1 /** @addtogroup MCD_MCDIMPL_DAEMON_DEV
2  * @{
3  * @file
4  *
5  *
6  * <!-- Copyright Giesecke & Devrient GmbH 2009 - 2012 -->
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. The name of the author may not be used to endorse or promote
17  *    products derived from this software without specific prior
18  *    written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
21  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
22  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
24  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
26  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 #include "NotificationQueue.h"
33 #include <stddef.h>
34 
35 #include "log.h"
36 
37 //------------------------------------------------------------------------------
NotificationQueue(notificationQueue_t * i,notificationQueue_t * o,uint32_t size)38 NotificationQueue::NotificationQueue(
39     notificationQueue_t *i,
40     notificationQueue_t *o,
41     uint32_t size
42 ) : in(i), out(o)
43 {
44     in->hdr.queueSize = size;
45     out->hdr.queueSize = size;
46 }
47 
48 
49 //------------------------------------------------------------------------------
putNotification(notification_t * notification)50 void NotificationQueue::putNotification(
51     notification_t *notification
52 )
53 {
54     mutex.lock();
55     if ((out->hdr.writeCnt - out->hdr.readCnt) < out->hdr.queueSize) {
56         out->notification[out->hdr.writeCnt & (out->hdr.queueSize - 1)]
57         = *notification;
58         out->hdr.writeCnt++;
59     }
60     mutex.unlock();
61 }
62 
63 
64 //------------------------------------------------------------------------------
getNotification(void)65 notification_t *NotificationQueue::getNotification(
66     void
67 )
68 {
69     notification_t *ret = NULL;
70     mutex.lock();
71     if ((in->hdr.writeCnt - in->hdr.readCnt) > 0) {
72         ret = &(in->notification[in->hdr.readCnt & (in->hdr.queueSize - 1)]);
73         in->hdr.readCnt++;
74     }
75     mutex.unlock();
76     return ret;
77 }
78 
79 /** @} */
80