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py: Implement new sys.atexit feature. 

This patch implements a new sys.atexit function which registers a function
that is later executed when the main script ends.  It is configurable via
MICROPY_PY_SYS_ATEXIT, disabled by default.

This is not compliant with CPython, rather it can be used to implement a
CPython compatible "atexit" module if desired (similar to how
sys.print_exception can be used to implement functionality of the
"traceback" module).
This commit is contained in:
Milan Rossa 2019-08-05 15:06:41 +02:00 committed by Damien George
parent 2ccf030fd1
commit cb3647004f
4 changed files with 27 additions and 0 deletions
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13
py/modsys.c
View File

@ -146,6 +146,16 @@ STATIC mp_obj_t mp_sys_getsizeof(mp_obj_t obj) {
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_sys_getsizeof_obj, mp_sys_getsizeof);
#endif
#if MICROPY_PY_SYS_ATEXIT
// atexit(callback): Callback is called when sys.exit is called.
STATIC mp_obj_t mp_sys_atexit(mp_obj_t obj) {
mp_obj_t old = MP_STATE_VM(sys_exitfunc);
MP_STATE_VM(sys_exitfunc) = obj;
return old;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_sys_atexit_obj, mp_sys_atexit);
#endif
STATIC const mp_rom_map_elem_t mp_module_sys_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_sys) },
@ -201,6 +211,9 @@ STATIC const mp_rom_map_elem_t mp_module_sys_globals_table[] = {
*/
{ MP_ROM_QSTR(MP_QSTR_print_exception), MP_ROM_PTR(&mp_sys_print_exception_obj) },
#if MICROPY_PY_SYS_ATEXIT
{ MP_ROM_QSTR(MP_QSTR_atexit), MP_ROM_PTR(&mp_sys_atexit_obj) },
#endif
};
STATIC MP_DEFINE_CONST_DICT(mp_module_sys_globals, mp_module_sys_globals_table);

5
py/mpconfig.h
View File

@ -1161,6 +1161,11 @@ typedef double mp_float_t;
#define MICROPY_PY_SYS_EXIT (1)
#endif
// Whether to provide "sys.atexit" function (MicroPython extension)
#ifndef MICROPY_PY_SYS_ATEXIT
#define MICROPY_PY_SYS_ATEXIT (0)
#endif
// Whether to provide "sys.getsizeof" function
#ifndef MICROPY_PY_SYS_GETSIZEOF
#define MICROPY_PY_SYS_GETSIZEOF (0)

5
py/mpstate.h
View File

@ -149,6 +149,11 @@ typedef struct _mp_state_vm_t {
mp_obj_base_t *cur_exception;
#endif
#if MICROPY_PY_SYS_ATEXIT
// exposed through sys.atexit function
mp_obj_t sys_exitfunc;
#endif
// dictionary for the __main__ module
mp_obj_dict_t dict_main;

4
py/runtime.c
View File

@ -118,6 +118,10 @@ void mp_init(void) {
MP_STATE_VM(vfs_mount_table) = NULL;
#endif
#if MICROPY_PY_SYS_ATEXIT
MP_STATE_VM(sys_exitfunc) = mp_const_none;
#endif
#if MICROPY_PY_THREAD_GIL
mp_thread_mutex_init(&MP_STATE_VM(gil_mutex));
#endif