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