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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. #include <proc/scheduler.h>
  30. #include <proc/thread.h>
  31. #include <proc/task.h>
  32. #include <mm/frame.h>
  33. #include <mm/page.h>
  34. #include <arch/asm.h>
  35. #include <arch.h>
  36. #include <synch/synch.h>
  37. #include <synch/spinlock.h>
  38. #include <synch/waitq.h>
  39. #include <synch/rwlock.h>
  40. #include <cpu.h>
  41. #include <func.h>
  42. #include <context.h>
  43. #include <adt/list.h>
  44. #include <typedefs.h>
  45. #include <time/clock.h>
  46. #include <adt/list.h>
  47. #include <config.h>
  48. #include <arch/interrupt.h>
  49. #include <smp/ipi.h>
  50. #include <arch/faddr.h>
  51. #include <arch/atomic.h>
  52. #include <memstr.h>
  53. #include <print.h>
  54. #include <mm/slab.h>
  55. #include <debug.h>
  56.  
  57. char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
  58.  
  59. SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
  60. LIST_INITIALIZE(threads_head);      /**< List of all threads. */
  61.  
  62. SPINLOCK_INITIALIZE(tidlock);
  63. __u32 last_tid = 0;
  64.  
  65. static slab_cache_t *thread_slab;
  66.  
  67.  
  68. /** Thread wrapper
  69.  *
  70.  * This wrapper is provided to ensure that every thread
  71.  * makes a call to thread_exit() when its implementing
  72.  * function returns.
  73.  *
  74.  * interrupts_disable() is assumed.
  75.  *
  76.  */
  77. static void cushion(void)
  78. {
  79.     void (*f)(void *) = THREAD->thread_code;
  80.     void *arg = THREAD->thread_arg;
  81.  
  82.     /* this is where each thread wakes up after its creation */
  83.     before_thread_runs();
  84.  
  85.     spinlock_unlock(&THREAD->lock);
  86.     interrupts_enable();
  87.  
  88.     f(arg);
  89.     thread_exit();
  90.     /* not reached */
  91. }
  92.  
  93. /** Initialization and allocation for thread_t structure */
  94. static int thr_constructor(void *obj, int kmflags)
  95. {
  96.     thread_t *t = (thread_t *)obj;
  97.     pfn_t pfn;
  98.  
  99.     spinlock_initialize(&t->lock, "thread_t_lock");
  100.     link_initialize(&t->rq_link);
  101.     link_initialize(&t->wq_link);
  102.     link_initialize(&t->th_link);
  103.     link_initialize(&t->threads_link);
  104.    
  105.     pfn = frame_alloc(ONE_FRAME, FRAME_KA | kmflags);
  106.     t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
  107.     if (!t->kstack)
  108.         return -1;
  109.  
  110.     return 0;
  111. }
  112.  
  113. /** Destruction of thread_t object */
  114. static int thr_destructor(void *obj)
  115. {
  116.     thread_t *t = (thread_t *)obj;
  117.  
  118.     frame_free(ADDR2PFN(KA2PA(t->kstack)));
  119.     return 1; /* One page freed */
  120. }
  121.  
  122. /** Initialize threads
  123.  *
  124.  * Initialize kernel threads support.
  125.  *
  126.  */
  127. void thread_init(void)
  128. {
  129.     THREAD = NULL;
  130.     atomic_set(&nrdy,0);
  131.     thread_slab = slab_cache_create("thread_slab",
  132.                     sizeof(thread_t),0,
  133.                     thr_constructor, thr_destructor, 0);
  134. }
  135.  
  136.  
  137. /** Make thread ready
  138.  *
  139.  * Switch thread t to the ready state.
  140.  *
  141.  * @param t Thread to make ready.
  142.  *
  143.  */
  144. void thread_ready(thread_t *t)
  145. {
  146.     cpu_t *cpu;
  147.     runq_t *r;
  148.     ipl_t ipl;
  149.     int i, avg;
  150.  
