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+// Emacs style mode select -*- C++ -*-
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 2009 Simon Howard
+//
+// 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; either version 2
+// of the License, or (at your option) any later version.
+//
+// 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.
+//
+// DESCRIPTION:
+// OPL callback queue.
+//
+//-----------------------------------------------------------------------------
+
+#ifndef OPL_QUEUE_H
+#define OPL_QUEUE_H
+
+#include "opl.h"
+
+typedef struct opl_callback_queue_s opl_callback_queue_t;
+
+opl_callback_queue_t *OPL_Queue_Create(void);
+int OPL_Queue_IsEmpty(opl_callback_queue_t *queue);
+void OPL_Queue_Clear(opl_callback_queue_t *queue);
+void OPL_Queue_Destroy(opl_callback_queue_t *queue);
+void OPL_Queue_Push(opl_callback_queue_t *queue,
+ opl_callback_t callback, void *data,
+ unsigned int time);
+int OPL_Queue_Pop(opl_callback_queue_t *queue,
+ opl_callback_t *callback, void **data);
+unsigned int OPL_Queue_Peek(opl_callback_queue_t *queue);
+
+#endif /* #ifndef OPL_QUEUE_H */
+