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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.     ipl_t ipl;
  230.    
  231.     t = (thread_t *) slab_alloc(thread_slab, 0);
  232.    
  233.     /* Not needed, but good for debugging */
  234.     memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
  235.    
  236.     ipl = interrupts_disable();
  237.     spinlock_lock(&tidlock);
  238.     t->tid = ++last_tid;
  239.     spinlock_unlock(&tidlock);
  240.     interrupts_restore(ipl);
  241.    
  242.     context_save(&t->saved_context);
  243.     context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
  244.    
  245.     the_initialize((the_t *) t->kstack);
  246.    
  247.     ipl = interrupts_disable();
  248.     t->saved_context.ipl = interrupts_read();
  249.     interrupts_restore(ipl);
  250.    
  251.     t->thread_code = func;
  252.     t->thread_arg = arg;
  253.     t->ticks = -1;
  254.     t->priority = -1;       /* start in rq[0] */
  255.     t->cpu = NULL;
  256.     t->flags = 0;
  257.     t->state = Entering;
  258.     t->call_me = NULL;
  259.     t->call_me_with = NULL;
  260.    
  261.     timeout_initialize(&t->sleep_timeout);
  262.     t->sleep_queue = NULL;
  263.     t->timeout_pending = 0;
  264.    
  265.     t->rwlock_holder_type = RWLOCK_NONE;
  266.        
  267.     t->task = task;
  268.    
  269.     t->fpu_context_exists=0;
  270.     t->fpu_context_engaged=0;
  271.    
  272.     /*
  273.      * Register this thread in the system-wide list.
  274.      */
  275.     ipl = interrupts_disable();
  276.     spinlock_lock(&threads_lock);
  277.     list_append(&t->threads_link, &threads_head);
  278.     spinlock_unlock(&threads_lock);
  279.    
  280.     /*
  281.      * Attach to the containing task.
  282.      */
  283.     spinlock_lock(&task->lock);
  284.     list_append(&t->th_link, &task->th_head);
  285.     spinlock_unlock(&task->lock);
  286.    
  287.     interrupts_restore(ipl);
  288.  
  289.     return t;
  290. }
  291.  
  292.  
  293. /** Make thread exiting
  294.  *
  295.  * End current thread execution and switch it to the exiting
  296.  * state. All pending timeouts are executed.
  297.  *
  298.  */
  299. void thread_exit(void)
  300. {
  301.     ipl_t ipl;
  302.  
  303. restart:
  304.     ipl = interrupts_disable();
  305.     spinlock_lock(&THREAD->lock);
  306.     if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
  307.         spinlock_unlock(&THREAD->lock);
  308.         interrupts_restore(ipl);
  309.         goto restart;
  310.     }
  311.     THREAD->state = Exiting;
  312.     spinlock_unlock(&THREAD->lock);
  313.     scheduler();
  314. }
  315.  
  316.  
  317. /** Thread sleep
  318.  *
  319.  * Suspend execution of the current thread.
  320.  *
  321.  * @param sec Number of seconds to sleep.
  322.  *
  323.  */
  324. void thread_sleep(__u32 sec)
  325. {
  326.     thread_usleep(sec*1000000);
  327. }
  328.  
  329.  
  330. /** Thread usleep
  331.  *
  332.  * Suspend execution of the current thread.
  333.  *
  334.  * @param usec Number of microseconds to sleep.
  335.  *
  336.  */
  337. void thread_usleep(__u32 usec)
  338. {
  339.     waitq_t wq;
  340.                  
  341.     waitq_initialize(&wq);
  342.  
  343.     (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
  344. }
  345.  
  346.  
  347. /** Register thread out-of-context invocation
  348.  *
  349.  * Register a function and its argument to be executed
  350.  * on next context switch to the current thread.
  351.  *
  352.  * @param call_me      Out-of-context function.
  353.  * @param call_me_with Out-of-context function argument.
  354.  *
  355.  */
  356. void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
  357. {
  358.     ipl_t ipl;
  359.    
  360.     ipl = interrupts_disable();
  361.     spinlock_lock(&THREAD->lock);
  362.     THREAD->call_me = call_me;
  363.     THREAD->call_me_with = call_me_with;
  364.     spinlock_unlock(&THREAD->lock);
  365.     interrupts_restore(ipl);
  366. }
  367.  
  368. /** Print list of threads debug info */
  369. void thread_print_list(void)
  370. {
  371.     link_t *cur;
  372.     thread_t *t;
  373.     ipl_t ipl;
  374.    
  375.     /* Messing with thread structures, avoid deadlock */
  376.     ipl = interrupts_disable();
  377.     spinlock_lock(&threads_lock);
  378.  
  379.     for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
  380.         t = list_get_instance(cur, thread_t, threads_link);
  381.         printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
  382.         if (t->cpu)
  383.             printf("cpu%d ", t->cpu->id);
  384.        
  385.         printf("\n");
  386.     }
  387.  
  388.     spinlock_unlock(&threads_lock);
  389.     interrupts_enable();
  390. }
  391.