2020-08-02 09:55:00 -04:00
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/* Copyright (c) 2011, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __MSG_Q_H__
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#define __MSG_Q_H__
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#include <stdlib.h>
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/** Linked List Return Codes */
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typedef enum
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{
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eMSG_Q_SUCCESS = 0,
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/**< Request was successful. */
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eMSG_Q_FAILURE_GENERAL = -1,
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/**< Failed because of a general failure. */
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eMSG_Q_INVALID_PARAMETER = -2,
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/**< Failed because the request contained invalid parameters. */
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eMSG_Q_INVALID_HANDLE = -3,
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/**< Failed because an invalid handle was specified. */
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eMSG_Q_UNAVAILABLE_RESOURCE = -4,
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/**< Failed because an there were not enough resources. */
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eMSG_Q_INSUFFICIENT_BUFFER = -5,
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/**< Failed because an the supplied buffer was too small. */
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2021-06-25 16:21:58 -04:00
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eMSG_Q_EMPTY = -6
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/**< Failed because list is empty. */
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2020-08-02 09:55:00 -04:00
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}msq_q_err_type;
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/*===========================================================================
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FUNCTION msg_q_init
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DESCRIPTION
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Initializes internal structures for message queue.
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msg_q_data: pointer to an opaque Q handle to be returned; NULL if fails
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DEPENDENCIES
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N/A
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RETURN VALUE
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Look at error codes above.
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SIDE EFFECTS
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N/A
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===========================================================================*/
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msq_q_err_type msg_q_init(void** msg_q_data);
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/*===========================================================================
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FUNCTION msg_q_init2
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DESCRIPTION
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Initializes internal structures for message queue.
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DEPENDENCIES
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N/A
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RETURN VALUE
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opaque handle to the Q created; NULL if create fails
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SIDE EFFECTS
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N/A
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===========================================================================*/
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const void* msg_q_init2();
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/*===========================================================================
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FUNCTION msg_q_destroy
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DESCRIPTION
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Releases internal structures for message queue.
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msg_q_data: State of message queue to be released.
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DEPENDENCIES
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N/A
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RETURN VALUE
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Look at error codes above.
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SIDE EFFECTS
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N/A
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===========================================================================*/
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msq_q_err_type msg_q_destroy(void** msg_q_data);
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/*===========================================================================
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FUNCTION msg_q_snd
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DESCRIPTION
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Sends data to the message queue. The passed in data pointer
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is not modified or freed. Passed in msg_obj is expected to live throughout
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the use of the msg_q (i.e. data is not allocated internally)
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msg_q_data: Message Queue to add the element to.
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msgp: Pointer to data to add into message queue.
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dealloc: Function used to deallocate memory for this element. Pass NULL
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if you do not want data deallocated during a flush operation
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DEPENDENCIES
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N/A
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RETURN VALUE
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Look at error codes above.
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SIDE EFFECTS
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N/A
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===========================================================================*/
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msq_q_err_type msg_q_snd(void* msg_q_data, void* msg_obj, void (*dealloc)(void*));
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/*===========================================================================
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FUNCTION msg_q_rcv
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DESCRIPTION
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Retrieves data from the message queue. msg_obj is the oldest message received
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and pointer is simply removed from message queue.
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msg_q_data: Message Queue to copy data from into msgp.
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msg_obj: Pointer to space to copy msg_q contents to.
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DEPENDENCIES
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N/A
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RETURN VALUE
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Look at error codes above.
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SIDE EFFECTS
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N/A
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===========================================================================*/
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msq_q_err_type msg_q_rcv(void* msg_q_data, void** msg_obj);
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/*===========================================================================
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FUNCTION msg_q_rmv
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DESCRIPTION
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Remove data from the message queue. msg_obj is the oldest message received
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and pointer is simply removed from message queue.
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msg_q_data: Message Queue to copy data from into msgp.
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msg_obj: Pointer to space to copy msg_q contents to.
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DEPENDENCIES
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N/A
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RETURN VALUE
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Look at error codes above.
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SIDE EFFECTS
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N/A
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===========================================================================*/
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msq_q_err_type msg_q_rmv(void* msg_q_data, void** msg_obj);
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/*===========================================================================
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FUNCTION msg_q_flush
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DESCRIPTION
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Function removes all elements from the message queue.
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msg_q_data: Message Queue to remove elements from.
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DEPENDENCIES
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N/A
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RETURN VALUE
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Look at error codes above.
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SIDE EFFECTS
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N/A
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===========================================================================*/
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msq_q_err_type msg_q_flush(void* msg_q_data);
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/*===========================================================================
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FUNCTION msg_q_unblock
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DESCRIPTION
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This function will stop use of the message queue. All waiters will wake up
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and likely receive nothing from the queue resulting in a negative return
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value. The message queue can no longer be used until it is destroyed
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and initialized again after calling this function.
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msg_q_data: Message queue to unblock.
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DEPENDENCIES
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N/A
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RETURN VALUE
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Look at error codes above.
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SIDE EFFECTS
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N/A
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===========================================================================*/
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msq_q_err_type msg_q_unblock(void* msg_q_data);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __MSG_Q_H__ */
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