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/******************************************************************************
* preempt.c
*
* Track atomic regions in the hypervisor which disallow sleeping.
*
* Copyright (c) 2010, Keir Fraser <keir@xen.org>
*
* This program 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <xen/preempt.h>
#include <xen/irq.h>
#include <asm/system.h>
DEFINE_PER_CPU(unsigned int, __preempt_count);
bool_t in_atomic(void)
{
return preempt_count() || in_irq() || !local_irq_is_enabled();
}
#ifndef NDEBUG
void ASSERT_NOT_IN_ATOMIC(void)
{
ASSERT(!preempt_count());
ASSERT(!in_irq());
ASSERT(local_irq_is_enabled());
}
#endif
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