linux/include/linux/async.h
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   1/*
   2 * async.h: Asynchronous function calls for boot performance
   3 *
   4 * (C) Copyright 2009 Intel Corporation
   5 * Author: Arjan van de Ven <arjan@linux.intel.com>
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License
   9 * as published by the Free Software Foundation; version 2
  10 * of the License.
  11 */
  12#ifndef __ASYNC_H__
  13#define __ASYNC_H__
  14
  15#include <linux/types.h>
  16#include <linux/list.h>
  17
  18typedef u64 async_cookie_t;
  19typedef void (async_func_ptr) (void *data, async_cookie_t cookie);
  20struct async_domain {
  21        struct list_head node;
  22        struct list_head pending;
  23        unsigned registered:1;
  24};
  25
  26/*
  27 * domain participates in global async_synchronize_full
  28 */
  29#define ASYNC_DOMAIN(_name) \
  30        struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \
  31                                      .pending = LIST_HEAD_INIT(_name.pending), \
  32                                      .registered = 1 }
  33
  34/*
  35 * domain is free to go out of scope as soon as all pending work is
  36 * complete, this domain does not participate in async_synchronize_full
  37 */
  38#define ASYNC_DOMAIN_EXCLUSIVE(_name) \
  39        struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \
  40                                      .pending = LIST_HEAD_INIT(_name.pending), \
  41                                      .registered = 0 }
  42
  43extern async_cookie_t async_schedule(async_func_ptr *ptr, void *data);
  44extern async_cookie_t async_schedule_domain(async_func_ptr *ptr, void *data,
  45                                            struct async_domain *domain);
  46void async_unregister_domain(struct async_domain *domain);
  47extern void async_synchronize_full(void);
  48extern void async_synchronize_full_domain(struct async_domain *domain);
  49extern void async_synchronize_cookie(async_cookie_t cookie);
  50extern void async_synchronize_cookie_domain(async_cookie_t cookie,
  51                                            struct async_domain *domain);
  52extern bool current_is_async(void);
  53#endif
  54
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