mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-22 19:00:07 +00:00
63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
|
/* _longjmp_unwind -- Clean up stack frames unwound by longjmp. Hurd version.
|
||
|
|
Copyright (C) 1995 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
|
||
|
|
modify it under the terms of the GNU Library General Public License as
|
||
|
|
published by the Free Software Foundation; either version 2 of the
|
||
|
|
License, or (at your option) any later version.
|
||
|
|
|
||
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
Library General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library General Public
|
||
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
||
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
||
|
|
Cambridge, MA 02139, USA. */
|
||
|
|
|
||
|
|
#include <setjmp.h>
|
||
|
|
#include <hurd/signal.h>
|
||
|
|
#include <hurd/userlink.h>
|
||
|
|
#include <assert.h>
|
||
|
|
|
||
|
|
/* This function is called by `longjmp' (with its arguments) to restore
|
||
|
|
active resources to a sane state before the frames code using them are
|
||
|
|
jumped out of. */
|
||
|
|
|
||
|
|
void
|
||
|
|
_longjmp_unwind (jmp_buf env, int val)
|
||
|
|
{
|
||
|
|
struct hurd_sigstate *ss = _hurd_self_sigstate ();
|
||
|
|
struct hurd_userlink *link;
|
||
|
|
|
||
|
|
/* All access to SS->active_resources must take place inside a critical
|
||
|
|
section where signal handlers cannot run. */
|
||
|
|
__spin_lock (&ss->lock);
|
||
|
|
assert (! ss->critical_section);
|
||
|
|
ss->critical_section = 1;
|
||
|
|
__spin_unlock (&ss->lock);
|
||
|
|
|
||
|
|
#ifndef _JMPBUF_UNWINDS
|
||
|
|
#error "sysdeps/MACHINE/jmp_buf.h fails to define _JMPBUF_UNWINDS"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Iterate over the current thread's list of active resources.
|
||
|
|
Process the head portion of the list whose links reside
|
||
|
|
in stack frames being unwound by this jump. */
|
||
|
|
|
||
|
|
for (link = ss->active_resources;
|
||
|
|
link && _JMPBUF_UNWINDS (env[0].__jmpbuf, link);
|
||
|
|
link = link->thread.next)
|
||
|
|
/* Remove this link from the resource's users list,
|
||
|
|
since the frame using the resource is being unwound.
|
||
|
|
This call returns nonzero if that was the last user. */
|
||
|
|
if (_hurd_userlink_unlink (link))
|
||
|
|
/* One of the frames being unwound by the longjmp was the last user
|
||
|
|
of its resource. Call the cleanup function to deallocate it. */
|
||
|
|
(*link->cleanup) (link->cleanup_data, env, val);
|
||
|
|
|
||
|
|
_hurd_critical_section_unlock (ss);
|
||
|
|
}
|