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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_t threads_lock;    /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
  58. link_t threads_head;        /**< List of all threads. */
  59.  
  60. static spinlock_t 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.     nrdy = 0;
  99.     spinlock_initialize(&threads_lock, "threads_lock");
  100.     list_initialize(&threads_head);
  101. }
  102.  
  103.  
  104. /** Make thread ready
  105.  *
  106.  * Switch thread t to the ready state.
  107.  *
  108.  * @param t Thread to make ready.
  109.  *
  110.  */
  111. void thread_ready(thread_t *t)
  112. {
  113.     cpu_t *cpu;
  114.     runq_t *r;
  115.     ipl_t ipl;
  116.     int i, avg, send_ipi = 0;
  117.  
  118.     ipl = interrupts_disable();
  119.  
  120.     spinlock_lock(&t->lock);
  121.  
  122.     i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
  123.    
  124.     cpu = CPU;
  125.     if (t->flags & X_WIRED) {
  126.         cpu = t->cpu;
  127.     }
  128.     spinlock_unlock(&t->lock);
  129.    
  130.     /*
  131.      * Append t to respective ready queue on respective processor.
  132.      */
  133.     r = &cpu->rq[i];
  134.     spinlock_lock(&r->lock);
  135.     list_append(&t->rq_link, &r->rq_head);
  136.     r->n++;
  137.     spinlock_unlock(&r->lock);
  138.  
  139.     atomic_inc(&nrdy);
  140.     avg = nrdy / config.cpu_active;
  141.  
  142.     spinlock_lock(&cpu->lock);
  143.     if ((++cpu->nrdy) > avg) {
  144.         /*
  145.          * If there are idle halted CPU's, this will wake them up.
  146.          */
  147.         ipi_broadcast(VECTOR_WAKEUP_IPI);
  148.     }  
  149.     spinlock_unlock(&cpu->lock);
  150.  
  151.     interrupts_restore(ipl);
  152. }
  153.  
  154.  
  155. /** Create new thread
  156.  *
  157.  * Create a new thread.
  158.  *
  159.  * @param func  Thread's implementing function.
  160.  * @param arg   Thread's implementing function argument.
  161.  * @param task  Task to which the thread belongs.
  162.  * @param flags Thread flags.
  163.  *
  164.  * @return New thread's structure on success, NULL on failure.
  165.  *
  166.  */
  167. thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
  168. {
  169.     thread_t *t;
  170.     __address frame_ks, frame_us = NULL;
  171.  
  172.     t = (thread_t *) malloc(sizeof(thread_t));
  173.     if (t) {
  174.         ipl_t ipl;
  175.    
  176.         spinlock_initialize(&t->lock, "thread_t_lock");
  177.    
  178.         frame_ks = frame_alloc(FRAME_KA, ONE_FRAME);
  179.         if (THREAD_USER_STACK & flags) {
  180.             frame_us = frame_alloc(FRAME_KA, ONE_FRAME);
  181.         }
  182.  
  183.         ipl = interrupts_disable();
  184.         spinlock_lock(&tidlock);
  185.         t->tid = ++last_tid;
  186.         spinlock_unlock(&tidlock);
  187.         interrupts_restore(ipl);
  188.        
  189.         memsetb(frame_ks, THREAD_STACK_SIZE, 0);
  190.         link_initialize(&t->rq_link);
  191.         link_initialize(&t->wq_link);
  192.         link_initialize(&t->th_link);
  193.         link_initialize(&t->threads_link);
  194.         t->kstack = (__u8 *) frame_ks;
  195.         t->ustack = (__u8 *) frame_us;
  196.        
  197.         context_save(&t->saved_context);
  198.         context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
  199.        
  200.         the_initialize((the_t *) t->kstack);
  201.  
  202.         ipl = interrupts_disable();
  203.         t->saved_context.ipl = interrupts_read();
  204.         interrupts_restore(ipl);
  205.        
  206.         t->thread_code = func;
  207.         t->thread_arg = arg;
  208.         t->ticks = -1;
  209.         t->priority = -1;       /* start in rq[0] */
  210.         t->cpu = NULL;
  211.         t->flags = 0;
  212.         t->state = Entering;
  213.         t->call_me = NULL;
  214.         t->call_me_with = NULL;
  215.        
  216.         timeout_initialize(&t->sleep_timeout);
  217.         t->sleep_queue = NULL;
  218.         t->timeout_pending = 0;
  219.        
  220.         t->rwlock_holder_type = RWLOCK_NONE;
  221.        
  222.         t->task = task;
  223.        
  224.         t->fpu_context_exists=0;
  225.         t->fpu_context_engaged=0;
  226.        
  227.         /*
  228.          * Register this thread in the system-wide list.
  229.          */
  230.         ipl = interrupts_disable();    
  231.         spinlock_lock(&threads_lock);
  232.         list_append(&t->threads_link, &threads_head);
  233.         spinlock_unlock(&threads_lock);
  234.  
  235.         /*
  236.          * Attach to the containing task.
  237.          */
  238.         spinlock_lock(&task->lock);
  239.         list_append(&t->th_link, &task->th_head);
  240.         spinlock_unlock(&task->lock);
  241.  
  242.         interrupts_restore(ipl);
  243.     }
  244.  
  245.     return t;
  246. }
  247.  
  248.  
  249. /** Make thread exiting
  250.  *
  251.  * End current thread execution and switch it to the exiting
  252.  * state. All pending timeouts are executed.
  253.  *
  254.  */
  255. void thread_exit(void)
  256. {
  257.     ipl_t ipl;
  258.  
  259. restart:
  260.     ipl = interrupts_disable();
  261.     spinlock_lock(&THREAD->lock);
  262.     if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
  263.         spinlock_unlock(&THREAD->lock);
  264.         interrupts_restore(ipl);
  265.         goto restart;
  266.     }
  267.     THREAD->state = Exiting;
  268.     spinlock_unlock(&THREAD->lock);
  269.     scheduler();
  270. }
  271.  
  272.  
  273. /** Thread sleep
  274.  *
  275.  * Suspend execution of the current thread.
  276.  *
  277.  * @param sec Number of seconds to sleep.
  278.  *
  279.  */
  280. void thread_sleep(__u32 sec)
  281. {
  282.     thread_usleep(sec*1000000);
  283. }
  284.  
  285.  
  286. /** Thread usleep
  287.  *
  288.  * Suspend execution of the current thread.
  289.  *
  290.  * @param usec Number of microseconds to sleep.
  291.  *
  292.  */
  293. void thread_usleep(__u32 usec)
  294. {
  295.     waitq_t wq;
  296.                  
  297.     waitq_initialize(&wq);
  298.  
  299.     (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
  300. }
  301.  
  302.  
  303. /** Register thread out-of-context invocation
  304.  *
  305.  * Register a function and its argument to be executed
  306.  * on next context switch to the current thread.
  307.  *
  308.  * @param call_me      Out-of-context function.
  309.  * @param call_me_with Out-of-context function argument.
  310.  *
  311.  */
  312. void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
  313. {
  314.     ipl_t ipl;
  315.    
  316.     ipl = interrupts_disable();
  317.     spinlock_lock(&THREAD->lock);
  318.     THREAD->call_me = call_me;
  319.     THREAD->call_me_with = call_me_with;
  320.     spinlock_unlock(&THREAD->lock);
  321.     interrupts_restore(ipl);
  322. }
  323.