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/*
Copyright (C) 1995 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/BSG.
This file is part of the GNU Hurd.
The GNU Hurd 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, or (at
your option) any later version.
The GNU Hurd 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, USA. */
#include <asm/system.h>
struct mutex global_interrupt_lock = MUTEX_INITIALIZER;
struct task_struct *current;
struct mutex user_kernel_lock = MUTEX_INITIALIZER;
/* Call this before doing kernel-level calls; this enforces the
non-preemptibility of the kernel. */
void
start_kernel (struct task_struct *task)
{
mutex_lock (&user_kernel_lock);
mutex_lock (&global_interrupt_lock);
current = task;
mutex_unlock (&global_interrupt_lock);
}
/* Call this when done doing a kernel-level call. */
void
end_kernel (void)
{
mutex_lock (&global_interrupt_lock);
current = 0;
mutex_unlock (&global_interrupt_lock);
mutex_unlock (&user_kernel_lock);
}
void
interruptible_sleep_on (struct wait_queue **p)
{
condition_wait (&(*p)->c, &user_kernel_lock);
}
void
wake_up_interruptible (struct wait_queue **p)
{
condition_broadcast (&(*p)->c);
}
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