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      1 /*
      2  * Copyright (C) Texas Instruments - http://www.ti.com/
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 
     18 
     19 #ifndef __MESSAGEQUEUE_H__
     20 #define __MESSAGEQUEUE_H__
     21 
     22 #include "DebugUtils.h"
     23 #include <stdint.h>
     24 
     25 #ifdef MSGQ_DEBUG
     26 #   define MSGQ_LOGDA DBGUTILS_LOGDA
     27 #   define MSGQ_LOGDB DBGUTILS_LOGDB
     28 #else
     29 #   define MSGQ_LOGDA(str)
     30 #   define MSGQ_LOGDB(str, ...)
     31 #endif
     32 
     33 #define MSGQ_LOGEA DBGUTILS_LOGEA
     34 #define MSGQ_LOGEB DBGUTILS_LOGEB
     35 
     36 namespace Ti {
     37 namespace Utils {
     38 
     39 ///Message type
     40 struct Message
     41 {
     42     unsigned int command;
     43     void*        arg1;
     44     void*        arg2;
     45     void*        arg3;
     46     void*        arg4;
     47     int64_t     id;
     48 };
     49 
     50 ///Message queue implementation
     51 class MessageQueue
     52 {
     53 public:
     54 
     55     MessageQueue();
     56     ~MessageQueue();
     57 
     58     ///Get a message from the queue
     59     android::status_t get(Message*);
     60 
     61     ///Get the input file descriptor of the message queue
     62     int getInFd();
     63 
     64     ///Set the input file descriptor for the message queue
     65     void setInFd(int fd);
     66 
     67     ///Queue a message
     68     android::status_t put(Message*);
     69 
     70     ///Returns if the message queue is empty or not
     71     bool isEmpty();
     72 
     73     void clear();
     74 
     75     ///Force whether the message queue has message or not
     76     void setMsg(bool hasMsg=false);
     77 
     78     ///Wait for message in maximum three different queues with a timeout
     79     static int waitForMsg(MessageQueue *queue1, MessageQueue *queue2=0, MessageQueue *queue3=0, int timeout = 0);
     80 
     81     bool hasMsg()
     82     {
     83       return mHasMsg;
     84     }
     85 
     86 private:
     87     int fd_read;
     88     int fd_write;
     89     bool mHasMsg;
     90 };
     91 
     92 } // namespace Utils
     93 } // namespace Ti
     94 
     95 
     96 
     97 
     98 #endif
     99