/* Copyright (c) 2009 The Khronos Group Inc.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and/or associated documentation files (the

 * "Materials"), to deal in the Materials without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sublicense, and/or sell copies of the Materials, and to

 * permit persons to whom the Materials are furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Materials.

 *

 * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.

 */

#ifndef OWF_MESSAGEQUEUE_H_

#define OWF_MESSAGEQUEUE_H_

#include "owftypes.h"

#include "owfsemaphore.h"

#include "owfmutex.h"

#ifdef __cplusplus

extern "C" {

#endif

typedef struct {

    OWFuint                 id;

    void*                   data;

} OWF_MESSAGE;

typedef struct _MSGQUE {

    OWFint                  read;

    OWFint                  write;

} OWF_MESSAGE_QUEUE;

/*

 *  Destroy message queue

 *

 *  \param queue Message queue to destroy

 */

OWF_API_CALL void

OWF_MessageQueue_Destroy(OWF_MESSAGE_QUEUE* queue);

/*

 *  Initialize message queue

 *

 *  \param queue Message queue to initialize

 *  \return 0 if initialization succeeded, < 0 otherwise

 *

 */

OWF_API_CALL OWFint

OWF_MessageQueue_Init(OWF_MESSAGE_QUEUE* queue);

/*

 *  Insert message into message queue (send it to

 *  THE other side)

 *

 *  \param queue Message queue

 *  \param msg Message to send

 *  \param data Message contents

 *

 */

OWF_API_CALL void

OWF_Message_Send(OWF_MESSAGE_QUEUE* queue,

                 OWFuint msg,

                 void* data);

/*

 *  Wait for message

 *

 *  \param queue Message queue

 *  \param msg Where to store the received message

 *  \param timeout Time to wait for the message (microseconds)

 *

 *  \return < 0 if error occurred, 0 if no message was received within

 *  given period of time, > 0 otherwise; received message is stored into

 *  OWF_MESSAGE structure pointed by the msg param

 *

 */

OWF_API_CALL OWFint

OWF_Message_Wait(OWF_MESSAGE_QUEUE* queue,

                 OWF_MESSAGE* msg,

                 OWFint timeout);

#ifdef __cplusplus

}

#endif

#endif