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124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
/* Copyright (C) 1999, 2001, 2002, 2005, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <stdlib.h>
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#include <bits/libc-lock.h>
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#include "exit.h"
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#include <atomic.h>
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#include <sysdep.h>
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#undef __cxa_atexit
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/* Register a function to be called by exit or when a shared library
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is unloaded. This function is only called from code generated by
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the C++ compiler. */
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int
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__cxa_atexit (void (*func) (void *), void *arg, void *d)
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{
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struct exit_function *new = __new_exitfn ();
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if (new == NULL)
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return -1;
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#ifdef PTR_MANGLE
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PTR_MANGLE (func);
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#endif
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new->func.cxa.fn = (void (*) (void *, int)) func;
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new->func.cxa.arg = arg;
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new->func.cxa.dso_handle = d;
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atomic_write_barrier ();
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new->flavor = ef_cxa;
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return 0;
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}
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INTDEF(__cxa_atexit)
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/* We change global data, so we need locking. */
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__libc_lock_define_initialized (static, lock)
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static struct exit_function_list initial;
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struct exit_function_list *__exit_funcs = &initial;
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uint64_t __new_exitfn_called;
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struct exit_function *
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__new_exitfn (void)
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{
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struct exit_function_list *p = NULL;
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struct exit_function_list *l;
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struct exit_function *r = NULL;
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size_t i = 0;
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__libc_lock_lock (lock);
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for (l = __exit_funcs; l != NULL; p = l, l = l->next)
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{
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for (i = l->idx; i > 0; --i)
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if (l->fns[i - 1].flavor != ef_free)
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break;
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if (i > 0)
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break;
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/* This block is completely unused. */
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l->idx = 0;
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}
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if (l == NULL || i == sizeof (l->fns) / sizeof (l->fns[0]))
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{
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/* The last entry in a block is used. Use the first entry in
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the previous block if it exists. Otherwise create a new one. */
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if (p == NULL)
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{
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assert (l != NULL);
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p = (struct exit_function_list *)
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calloc (1, sizeof (struct exit_function_list));
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if (p != NULL)
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{
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p->next = __exit_funcs;
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__exit_funcs = p;
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}
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}
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if (p != NULL)
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{
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r = &p->fns[0];
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p->idx = 1;
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}
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}
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else
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{
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/* There is more room in the block. */
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r = &l->fns[i];
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l->idx = i + 1;
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}
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/* Mark entry as used, but we don't know the flavor now. */
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if (r != NULL)
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{
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r->flavor = ef_us;
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++__new_exitfn_called;
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}
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__libc_lock_unlock (lock);
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return r;
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}
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