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(__new_exitfn): Rewrite to preserve order in which the functions were registered.

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This commit is contained in:
Ulrich Drepper 2005-09-28 00:10:09 +00:00
parent e6f8907b08
commit b6caa3a615
1 changed files with 40 additions and 23 deletions
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63
stdlib/cxa_atexit.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
/* Copyright (C) 1999, 2001, 2002, 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -16,8 +16,10 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <bits/libc-lock.h>
#include <assert.h>
#include <stdlib.h>
#include <bits/libc-lock.h>
#include "exit.h"
#undef __cxa_atexit
@ -52,45 +54,60 @@ struct exit_function_list *__exit_funcs = &initial;
struct exit_function *
__new_exitfn (void)
{
struct exit_function_list *p = NULL;
struct exit_function_list *l;
struct exit_function *r = NULL;
size_t i = 0;
__libc_lock_lock (lock);
for (l = __exit_funcs; l != NULL; l = l->next)
for (l = __exit_funcs; l != NULL; p = l, l = l->next)
{
for (i = 0; i < l->idx; ++i)
if (l->fns[i].flavor == ef_free)
break;
if (i < l->idx)
for (i = l->idx; i > 0; --i)
if (l->fns[i - 1].flavor != ef_free)
break;
if (l->idx < sizeof (l->fns) / sizeof (l->fns[0]))
{
i = l->idx++;
if (i > 0)
break;
/* This block is completely unused. */
l->idx = 0;
}
if (l == NULL || i == sizeof (l->fns) / sizeof (l->fns[0]))
{
/* The last entry in a block is used. Use the first entry in
the previous block if it exists. Otherwise create a new one. */
if (p == NULL)
{
assert (l != NULL);
p = (struct exit_function_list *)
calloc (1, sizeof (struct exit_function_list));
if (p != NULL)
{
p->next = __exit_funcs;
__exit_funcs = p;
}
}
if (l == NULL)
if (p != NULL)
{
l = (struct exit_function_list *)
malloc (sizeof (struct exit_function_list));
if (l != NULL)
{
l->next = __exit_funcs;
__exit_funcs = l;
l->idx = 1;
i = 0;
r = &p->fns[0];
p->idx = 1;
}
}
else
{
/* There is more room in the block. */
r = &l->fns[i];
l->idx = i + 1;
}
/* Mark entry as used, but we don't know the flavor now. */
if (l != NULL)
l->fns[i].flavor = ef_us;
if (r != NULL)
r->flavor = ef_us;
__libc_lock_unlock (lock);
return l == NULL ? NULL : &l->fns[i];
return r;
}