David Rayna

Within a single Python program, there should be little issue, but would other processes or external hardware always see bits tested and changed in the same order? I no longer have an issue of wrong GPIO changing among simultaneous C++ & Python programs since I corrected a C++ code mistake in using the special set & clear addresses in the gpio_map. I had seen some examples of C GPIO code using __sync_synchronize() so I was thinking there was a concern. CPU behavior or overhead in Python might assure...

Shouldn't __sync_synchronize() be used after writes and before IO reads ?