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The shared library did not include a destructor for the thread-specific data key

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on UNIX-based operating systems (STR #103)
This commit is contained in:
Michael R Sweet 2010-09-19 04:56:51 +00:00
parent a2beacb1b7
commit 3f31a993f7
1 changed files with 60 additions and 12 deletions
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72
mxml-private.c
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@ -3,7 +3,7 @@
*
* Private functions for Mini-XML, a small XML-like file parsing library.
*
* Copyright 2003-2007 by Michael Sweet.
* Copyright 2003-2010 by Michael Sweet.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@ -31,6 +31,33 @@
#include "mxml-private.h"
/*
* Some crazy people think that unloading a shared object is a good or safe
* thing to do. Unfortunately, most objects are simply *not* safe to unload
* and bad things *will* happen.
*
* The following mess of conditional code allows us to provide a destructor
* function in Mini-XML for our thread-global storage so that it can possibly
* be unloaded safely, although since there is no standard way to do so I
* can't even provide any guarantees that you can do it safely on all platforms.
*
* This code currently supports AIX, HP-UX, Linux, Mac OS X, Solaris, and
* Windows. It might work on the BSDs and IRIX, but I haven't tested that.
*/
#if defined(__sun) || defined(_AIX)
# pragma fini(_mxml_fini)
# define _MXML_FINI _mxml_fini
#elif defined(__hpux)
# pragma FINI _mxml_fini
# define _MXML_FINI _mxml_fini
#elif defined(__GCC__) /* Linux and Mac OS X */
# define _MXML_FINI __attribute((destructor)) _mxml_fini
#else
# define _MXML_FINI _fini
#endif /* __sun */
/*
* 'mxml_error()' - Display an error message.
*/
@ -135,6 +162,38 @@ static void _mxml_init(void);
static void _mxml_destructor(void *g);
/*
* '_mxml_destructor()' - Free memory used for globals...
*/
static void
_mxml_destructor(void *g) /* I - Global data */
{
free(g);
}
/*
* '_mxml_fini()' - Clean up when unloaded.
*/
static void
_MXML_FINI(void)
{
_mxml_global_t *global; /* Global data */
if (_mxml_key != -1)
{
if ((global = (_mxml_global_t *)pthread_getspecific(_mxml_key)) != NULL)
_mxml_destructor(global);
pthread_key_delete(_mxml_key);
_mxml_key = -1;
}
}
/*
* '_mxml_global()' - Get global data.
*/
@ -172,17 +231,6 @@ _mxml_init(void)
}
/*
* '_mxml_destructor()' - Free memory used for globals...
*/
static void
_mxml_destructor(void *g) /* I - Global data */
{
free(g);
}
#elif defined(WIN32) /**** WIN32 threading ****/
# include <windows.h>