Comment by vlovich123

I recommend at least skimming the paper as it covers this. But essentially you can’t just inject a call at a random point in code to start being a zygote. It’s something you have to plan up front as to the exact point you’re going to fork and that you’re going to do it at the start of program before any threads have started or any files are open and before any locks have been acquired. It’s basically all the challenges of invoking fork at arbitrary points in time.

The reason to do a zygote in the first place could be solved with alternative special APIs that are safer and harder to misuse. But we have fork so there’s not as big of a demand despite the warts.