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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_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 <adt/btree.h>
  44. #include <mm/slab.h>
  45. #include <arch/cpu.h>
  46. #include <mm/tlb.h>
  47. #include <proc/uarg.h>
  48.  
  49. #define THREAD_STACK_SIZE   STACK_SIZE
  50. #define THREAD_NAME_BUFLEN  20
  51.  
  52. extern char *thread_states[];
  53.  
  54. /* Thread flags */
  55. #define THREAD_FLAG_WIRED   (1 << 0)    /**< Thread cannot be migrated to another CPU. */
  56. #define THREAD_FLAG_STOLEN  (1 << 1)    /**< Thread was migrated to another CPU and has not run yet. */
  57. #define THREAD_FLAG_USPACE  (1 << 2)    /**< Thread executes in userspace. */
  58.  
  59. /** Thread states. */
  60. typedef enum {
  61.     Invalid,    /**< It is an error, if thread is found in this state. */
  62.     Running,    /**< State of a thread that is currently executing on some CPU. */
  63.     Sleeping,   /**< Thread in this state is waiting for an event. */
  64.     Ready,      /**< State of threads in a run queue. */
  65.     Entering,   /**< Threads are in this state before they are first readied. */
  66.     Exiting,    /**< After a thread calls thread_exit(), it is put into Exiting state. */
  67.     Undead      /**< Threads that were not detached but exited are in the Undead state. */
  68. } state_t;
  69.  
  70. /** Join types. */
  71. typedef enum {
  72.     None,
  73.     TaskClnp,   /**< The thread will be joined by ktaskclnp thread. */
  74.     TaskGC      /**< The thread will be joined by ktaskgc thread. */
  75. } thread_join_type_t;
  76.  
  77. /** Thread structure. There is one per thread. */
  78. typedef struct thread {
  79.     link_t rq_link;             /**< Run queue link. */
  80.     link_t wq_link;             /**< Wait queue link. */
  81.     link_t th_link;             /**< Links to threads within containing task. */
  82.    
  83.     /** Lock protecting thread structure.
  84.      *
  85.      * Protects the whole thread structure except list links above.
  86.      */
  87.     SPINLOCK_DECLARE(lock);
  88.  
  89.     char name[THREAD_NAME_BUFLEN];
  90.  
  91.     void (* thread_code)(void *);       /**< Function implementing the thread. */
  92.     void *thread_arg;           /**< Argument passed to thread_code() function. */
  93.  
  94.     /** From here, the stored context is restored when the thread is scheduled. */
  95.     context_t saved_context;
  96.     /** From here, the stored timeout context is restored when sleep times out. */
  97.     context_t sleep_timeout_context;
  98.     /** From here, the stored interruption context is restored when sleep is interrupted. */
  99.     context_t sleep_interruption_context;
  100.  
  101.     bool sleep_interruptible;       /**< If true, the thread can be interrupted from sleep. */
  102.     waitq_t *sleep_queue;           /**< Wait queue in which this thread sleeps. */
  103.     timeout_t sleep_timeout;        /**< Timeout used for timeoutable sleeping.  */
  104.     volatile int timeout_pending;       /**< Flag signalling sleep timeout in progress. */
  105.  
  106.     /** True if this thread is executing copy_from_uspace(). False otherwise. */
  107.     bool in_copy_from_uspace;
  108.     /** True if this thread is executing copy_to_uspace(). False otherwise. */
  109.     bool in_copy_to_uspace;
  110.    
  111.     /**
  112.      * If true, the thread will not go to sleep at all and will
  113.      * call thread_exit() before returning to userspace.
  114.      */
  115.     bool interrupted;          
  116.    
  117.     thread_join_type_t  join_type;  /**< Who joinins the thread. */
  118.     bool detached;              /**< If true, thread_join_timeout() cannot be used on this thread. */
  119.     waitq_t join_wq;            /**< Waitq for thread_join_timeout(). */
  120.  
  121.     fpu_context_t *saved_fpu_context;
  122.     int fpu_context_exists;
  123.  
  124.     /*
  125.      * Defined only if thread doesn't run.
  126.      * It means that fpu context is in CPU that last time executes this thread.
  127.      * This disables migration.
  128.      */
  129.     int fpu_context_engaged;
  130.  
  131.     rwlock_type_t rwlock_holder_type;
  132.  
  133.     void (* call_me)(void *);       /**< Funtion to be called in scheduler before the thread is put asleep. */
  134.     void *call_me_with;         /**< Argument passed to call_me(). */
  135.  
  136.     state_t state;              /**< Thread's state. */
  137.     int flags;              /**< Thread's flags. */
  138.    
  139.     cpu_t *cpu;             /**< Thread's CPU. */
  140.     task_t *task;               /**< Containing task. */
  141.  
  142.     uint64_t ticks;             /**< Ticks before preemption. */
  143.    
  144.     uint64_t cycles;            /**< Thread accounting. */
  145.     uint64_t last_cycle;        /**< Last sampled cycle. */
  146.     bool uncounted;             /**< Thread doesn't affect accumulated accounting. */
  147.  
  148.     int priority;               /**< Thread's priority. Implemented as index to CPU->rq */
  149.     uint32_t tid;               /**< Thread ID. */
  150.    
  151.     thread_arch_t arch;         /**< Architecture-specific data. */
  152.  
  153.     uint8_t *kstack;            /**< Thread's kernel stack. */
  154. } thread_t;
  155.  
  156. /** Thread list lock.
  157.  *
  158.  * This lock protects all link_t structures chained in threads_head.
  159.  * Must be acquired before T.lock for each T of type thread_t.
  160.  *
  161.  */
  162. SPINLOCK_EXTERN(threads_lock);
  163.  
  164. extern btree_t threads_btree;           /**< B+tree containing all threads. */
  165.  
  166. extern void thread_init(void);
  167. extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name, bool uncounted);
  168. extern void thread_ready(thread_t *t);
  169. extern void thread_exit(void) __attribute__((noreturn));
  170.  
  171. #ifndef thread_create_arch
  172. extern void thread_create_arch(thread_t *t);
  173. #endif
  174. #ifndef thr_constructor_arch
  175. extern void thr_constructor_arch(thread_t *t);
  176. #endif
  177. #ifndef thr_destructor_arch
  178. extern void thr_destructor_arch(thread_t *t);
  179. #endif
  180.  
  181. extern void thread_sleep(uint32_t sec);
  182. extern void thread_usleep(uint32_t usec);
  183.  
  184. #define thread_join(t)  thread_join_timeout((t), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
  185. extern int thread_join_timeout(thread_t *t, uint32_t usec, int flags);
  186. extern void thread_detach(thread_t *t);
  187.  
  188. extern void thread_register_call_me(void (* call_me)(void *), void *call_me_with);
  189. extern void thread_print_list(void);
  190. extern void thread_destroy(thread_t *t);
  191. extern void thread_update_accounting(void);
  192. extern bool thread_exists(thread_t *t);
  193. extern void thread_interrupt_sleep(thread_t *t);
  194.  
  195. /* Fpu context slab cache */
  196. extern slab_cache_t *fpu_context_slab;
  197.  
  198. /** Thread syscall prototypes. */
  199. unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name);
  200. unative_t sys_thread_exit(int uspace_status);
  201.  
  202. #endif
  203.  
  204. /** @}
  205.  */
  206.