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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 __THREAD_H__
  30. #define __THREAD_H__
  31.  
  32. #include <arch/thread.h>
  33. #include <proc/task.h>
  34. #include <synch/spinlock.h>
  35. #include <arch/context.h>
  36. #include <fpu_context.h>
  37. #include <arch/types.h>
  38. #include <typedefs.h>
  39. #include <time/timeout.h>
  40. #include <synch/rwlock.h>
  41. #include <mm/page.h>
  42. #include <config.h>
  43. #include <list.h>
  44.  
  45. #define THREAD_STACK_SIZE   STACK_SIZE
  46.  
  47. #define THREAD_USER_STACK   1
  48.  
  49. enum state {
  50.     Invalid,
  51.     Running,
  52.     Sleeping,
  53.     Ready,
  54.     Entering,
  55.     Exiting
  56. };
  57.  
  58. extern char *thread_states[];
  59.  
  60. #define X_WIRED     (1<<0)
  61. #define X_STOLEN    (1<<1)
  62.  
  63. struct thread {
  64.     link_t rq_link;             /* run queue link */
  65.     link_t wq_link;             /* wait queue link */
  66.     link_t th_link;             /* links to threads within the parent task*/
  67.     link_t threads_link;
  68.    
  69.     /* items below are protected by lock */
  70.     spinlock_t lock;
  71.  
  72.     void (* thread_code)(void *);
  73.     void *thread_arg;
  74.  
  75.     context_t saved_context;
  76.     context_t sleep_timeout_context;
  77.     fpu_context_t saved_fpu_context;
  78.     int fpu_context_exists;
  79.  
  80.     /*
  81.      * Defined only if thread doesn't run.
  82.      * It means that fpu context is in CPU that last time executes this thread.
  83.      * This disables migration
  84.      */
  85.     int fpu_context_engaged;
  86.  
  87.     waitq_t *sleep_queue;
  88.     timeout_t sleep_timeout;
  89.     volatile int timeout_pending;
  90.  
  91.     rwlock_type_t rwlock_holder_type;
  92.     void (* call_me)(void *);
  93.     void *call_me_with;
  94.  
  95.     int state;
  96.     int flags;
  97.    
  98.     cpu_t *cpu;
  99.     task_t *task;
  100.  
  101.     __u64 ticks;
  102.  
  103.     __u32 tid;
  104.    
  105.     int pri;
  106.    
  107.     ARCH_THREAD_DATA;
  108.  
  109.     __u8 *kstack;
  110.     __u8 *ustack;
  111. };
  112.  
  113. extern spinlock_t threads_lock;
  114. extern link_t threads_head;
  115.  
  116. static void cushion(void);
  117.  
  118. extern void thread_init(void);
  119. extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags);
  120. extern void thread_ready(thread_t *t);
  121. extern void thread_exit(void);
  122.  
  123. extern void thread_sleep(__u32 sec);
  124. extern void thread_usleep(__u32 usec);
  125.  
  126. extern void thread_register_call_me(void (* call_me)(void *), void *call_me_with);
  127.  
  128. #endif
  129.