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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/heap.h>
  33. #include <mm/frame.h>
  34. #include <mm/page.h>
  35. #include <arch/asm.h>
  36. #include <arch.h>
  37. #include <synch/synch.h>
  38. #include <synch/spinlock.h>
  39. #include <synch/waitq.h>
  40. #include <synch/rwlock.h>
  41. #include <cpu.h>
  42. #include <func.h>
  43. #include <context.h>
  44. #include <list.h>
  45. #include <typedefs.h>
  46. #include <time/clock.h>
  47. #include <list.h>
  48. #include <config.h>
  49. #include <arch/interrupt.h>
  50. #include <smp/ipi.h>
  51. #include <arch/faddr.h>
  52. #include <arch/atomic.h>
  53. #include <memstr.h>
  54.  
  55. char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
  56.  
  57. SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
  58. LIST_INITIALIZE(threads_head);      /**< List of all threads. */
  59.  
  60. SPINLOCK_INITIALIZE(tidlock);
  61. __u32 last_tid = 0;
  62.  
  63.  
  64. /** Thread wrapper
  65.  *
  66.  * This wrapper is provided to ensure that every thread
  67.  * makes a call to thread_exit() when its implementing
  68.  * function returns.
  69.  *
  70.  * interrupts_disable() is assumed.
  71.  *
  72.  */
  73. static void cushion(void)
  74. {
  75.     void (*f)(void *) = THREAD->thread_code;
  76.     void *arg = THREAD->thread_arg;
  77.  
  78.     /* this is where each thread wakes up after its creation */
  79.     before_thread_runs();
  80.  
  81.     spinlock_unlock(&THREAD->lock);
  82.     interrupts_enable();
  83.  
  84.     f(arg);
  85.     thread_exit();
  86.     /* not reached */
  87. }
  88.  
  89.  
  90. /** Initialize threads
  91.  *
  92.  * Initialize kernel threads support.
  93.  *
  94.  */
  95. void thread_init(void)
  96. {
  97.     THREAD = NULL;
  98.     atomic_set(&nrdy,0);
  99. }
  100.  
  101.  
  102. /** Make thread ready
  103.  *
  104.  * Switch thread t to the ready state.
  105.  *
  106.  * @param t Thread to make ready.
  107.  *
  108.  */
  109. void thread_ready(thread_t *t)
  110. {
  111.     cpu_t *cpu;
  112.     runq_t *r;
  113.     ipl_t ipl;
  114.     int i, avg;
  115.  
  116.     ipl = interrupts_disable();
  117.  
  118.     spinlock_lock(&t->lock);
  119.  
  120.     i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
  121.    
  122.     cpu = CPU;
  123.     if (t->flags & X_WIRED) {
  124.         cpu = t->cpu;
  125.     }
  126.     spinlock_unlock(&t->lock);
  127.    
  128.     /*
  129.      * Append t to respective ready queue on respective processor.
  130.      */
  131.     r = &cpu->rq[i];
  132.     spinlock_lock(&r->lock);
  133.     list_append(&t->rq_link, &r->rq_head);
  134.     r->n++;
  135.     spinlock_unlock(&r->lock);
  136.  
  137.     atomic_inc(&nrdy);
  138.     avg = atomic_get(&nrdy) / config.cpu_active;
  139.  
  140.     spinlock_lock(&cpu->lock);
  141.     if ((++cpu->nrdy) > avg) {
  142.         /*
  143.          * If there are idle halted CPU's, this will wake them up.
  144.          */
  145.         ipi_broadcast(VECTOR_WAKEUP_IPI);
  146.     }  
  147.     spinlock_unlock(&cpu->lock);
  148.  
  149.     interrupts_restore(ipl);
  150. }
  151.  
  152.  
  153. /** Create new thread
  154.  *
  155.  * Create a new thread.
  156.  *
  157.  * @param func  Thread's implementing function.
  158.  * @param arg   Thread's implementing function argument.
  159.  * @param task  Task to which the thread belongs.
  160.  * @param flags Thread flags.
  161.  *
  162.  * @return New thread's structure on success, NULL on failure.
  163.  *
  164.  */
  165. thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
  166. {
  167.     thread_t *t;
  168.     __address frame_ks, frame_us = NULL;
  169.  
  170.     t = (thread_t *) malloc(sizeof(thread_t));
  171.     if (t) {
  172.         ipl_t ipl;
  173.    
  174.         spinlock_initialize(&t->lock, "thread_t_lock");
  175.    
  176.         frame_ks = frame_alloc(FRAME_KA, ONE_FRAME);
  177.         if (THREAD_USER_STACK & flags) {
  178.             frame_us = frame_alloc(FRAME_KA, ONE_FRAME);
  179.         }
  180.  
