/* bottom-half.h - Bottom half interface.
   Copyright (C) 2009 Free Software Foundation, Inc.
   Written by Neal H. Walfield <neal@gnu.org>.

   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 3 of the
   License, 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, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _VIENGOOS_BOTTOM_HALF_H
#define _VIENGOOS_BOTTOM_HALF_H 1

#include <hurd/stddef.h>

/* A bottom half.  */
struct bottom_half
{
  struct bottom_half *next;
  void (*callback) (struct bottom_half *bh);
};

/* Queue a bottom half function for callback.  This function is safe
   to call from an interrupt handler.  */
extern void bottom_half_register (struct bottom_half *bh);

/* Run any registered bottom half handlers.  */
static inline void
bottom_half_run (void)
{
  extern struct bottom_half *bottom_halves;
  extern void bottom_half_run_hard (void);

  if (unlikely (bottom_halves))
    bottom_half_run_hard ();
}

#endif