How to replace sys/sem.h functionality when porting to Android - android

Hey guys I am porting an application from Linux to Android by using Android Studio and NDK. I did my research and it looks like I am going to have a problem down the road. The problem is that Android does not support sys/sem.h calls, in other words semaphore functionality.
Would you be able to give me an advice how I could overcome this problem? Moreover, I have notice that Android offers "Android Binders", is there any way I could use this functionality to solve my problem?
Any help would be appreciated. Thank you for your time.

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Need proper demo for face detection using opencv

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First of all i'll attach a list of links to tutorials and videos i used to develop my opencv face recognition tool, in terms of your problem i think you're missing a key framework, if you follow the link i provided it should work let me know if it does. I know you wanted a demo but the best way to learn this is to follow one of the tutorials i provided.
how to install for mac : https://medium.com/#nuwanprabhath/installing-opencv-in-macos-high-sierra-for-python-3-89c79f0a246a
Tutorials :
https://opencv-python tutroals.readthedocs.io/en/latest/py_tutorials/py_atutorials.html
https://www.youtube.com/watch?v=YY9f-6u2Q_c
https://www.pyimagesearch.com/2018/07/19/opencv-tutorial-a-guide-to-learn-opencv/

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