kopia lustrzana https://github.com/micropython/micropython
312 wiersze
12 KiB
C
312 wiersze
12 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include "py/nlr.h"
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#include "py/obj.h"
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#include "py/objlist.h"
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#include "py/mperrno.h"
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#include "py/mphal.h"
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#include "pybioctl.h"
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// Flags for poll()
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#define FLAG_ONESHOT (1)
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/// \module select - Provides select function to wait for events on a stream
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///
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/// This module provides the select function.
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typedef struct _poll_obj_t {
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mp_obj_t obj;
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mp_uint_t (*ioctl)(mp_obj_t obj, mp_uint_t request, mp_uint_t arg, int *errcode);
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mp_uint_t flags;
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mp_uint_t flags_ret;
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} poll_obj_t;
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STATIC void poll_map_add(mp_map_t *poll_map, const mp_obj_t *obj, mp_uint_t obj_len, mp_uint_t flags, bool or_flags) {
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for (mp_uint_t i = 0; i < obj_len; i++) {
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mp_map_elem_t *elem = mp_map_lookup(poll_map, mp_obj_id(obj[i]), MP_MAP_LOOKUP_ADD_IF_NOT_FOUND);
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if (elem->value == NULL) {
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// object not found; get its ioctl and add it to the poll list
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mp_obj_type_t *type = mp_obj_get_type(obj[i]);
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if (type->stream_p == NULL || type->stream_p->ioctl == NULL) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "object with stream.ioctl required"));
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}
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poll_obj_t *poll_obj = m_new_obj(poll_obj_t);
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poll_obj->obj = obj[i];
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poll_obj->ioctl = type->stream_p->ioctl;
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poll_obj->flags = flags;
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poll_obj->flags_ret = 0;
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elem->value = poll_obj;
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} else {
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// object exists; update its flags
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if (or_flags) {
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((poll_obj_t*)elem->value)->flags |= flags;
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} else {
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((poll_obj_t*)elem->value)->flags = flags;
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}
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}
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}
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}
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// poll each object in the map
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STATIC mp_uint_t poll_map_poll(mp_map_t *poll_map, mp_uint_t *rwx_num) {
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mp_uint_t n_ready = 0;
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for (mp_uint_t i = 0; i < poll_map->alloc; ++i) {
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if (!MP_MAP_SLOT_IS_FILLED(poll_map, i)) {
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continue;
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}
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poll_obj_t *poll_obj = (poll_obj_t*)poll_map->table[i].value;
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int errcode;
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mp_int_t ret = poll_obj->ioctl(poll_obj->obj, MP_IOCTL_POLL, poll_obj->flags, &errcode);
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poll_obj->flags_ret = ret;
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if (ret == -1) {
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// error doing ioctl
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nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(errcode)));
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}
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if (ret != 0) {
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// object is ready
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n_ready += 1;
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if (rwx_num != NULL) {
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if (ret & MP_IOCTL_POLL_RD) {
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rwx_num[0] += 1;
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}
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if (ret & MP_IOCTL_POLL_WR) {
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rwx_num[1] += 1;
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}
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if ((ret & ~(MP_IOCTL_POLL_RD | MP_IOCTL_POLL_WR)) != 0) {
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rwx_num[2] += 1;
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}
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}
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}
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}
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return n_ready;
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}
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/// \function select(rlist, wlist, xlist[, timeout])
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STATIC mp_obj_t select_select(uint n_args, const mp_obj_t *args) {
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// get array data from tuple/list arguments
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mp_uint_t rwx_len[3];
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mp_obj_t *r_array, *w_array, *x_array;
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mp_obj_get_array(args[0], &rwx_len[0], &r_array);
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mp_obj_get_array(args[1], &rwx_len[1], &w_array);
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mp_obj_get_array(args[2], &rwx_len[2], &x_array);
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// get timeout
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mp_uint_t timeout = -1;
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if (n_args == 4) {
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if (args[3] != mp_const_none) {
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#if MICROPY_PY_BUILTINS_FLOAT