  181.         ipl = interrupts_disable();
  182.         spinlock_lock(&tidlock);
  183.         t->tid = ++last_tid;
  184.         spinlock_unlock(&tidlock);
  185.         interrupts_restore(ipl);
  186.        
  187.         memsetb(frame_ks, THREAD_STACK_SIZE, 0);
  188.         link_initialize(&t->rq_link);
  189.         link_initialize(&t->wq_link);
  190.         link_initialize(&t->th_link);
  191.         link_initialize(&t->threads_link);
  192.         t->kstack = (__u8 *) frame_ks;
  193.         t->ustack = (__u8 *) frame_us;
  194.        
  195.         context_save(&t->saved_context);
  196.         context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
  197.        
  198.         the_initialize((the_t *) t->kstack);
  199.  
  200.         ipl = interrupts_disable();
  201.         t->saved_context.ipl = interrupts_read();
  202.         interrupts_restore(ipl);
  203.        
  204.         t->thread_code = func;
  205.         t->thread_arg = arg;
  206.         t->ticks = -1;
  207.         t->priority = -1;       /* start in rq[0] */
  208.         t->cpu = NULL;
  209.         t->flags = 0;
  210.         t->state = Entering;
  211.         t->call_me = NULL;
  212.         t->call_me_with = NULL;
  213.        
  214.         timeout_initialize(&t->sleep_timeout);
  215.         t->sleep_queue = NULL;
  216.         t->timeout_pending = 0;
  217.        
  218.         t->rwlock_holder_type = RWLOCK_NONE;
  219.        
  220.         t->task = task;
  221.        
  222.         t->fpu_context_exists=0;
  223.         t->fpu_context_engaged=0;
  224.        
  225.         /*
  226.          * Register this thread in the system-wide list.
  227.          */
  228.         ipl = interrupts_disable();    
  229.         spinlock_lock(&threads_lock);
  230.         list_append(&t->threads_link, &threads_head);
  231.         spinlock_unlock(&threads_lock);
  232.  
  233.         /*
  234.          * Attach to the containing task.
  235.          */
  236.         spinlock_lock(&task->lock);
  237.         list_append(&t->th_link, &task->th_head);
  238.         spinlock_unlock(&task->lock);
  239.  
  240.         interrupts_restore(ipl);
  241.     }
  242.  
  243.     return t;
  244. }
  245.  
  246.  
  247. /** Make thread exiting
  248.  *
  249.  * End current thread execution and switch it to the exiting
  250.  * state. All pending timeouts are executed.
  251.  *
  252.  */
  253. void thread_exit(void)
  254. {
  255.     ipl_t ipl;
  256.  
  257. restart:
  258.     ipl = interrupts_disable();
  259.     spinlock_lock(&THREAD->lock);
  260.     if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
  261.         spinlock_unlock(&THREAD->lock);
  262.         interrupts_restore(ipl);
  263.         goto restart;
  264.     }
  265.     THREAD->state = Exiting;
  266.     spinlock_unlock(&THREAD->lock);
  267.     scheduler();
  268. }
  269.  
  270.  
  271. /** Thread sleep
  272.  *
  273.  * Suspend execution of the current thread.
  274.  *
  275.  * @param sec Number of seconds to sleep.
  276.  *
  277.  */
  278. void thread_sleep(__u32 sec)
  279. {
  280.     thread_usleep(sec*1000000);
  281. }
  282.  
  283.  
  284. /** Thread usleep
  285.  *
  286.  * Suspend execution of the current thread.
  287.  *
  288.  * @param usec Number of microseconds to sleep.
  289.  *
  290.  */
  291. void thread_usleep(__u32 usec)
  292. {
  293.     waitq_t wq;
  294.                  
  295.     waitq_initialize(&wq);
  296.  
  297.     (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
  298. }
  299.  
  300.  
  301. /** Register thread out-of-context invocation
  302.  *
  303.  * Register a function and its argument to be executed
  304.  * on next context switch to the current thread.
  305.  *
  306.  * @param call_me      Out-of-context function.
  307.  * @param call_me_with Out-of-context function argument.
  308.  *
  309.  */
  310. void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
  311. {
  312.     ipl_t ipl;
  313.    
  314.     ipl = interrupts_disable();
  315.     spinlock_lock(&THREAD->lock);
  316.     THREAD->call_me = call_me;
  317.     THREAD->call_me_with = call_me_with;
  318.     spinlock_unlock(&THREAD->lock);
  319.     interrupts_restore(ipl);
  320. }
  321.