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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 __TASK_H__
  36. #define __TASK_H__
  37.  
  38. #include <typedefs.h>
  39. #include <synch/spinlock.h>
  40. #include <synch/mutex.h>
  41. #include <synch/futex.h>
  42. #include <adt/btree.h>
  43. #include <adt/list.h>
  44. #include <ipc/ipc.h>
  45. #include <security/cap.h>
  46. #include <arch/proc/task.h>
  47.  
  48. /** Task structure. */
  49. struct task {
  50.     /** Task lock.
  51.      *
  52.      * Must be acquired before threads_lock and thread lock of any of its threads.
  53.      */
  54.     SPINLOCK_DECLARE(lock);
  55.    
  56.     char *name;
  57.     thread_t *main_thread;  /**< Pointer to the main thread. */
  58.     link_t th_head;     /**< List of threads contained in this task. */
  59.     as_t *as;       /**< Address space. */
  60.     task_id_t taskid;   /**< Unique identity of task */
  61.  
  62.     /** If this is true, new threads can become part of the task. */
  63.     bool accept_new_threads;
  64.  
  65.     count_t refcount;   /**< Number of references (i.e. threads). */
  66.  
  67.     cap_t capabilities; /**< Task capabilities. */
  68.  
  69.     /* IPC stuff */
  70.     answerbox_t answerbox;  /**< Communication endpoint */
  71.     phone_t phones[IPC_MAX_PHONES];
  72.     atomic_t active_calls;  /**< Active asynchronous messages.
  73.                  *   It is used for limiting uspace to
  74.                  *   certain extent. */
  75.    
  76.     task_arch_t arch;   /**< Architecture specific task data. */
  77.    
  78.     /**
  79.      * Serializes access to the B+tree of task's futexes. This mutex is
  80.      * independent on the task spinlock.
  81.      */
  82.     mutex_t futexes_lock;
  83.     btree_t futexes;    /**< B+tree of futexes referenced by this task. */
  84. };
  85.  
  86. extern spinlock_t tasks_lock;
  87. extern btree_t tasks_btree;
  88.  
  89. extern void task_init(void);
  90. extern task_t *task_create(as_t *as, char *name);
  91. extern void task_destroy(task_t *t);
  92. extern task_t *task_run_program(void *program_addr, char *name);
  93. extern task_t *task_find_by_id(task_id_t id);
  94. extern int task_kill(task_id_t id);
  95.  
  96.  
  97. #ifndef task_create_arch
  98. extern void task_create_arch(task_t *t);
  99. #endif
  100.  
  101. #ifndef task_destroy_arch
  102. extern void task_destroy_arch(task_t *t);
  103. #endif
  104.  
  105. extern unative_t sys_task_get_id(task_id_t *uspace_task_id);
  106.  
  107. #endif
  108.  
  109.  /** @}
  110.  */
  111.  
  112.