This is an old copy of the Python FAQ. The information here may be outdated.

Can't you emulate threads in the interpreter instead of relying on an OS-specific thread implementation?

The CPython interpreter pushes at least one C stack frame for each Python stack frame. Also, extensions can call back into Python at basically any time. Therefore, a complete threads implementation requires thread support for C.

Stackless Python is a customized version of CPython. Stackless adds support for microthreads (also called tasklets), which are primarily based on cooperative context switching. Stackless also provides communication and serialization support for tasklets.

CATEGORY: general cpython


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