1 files changed, 110 insertions, 0 deletions
diff --git a/storage/xtradb/ut/ut0wqueue.c b/storage/xtradb/ut/ut0wqueue.c
new file mode 100644
index 00000000000..a5c14ac8130
--- /dev/null
+++ b/storage/xtradb/ut/ut0wqueue.c
@@ -0,0 +1,110 @@
+/*****************************************************************************
+
+Copyright (c) 2006, 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
+
+*****************************************************************************/
+
+#include "ut0wqueue.h"
+
+/********************************************************************
+Create a new work queue. */
+UNIV_INTERN
+ib_wqueue_t*
+ib_wqueue_create(void)
+/*===================*/
+			/* out: work queue */
+{
+	ib_wqueue_t*	wq = mem_alloc(sizeof(ib_wqueue_t));
+
+	mutex_create(&wq->mutex, SYNC_WORK_QUEUE);
+
+	wq->items = ib_list_create();
+	wq->event = os_event_create(NULL);
+
+	return(wq);
+}
+
+/********************************************************************
+Free a work queue. */
+UNIV_INTERN
+void
+ib_wqueue_free(
+/*===========*/
+	ib_wqueue_t*	wq)	/* in: work queue */
+{
+	ut_a(!ib_list_get_first(wq->items));
+
+	mutex_free(&wq->mutex);
+	ib_list_free(wq->items);
+	os_event_free(wq->event);
+
+	mem_free(wq);
+}
+
+/********************************************************************
+Add a work item to the queue. */
+UNIV_INTERN
+void
+ib_wqueue_add(
+/*==========*/
+	ib_wqueue_t*	wq,	/* in: work queue */
+	void*		item,	/* in: work item */
+	mem_heap_t*	heap)	/* in: memory heap to use for allocating the
+				list node */
+{
+	mutex_enter(&wq->mutex);
+
+	ib_list_add_last(wq->items, item, heap);
+	os_event_set(wq->event);
+
+	mutex_exit(&wq->mutex);
+}
+
+/********************************************************************
+Wait for a work item to appear in the queue. */
+UNIV_INTERN
+void*
+ib_wqueue_wait(
+				/* out: work item */
+	ib_wqueue_t*	wq)	/* in: work queue */
+{
+	ib_list_node_t*	node;
+
+	for (;;) {
+		os_event_wait(wq->event);
+
+		mutex_enter(&wq->mutex);
+
+		node = ib_list_get_first(wq->items);
+
+		if (node) {
+			ib_list_remove(wq->items, node);
+
+			if (!ib_list_get_first(wq->items)) {
+				/* We must reset the event when the list
+				gets emptied. */
+				os_event_reset(wq->event);
+			}
+
+			break;
+		}
+
+		mutex_exit(&wq->mutex);
+	}
+
+	mutex_exit(&wq->mutex);
+
+	return(node->data);
+}