1 files changed, 158 insertions, 0 deletions
diff --git a/usr.sbin/nginx/src/event/ngx_event_timer.c b/usr.sbin/nginx/src/event/ngx_event_timer.c
new file mode 100644
index 00000000000..2931a9f4e2e
--- /dev/null
+++ b/usr.sbin/nginx/src/event/ngx_event_timer.c
@@ -0,0 +1,158 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+
+
+#if (NGX_THREADS)
+ngx_mutex_t  *ngx_event_timer_mutex;
+#endif
+
+
+ngx_thread_volatile 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);
+
+#if (NGX_THREADS)
+
+    if (ngx_event_timer_mutex) {
+        ngx_event_timer_mutex->log = log;
+        return NGX_OK;
+    }
+
+    ngx_event_timer_mutex = ngx_mutex_init(log, 0);
+    if (ngx_event_timer_mutex == NULL) {
+        return NGX_ERROR;
+    }
+
+#endif
+
+    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;
+    }
+
+    ngx_mutex_lock(ngx_event_timer_mutex);
+
+    root = ngx_event_timer_rbtree.root;
+    sentinel = ngx_event_timer_rbtree.sentinel;
+
+    node = ngx_rbtree_min(root, sentinel);
+
+    ngx_mutex_unlock(ngx_event_timer_mutex);
+
+    timer = (ngx_msec_int_t) node->key - (ngx_msec_int_t) 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 ( ;; ) {
+
+        ngx_mutex_lock(ngx_event_timer_mutex);
+
+        root = ngx_event_timer_rbtree.root;
+
+        if (root == sentinel) {
+            return;
+        }
+
+        node = ngx_rbtree_min(root, sentinel);
+
+        /* node->key <= ngx_current_time */
+
+        if ((ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec <= 0)
+        {
+            ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer));
+
+#if (NGX_THREADS)
+
+            if (ngx_threaded && ngx_trylock(ev->lock) == 0) {
+
+                /*
+                 * We can not change the timer of the event that is been
+                 * handling by another thread.  And we can not easy walk
+                 * the rbtree to find a next expired timer so we exit the loop.
+                 * However it should be rare case when the event that is
+                 * been handling has expired timer.
+                 */
+
+                ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
+                               "event %p is busy in expire timers", ev);
+                break;
+            }
+#endif
+
+            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);
+
+            ngx_mutex_unlock(ngx_event_timer_mutex);
+
+#if (NGX_DEBUG)
+            ev->timer.left = NULL;
+            ev->timer.right = NULL;
+            ev->timer.parent = NULL;
+#endif
+
+            ev->timer_set = 0;
+
+#if (NGX_THREADS)
+            if (ngx_threaded) {
+                ev->posted_timedout = 1;
+
+                ngx_post_event(ev, &ngx_posted_events);
+
+                ngx_unlock(ev->lock);
+
+                continue;
+            }
+#endif
+
+            ev->timedout = 1;
+
+            ev->handler(ev);
+
+            continue;
+        }
+
+        break;
+    }
+
+    ngx_mutex_unlock(ngx_event_timer_mutex);
+}