1 files changed, 126 insertions, 0 deletions
diff --git a/storage/xtradb/srv/srv0que.c b/storage/xtradb/srv/srv0que.c
new file mode 100644
index 00000000000..344aaed8775
--- /dev/null
+++ b/storage/xtradb/srv/srv0que.c
@@ -0,0 +1,126 @@
+/*****************************************************************************
+
+Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved.
+
+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., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+
+*****************************************************************************/
+
+/******************************************************
+Server query execution
+
+Created 6/5/1996 Heikki Tuuri
+*******************************************************/
+
+#include "srv0que.h"
+
+#include "srv0srv.h"
+#include "sync0sync.h"
+#include "os0thread.h"
+#include "usr0sess.h"
+#include "que0que.h"
+
+/**************************************************************************
+Checks if there is work to do in the server task queue. If there is, the
+thread starts processing a task. Before leaving, it again checks the task
+queue and picks a new task if any exists. This is called by a SRV_WORKER
+thread. */
+UNIV_INTERN
+void
+srv_que_task_queue_check(void)
+/*==========================*/
+{
+	que_thr_t*	thr;
+
+	for (;;) {
+		mutex_enter(&kernel_mutex);
+
+		thr = UT_LIST_GET_FIRST(srv_sys->tasks);
+
+		if (thr == NULL) {
+			mutex_exit(&kernel_mutex);
+
+			return;
+		}
+
+		UT_LIST_REMOVE(queue, srv_sys->tasks, thr);
+
+		mutex_exit(&kernel_mutex);
+
+		que_run_threads(thr);
+	}
+}
+
+/**************************************************************************
+Performs round-robin on the server tasks. This is called by a SRV_WORKER
+thread every second or so. */
+UNIV_INTERN
+que_thr_t*
+srv_que_round_robin(
+/*================*/
+				/* out: the new (may be == thr) query thread
+				to run */
+	que_thr_t*	thr)	/* in: query thread */
+{
+	que_thr_t*	new_thr;
+
+	ut_ad(thr);
+	ut_ad(thr->state == QUE_THR_RUNNING);
+
+	mutex_enter(&kernel_mutex);
+
+	UT_LIST_ADD_LAST(queue, srv_sys->tasks, thr);
+
+	new_thr = UT_LIST_GET_FIRST(srv_sys->tasks);
+
+	mutex_exit(&kernel_mutex);
+
+	return(new_thr);
+}
+
+/**************************************************************************
+Enqueues a task to server task queue and releases a worker thread, if there
+is a suspended one. */
+UNIV_INTERN
+void
+srv_que_task_enqueue_low(
+/*=====================*/
+	que_thr_t*	thr)	/* in: query thread */
+{
+	ut_ad(thr);
+	ut_ad(mutex_own(&kernel_mutex));
+
+	UT_LIST_ADD_LAST(queue, srv_sys->tasks, thr);
+
+	srv_release_threads(SRV_WORKER, 1);
+}
+
+/**************************************************************************
+Enqueues a task to server task queue and releases a worker thread, if there
+is a suspended one. */
+UNIV_INTERN
+void
+srv_que_task_enqueue(
+/*=================*/
+	que_thr_t*	thr)	/* in: query thread */
+{
+	ut_ad(thr);
+
+	ut_a(0);	/* Under MySQL this is never called */
+
+	mutex_enter(&kernel_mutex);
+
+	srv_que_task_enqueue_low(thr);
+
+	mutex_exit(&kernel_mutex);
+}