WebSVN – HelenOS – Diff – /branches/dynload/kernel/generic/src/proc/thread.c

 /*
  * Copyright (C) 2001-2004 Jakub Jermar
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
+ *
  * - Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  * - Redistributions in binary form must reproduce the above copyright
  *   notice, this list of conditions and the following disclaimer in the
  *   documentation and/or other materials provided with the distribution.
  * - The name of the author may not be used to endorse or promote products
  *   derived from this software without specific prior written permission.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #include <proc/scheduler.h>
 #include <proc/thread.h>
 #include <proc/task.h>
 #include <mm/heap.h>
 #include <mm/frame.h>
 #include <mm/page.h>
 #include <arch/asm.h>
 #include <arch.h>
 #include <synch/synch.h>
 #include <synch/spinlock.h>
 #include <synch/waitq.h>
 #include <synch/rwlock.h>
 #include <cpu.h>
 #include <func.h>
 #include <context.h>
 #include <list.h>
 #include <typedefs.h>
 #include <time/clock.h>
 #include <list.h>
 #include <config.h>
 #include <arch/interrupt.h>
 #include <smp/ipi.h>
 #include <arch/faddr.h>
 #include <arch/atomic.h>
 #include <memstr.h>
 #include <print.h>
+#include <mm/slab.h>
+#include <debug.h>
 char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
 SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
 LIST_INITIALIZE(threads_head);      /**< List of all threads. */
 SPINLOCK_INITIALIZE(tidlock);
 __u32 last_tid = 0;
+static slab_cache_t *thread_slab;
 /** Thread wrapper
+ *
  * This wrapper is provided to ensure that every thread
  * makes a call to thread_exit() when its implementing
  * function returns.
+ *
  * interrupts_disable() is assumed.
+ *
  */
 static void cushion(void)
+{
     void (*f)(void *) = THREAD->thread_code;
     void *arg = THREAD->thread_arg;
     /* this is where each thread wakes up after its creation */
     before_thread_runs();
     spinlock_unlock(&THREAD->lock);
     interrupts_enable();
     f(arg);
     thread_exit();
     /* not reached */
+}
+/** Initialization and allocation for thread_t structure */
+static int thr_constructor(void *obj, int kmflags)
+{
+    thread_t *t = (thread_t *)obj;
+    spinlock_initialize(&t->lock, "thread_t_lock");
+    link_initialize(&t->rq_link);
+    link_initialize(&t->wq_link);
+    link_initialize(&t->th_link);
+    link_initialize(&t->threads_link);
+    t->kstack = (__u8 *)frame_alloc(ONE_FRAME, FRAME_KA | kmflags);
+    if (!t->kstack)
+        return -1;
+    return 0;
+}
+/** Destruction of thread_t object */
+static int thr_destructor(void *obj)
+{
+    thread_t *t = (thread_t *)obj;
+    frame_free((__address) t->kstack);
+    return 1; /* One page freed */
+}
 /** Initialize threads
+ *
  * Initialize kernel threads support.
+ *
  */
 void thread_init(void)
+{
     THREAD = NULL;
     atomic_set(&nrdy,0);
+    thread_slab = slab_cache_create("thread_slab",
+                    sizeof(thread_t),0,
+                    thr_constructor, thr_destructor, 0);
+}
 /** Make thread ready
+ *
  * Switch thread t to the ready state.
+ *
  * @param t Thread to make ready.
+ *
  */
 void thread_ready(thread_t *t)
+{
     cpu_t *cpu;
     runq_t *r;
     ipl_t ipl;
     int i, avg;
     ipl = interrupts_disable();
     spinlock_lock(&t->lock);
     i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
     cpu = CPU;
     if (t->flags & X_WIRED) {
         cpu = t->cpu;
+    }
     spinlock_unlock(&t->lock);
     /*
      * Append t to respective ready queue on respective processor.
      */
     r = &cpu->rq[i];
     spinlock_lock(&r->lock);
     list_append(&t->rq_link, &r->rq_head);
     r->n++;
     spinlock_unlock(&r->lock);
     atomic_inc(&nrdy);
     avg = atomic_get(&nrdy) / config.cpu_active;
     atomic_inc(&cpu->nrdy);
     interrupts_restore(ipl);
+}
+/** Destroy thread memory structure
+ *
+ * Detach thread from all queues, cpus etc. and destroy it.
+ *
+ * Assume thread->lock is held!!
+ */
+void thread_destroy(thread_t *t)
+{
+    ASSERT(t->state == Exiting);
+    ASSERT(t->task);
+    ASSERT(t->cpu);
+    spinlock_lock(&t->cpu->lock);
+    if(t->cpu->fpu_owner==t)
+        t->cpu->fpu_owner=NULL;
+    spinlock_unlock(&t->cpu->lock);
+    if (t->ustack)
+        frame_free((__address) t->ustack);
+    /*
+     * Detach from the containing task.
+     */
+    spinlock_lock(&t->task->lock);
+    list_remove(&t->th_link);
+    spinlock_unlock(&t->task->lock);
+    spinlock_unlock(&t->lock);
+    spinlock_lock(&threads_lock);
+    list_remove(&t->threads_link);
+    spinlock_unlock(&threads_lock);
+    slab_free(thread_slab, t);
+}
 /** Create new thread
+ *
  * Create a new thread.
+ *
  * @param func  Thread's implementing function.
  * @param arg   Thread's implementing function argument.
