Initial patch for emscripten / pyodide support #197

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mkoeppe wants to merge 1 commit into sagemath:main from passagemath:emscripten

mkoeppe commented Jan 25, 2024

On the emscripten / pyodide platform, there is limited support for POSIX signals.

As noted in https://docs.python.org/3/library/signal.html#general-rules, in CPython on this platform, "signals are emulated and therefore behave differently. Several functions and signals are not available on these platforms."
https://github.com/python/cpython/blob/main/Python/emscripten_signal.c
https://github.com/python/cpython/blob/main/Modules/signalmodule.c
https://github.com/python/cpython/blob/main/Include/internal/pycore_emscripten_signal.h

Building cysignals succeeds, but import cysignals exits immediately because functions sigaltstack and pthread_create error out.

Here we attempt to provide basic support this platform.

This is to support New packages ppl, pplpy (Parma polyhedra library), cysignals pyodide/pyodide#4407


          src/cysignals/implementation.c [EMSCRIPTEN]: Do not use sigaltstack

b13d2be

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