Adding upstream version 1:10.11.6.upstream/1%10.11.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 142 insertions, 0 deletions

diff --git a/sql/scheduler.cc b/sql/scheduler.cc
new file mode 100644
index 00000000..7261c5f3
--- /dev/null
+++ b/sql/scheduler.cc
@@ -0,0 +1,142 @@
+/* Copyright (c) 2007, 2013, Oracle and/or its affiliates.
+   Copyright (c) 2012, 2014, SkySQL Ab.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+/*
+  Implementation for the thread scheduler
+*/
+
+#ifdef USE_PRAGMA_INTERFACE
+#pragma implementation
+#endif
+
+#include "mariadb.h"
+#include "mysqld.h"
+#include "scheduler.h"
+#include "sql_class.h"
+#include "sql_callback.h"
+#include <violite.h>
+
+/** @internal
+  Helper functions to allow mysys to call the thread scheduler when
+  waiting for locks.
+*/
+
+/**@{*/
+extern "C"
+{
+static void scheduler_wait_lock_begin(void) { 
+  thd_wait_begin(NULL, THD_WAIT_TABLE_LOCK);
+}
+
+static void scheduler_wait_lock_end(void) {
+  thd_wait_end(NULL);
+}
+
+static void scheduler_wait_sync_begin(void) {
+  thd_wait_begin(NULL, THD_WAIT_SYNC);
+}
+
+static void scheduler_wait_sync_end(void) {
+  thd_wait_end(NULL);
+}
+
+static void scheduler_wait_net_begin(void) {
+   thd_wait_begin(NULL, THD_WAIT_NET);
+}
+
+static void scheduler_wait_net_end(void) {
+   thd_wait_end(NULL);
+}
+
+};
+/**@}*/
+
+/**
+  Common scheduler init function.
+
+  The scheduler is either initialized by calling
+  one_thread_scheduler() or one_thread_per_connection_scheduler() in
+  mysqld.cc, so this init function will always be called.
+ */
+
+void scheduler_init()
+{
+  thr_set_lock_wait_callback(scheduler_wait_lock_begin,
+                             scheduler_wait_lock_end);
+  thr_set_sync_wait_callback(scheduler_wait_sync_begin,
+                             scheduler_wait_sync_end);
+
+  vio_set_wait_callback(scheduler_wait_net_begin,
+    scheduler_wait_net_end);
+}
+
+
+/**
+  Kill notification callback,  used by  one-thread-per-connection
+  and threadpool scheduler.
+
+  Wakes up a thread that is stuck in read/poll/epoll/event-poll 
+  routines used by threadpool, such that subsequent attempt to 
+  read from  client connection will result in IO error.
+*/
+
+void post_kill_notification(THD *thd)
+{
+  DBUG_ENTER("post_kill_notification");
+  if (current_thd == thd || thd->system_thread)
+    DBUG_VOID_RETURN;
+
+  if (thd->net.vio)
+    vio_shutdown(thd->net.vio, SHUT_RD);
+  DBUG_VOID_RETURN;
+}
+
+/*
+  Initialize scheduler for --thread-handling=one-thread-per-connection
+*/
+
+#ifndef EMBEDDED_LIBRARY
+
+void one_thread_per_connection_scheduler(scheduler_functions *func,
+    ulong *arg_max_connections,
+    Atomic_counter<uint> *arg_connection_count)
+{
+  scheduler_init();
+  func->max_threads= *arg_max_connections + 1;
+  func->max_connections= arg_max_connections;
+  func->connection_count= arg_connection_count;
+  func->add_connection= create_thread_to_handle_connection;
+  func->post_kill_notification= post_kill_notification;
+}
+#else
+void handle_connection_in_main_thread(CONNECT *connect)
+{
+}
+#endif
+
+/*
+  Initialize scheduler for --thread-handling=no-threads
+*/
+
+void one_thread_scheduler(scheduler_functions *func,
+    Atomic_counter<uint> *arg_connection_count)
+{
+  scheduler_init();
+  func->max_threads= 1;
+  func->max_connections= &max_connections;
+  func->connection_count= arg_connection_count;
+  func->add_connection= handle_connection_in_main_thread;
+}