  * @param task  Task to which the thread belongs.
  * @param flags Thread flags.
+ *
  * @return New thread's structure on success, NULL on failure.
+ *
  */
 thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
+{
     thread_t *t;
-    __address frame_ks, frame_us = NULL;
+    __address frame_us = NULL;
-    t = (thread_t *) malloc(sizeof(thread_t));
+    t = (thread_t *) slab_alloc(thread_slab, 0);
     if (t) {
         ipl_t ipl;
-        spinlock_initialize(&t->lock, "thread_t_lock");
-        frame_ks = frame_alloc(ONE_FRAME, FRAME_KA);
         if (THREAD_USER_STACK & flags) {
             frame_us = frame_alloc(ONE_FRAME, FRAME_KA);
+        }
+        /* Not needed, but good for debugging */
+        memsetb((__address)t->kstack, THREAD_STACK_SIZE, 0);
         ipl = interrupts_disable();
         spinlock_lock(&tidlock);
         t->tid = ++last_tid;
         spinlock_unlock(&tidlock);
         interrupts_restore(ipl);
-        memsetb(frame_ks, THREAD_STACK_SIZE, 0);
-        link_initialize(&t->rq_link);
-        link_initialize(&t->wq_link);
-        link_initialize(&t->th_link);
-        link_initialize(&t->threads_link);
-        t->kstack = (__u8 *) frame_ks;
         t->ustack = (__u8 *) frame_us;
         context_save(&t->saved_context);
         context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
         the_initialize((the_t *) t->kstack);
         ipl = interrupts_disable();
         t->saved_context.ipl = interrupts_read();
         interrupts_restore(ipl);
         t->thread_code = func;
         t->thread_arg = arg;
         t->ticks = -1;
         t->priority = -1;       /* start in rq[0] */
         t->cpu = NULL;
         t->flags = 0;
         t->state = Entering;
         t->call_me = NULL;
         t->call_me_with = NULL;
         timeout_initialize(&t->sleep_timeout);
         t->sleep_queue = NULL;
         t->timeout_pending = 0;
         t->rwlock_holder_type = RWLOCK_NONE;
         t->task = task;
         t->fpu_context_exists=0;
         t->fpu_context_engaged=0;
         /*
          * Register this thread in the system-wide list.
          */
         ipl = interrupts_disable();
         spinlock_lock(&threads_lock);
         list_append(&t->threads_link, &threads_head);
         spinlock_unlock(&threads_lock);
         /*
          * Attach to the containing task.
          */
         spinlock_lock(&task->lock);
         list_append(&t->th_link, &task->th_head);
         spinlock_unlock(&task->lock);
         interrupts_restore(ipl);
+    }
     return t;
+}
 /** Make thread exiting
+ *
  * End current thread execution and switch it to the exiting
  * state. All pending timeouts are executed.
+ *
  */
 void thread_exit(void)
+{
     ipl_t ipl;
 restart:
     ipl = interrupts_disable();
     spinlock_lock(&THREAD->lock);
     if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
         spinlock_unlock(&THREAD->lock);
         interrupts_restore(ipl);
         goto restart;
+    }
     THREAD->state = Exiting;
     spinlock_unlock(&THREAD->lock);
     scheduler();
+}
 /** Thread sleep
+ *
  * Suspend execution of the current thread.
+ *
  * @param sec Number of seconds to sleep.
+ *
  */
 void thread_sleep(__u32 sec)
+{
     thread_usleep(sec*1000000);
+}
 /** Thread usleep
+ *
  * Suspend execution of the current thread.
+ *
  * @param usec Number of microseconds to sleep.
+ *
  */
 void thread_usleep(__u32 usec)
+{
     waitq_t wq;
     waitq_initialize(&wq);
     (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
+}
 /** Register thread out-of-context invocation
+ *
  * Register a function and its argument to be executed
  * on next context switch to the current thread.
+ *
  * @param call_me      Out-of-context function.
  * @param call_me_with Out-of-context function argument.
+ *
  */
 void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
+{
     ipl_t ipl;
     ipl = interrupts_disable();
     spinlock_lock(&THREAD->lock);
     THREAD->call_me = call_me;
     THREAD->call_me_with = call_me_with;
     spinlock_unlock(&THREAD->lock);
     interrupts_restore(ipl);
+}
 /** Print list of threads debug info */
 void thread_print_list(void)
+{
     link_t *cur;
     thread_t *t;
     ipl_t ipl;
     /* Messing with thread structures, avoid deadlock */
     ipl = interrupts_disable();
     spinlock_lock(&threads_lock);
     for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
         t = list_get_instance(cur, thread_t, threads_link);
         printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
         if (t->cpu)
             printf("cpu%d ", t->cpu->id);
         printf("\n");
+    }
     spinlock_unlock(&threads_lock);
     interrupts_enable();
+}

Subversion Repositories HelenOS

(root)/branches/dynload/kernel/generic/src/proc/thread.c @ 3150 – Rev 786 → 787