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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __TIMEOUT_H__
  30. #define __TIMEOUT_H__
  31.  
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34. #include <synch/spinlock.h>
  35. #include <list.h>
  36.  
  37. #define us2ticks(us)    ((__u64)(((__u32) (us)/(1000000/HZ))))
  38.  
  39. typedef void (* timeout_handler_t)(void *arg);
  40.  
  41. struct timeout {
  42.     spinlock_t lock;
  43.  
  44.     link_t link;            /**< Link to the list of active timeouts on THE->cpu */
  45.    
  46.     __u64 ticks;            /**< Timeout will be activated in this amount of clock() ticks. */
  47.  
  48.     timeout_handler_t handler;  /**< Function that will be called on timeout activation. */
  49.     void *arg;          /**< Argument to be passed to handler() function. */
  50.    
  51.     cpu_t *cpu;         /**< On which processor is this timeout registered. */
  52. };
  53.  
  54. extern void timeout_init(void);
  55. extern void timeout_initialize(timeout_t *t);
  56. extern void timeout_reinitialize(timeout_t *t);
  57. extern void timeout_register(timeout_t *t, __u64 usec, timeout_handler_t f, void *arg);
  58. extern bool timeout_unregister(timeout_t *t);
  59.  
  60. #endif
  61.