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float timeout_f = mp_obj_get_float(args[3]);
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if (timeout_f >= 0) {
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timeout = (mp_uint_t)(timeout_f * 1000);
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}
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#else
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timeout = mp_obj_get_int(args[3]) * 1000;
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#endif
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}
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}
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// merge separate lists and get the ioctl function for each object
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mp_map_t poll_map;
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mp_map_init(&poll_map, rwx_len[0] + rwx_len[1] + rwx_len[2]);
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poll_map_add(&poll_map, r_array, rwx_len[0], MP_IOCTL_POLL_RD, true);
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poll_map_add(&poll_map, w_array, rwx_len[1], MP_IOCTL_POLL_WR, true);
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poll_map_add(&poll_map, x_array, rwx_len[2], MP_IOCTL_POLL_ERR | MP_IOCTL_POLL_HUP, true);
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mp_uint_t start_tick = mp_hal_ticks_ms();
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rwx_len[0] = rwx_len[1] = rwx_len[2] = 0;
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for (;;) {
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// poll the objects
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mp_uint_t n_ready = poll_map_poll(&poll_map, rwx_len);
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if (n_ready > 0 || (timeout != -1 && mp_hal_ticks_ms() - start_tick >= timeout)) {
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// one or more objects are ready, or we had a timeout
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mp_obj_t list_array[3];
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list_array[0] = mp_obj_new_list(rwx_len[0], NULL);
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list_array[1] = mp_obj_new_list(rwx_len[1], NULL);
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list_array[2] = mp_obj_new_list(rwx_len[2], NULL);
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rwx_len[0] = rwx_len[1] = rwx_len[2] = 0;
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for (mp_uint_t i = 0; i < poll_map.alloc; ++i) {
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if (!MP_MAP_SLOT_IS_FILLED(&poll_map, i)) {
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continue;
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}
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poll_obj_t *poll_obj = (poll_obj_t*)poll_map.table[i].value;
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if (poll_obj->flags_ret & MP_IOCTL_POLL_RD) {
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((mp_obj_list_t*)list_array[0])->items[rwx_len[0]++] = poll_obj->obj;
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}
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if (poll_obj->flags_ret & MP_IOCTL_POLL_WR) {
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((mp_obj_list_t*)list_array[1])->items[rwx_len[1]++] = poll_obj->obj;
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}
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if ((poll_obj->flags_ret & ~(MP_IOCTL_POLL_RD | MP_IOCTL_POLL_WR)) != 0) {
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((mp_obj_list_t*)list_array[2])->items[rwx_len[2]++] = poll_obj->obj;
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}
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}
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mp_map_deinit(&poll_map);
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return mp_obj_new_tuple(3, list_array);
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}
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__WFI();
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}
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_select_select_obj, 3, 4, select_select);
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/// \class Poll - poll class
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typedef struct _mp_obj_poll_t {
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mp_obj_base_t base;
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mp_map_t poll_map;
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} mp_obj_poll_t;
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/// \method register(obj[, eventmask])
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STATIC mp_obj_t poll_register(uint n_args, const mp_obj_t *args) {
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mp_obj_poll_t *self = args[0];
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mp_uint_t flags;
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if (n_args == 3) {
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flags = mp_obj_get_int(args[2]);
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} else {
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flags = MP_IOCTL_POLL_RD | MP_IOCTL_POLL_WR;
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}
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poll_map_add(&self->poll_map, &args[1], 1, flags, false);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(poll_register_obj, 2, 3, poll_register);
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/// \method unregister(obj)
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STATIC mp_obj_t poll_unregister(mp_obj_t self_in, mp_obj_t obj_in) {
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mp_obj_poll_t *self = self_in;
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mp_map_lookup(&self->poll_map, mp_obj_id(obj_in), MP_MAP_LOOKUP_REMOVE_IF_FOUND);
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// TODO raise KeyError if obj didn't exist in map
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(poll_unregister_obj, poll_unregister);
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/// \method modify(obj, eventmask)
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STATIC mp_obj_t poll_modify(mp_obj_t self_in, mp_obj_t obj_in, mp_obj_t eventmask_in) {
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mp_obj_poll_t *self = self_in;
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mp_map_elem_t *elem = mp_map_lookup(&self->poll_map, mp_obj_id(obj_in), MP_MAP_LOOKUP);
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if (elem == NULL) {
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nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(MP_ENOENT)));
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}
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((poll_obj_t*)elem->value)->flags = mp_obj_get_int(eventmask_in);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_3(poll_modify_obj, poll_modify);
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/// \method poll([timeout])
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/// Timeout is in milliseconds.
