124 lines
3.7 KiB
C
124 lines
3.7 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) 2016 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/mpconfig.h"
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#include "py/mpstate.h"
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#include "py/gc.h"
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#include "py/mpthread.h"
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#include "gccollect.h"
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#if MICROPY_PY_THREAD
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// the mutex controls access to the linked list
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STATIC mp_thread_mutex_t thread_mutex;
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void mp_thread_init(void) {
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mp_thread_mutex_init(&thread_mutex);
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mp_thread_set_state(&mp_state_ctx.thread);
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}
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void mp_thread_gc_others(void) {
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mp_thread_mutex_lock(&thread_mutex, 1);
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gc_collect_root((void**)&pyb_thread_cur, 1);
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for (pyb_thread_t *th = pyb_thread_cur;; th = th->next) {
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gc_collect_root(&th->arg, 1);
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if (th != pyb_thread_cur) {
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gc_collect_root(th->stack, th->stack_len);
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}
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if (th->next == pyb_thread_cur) {
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break;
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}
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}
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mp_thread_mutex_unlock(&thread_mutex);
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}
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void mp_thread_create(void *(*entry)(void*), void *arg, size_t *stack_size) {
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if (*stack_size == 0) {
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*stack_size = 4096; // default stack size
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} else if (*stack_size < 2048) {
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*stack_size = 2048; // minimum stack size
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}
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// round stack size to a multiple of the word size
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size_t stack_len = *stack_size / sizeof(uint32_t);
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*stack_size = stack_len * sizeof(uint32_t);
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// allocate stack and linked-list node (must be done outside thread_mutex lock)
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uint32_t *stack = m_new(uint32_t, stack_len);
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pyb_thread_t *th = m_new_obj(pyb_thread_t);
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mp_thread_mutex_lock(&thread_mutex, 1);
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// create thread
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uint32_t id = pyb_thread_new(th, stack, stack_len, entry, arg);
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if (id == 0) {
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mp_thread_mutex_unlock(&thread_mutex);
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "can't create thread"));
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}
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mp_thread_mutex_unlock(&thread_mutex);
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// adjust stack_size to provide room to recover from hitting the limit
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*stack_size -= 1024;
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}
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void mp_thread_start(void) {
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}
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void mp_thread_finish(void) {
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}
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void mp_thread_mutex_init(mp_thread_mutex_t *mutex) {
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*mutex = 0;
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}
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int mp_thread_mutex_lock(mp_thread_mutex_t *mutex, int wait) {
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uint32_t irq_state = disable_irq();
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if (*mutex) {
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// mutex is locked
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if (!wait) {
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enable_irq(irq_state);
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return 0; // failed to lock mutex
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}
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while (*mutex) {
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enable_irq(irq_state);
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pyb_thread_yield();
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irq_state = disable_irq();
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}
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}
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*mutex = 1;
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enable_irq(irq_state);
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return 1; // have mutex
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}
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void mp_thread_mutex_unlock(mp_thread_mutex_t *mutex) {
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*mutex = 0;
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}
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#endif // MICROPY_PY_THREAD
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