1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/* Copyright (c) 2011, Code Aurora Forum. 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 Code Aurora Forum, Inc. 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: State of message queue to be initialized.
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_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__ */
|
