circuitpython/shared-bindings/atexit/__init__.c

/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2021 microDev
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "shared-module/atexit/__init__.h"

//| """Atexit Module
//|
//| This module defines functions to register and unregister cleanup functions.
//| Functions thus registered are automatically executed upon normal vm termination.
//|
//| These functions are run in the reverse order in which they were registered;
//| if you register ``A``, ``B``, and ``C``, they will be run in the order ``C``, ``B``, ``A``.
//|
//| |see_cpython_module| :mod:`cpython:atexit`.
//| """
//| ...
//|

//| def register(
//|     func: Callable[..., Any], *args: Optional[Any], **kwargs: Optional[Any]
//| ) -> Callable[..., Any]:
//|     """Register func as a function to be executed at termination.
//|
//|     Any optional arguments that are to be passed to func must be passed as arguments to `register()`.
//|     It is possible to register the same function and arguments more than once.
//|
//|     At normal program termination (for instance, if `sys.exit()` is called or the vm execution completes),
//|     all functions registered are called in last in, first out order.
//|
//|     If an exception is raised during execution of the exit handler,
//|     a traceback is printed (unless `SystemExit` is raised) and the execution stops.
//|
//|     This function returns func, which makes it possible to use it as a decorator.
//|
//|     """
//|     ...
//|
STATIC mp_obj_t atexit_register(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    shared_module_atexit_register(pos_args[0], (n_args - 1), ((n_args > 1) ? &pos_args[1] : NULL), kw_args);
    return pos_args[0];
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(atexit_register_obj, 1, atexit_register);

//| def unregister(func: Callable[..., Any]) -> None:
//|     """Remove func from the list of functions to be run at termination.
//|
//|     `unregister()` silently does nothing if func was not previously registered. If func has been registered more than once,
//|     every occurrence of that function in the atexit call stack will be removed.
//|
//|     """
//|     ...
//|
STATIC mp_obj_t atexit_unregister(const mp_obj_t self_in) {
    shared_module_atexit_unregister(&self_in);
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(atexit_unregister_obj, atexit_unregister);

STATIC const mp_rom_map_elem_t atexit_module_globals_table[] = {
    // module name
    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_atexit) },
    // module functions
    { MP_ROM_QSTR(MP_QSTR_register), MP_ROM_PTR(&atexit_register_obj) },
    { MP_ROM_QSTR(MP_QSTR_unregister), MP_ROM_PTR(&atexit_unregister_obj) },
};
STATIC MP_DEFINE_CONST_DICT(atexit_module_globals, atexit_module_globals_table);

const mp_obj_module_t atexit_module = {
    .base = { &mp_type_module },
    .globals = (mp_obj_dict_t *)&atexit_module_globals,
};

MP_REGISTER_MODULE(MP_QSTR_atexit, atexit_module, CIRCUITPY_ATEXIT);