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      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 //------------------------------------------------------------------------------
     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 //------------------------------------------------------------------------------
     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 //------------------------------------------------------------------------------
     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