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  1. /*
  2.  * Copyright (c) 2001-2007 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_THREAD_H_
  36. #define KERN_THREAD_H_
  37.  
  38. #include <synch/waitq.h>
  39. #include <proc/task.h>
  40. #include <time/timeout.h>
  41. #include <cpu.h>
  42. #include <synch/rwlock.h>
  43. #include <synch/spinlock.h>
  44. #include <adt/avl.h>
  45. #include <mm/slab.h>
  46. #include <arch/cpu.h>
  47. #include <mm/tlb.h>
  48. #include <proc/uarg.h>
  49. #include <udebug/udebug.h>
  50.  
  51. #define THREAD_STACK_SIZE   STACK_SIZE
  52. #define THREAD_NAME_BUFLEN  20
  53.  
  54. extern char *thread_states[];
  55.  
  56. /* Thread flags */
  57.  
  58. /** Thread cannot be migrated to another CPU.
  59.  *
  60.  * When using this flag, the caller must set cpu in the thread_t
  61.  * structure manually before calling thread_ready (even on uniprocessor).
  62.  */
  63. #define THREAD_FLAG_WIRED   (1 << 0)
  64. /** Thread was migrated to another CPU and has not run yet. */
  65. #define THREAD_FLAG_STOLEN  (1 << 1)
  66. /** Thread executes in userspace. */
  67. #define THREAD_FLAG_USPACE  (1 << 2)
  68. /** Thread will be attached by the caller. */
  69. #define THREAD_FLAG_NOATTACH    (1 << 3)
  70.  
  71. /** Thread states. */
  72. typedef enum {
  73.     /** It is an error, if thread is found in this state. */
  74.     Invalid,
  75.     /** State of a thread that is currently executing on some CPU. */
  76.     Running,
  77.     /** Thread in this state is waiting for an event. */
  78.     Sleeping,
  79.     /** State of threads in a run queue. */
  80.     Ready,
  81.     /** Threads are in this state before they are first readied. */
  82.     Entering,
  83.     /** After a thread calls thread_exit(), it is put into Exiting state. */
  84.     Exiting,
  85.     /** Threads that were not detached but exited are Lingering. */
  86.     Lingering
  87. } state_t;
  88.  
  89. /** Thread structure. There is one per thread. */
  90. typedef struct thread {
  91.     link_t rq_link;     /**< Run queue link. */
  92.     link_t wq_link;     /**< Wait queue link. */
  93.     link_t th_link;     /**< Links to threads within containing task. */
  94.  
  95.     /** Threads linkage to the threads_tree. */
  96.     avltree_node_t threads_tree_node;
  97.    
  98.     /** Lock protecting thread structure.
  99.      *
  100.      * Protects the whole thread structure except list links above.
  101.      */
  102.     SPINLOCK_DECLARE(lock);
  103.  
  104.     char name[THREAD_NAME_BUFLEN];
  105.  
  106.     /** Function implementing the thread. */
  107.     void (* thread_code)(void *);
  108.     /** Argument passed to thread_code() function. */
  109.     void *thread_arg;
  110.  
  111.     /**
  112.      * From here, the stored context is restored when the thread is
  113.      * scheduled.
  114.      */
  115.     context_t saved_context;
  116.     /**
  117.      * From here, the stored timeout context is restored when sleep times
  118.      * out.
  119.      */
  120.     context_t sleep_timeout_context;
  121.     /**
  122.      * From here, the stored interruption context is restored when sleep is
  123.      * interrupted.
  124.      */
  125.     context_t sleep_interruption_context;
  126.  
  127.     /** If true, the thread can be interrupted from sleep. */
  128.     bool sleep_interruptible;
  129.     /** Wait queue in which this thread sleeps. */
  130.     waitq_t *sleep_queue;
  131.     /** Timeout used for timeoutable sleeping.  */
  132.     timeout_t sleep_timeout;
  133.     /** Flag signalling sleep timeout in progress. */
  134.     volatile int timeout_pending;
  135.  
  136.     /**
  137.      * True if this thread is executing copy_from_uspace().
  138.      * False otherwise.
  139.      */
  140.     bool in_copy_from_uspace;
  141.     /**
  142.      * True if this thread is executing copy_to_uspace().
  143.      * False otherwise.
  144.      */
  145.     bool in_copy_to_uspace;
  146.    
  147.     /**
  148.      * If true, the thread will not go to sleep at all and will call
  149.      * thread_exit() before returning to userspace.
