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/*
* fiber2_generic.c
*
* $Id$
*
* _fiber_for_thread and spinlocks
* Implementation for simulated threads
*
* This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
* project.
*
* Copyright (C) 1998-2012 OpenLink Software
*
* This project is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; only version 2 of the License, dated June 1991.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*
*/
#include "thread_int.h"
static jmp_buf _stack_jmp;
static jmp_buf _cont_jmp;
static thread_t *_boot;
static int _stack_direction;
static void
stack_helper (char *addr)
{
/* # bytes overhead per call - probably too optimistic */
#define STK_FRAME_LEN 16
auto char here[4096];
auto ptrlong sz;
if (addr == NULL)
stack_helper (here);
if (_stack_direction == -1)
sz = addr - here;
else
sz = here - addr;
assert (sz > 0);
sz += STK_FRAME_LEN + sizeof (here) + sizeof (sz);
if ((unsigned long) sz < _boot->thr_stack_size)
stack_helper (addr);
*_boot->thr_stack_marker = THREAD_STACK_MARKER;
if (setjmp (_cont_jmp) == 0)
longjmp (_stack_jmp, 1);
_fiber_boot (_boot);
stack_helper (here);
}
static int
find_stack_direction (char *addr)
{
auto char here;
if (addr == NULL)
return find_stack_direction (&here);
return (&here > addr) ? 1 : -1;
}
/*
* Associate a fiber with a thread structure
*/
void
_fiber_for_thread (thread_t *self, unsigned long stack_size)
{
self->thr_stack_size = stack_size;
/*
* If this is the first time, it's the main thread converting
* itself into a fiber
*/
if (_boot == NULL)
{
_stack_direction = find_stack_direction (NULL);
_boot = self;
if (setjmp (_stack_jmp) == 0)
stack_helper (NULL);
return;
}
_boot = self;
if (setjmp (_stack_jmp) == 0)
longjmp (_cont_jmp, 1);
}
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