" software and its documentation for any purpose and without
.\" fee is hereby granted, provided that the above copyright
.\" notice appear in all copies and that both that copyright
.\" notice and this permission notice appear in supporting
.\" documentation, and that the name of M.I.T. not be used in
.\" advertising or publicity pertaining to distribution of the
.\" software without specific, written prior permission.
.\" M.I.T. makes no representations about the suitability of
.\" this software for any purpose. It is provided "as is"
.\" without express or implied warranty.
.\"
.TH ARES_LIBRARY_CLEANUP 3 "19 May 2009"
.SH NAME
ares_library_cleanup \- c-ares library deinitialization
.SH SYNOPSIS
.nf
.B #include <ares.h>
.PP
.B void ares_library_cleanup(void)
.PP
.B cc file.c -lcares
.fi
.SH DESCRIPTION
.PP
The
.B ares_library_cleanup
function uninitializes the c-ares library, freeing all resources
previously acquired by \fIares_library_init(3)\fP when the library
was initialized.
.PP
This function must be called when the program using c-ares will
no longer need any c-ares function. Once the program has called
\fIares_library_cleanup(3)\fP it shall not make any further call to any
c-ares function.
.PP
This function does not cancel any pending c-ares lookups or requests
previously done. Program must use \fIares_cancel(3)\fP for this purpose.
.PP
.B This function is not thread safe.
You have to call it once the program is about to terminate, but this call must
be done once the program has terminated every single thread that it could have
initiated. This is required to avoid potential race conditions in library
deinitialization, and also due to the fact that \fIares_library_cleanup(3)\fP
might call functions from other libraries that are thread unsafe, and could
conflict with any other thread that is already using these other libraries.
.PP
Win32/64 application DLLs shall not call \fIares_library_cleanup(3)\fP from
the DllMain function. Doing so will produce deadlocks and other problems.
.SH AVAILABILITY
This function was first introduced in c-ares version 1.7.0 along with the
definition of preprocessor symbol \fICARES_HAVE_ARES_LIBRARY_CLEANUP\fP as an
indication of the availability of this function.
.PP
Since the introduction of this function, it is absolutely mandatory to call it
for any Win32/64 program using c-ares.
.PP
Non-Win32/64 systems can still use c-ares version 1.7.0 without calling
\fIares_library_cleanup(3)\fP due to the fact that \fIcurrently\fP it is nearly
a do-nothing function on non-Win32/64 platforms.
.SH SEE ALSO
.BR ares_library_init(3),
.BR ares_cancel(3)
.SH AUTHOR
Yang Tse
.PP
Copyright 1998 by the Massachusetts Institute of Technology.
.br
Copyright (C) 2004-2009 by Daniel Stenberg.