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/* Allocate kernel thread. Hurd/L4 version.
Copyright (C) 2007, 2008 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <hurd/startup.h>
#include <hurd/storage.h>
#include <pt-internal.h>
extern struct hurd_startup_data *__hurd_startup_data;
extern addr_t meta_data_activity;
int
__pthread_thread_alloc (struct __pthread *thread)
{
/* The main thread is already running of course. */
if (__pthread_num_threads == 1)
{
thread->object.addr = __hurd_startup_data->thread;
/* If the main thread exits, then we wait. Thus, we don't need
the shadow cap. */
thread->object.cap = NULL;
thread->threadid = l4_myself ();
return 0;
}
else
{
struct storage storage;
/* We can't don't use mmap as when the exception thread starts
running and it accesses its stack, it will fault, which we
naturally cannot handle. */
storage = storage_alloc (ADDR_VOID, cap_page,
STORAGE_UNKNOWN, OBJECT_POLICY_DEFAULT,
ADDR_VOID);
if (ADDR_IS_VOID (storage.addr))
return EAGAIN;
thread->exception_page = storage;
storage = storage_alloc (meta_data_activity, cap_thread,
/* Threads are rarely shortly lived. */
STORAGE_MEDIUM_LIVED, OBJECT_POLICY_DEFAULT,
ADDR_VOID);
if (ADDR_IS_VOID (storage.addr))
{
storage_free (thread->exception_page.addr, false);
return EAGAIN;
}
thread->object = storage;
}
return 0;
}
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