如何同步线程以捕获相同数量的帧？
[英]How to synchronize threads to capture same number of frames?
问题描述
I am developing a Kinect application. 
我正在开发Kinect应用程序。 I have two threads, one for reading joint's values (contains x,y,z coordination of 20 joints) and the other for reading Depth values (76800 short values each frame). 我有两个线程，一个用于读取关节的值（包含20个关节的x，y，z坐标），另一个用于读取深度值（每帧76800个短值）。 I am recording these values starting from pushing my start button until pushing the end button. 从开始按钮到结束按钮，我一直在记录这些值。 I expect to write the same number of frames of joints and depth but i always end up with much joint frame. 我希望编写相同数量的关节框架和深度，但是我总是以很多关节框架告终。 I capture 150 depth frame but 180 joint frame, I thought that it is because of the amount of data that depth is writing into buffer. 我捕获了150个深度帧，但捕获了180个联合帧，我认为这是因为深度写入缓冲区的数据量很大。 joint just write 60 floats in each frame but depth 76800 shorts. 关节每帧只写60个浮子，但深度为76800短裤。
How can i capture equal amount of frames from each? 如何从每个帧中捕获相等数量的帧？ (Kinect capture depth and coordinate with 25 to 30 FPS) （Kinect捕获深度并以25到30 FPS进行协调）
This log also shows the number of each thread called which are not equal: 此日志还显示了每个不相等的被调用线程的数量：
112/11/9 4:19:58: SKELETON
112/11/9 4:19:58: DEPTH
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N
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N
112/11/9 4:20:12: DEPTH
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1 个解决方案
解决方案1
0 2012-12-09 03:07:43
Have a shared table protected by a lock and condition variable that keeps a count of the number of frames of each type that have been captured. 共享表受锁和条件变量保护，该变量对已捕获的每种类型的帧数进行计数。 If either thread sees that it has captured more frames than the other, have it block on the condition variable. 如果一个线程发现它捕获了比另一个线程更多的帧，则将其阻塞在条件变量上。 When either thread finishes acquiring a frame, it increments the count of its type and broadcasts the condition variable. 当任一线程完成获取帧时，它将增加其类型的计数并广播条件变量。
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