  150.      */
  151.     bool interrupted;          
  152.    
  153.     /** If true, thread_join_timeout() cannot be used on this thread. */
  154.     bool detached;
  155.     /** Waitq for thread_join_timeout(). */
  156.     waitq_t join_wq;
  157.     /** Link used in the joiner_head list. */
  158.     link_t joiner_link;
  159.  
  160.     fpu_context_t *saved_fpu_context;
  161.     int fpu_context_exists;
  162.  
  163.     /*
  164.      * Defined only if thread doesn't run.
  165.      * It means that fpu context is in CPU that last time executes this
  166.      * thread. This disables migration.
  167.      */
  168.     int fpu_context_engaged;
  169.  
  170.     rwlock_type_t rwlock_holder_type;
  171.  
  172.     /** Callback fired in scheduler before the thread is put asleep. */
  173.     void (* call_me)(void *);
  174.     /** Argument passed to call_me(). */
  175.     void *call_me_with;
  176.  
  177.     /** Thread's state. */
  178.     state_t state;
  179.     /** Thread's flags. */
  180.     int flags;
  181.    
  182.     /** Thread's CPU. */
  183.     cpu_t *cpu;
  184.     /** Containing task. */
  185.     task_t *task;
  186.  
  187.     /** Ticks before preemption. */
  188.     uint64_t ticks;
  189.    
  190.     /** Thread accounting. */
  191.     uint64_t cycles;
  192.     /** Last sampled cycle. */
  193.     uint64_t last_cycle;
  194.     /** Thread doesn't affect accumulated accounting. */   
  195.     bool uncounted;
  196.  
  197.     /** Thread's priority. Implemented as index to CPU->rq */
  198.     int priority;
  199.     /** Thread ID. */
  200.     thread_id_t tid;
  201.    
  202.     /** Architecture-specific data. */
  203.     thread_arch_t arch;
  204.  
  205.     /** Thread's kernel stack. */
  206.     uint8_t *kstack;
  207.  
  208. #ifdef CONFIG_UDEBUG
  209.     /** Debugging stuff */
  210.     udebug_thread_t udebug;
  211. #endif
  212.  
  213. } thread_t;
  214.  
  215. /** Thread list lock.
  216.  *
  217.  * This lock protects the threads_tree.
  218.  * Must be acquired before T.lock for each T of type thread_t.
  219.  *
  220.  */
  221. SPINLOCK_EXTERN(threads_lock);
  222.  
  223. /** AVL tree containing all threads. */
  224. extern avltree_t threads_tree;
  225.  
  226. extern void thread_init(void);
  227. extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
  228.     int flags, char *name, bool uncounted);
  229. extern void thread_attach(thread_t *t, task_t *task);
  230. extern void thread_ready(thread_t *t);
  231. extern void thread_exit(void) __attribute__((noreturn));
  232.  
  233. #ifndef thread_create_arch
  234. extern void thread_create_arch(thread_t *t);
  235. #endif
  236. #ifndef thr_constructor_arch
  237. extern void thr_constructor_arch(thread_t *t);
  238. #endif
  239. #ifndef thr_destructor_arch
  240. extern void thr_destructor_arch(thread_t *t);
  241. #endif
  242.  
  243. extern void thread_sleep(uint32_t sec);
  244. extern void thread_usleep(uint32_t usec);
  245.  
  246. #define thread_join(t) \
  247.     thread_join_timeout((t), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
  248. extern int thread_join_timeout(thread_t *t, uint32_t usec, int flags);
  249. extern void thread_detach(thread_t *t);
  250.  
  251. extern void thread_register_call_me(void (* call_me)(void *),
  252.     void *call_me_with);
  253. extern void thread_print_list(void);
  254. extern void thread_destroy(thread_t *t);
  255. extern void thread_update_accounting(void);
  256. extern bool thread_exists(thread_t *t);
  257.  
  258. /** Fpu context slab cache. */
  259. extern slab_cache_t *fpu_context_slab;
  260.  
  261. /* Thread syscall prototypes. */
  262. extern unative_t sys_thread_create(uspace_arg_t *uspace_uarg,
  263.     char *uspace_name, size_t name_len, thread_id_t *uspace_thread_id);
  264. extern unative_t sys_thread_exit(int uspace_status);
  265. extern unative_t sys_thread_get_id(thread_id_t *uspace_thread_id);
  266.  
  267. #endif
  268.  
  269. /** @}
  270.  */
  271.