ros subscriber is interrupted by ginput

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Jin Dai 2016-12-29

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https://ww2.mathworks.cn/matlabcentral/answers/318550-ros-subscriber-is-interrupted-by-ginput

回答： Sebastian Castro 2017-9-19

I have a ginput command in my ros subscriber callback, which causes an interruption of the subscriber. The callback is entered once, and then it stops spinning. When I comment out ginput command, the callback is called continuously.

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Geoff Hayes 2016-12-30

Jin - doesn't the call to ginput "block" and so you are waiting for the user (?) to choose a point on the axes? What are you expecting to happen with the call to ginput?

Jin Dai 2016-12-30

I deleted most codes to show you only the code structure. I clicked a point and found nearest neighbors of this clicked point. After this, it exits the callback, and never enters it again.

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回答（1 个）

Sebastian Castro 2017-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/318550-ros-subscriber-is-interrupted-by-ginput#answer_282221

This is expected, sorry to say.

Recall that the MATLAB environment is single-threaded, with the exception of optimized math functions (which you can't control as a user), or if you're using the Parallel Computing Toolbox to explicitly assign tasks to multiple cores.

So, a blocking operation like ginput means your subscriber won't be receiving any messages until you free up computational resources.

- Sebastian