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 } // namespace renderscript
48 } // namespace android
49 #endif
50