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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_TASK_H_
  36. #define KERN_TASK_H_
  37.  
  38. #include <cpu.h>
  39. #include <ipc/ipc.h>
  40. #include <synch/spinlock.h>
  41. #include <synch/mutex.h>
  42. #include <synch/rwlock.h>
  43. #include <synch/futex.h>
  44. #include <adt/avl.h>
  45. #include <adt/btree.h>
  46. #include <adt/list.h>
  47. #include <security/cap.h>
  48. #include <arch/proc/task.h>
  49. #include <arch/proc/thread.h>
  50. #include <arch/context.h>
  51. #include <arch/fpu_context.h>
  52. #include <arch/cpu.h>
  53. #include <mm/tlb.h>
  54. #include <proc/scheduler.h>
  55. #include <udebug/udebug.h>
  56. #include <ipc/kbox.h>
  57.  
  58. #define TASK_NAME_BUFLEN    20
  59.  
  60. struct thread;
  61.  
  62. /** Task structure. */
  63. typedef struct task {
  64.     /** Task's linkage for the tasks_tree AVL tree. */
  65.     avltree_node_t tasks_tree_node;
  66.    
  67.     /** Task lock.
  68.      *
  69.      * Must be acquired before threads_lock and thread lock of any of its
  70.      * threads.
  71.      */
  72.     SPINLOCK_DECLARE(lock);
  73.  
  74.     char name[TASK_NAME_BUFLEN];
  75.     /** List of threads contained in this task. */
  76.     link_t th_head;
  77.     /** Address space. */
  78.     as_t *as;
  79.     /** Unique identity of task. */
  80.     task_id_t taskid;
  81.     /** Task security context. */
  82.     context_id_t context;  
  83.  
  84.     /** Number of references (i.e. threads). */
  85.     atomic_t refcount;
  86.     /** Number of threads that haven't exited yet. */
  87.     atomic_t lifecount;
  88.  
  89.     /** Task capabilities. */
  90.     cap_t capabilities;
  91.  
  92.     /* IPC stuff */
  93.     answerbox_t answerbox;  /**< Communication endpoint */
  94.     phone_t phones[IPC_MAX_PHONES];
  95.     /**
  96.      * Active asynchronous messages. It is used for limiting uspace to
  97.      * certain extent.
  98.      */
  99.     atomic_t active_calls;
  100.  
  101. #ifdef CONFIG_UDEBUG
  102.     /** Debugging stuff. */
  103.     udebug_task_t udebug;
  104.  
  105.     /** Kernel answerbox. */
  106.     kbox_t kb;
  107. #endif
  108.  
  109.     /** Architecture specific task data. */
  110.     task_arch_t arch;
  111.    
  112.     /**
  113.      * Serializes access to the B+tree of task's futexes. This mutex is
  114.      * independent on the task spinlock.
  115.      */
  116.     mutex_t futexes_lock;
  117.     /** B+tree of futexes referenced by this task. */
  118.     btree_t futexes;   
  119.    
  120.     /** Accumulated accounting. */
  121.     uint64_t cycles;
  122. } task_t;
  123.  
  124. SPINLOCK_EXTERN(tasks_lock);
  125. extern avltree_t tasks_tree;
  126.  
  127. extern void task_init(void);
  128. extern void task_done(void);
  129. extern task_t *task_create(as_t *as, char *name);
  130. extern void task_destroy(task_t *t);
  131. extern task_t *task_find_by_id(task_id_t id);
  132. extern int task_kill(task_id_t id);
  133. extern uint64_t task_get_accounting(task_t *t);
  134.  
  135. extern void cap_set(task_t *t, cap_t caps);
  136. extern cap_t cap_get(task_t *t);
  137.  
  138. #ifndef task_create_arch
  139. extern void task_create_arch(task_t *t);
  140. #endif
  141.  
  142. #ifndef task_destroy_arch
  143. extern void task_destroy_arch(task_t *t);
  144. #endif
  145.  
  146. extern unative_t sys_task_get_id(task_id_t *uspace_task_id);
  147.  
  148. #endif
  149.  
  150. /** @}
  151.  */
  152.