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Support multiprocessing in spawn mode #140

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Support multiprocessing in spawn mode #140

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ca45499
Support subprocesses in spawn mode
abdnh Oct 1, 2026
8c5bd32
Use an empty string for sys.executable if subprocesses are not allowed.
freakboy3742 Oct 5, 2026
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1 change: 1 addition & 0 deletions cookiecutter.json
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
"host_arch": "arm64",
"min_os_version": "11.0",
"use_framework": true,
"allow_subprocesses": false,
"_extensions": [
"briefcase.integrations.cookiecutter.PythonVersionExtension",
"briefcase.integrations.cookiecutter.PListExtension"
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5 changes: 5 additions & 0 deletions {{ cookiecutter.format }}/briefcase.toml
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Expand Up @@ -28,7 +28,12 @@ support_path = "Support"
cleanup_paths = [
"Support/Python.xcframework/**/python*/config-*-darwin",
"Support/Python.xcframework/**/pkgconfig",
{% if not cookiecutter.allow_subprocesses -%}
"Support/Python.xcframework/**/Python.framework/Versions/3.*/bin",
"Support/Python.xcframework/**/Python.framework/Versions/3.*/Resources/Python.app",
{% endif -%}
]

icon.16 = "{{ cookiecutter.class_name }}/Assets.xcassets/{{ cookiecutter.formal_name }}.appiconset/icon-16.png"
icon.32 = "{{ cookiecutter.class_name }}/Assets.xcassets/{{ cookiecutter.formal_name }}.appiconset/icon-32.png"
icon.64 = "{{ cookiecutter.class_name }}/Assets.xcassets/{{ cookiecutter.formal_name }}.appiconset/icon-64.png"
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20 changes: 20 additions & 0 deletions {{ cookiecutter.format }}/{{ cookiecutter.class_name }}/main.m
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Expand Up @@ -247,6 +247,26 @@ int main(int argc, char *argv[]) {
setup_stdout(mainBundle);
{% endif -%}

// Point sys.executable at bin/python3 so that the app can start Python subprocesses.
// If the executable doesn't exist, clear sys.executable so that subprocesses
// trying to use sys.executable can't fork-bomb the app.
path = [python_home stringByAppendingPathComponent:@"bin/python3"];
if ([[NSFileManager defaultManager] isExecutableFileAtPath:path]) {
debug_log(@"Setting sys.executable: %@", path);
module_attr = PyUnicode_FromString([path UTF8String]);
} else {
debug_log(@"Clearing sys.executable");
module_attr = PyUnicode_FromString("");
}

if (module_attr == NULL
|| PySys_SetObject("executable", module_attr) < 0
|| PySys_SetObject("_base_executable", module_attr) < 0) {
crash_dialog(@"Could not set sys.executable");
exit(-16);
}
Py_DECREF(module_attr);

// Start the app module.
//
// From here to Py_ObjectCall(runmodule...) is effectively
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