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