WebSVN – HelenOS – Diff – //branches/rcu/kernel/generic/src/time/clock.c

         } else
             uptime->useconds += 1000000 / HZ;
+    }
+}
-#if defined CONFIG_TIMEOUT_AVL_TREE || \
+#if defined CONFIG_TIMEOUT_AVL_TREE
-    defined CONFIG_TIMEOUT_EXTAVL_TREE
 /** Clock routine
+ *
  * Clock routine executed from clock interrupt handler
  * (assuming interrupts_disable()'d). Runs expired timeouts
     timeout_handler_t f;
     void *arg;
     count_t missed_clock_ticks = CPU->missed_clock_ticks;
     uint64_t *i = &(CPU->timeout_active_tree.base);
     uint64_t absolute_clock_ticks = *i + missed_clock_ticks;
-#if defined CONFIG TIMEOUT_AVL_TREE
     avltree_node_t *expnode;
+    /*
+     * To avoid lock ordering problems,
+     * run all expired timeouts as you visit them.
+     */
+    for (; *i <= absolute_clock_ticks; (*i)++) {
+        /*
+         * Basetime is encreased by missed clock ticks + 1 !!
+         */
+        clock_update_counters();
+        spinlock_lock(&CPU->timeoutlock);
+        /*
+         * Check whether first timeout (with the smallest key in the tree) time out. If so perform
+         * callback function and try next timeout (more timeouts can have same timeout).
+         */
+        while ((expnode = avltree_find_min(&CPU->timeout_active_tree)) != NULL) {
+            h = avltree_get_instance(expnode,timeout_t,node);
+            spinlock_lock(&h->lock);
+            if (expnode->key != *i) {
+                spinlock_unlock(&h->lock);
+                break;
+            }
+            /*
+             * Delete minimal key from the tree and repair tree structure in
+             * logarithmic time.
+             */
+            avltree_delete_min(&CPU->timeout_active_tree);
+            f = h->handler;
+            arg = h->arg;
+            timeout_reinitialize(h);
+            spinlock_unlock(&h->lock);
+            spinlock_unlock(&CPU->timeoutlock);
+            f(arg);
+            spinlock_lock(&CPU->timeoutlock);
+        }
+        spinlock_unlock(&CPU->timeoutlock);
+    }
+    CPU->missed_clock_ticks = 0;
+    /*
+     * Do CPU usage accounting and find out whether to preempt THREAD.
+     */
+    if (THREAD) {
+        uint64_t ticks;
+        spinlock_lock(&CPU->lock);
+        CPU->needs_relink += 1 + missed_clock_ticks;
+        spinlock_unlock(&CPU->lock);
+        spinlock_lock(&THREAD->lock);
+        if ((ticks = THREAD->ticks)) {
+            if (ticks >= 1 + missed_clock_ticks)
+                THREAD->ticks -= 1 + missed_clock_ticks;
+            else
+                THREAD->ticks = 0;
+        }
+        spinlock_unlock(&THREAD->lock);
+        if (!ticks && !PREEMPTION_DISABLED) {
+            scheduler();
+        }
+    }
+}
 #elif defined CONFIG_TIMEOUT_EXTAVL_TREE
+/** Clock routine
+ *
+ * Clock routine executed from clock interrupt handler
+ * (assuming interrupts_disable()'d). Runs expired timeouts
+ * and preemptive scheduling.
+ *
+ */
+void clock(void)
+{
+    timeout_t *h;
+    timeout_handler_t f;
+    void *arg;
+    count_t missed_clock_ticks = CPU->missed_clock_ticks;
+    uint64_t *i = &(CPU->timeout_active_tree.base);
+    uint64_t absolute_clock_ticks = *i + missed_clock_ticks;
     extavltree_node_t *expnode;
-#endif
     /*
      * To avoid lock ordering problems,
      * run all expired timeouts as you visit them.
      */
             /*
              * Delete first node in the list and repair tree structure in
              * constant time.
              */
-#if defined CONFIG TIMEOUT_AVL_TREE
-            avltree_delete_min(&CPU->timeout_active_tree);
-#elif defined CONFIG_TIMEOUT_EXTAVL_TREE
             extavltree_delete_min(&CPU->timeout_active_tree);
-#endif
             f = h->handler;
             arg = h->arg;
             timeout_reinitialize(h);
             spinlock_unlock(&h->lock);
  * and preemptive scheduling.
+ *
  */
 void clock(void)
+{
-    extavltree_node_t *expnode;
+    extavlreltree_node_t *expnode;
     timeout_t *h;
     timeout_handler_t f;
     void *arg;
     count_t missed_clock_ticks = CPU->missed_clock_ticks;
     int i;
         /*
          * Check whether first timeout in list time out. If so perform callback function and try
          * next timeout (more timeouts can have same timeout).
          */
         while ((expnode = CPU->timeout_active_tree.head.next) != &(CPU->timeout_active_tree.head)) {
-            h = list_get_instance(l, timeout_t, link);
+            h = extavlreltree_get_instance(expnode,timeout_t,node);
             spinlock_lock(&h->lock);
             if (expnode->key != 0) {
                 expnode->key--;
                 spinlock_unlock(&h->lock);
                 break;
             /*
              * Delete first node in the list and repair tree structure in
              * constant time. Be careful of expnode's key, it must be 0!
              */
-            extavltree_delete_min(&CPU->timeout_active_tree);
+            extavlreltree_delete_min(&CPU->timeout_active_tree);
             f = h->handler;
             arg = h->arg;
             timeout_reinitialize(h);
             spinlock_unlock(&h->lock);

Subversion Repositories HelenOS

(root)//branches/rcu/kernel/generic/src/time/clock.c – Rev 2416 → 2421