include/linux/async.h

   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
  18 typedef u64 async_cookie_t;
  19 typedef void (*async_func_t) (void *data, async_cookie_t cookie);
  20 struct async_domain {
  21         struct list_head pending;
  22         unsigned registered:1;
  23 };
  24
  25 /*
  26  * domain participates in global async_synchronize_full
  27  */
  28 #define ASYNC_DOMAIN(_name) \
  29         struct async_domain _name = { .pending = LIST_HEAD_INIT(_name.pending), \
  30                                       .registered = 1 }
  31
  32 /*
  33  * domain is free to go out of scope as soon as all pending work is
  34  * complete, this domain does not participate in async_synchronize_full
  35  */
  36 #define ASYNC_DOMAIN_EXCLUSIVE(_name) \
  37         struct async_domain _name = { .pending = LIST_HEAD_INIT(_name.pending), \
  38                                       .registered = 0 }
  39
  40 extern async_cookie_t async_schedule(async_func_t func, void *data);
  41 extern async_cookie_t async_schedule_domain(async_func_t func, void *data,
  42                                             struct async_domain *domain);
  43 void async_unregister_domain(struct async_domain *domain);
  44 extern void async_synchronize_full(void);
  45 extern void async_synchronize_full_domain(struct async_domain *domain);
  46 extern void async_synchronize_cookie(async_cookie_t cookie);
  47 extern void async_synchronize_cookie_domain(async_cookie_t cookie,
  48                                             struct async_domain *domain);
  49 extern bool current_is_async(void);
  50 #endif