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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      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 #ifndef ANDROID_RS_FIFO_H
     18 #define ANDROID_RS_FIFO_H
     19 
     20 
     21 #include "rsUtils.h"
     22 
     23 namespace android {
     24 namespace renderscript {
     25 
     26 
     27 // A simple FIFO to be used as a producer / consumer between two
     28 // threads.  One is writer and one is reader.  The common cases
     29 // will not require locking.  It is not threadsafe for multiple
     30 // readers or writers by design.
     31 
     32 class Fifo {
     33 protected:
     34     Fifo();
     35     virtual ~Fifo();
     36 
     37 public:
     38     bool virtual writeAsync(const void *data, size_t bytes, bool waitForSpace = true) = 0;
     39     void virtual writeWaitReturn(void *ret, size_t retSize) = 0;
     40     size_t virtual read(void *data, size_t bytes, bool doWait = true, uint64_t timeToWait = 0) = 0;
     41     void virtual readReturn(const void *data, size_t bytes) = 0;
     42 
     43     void virtual flush() = 0;
     44 
     45 };
     46 
     47 }
     48 }
     49 #endif
     50