108 lines
3.4 KiB
C
108 lines
3.4 KiB
C
/*
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* This file is part of the MicroPython 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) 2020 Jeff Epler for Adafruit Industries
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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 "py/mpconfig.h"
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#include "supervisor/background_callback.h"
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#include "supervisor/shared/tick.h"
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#include "shared-bindings/microcontroller/__init__.h"
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STATIC volatile background_callback_t *callback_head, *callback_tail;
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#define CALLBACK_CRITICAL_BEGIN (common_hal_mcu_disable_interrupts())
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#define CALLBACK_CRITICAL_END (common_hal_mcu_enable_interrupts())
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void background_callback_add_core(background_callback_t *cb) {
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CALLBACK_CRITICAL_BEGIN;
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if (cb->prev || callback_head == cb) {
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CALLBACK_CRITICAL_END;
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return;
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}
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cb->next = 0;
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cb->prev = (background_callback_t*)callback_tail;
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if (callback_tail) {
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callback_tail->next = cb;
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cb->prev = (background_callback_t*)callback_tail;
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}
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if (!callback_head) {
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callback_head = cb;
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}
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callback_tail = cb;
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CALLBACK_CRITICAL_END;
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}
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void background_callback_add(background_callback_t *cb, background_callback_fun fun, void *data) {
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cb->fun = fun;
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cb->data = data;
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background_callback_add_core(cb);
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}
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static bool in_background_callback;
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void background_callback_run_all() {
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if (!callback_head) {
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return;
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}
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CALLBACK_CRITICAL_BEGIN;
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if (in_background_callback) {
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CALLBACK_CRITICAL_END;
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return;
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}
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in_background_callback = true;
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background_callback_t *cb = (background_callback_t*)callback_head;
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callback_head = NULL;
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callback_tail = NULL;
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while (cb) {
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background_callback_t *next = cb->next;
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cb->next = cb->prev = NULL;
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background_callback_fun fun = cb->fun;
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void *data = cb->data;
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CALLBACK_CRITICAL_END;
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// Leave the critical section in order to run the callback function
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if (fun) {
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fun(data);
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}
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CALLBACK_CRITICAL_BEGIN;
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cb = next;
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}
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in_background_callback = false;
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CALLBACK_CRITICAL_END;
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}
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void background_callback_begin_critical_section() {
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CALLBACK_CRITICAL_BEGIN;
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}
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void background_callback_end_critical_section() {
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CALLBACK_CRITICAL_END;
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}
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void background_callback_reset() {
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CALLBACK_CRITICAL_BEGIN;
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callback_head = NULL;
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callback_tail = NULL;
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in_background_callback = false;
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CALLBACK_CRITICAL_END;
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}
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