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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. /** @addtogroup genericproc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_SCHEDULER_H_
  36. #define KERN_SCHEDULER_H_
  37.  
  38. #include <synch/spinlock.h>
  39. #include <time/clock.h>     /* HZ */
  40. #include <atomic.h>
  41. #include <adt/list.h>
  42.  
  43. #define RQ_COUNT        16
  44. #define NEEDS_RELINK_MAX    (HZ)
  45.  
  46. /** Scheduler run queue structure. */
  47. typedef struct {
  48.     SPINLOCK_DECLARE(lock);
  49.     link_t rq_head;     /**< List of ready threads. */
  50.     size_t n;       /**< Number of threads in rq_ready. */
  51. } runq_t;
  52.  
  53. extern atomic_t nrdy;
  54. extern void scheduler_init(void);
  55.  
  56. extern void scheduler_fpu_lazy_request(void);
  57. extern void scheduler(void);
  58. extern void kcpulb(void *arg);
  59.  
  60. extern void sched_print_list(void);
  61.  
  62. /*
  63.  * To be defined by architectures:
  64.  */
  65. extern void before_task_runs_arch(void);
  66. extern void before_thread_runs_arch(void);
  67. extern void after_thread_ran_arch(void);
  68.  
  69. #endif
  70.  
  71. /** @}
  72.  */
  73.