  151.     ipl = interrupts_disable();
  152.  
  153.     spinlock_lock(&t->lock);
  154.  
  155.     i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
  156.    
  157.     cpu = CPU;
  158.     if (t->flags & X_WIRED) {
  159.         cpu = t->cpu;
  160.     }
  161.     spinlock_unlock(&t->lock);
  162.    
  163.     /*
  164.      * Append t to respective ready queue on respective processor.
  165.      */
  166.     r = &cpu->rq[i];
  167.     spinlock_lock(&r->lock);
  168.     list_append(&t->rq_link, &r->rq_head);
  169.     r->n++;
  170.     spinlock_unlock(&r->lock);
  171.  
  172.     atomic_inc(&nrdy);
  173.     avg = atomic_get(&nrdy) / config.cpu_active;
  174.     atomic_inc(&cpu->nrdy);
  175.  
  176.     interrupts_restore(ipl);
  177. }
  178.  
  179.  
  180. /** Destroy thread memory structure
  181.  *
  182.  * Detach thread from all queues, cpus etc. and destroy it.
  183.  *
  184.  * Assume thread->lock is held!!
  185.  */
  186. void thread_destroy(thread_t *t)
  187. {
  188.     ASSERT(t->state == Exiting);
  189.     ASSERT(t->task);
  190.     ASSERT(t->cpu);
  191.  
  192.     spinlock_lock(&t->cpu->lock);
  193.     if(t->cpu->fpu_owner==t)
  194.         t->cpu->fpu_owner=NULL;
  195.     spinlock_unlock(&t->cpu->lock);
  196.  
  197.     /*
  198.      * Detach from the containing task.
  199.      */
  200.     spinlock_lock(&t->task->lock);
  201.     list_remove(&t->th_link);
  202.     spinlock_unlock(&t->task->lock);
  203.    
  204.     spinlock_unlock(&t->lock);
  205.    
  206.     spinlock_lock(&threads_lock);
  207.     list_remove(&t->threads_link);
  208.     spinlock_unlock(&threads_lock);
  209.    
  210.     slab_free(thread_slab, t);
  211. }
  212.  
  213.  
  214. /** Create new thread
  215.  *
  216.  * Create a new thread.
  217.  *
  218.  * @param func  Thread's implementing function.
  219.  * @param arg   Thread's implementing function argument.
  220.  * @param task  Task to which the thread belongs.
  221.  * @param flags Thread flags.
  222.  *
  223.  * @return New thread's structure on success, NULL on failure.
  224.  *
  225.  */
  226. thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
  227. {
  228.     thread_t *t;
  229.  
  230.     t = (thread_t *) slab_alloc(thread_slab, 0);
  231.     if (t) {
  232.         ipl_t ipl;
  233.    
  234.         /* Not needed, but good for debugging */
  235.         memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
  236.  
  237.         ipl = interrupts_disable();
  238.         spinlock_lock(&tidlock);
  239.         t->tid = ++last_tid;
  240.         spinlock_unlock(&tidlock);
  241.         interrupts_restore(ipl);
  242.        
  243.         context_save(&t->saved_context);
  244.         context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
  245.        
  246.         the_initialize((the_t *) t->kstack);
  247.  
  248.         ipl = interrupts_disable();
  249.         t->saved_context.ipl = interrupts_read();
  250.         interrupts_restore(ipl);
  251.        
  252.         t->thread_code = func;
  253.         t->thread_arg = arg;
  254.         t->ticks = -1;
  255.         t->priority = -1;       /* start in rq[0] */
  256.         t->cpu = NULL;
  257.         t->flags = 0;
  258.         t->state = Entering;
  259.         t->call_me = NULL;
  260.         t->call_me_with = NULL;
  261.        