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STATIC mp_obj_t poll_poll(uint n_args, const mp_obj_t *args) {
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mp_obj_poll_t *self = args[0];
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// work out timeout (its given already in ms)
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mp_uint_t timeout = -1;
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int flags = 0;
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if (n_args >= 2) {
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if (args[1] != mp_const_none) {
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mp_int_t timeout_i = mp_obj_get_int(args[1]);
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if (timeout_i >= 0) {
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timeout = timeout_i;
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}
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}
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if (n_args >= 3) {
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flags = mp_obj_get_int(args[2]);
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}
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}
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mp_uint_t start_tick = mp_hal_ticks_ms();
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for (;;) {
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// poll the objects
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mp_uint_t n_ready = poll_map_poll(&self->poll_map, NULL);
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if (n_ready > 0 || (timeout != -1 && mp_hal_ticks_ms() - start_tick >= timeout)) {
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// one or more objects are ready, or we had a timeout
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mp_obj_list_t *ret_list = mp_obj_new_list(n_ready, NULL);
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n_ready = 0;
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for (mp_uint_t i = 0; i < self->poll_map.alloc; ++i) {
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if (!MP_MAP_SLOT_IS_FILLED(&self->poll_map, i)) {
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continue;
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}
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poll_obj_t *poll_obj = (poll_obj_t*)self->poll_map.table[i].value;
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if (poll_obj->flags_ret != 0) {
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mp_obj_t tuple[2] = {poll_obj->obj, MP_OBJ_NEW_SMALL_INT(poll_obj->flags_ret)};
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ret_list->items[n_ready++] = mp_obj_new_tuple(2, tuple);
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if (flags & FLAG_ONESHOT) {
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// Don't poll next time, until new event flags will be set explicitly
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poll_obj->flags = 0;
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}
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}
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}
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return ret_list;
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}
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__WFI();
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}
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(poll_poll_obj, 1, 3, poll_poll);
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STATIC const mp_map_elem_t poll_locals_dict_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR_register), (mp_obj_t)&poll_register_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_unregister), (mp_obj_t)&poll_unregister_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_modify), (mp_obj_t)&poll_modify_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_poll), (mp_obj_t)&poll_poll_obj },
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};
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STATIC MP_DEFINE_CONST_DICT(poll_locals_dict, poll_locals_dict_table);
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STATIC const mp_obj_type_t mp_type_poll = {
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{ &mp_type_type },
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.name = MP_QSTR_poll,
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.locals_dict = (mp_obj_t)&poll_locals_dict,
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};
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/// \function poll()
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STATIC mp_obj_t select_poll(void) {
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mp_obj_poll_t *poll = m_new_obj(mp_obj_poll_t);
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poll->base.type = &mp_type_poll;
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mp_map_init(&poll->poll_map, 0);
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return poll;
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}
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MP_DEFINE_CONST_FUN_OBJ_0(mp_select_poll_obj, select_poll);
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STATIC const mp_map_elem_t mp_module_select_globals_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_uselect) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_select), (mp_obj_t)&mp_select_select_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_poll), (mp_obj_t)&mp_select_poll_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_POLLIN), MP_OBJ_NEW_SMALL_INT(MP_IOCTL_POLL_RD) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_POLLOUT), MP_OBJ_NEW_SMALL_INT(MP_IOCTL_POLL_WR) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_POLLERR), MP_OBJ_NEW_SMALL_INT(MP_IOCTL_POLL_ERR) },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_POLLHUP), MP_OBJ_NEW_SMALL_INT(MP_IOCTL_POLL_HUP) },
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};
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STATIC MP_DEFINE_CONST_DICT(mp_module_select_globals, mp_module_select_globals_table);
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const mp_obj_module_t mp_module_uselect = {
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.base = { &mp_type_module },
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.name = MP_QSTR_uselect,
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.globals = (mp_obj_dict_t*)&mp_module_select_globals,
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};
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