Events: removed broken thread support from event timers.

It's mostly dead code.  And the idea of thread support for this task has
been deprecated.

src/core/ngx_rbtree.c

diff --git a/src/core/ngx_rbtree.c b/src/core/ngx_rbtree.c
index 914ca7e..6c66f40 100644
--- a/src/core/ngx_rbtree.c
+++ b/src/core/ngx_rbtree.c
@@ -22,8 +22,7 @@
 
 
 void
-ngx_rbtree_insert(ngx_thread_volatile ngx_rbtree_t *tree,
-    ngx_rbtree_node_t *node)
+ngx_rbtree_insert(ngx_rbtree_t *tree, ngx_rbtree_node_t *node)
 {
     ngx_rbtree_node_t  **root, *temp, *sentinel;
 
@@ -155,8 +154,7 @@
 
 
 void
-ngx_rbtree_delete(ngx_thread_volatile ngx_rbtree_t *tree,
-    ngx_rbtree_node_t *node)
+ngx_rbtree_delete(ngx_rbtree_t *tree, ngx_rbtree_node_t *node)
 {
     ngx_uint_t           red;
     ngx_rbtree_node_t  **root, *sentinel, *subst, *temp, *w;

src/core/ngx_rbtree.h

diff --git a/src/core/ngx_rbtree.h b/src/core/ngx_rbtree.h
index 6e47a5b..1d33e3f 100644
--- a/src/core/ngx_rbtree.h
+++ b/src/core/ngx_rbtree.h
@@ -48,10 +48,8 @@
     (tree)->insert = i
 
 
-void ngx_rbtree_insert(ngx_thread_volatile ngx_rbtree_t *tree,
-    ngx_rbtree_node_t *node);
-void ngx_rbtree_delete(ngx_thread_volatile ngx_rbtree_t *tree,
-    ngx_rbtree_node_t *node);
+void ngx_rbtree_insert(ngx_rbtree_t *tree, ngx_rbtree_node_t *node);
+void ngx_rbtree_delete(ngx_rbtree_t *tree, ngx_rbtree_node_t *node);
 void ngx_rbtree_insert_value(ngx_rbtree_node_t *root, ngx_rbtree_node_t *node,
     ngx_rbtree_node_t *sentinel);
 void ngx_rbtree_insert_timer_value(ngx_rbtree_node_t *root,

src/event/ngx_event_timer.c

diff --git a/src/event/ngx_event_timer.c b/src/event/ngx_event_timer.c
index 1075586..db43e26 100644
--- a/src/event/ngx_event_timer.c
+++ b/src/event/ngx_event_timer.c
@@ -10,13 +10,8 @@
 #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;
+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,
@@ -30,20 +25,6 @@
     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;
 }
 
@@ -58,15 +39,11 @@
         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_current_msec);
 
     return (ngx_msec_t) (timer > 0 ? timer : 0);
@@ -82,9 +59,6 @@
     sentinel = ngx_event_timer_rbtree.sentinel;
 
     for ( ;; ) {
-
-        ngx_mutex_lock(ngx_event_timer_mutex);
-
         root = ngx_event_timer_rbtree.root;
 
         if (root == sentinel) {
@@ -104,8 +78,6 @@
 
             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;
@@ -123,6 +95,4 @@
 
         break;
     }
-
-    ngx_mutex_unlock(ngx_event_timer_mutex);
 }

src/event/ngx_event_timer.h

diff --git a/src/event/ngx_event_timer.h b/src/event/ngx_event_timer.h
index ec9b316..df55d3c 100644
--- a/src/event/ngx_event_timer.h
+++ b/src/event/ngx_event_timer.h
@@ -24,12 +24,7 @@
 void ngx_event_expire_timers(void);
 
 
-#if (NGX_THREADS)
-extern ngx_mutex_t  *ngx_event_timer_mutex;
-#endif
-
-
-extern ngx_thread_volatile ngx_rbtree_t  ngx_event_timer_rbtree;
+extern ngx_rbtree_t  ngx_event_timer_rbtree;
 
 
 static ngx_inline void
@@ -39,12 +34,8 @@
                    "event timer del: %d: %M",
                     ngx_event_ident(ev->data), ev->timer.key);
 
-    ngx_mutex_lock(ngx_event_timer_mutex);
-
     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;
@@ -89,12 +80,8 @@
                    "event timer add: %d: %M:%M",
                     ngx_event_ident(ev->data), timer, ev->timer.key);
 
-    ngx_mutex_lock(ngx_event_timer_mutex);
-
     ngx_rbtree_insert(&ngx_event_timer_rbtree, &ev->timer);
 
-    ngx_mutex_unlock(ngx_event_timer_mutex);
-
     ev->timer_set = 1;
 }
 

src/os/unix/ngx_process_cycle.c

diff --git a/src/os/unix/ngx_process_cycle.c b/src/os/unix/ngx_process_cycle.c
index 6c84ba8..1963944 100644
--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -1213,7 +1213,6 @@
 
             /* STUB */
             ngx_done_events(cycle);
-            ngx_mutex_destroy(ngx_event_timer_mutex);
 
             return;
         }