  262.         timeout_initialize(&t->sleep_timeout);
  263.         t->sleep_queue = NULL;
  264.         t->timeout_pending = 0;
  265.        
  266.         t->rwlock_holder_type = RWLOCK_NONE;
  267.        
  268.         t->task = task;
  269.        
  270.         t->fpu_context_exists=0;
  271.         t->fpu_context_engaged=0;
  272.        
  273.         /*
  274.          * Register this thread in the system-wide list.
  275.          */
  276.         ipl = interrupts_disable();
  277.         spinlock_lock(&threads_lock);
  278.         list_append(&t->threads_link, &threads_head);
  279.         spinlock_unlock(&threads_lock);
  280.  
  281.         /*
  282.          * Attach to the containing task.
  283.          */
  284.         spinlock_lock(&task->lock);
  285.         list_append(&t->th_link, &task->th_head);
  286.         spinlock_unlock(&task->lock);
  287.  
  288.         interrupts_restore(ipl);
  289.     }
  290.  
  291.     return t;
  292. }
  293.  
  294.  
  295. /** Make thread exiting
  296.  *
  297.  * End current thread execution and switch it to the exiting
  298.  * state. All pending timeouts are executed.
  299.  *
  300.  */
  301. void thread_exit(void)
  302. {
  303.     ipl_t ipl;
  304.  
  305. restart:
  306.     ipl = interrupts_disable();
  307.     spinlock_lock(&THREAD->lock);
  308.     if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
  309.         spinlock_unlock(&THREAD->lock);
  310.         interrupts_restore(ipl);
  311.         goto restart;
  312.     }
  313.     THREAD->state = Exiting;
  314.     spinlock_unlock(&THREAD->lock);
  315.     scheduler();
  316. }
  317.  
  318.  
  319. /** Thread sleep
  320.  *
  321.  * Suspend execution of the current thread.
  322.  *
  323.  * @param sec Number of seconds to sleep.
  324.  *
  325.  */
  326. void thread_sleep(__u32 sec)
  327. {
  328.     thread_usleep(sec*1000000);
  329. }
  330.  
  331.  
  332. /** Thread usleep
  333.  *
  334.  * Suspend execution of the current thread.
  335.  *
  336.  * @param usec Number of microseconds to sleep.
  337.  *
  338.  */
  339. void thread_usleep(__u32 usec)
  340. {
  341.     waitq_t wq;
  342.                  
  343.     waitq_initialize(&wq);
  344.  
  345.     (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
  346. }
  347.  
  348.  
  349. /** Register thread out-of-context invocation
  350.  *
  351.  * Register a function and its argument to be executed
  352.  * on next context switch to the current thread.
  353.  *
  354.  * @param call_me      Out-of-context function.
  355.  * @param call_me_with Out-of-context function argument.
  356.  *
  357.  */
  358. void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
  359. {
  360.     ipl_t ipl;
  361.    
  362.     ipl = interrupts_disable();
  363.     spinlock_lock(&THREAD->lock);
  364.     THREAD->call_me = call_me;
  365.     THREAD->call_me_with = call_me_with;
  366.     spinlock_unlock(&THREAD->lock);
  367.     interrupts_restore(ipl);
  368. }
  369.  
  370. /** Print list of threads debug info */
  371. void thread_print_list(void)
  372. {
  373.     link_t *cur;
  374.     thread_t *t;
  375.     ipl_t ipl;
  376.    
  377.     /* Messing with thread structures, avoid deadlock */
  378.     ipl = interrupts_disable();
  379.     spinlock_lock(&threads_lock);
  380.  
  381.     for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
  382.         t = list_get_instance(cur, thread_t, threads_link);
  383.         printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
  384.         if (t->cpu)
  385.             printf("cpu%d ", t->cpu->id);
  386.        
  387.         printf("\n");
  388.     }
  389.  
  390.     spinlock_unlock(&threads_lock);
  391.     interrupts_enable();
  392. }
  393.