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