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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.  
  57. struct thread;
  58.  
  59. /** Task structure. */
  60. typedef struct task {
  61.     /** Task's linkage for the tasks_tree AVL tree. */
  62.     avltree_node_t tasks_tree_node;
  63.    
  64.     /** Task lock.
  65.      *
  66.      * Must be acquired before threads_lock and thread lock of any of its
  67.      * threads.
  68.      */
  69.     SPINLOCK_DECLARE(lock);
  70.    
  71.     char *name;
  72.     /** List of threads contained in this task. */
  73.     link_t th_head;
  74.     /** Address space. */
  75.     as_t *as;
  76.     /** Unique identity of task. */
  77.     task_id_t taskid;
  78.     /** Task security context. */
  79.     context_id_t context;  
  80.  
  81.     /** Number of references (i.e. threads). */
  82.     atomic_t refcount;
  83.     /** Number of threads that haven't exited yet. */
  84.     atomic_t lifecount;
  85.  
  86.     /** Task capabilities. */
  87.     cap_t capabilities;
  88.  
  89.     /* IPC stuff */
  90.     answerbox_t answerbox;  /**< Communication endpoint */
  91.     phone_t phones[IPC_MAX_PHONES];
  92.     /**
  93.      * Active asynchronous messages. It is used for limiting uspace to
  94.      * certain extent.
  95.      */
  96.     atomic_t active_calls;
  97.  
  98. #ifdef CONFIG_UDEBUG
  99.     /** Debugging stuff */
  100.     udebug_task_t udebug;
  101.  
  102.     /** Kernel answerbox */
  103.     answerbox_t kernel_box;
  104.     /** Thread used to service kernel answerbox */
  105.     struct thread *kb_thread;
  106.     /** Kbox thread creation vs. begin of cleanup mutual exclusion */
  107.     mutex_t kb_cleanup_lock;
  108.     /** True if cleanup of kbox has already started */
  109.     bool kb_finished;
  110. #endif
  111.    
  112.     /** Architecture specific task data. */
  113.     task_arch_t arch;
  114.    
  115.     /**
  116.      * Serializes access to the B+tree of task's futexes. This mutex is
  117.      * independent on the task spinlock.
  118.      */
  119.     mutex_t futexes_lock;
  120.     /** B+tree of futexes referenced by this task. */
  121.     btree_t futexes;   
  122.    
  123.     /** Accumulated accounting. */
  124.     uint64_t cycles;
  125. } task_t;
  126.  
  127. SPINLOCK_EXTERN(tasks_lock);
  128. extern avltree_t tasks_tree;
  129.  
  130. extern void task_init(void);
  131. extern void task_done(void);
  132. extern task_t *task_create(as_t *as, char *name);
  133. extern void task_destroy(task_t *t);
  134. extern task_t *task_find_by_id(task_id_t id);
  135. extern int task_kill(task_id_t id);
  136. extern uint64_t task_get_accounting(task_t *t);
  137.  
  138. extern void cap_set(task_t *t, cap_t caps);
  139. extern cap_t cap_get(task_t *t);
  140.  
  141. #ifndef task_create_arch
  142. extern void task_create_arch(task_t *t);
  143. #endif
  144.  
  145. #ifndef task_destroy_arch
  146. extern void task_destroy_arch(task_t *t);
  147. #endif
  148.  
  149. extern unative_t sys_task_get_id(task_id_t *uspace_task_id);
  150.  
  151. #endif
  152.  
  153. /** @}
  154.  */
  155.