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/* Deallocate the kernel thread resources. Viengoos version.
Copyright (C) 2007, 2008 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <assert.h>
#include <errno.h>
#include <pt-internal.h>
#include <hurd/exceptions.h>
#include <hurd/mutex.h>
#include <hurd/as.h>
#include <hurd/addr.h>
/* If we try to deallocate our self, we will end up causing a
deadlock. Thus, when a thread tries to free itself, we add it
here. The next thread to free a thread will free it. */
ss_mutex_t saved_object_lock;
static addr_t saved_object;
void
__pthread_thread_halt (struct __pthread *thread, int need_dealloc)
{
/* We may deallocate THREAD. First save any data we need. */
addr_t exception_area[EXCEPTION_AREA_SIZE / PAGESIZE];
memcpy (exception_area, thread->exception_area,
sizeof (thread->exception_area));
memset (thread->exception_area, 0, sizeof (thread->exception_area));
void *va = thread->exception_area_va;
addr_t object = thread->object;
l4_thread_id_t tid = thread->threadid;
if (need_dealloc)
__pthread_dealloc (thread);
/* The THREAD data structure is no longer valid. */
thread = NULL;
/* Deallocate any saved object. */
ss_mutex_lock (&saved_object_lock);
if (! ADDR_IS_VOID (saved_object))
{
storage_free (saved_object, false);
saved_object = ADDR_VOID;
}
ss_mutex_unlock (&saved_object_lock);
/* Free the exception area. */
/* Clean up the exception page. */
exception_page_cleanup
(ADDR_TO_PTR (addr_extend (exception_area[EXCEPTION_PAGE],
0, PAGESIZE_LOG2)));
/* Free the storage. */
int i;
for (i = 0; i < EXCEPTION_AREA_SIZE / PAGESIZE; i ++)
{
assert (! ADDR_IS_VOID (exception_area[i]));
storage_free (exception_area[i], false);
}
/* And the address space. */
as_free (addr_chop (PTR_TO_ADDR (va), EXCEPTION_AREA_SIZE_LOG2), false);
if (tid == l4_myself ())
/* If we try to storage_free (storage.addr), we will freeze in the
middle. That's no good. We set SAVED_OBJECT to our thread
object and the next thread in will free us. */
{
ss_mutex_lock (&saved_object_lock);
saved_object = object;
ss_mutex_unlock (&saved_object_lock);
}
else
storage_free (object, false);
if (tid == l4_myself ())
{
l4_send_timeout (l4_myself (), L4_NEVER);
panic ("Failed to stop thread %x.%x!",
l4_thread_no (l4_myself ()), l4_version (l4_myself ()));
}
else
thread_stop (object);
}
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