Merge commit '484a904fa7' as 'nginx'

nginx/src/event/ngx_event_timer.c

@@ -0,0 +1,126 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+
+
+ngx_rbtree_t              ngx_event_timer_rbtree;
+static ngx_rbtree_node_t  ngx_event_timer_sentinel;
+
+/*
+ * the event timer rbtree may contain the duplicate keys, however,
+ * it should not be a problem, because we use the rbtree to find
+ * a minimum timer value only
+ */
+
+ngx_int_t
+ngx_event_timer_init(ngx_log_t *log)
+{
+    ngx_rbtree_init(&ngx_event_timer_rbtree, &ngx_event_timer_sentinel,
+                    ngx_rbtree_insert_timer_value);
+
+    return NGX_OK;
+}
+
+
+ngx_msec_t
+ngx_event_find_timer(void)
+{
+    ngx_msec_int_t      timer;
+    ngx_rbtree_node_t  *node, *root, *sentinel;
+
+    if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) {
+        return NGX_TIMER_INFINITE;
+    }
+
+    root = ngx_event_timer_rbtree.root;
+    sentinel = ngx_event_timer_rbtree.sentinel;
+
+    node = ngx_rbtree_min(root, sentinel);
+
+    timer = (ngx_msec_int_t) (node->key - ngx_current_msec);
+
+    return (ngx_msec_t) (timer > 0 ? timer : 0);
+}
+
+
+void
+ngx_event_expire_timers(void)
+{
+    ngx_event_t        *ev;
+    ngx_rbtree_node_t  *node, *root, *sentinel;
+
+    sentinel = ngx_event_timer_rbtree.sentinel;
+
+    for ( ;; ) {
+        root = ngx_event_timer_rbtree.root;
+
+        if (root == sentinel) {
+            return;
+        }
+
+        node = ngx_rbtree_min(root, sentinel);
+
+        /* node->key > ngx_current_msec */
+
+        if ((ngx_msec_int_t) (node->key - ngx_current_msec) > 0) {
+            return;
+        }
+
+        ev = ngx_rbtree_data(node, ngx_event_t, timer);
+
+        ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
+                       "event timer del: %d: %M",
+                       ngx_event_ident(ev->data), ev->timer.key);
+
+        ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
+
+#if (NGX_DEBUG)
+        ev->timer.left = NULL;
+        ev->timer.right = NULL;
+        ev->timer.parent = NULL;
+#endif
+
+        ev->timer_set = 0;
+
+        ev->timedout = 1;
+
+        ev->handler(ev);
+    }
+}
+
+
+ngx_int_t
+ngx_event_no_timers_left(void)
+{
+    ngx_event_t        *ev;
+    ngx_rbtree_node_t  *node, *root, *sentinel;
+
+    sentinel = ngx_event_timer_rbtree.sentinel;
+    root = ngx_event_timer_rbtree.root;
+
+    if (root == sentinel) {
+        return NGX_OK;
+    }
+
+    for (node = ngx_rbtree_min(root, sentinel);
+         node;
+         node = ngx_rbtree_next(&ngx_event_timer_rbtree, node))
+    {
+        ev = ngx_rbtree_data(node, ngx_event_t, timer);
+
+        if (!ev->cancelable) {
+            return NGX_AGAIN;
+        }
+    }
+
+    /* only cancelable timers left */
+
+    return NGX_OK;
+}