kernel/thread.h

   1 /*
   2  *    Copyright (c) 2008 Joshua Phillips. All rights reserved.
   3  *
   4  *  Redistribution and use in source and binary forms, with or without
   5  *  modification, are permitted provided that the following conditions are
   6  *  met:
   7  *
   8  *    1. Redistributions of source code must retain the above copyright
   9  *       notice, this list of conditions and the following disclaimer.
  10  *    2. Redistributions in binary form must reproduce the above copyright
  11  *       notice, this list of conditions and the following disclaimer in
  12  *       the documentation and/or other materials provided with the
  13  *       distribution.
  14  *
  15  *  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
  16  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  *  DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  19  *  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  21  *  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  22  *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  23  *  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  *  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  25  *  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #ifndef THREAD_H
  29 #define THREAD_H
  30
  31 #include "cpustruct.h"
  32 #include "stdint.h"
  33 #include "timer.h"
  34 #include "interrupt.h"
  35 #include "mm/region.h"
  36
  37 struct thread {
  38     struct thread *prev, *next;
  39     struct pusha_struct regs;
  40     int suspend_count;
  41     uint32_t eip, eflags;
  42     struct addr_space *aspace;
  43 };
  44
  45 // only for use by timer.c
  46 extern int preempt_on;
  47 extern tick_t next_preempt;
  48
  49 void thread_sys_init(void); // initialize the threading system
  50 void thread_sys_start(void); // start the threading system
  51 struct thread *thread_new(void);
  52 void thread_set_aspace(struct thread *t, struct addr_space *aspace);
  53 void thread_set_eip(struct thread *t, uint32_t eip);
  54 void thread_set_esp(struct thread *t, uint32_t esp);
  55 void thread_resume(struct thread *t);
  56 void thread_suspend(struct thread *t);
  57 void thread_delete(struct thread *t);
  58 void yield_internal(void);
  59 void yield(void);
  60 void preempt(struct interrupt_stack *is);
  61
  62 #endif