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emscripten_signal.c

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// To enable signal handling, the embedder should:

// 1. set Module.Py_EmscriptenSignalBuffer = some_shared_array_buffer;

// 2. set the Py_EMSCRIPTEN_SIGNAL_HANDLING flag to 1 as follows:

// Module.HEAP8[Module._Py_EMSCRIPTEN_SIGNAL_HANDLING] = 1

// The address &Py_EMSCRIPTEN_SIGNAL_HANDLING is exported as

// Module._Py_EMSCRIPTEN_SIGNAL_HANDLING.

#include <emscripten.h>

#include "Python.h"

EM_JS(int, _Py_CheckEmscriptenSignals_Helper, (void), {

if (!Module.Py_EmscriptenSignalBuffer) {

return 0;

}

try {

let result = Module.Py_EmscriptenSignalBuffer[0];

Module.Py_EmscriptenSignalBuffer[0] = 0;

return result;

} catch(e) {

#if !defined(NDEBUG)

console.warn("Error occurred while trying to read signal buffer:", e);

#endif

return 0;

}

});

EMSCRIPTEN_KEEPALIVE int Py_EMSCRIPTEN_SIGNAL_HANDLING = 0;

void

_Py_CheckEmscriptenSignals(void)

{

if (!Py_EMSCRIPTEN_SIGNAL_HANDLING) {

return;

}

int signal = _Py_CheckEmscriptenSignals_Helper();

if (signal) {

PyErr_SetInterruptEx(signal);

}

#define PY_EMSCRIPTEN_SIGNAL_INTERVAL 50

int _Py_emscripten_signal_clock = PY_EMSCRIPTEN_SIGNAL_INTERVAL;

void

_Py_CheckEmscriptenSignalsPeriodically(void)

{

if (_Py_emscripten_signal_clock == 0) {

_Py_emscripten_signal_clock = PY_EMSCRIPTEN_SIGNAL_INTERVAL;

_Py_CheckEmscriptenSignals();

}

else if (Py_EMSCRIPTEN_SIGNAL_HANDLING) {

_Py_emscripten_signal_clock--;

}