118 lines
4.2 KiB
C
118 lines
4.2 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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* SPDX-FileCopyrightText: Copyright (c) 2017 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/runtime.h"
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#if MICROPY_ENABLE_SCHEDULER
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// A variant of this is inlined in the VM at the pending exception check
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void mp_handle_pending(void) {
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if (MP_STATE_VM(sched_state) == MP_SCHED_PENDING) {
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mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
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mp_obj_t obj = MP_STATE_VM(mp_pending_exception);
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if (obj != MP_OBJ_NULL) {
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MP_STATE_VM(mp_pending_exception) = MP_OBJ_NULL;
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if (!mp_sched_num_pending()) {
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MP_STATE_VM(sched_state) = MP_SCHED_IDLE;
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}
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MICROPY_END_ATOMIC_SECTION(atomic_state);
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nlr_raise(obj);
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}
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mp_handle_pending_tail(atomic_state);
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}
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}
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// This function should only be called be mp_sched_handle_pending,
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// or by the VM's inlined version of that function.
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void mp_handle_pending_tail(mp_uint_t atomic_state) {
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MP_STATE_VM(sched_state) = MP_SCHED_LOCKED;
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if (MP_STATE_VM(sched_sp) > 0) {
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mp_sched_item_t item = MP_STATE_VM(sched_stack)[--MP_STATE_VM(sched_sp)];
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MICROPY_END_ATOMIC_SECTION(atomic_state);
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mp_call_function_1_protected(item.func, item.arg);
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} else {
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MICROPY_END_ATOMIC_SECTION(atomic_state);
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}
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mp_sched_unlock();
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}
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void mp_sched_lock(void) {
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mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
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if (MP_STATE_VM(sched_state) < 0) {
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--MP_STATE_VM(sched_state);
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} else {
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MP_STATE_VM(sched_state) = MP_SCHED_LOCKED;
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}
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MICROPY_END_ATOMIC_SECTION(atomic_state);
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}
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void mp_sched_unlock(void) {
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mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
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if (++MP_STATE_VM(sched_state) == 0) {
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// vm became unlocked
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if (MP_STATE_VM(mp_pending_exception) != MP_OBJ_NULL || mp_sched_num_pending()) {
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MP_STATE_VM(sched_state) = MP_SCHED_PENDING;
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} else {
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MP_STATE_VM(sched_state) = MP_SCHED_IDLE;
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}
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}
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MICROPY_END_ATOMIC_SECTION(atomic_state);
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}
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bool mp_sched_schedule(mp_obj_t function, mp_obj_t arg) {
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mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
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bool ret;
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if (MP_STATE_VM(sched_sp) < MICROPY_SCHEDULER_DEPTH) {
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if (MP_STATE_VM(sched_state) == MP_SCHED_IDLE) {
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MP_STATE_VM(sched_state) = MP_SCHED_PENDING;
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}
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MP_STATE_VM(sched_stack)[MP_STATE_VM(sched_sp)].func = function;
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MP_STATE_VM(sched_stack)[MP_STATE_VM(sched_sp)].arg = arg;
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++MP_STATE_VM(sched_sp);
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ret = true;
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} else {
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// schedule stack is full
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ret = false;
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}
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MICROPY_END_ATOMIC_SECTION(atomic_state);
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return ret;
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}
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#else // MICROPY_ENABLE_SCHEDULER
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// A variant of this is inlined in the VM at the pending exception check
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void mp_handle_pending(void) {
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if (MP_STATE_VM(mp_pending_exception) != MP_OBJ_NULL) {
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mp_obj_t obj = MP_STATE_VM(mp_pending_exception);
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MP_STATE_VM(mp_pending_exception) = MP_OBJ_NULL;
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nlr_raise(obj);
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}
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}
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#endif // MICROPY_ENABLE_SCHEDULER
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