WebSVN – HelenOS – Diff – /trunk/kernel/generic/src/proc/task.c

 #include <atomic.h>
 #include <synch/spinlock.h>
 #include <synch/waitq.h>
 #include <arch.h>
 #include <panic.h>
+#include <adt/avl.h>
 #include <adt/btree.h>
 #include <adt/list.h>
 #include <ipc/ipc.h>
 #include <security/cap.h>
 #include <memstr.h>
 #ifndef LOADED_PROG_STACK_PAGES_NO
 #define LOADED_PROG_STACK_PAGES_NO 1
 #endif
-/** Spinlock protecting the tasks_btree B+tree. */
+/** Spinlock protecting the tasks_tree AVL tree. */
 SPINLOCK_INITIALIZE(tasks_lock);
-/** B+tree of active tasks.
+/** AVL tree of active tasks.
+ *
- * The task is guaranteed to exist after it was found in the tasks_btree as
+ * The task is guaranteed to exist after it was found in the tasks_tree as
  * long as:
  * @li the tasks_lock is held,
  * @li the task's lock is held when task's lock is acquired before releasing
  *     tasks_lock or
  * @li the task's refcount is greater than 0
+ *
  */
-btree_t tasks_btree;
+avltree_t tasks_tree;
 static task_id_t task_counter = 0;
 /** Initialize tasks
+ *
+ *
  */
 void task_init(void)
+{
     TASK = NULL;
-    btree_create(&tasks_btree);
+    avltree_create(&tasks_tree);
+}
+/*
+ * The idea behind this walker is to remember a single task different from TASK.
+ */
+static bool task_done_walker(avltree_node_t *node, void *arg)
+{
+    task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);
+    task_t **tp = (task_t **) arg;
+    if (t != TASK) {
+        *tp = t;
+        return false;   /* stop walking */
+    }
+    return true;    /* continue the walk */
+}
 /** Kill all tasks except the current task.
+ *
  */
         /* Messing with task structures, avoid deadlock */
         ipl_t ipl = interrupts_disable();
         spinlock_lock(&tasks_lock);
         t = NULL;
-        link_t *cur;
-        for (cur = tasks_btree.leaf_head.next;
+        avltree_walk(&tasks_tree, task_done_walker, &t);
-            cur != &tasks_btree.leaf_head; cur = cur->next) {
-            btree_node_t *node;
-            node = list_get_instance(cur, btree_node_t, leaf_link);
-            unsigned int i;
-            for (i = 0; i < node->keys; i++) {
-                if ((task_t *) node->value[i] != TASK) {
-                    t = (task_t *) node->value[i];
-                    break;
-                }
-            }
-        }
         if (t != NULL) {
             task_id_t id = t->taskid;
             spinlock_unlock(&tasks_lock);
      */
     atomic_inc(&as->refcount);
     spinlock_lock(&tasks_lock);
     ta->taskid = ++task_counter;
+    avltree_node_initialize(&ta->tasks_tree_node);
+    ta->tasks_tree_node.key = ta->taskid;
-    btree_insert(&tasks_btree, (btree_key_t) ta->taskid, (void *) ta, NULL);
+    avltree_insert(&tasks_tree, &ta->tasks_tree_node);
     spinlock_unlock(&tasks_lock);
     interrupts_restore(ipl);
     return ta;
+}
+{
     /*
      * Remove the task from the task B+tree.
      */
     spinlock_lock(&tasks_lock);
-    btree_remove(&tasks_btree, t->taskid, NULL);
+    avltree_delete(&tasks_tree, &t->tasks_tree_node);
     spinlock_unlock(&tasks_lock);
     /*
      * Perform architecture specific task destruction.
      */
+ *
  * @return Task structure address or NULL if there is no such task ID.
  */
 task_t *task_find_by_id(task_id_t id)
+{
-    btree_node_t *leaf;
+    avltree_node_t *node;
-    return (task_t *) btree_search(&tasks_btree, (btree_key_t) id, &leaf);
+    node = avltree_search(&tasks_tree, (avltree_key_t) id);
+    if (node)
+        return avltree_get_instance(node, task_t, tasks_tree_node);
+    return NULL;
+}
 /** Get accounting data of given task.
+ *
  * Note that task lock of 't' must be already held and
     interrupts_restore(ipl);
     return 0;
+}
+static bool task_print_walker(avltree_node_t *node, void *arg)
+{
+    task_t *t = avltree_get_instance(node, task_t, tasks_tree_node);
+    int j;
+    spinlock_lock(&t->lock);
+    uint64_t cycles;
+    char suffix;
+    order(task_get_accounting(t), &cycles, &suffix);
+    printf("%-6llu %-10s %-3ld %#10zx %#10zx %9llu%c %7zd %6zd",
+        t->taskid, t->name, t->context, t, t->as, cycles, suffix,
+        t->refcount, atomic_get(&t->active_calls));
+    for (j = 0; j < IPC_MAX_PHONES; j++) {
+        if (t->phones[j].callee)
+            printf(" %zd:%#zx", j, t->phones[j].callee);
+    }
+    printf("\n");
+    spinlock_unlock(&t->lock);
+    return true;
+}
 /** Print task list */
 void task_print_list(void)
+{
-    link_t *cur;
     ipl_t ipl;
     /* Messing with task structures, avoid deadlock */
     ipl = interrupts_disable();
     spinlock_lock(&tasks_lock);
     printf("taskid name       ctx address    as         cycles     threads "
         "calls  callee\n");
     printf("------ ---------- --- ---------- ---------- ---------- ------- "
         "------ ------>\n");
-    for (cur = tasks_btree.leaf_head.next; cur != &tasks_btree.leaf_head;
-        cur = cur->next) {
-        btree_node_t *node;
-        unsigned int i;
-        node = list_get_instance(cur, btree_node_t, leaf_link);
-        for (i = 0; i < node->keys; i++) {
-            task_t *t;
-            int j;
-            t = (task_t *) node->value[i];
-            spinlock_lock(&t->lock);
-            uint64_t cycles;
-            char suffix;
-            order(task_get_accounting(t), &cycles, &suffix);
+    avltree_walk(&tasks_tree, task_print_walker, NULL);
-            printf("%-6llu %-10s %-3ld %#10zx %#10zx %9llu%c %7zd "
-                "%6zd", t->taskid, t->name, t->context, t, t->as,
-                cycles, suffix, t->refcount,
-                atomic_get(&t->active_calls));
-            for (j = 0; j < IPC_MAX_PHONES; j++) {
-                if (t->phones[j].callee)
-                    printf(" %zd:%#zx", j,
-                        t->phones[j].callee);
-            }
-            printf("\n");
-            spinlock_unlock(&t->lock);
-        }
-    }
     spinlock_unlock(&tasks_lock);
     interrupts_restore(ipl);
+}

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/proc/task.c – Rev 2446 → 2504