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I read that the V8 Javascript engine is a just in time compiler. And that PyPy is a Python interpreter that is also a just in time compiler. PyPy is known for having a GIL in the presence of multiple threads.
Does the V8 Javascript engine have something equivalent to a global interpreter lock (GIL) to deal with web worker threads?
And do all dynamic languages have problems dealing with multi-core and if so why do the JIT compilers have problems with a GIL?
Chromium Web Workers are implemented on top of V8 Isolates. Each Isolate is essentially a completely independent instance of V8 VM. Many Isolates can coexist in the same process and execute JavaScript code concurrently.
However each Isolate can only be owned by a single thread at any given moment of time. There is an Isolate level locking mechanism that embedder must use to ensure exclusive access to an Isolate.