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70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/**
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* @file task.h
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* Provides multitasking functionality
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*
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* Copyright (C) 2018 Clyne Sullivan
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef TASK_H_
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#define TASK_H_
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#include <stdint.h>
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/**
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* A structure to contain task data.
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*/
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typedef struct task_t {
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struct task_t *next; /**< pointer to the next task_t instance */
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uint32_t *sp; /**< pointer to the task's last sp register value */
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uint32_t *stack; /**< pointer to the task's stack */
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uint32_t sleep; /**< number of milliseconds task is sleeping for */
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uint32_t pid;
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} task_t;
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/**
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* Enters multitasking mode. The given function acts as the initial thread.
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* This task is given a 4kb stack.
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* @param init the initial thread to run
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*/
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void task_init(void (*init)(void), uint16_t stackSize);
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/**
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* Starts a new task.
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* @param task the code to run
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* @param stackSize how many bytes of stack to give the thread
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*/
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void task_start(void (*task)(void), uint16_t stackSize);
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/**
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* Allows task switching to be disabled, for low-level actions.
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* Multiple holds can be placed, and all must be removed to continue task
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* switching.
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* @param hold non-zero for hold, zero to remove hold
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*/
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void task_hold(uint8_t hold);
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/**
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* Frees the task's resources and removes it from the running task list.
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* @param code An unused exit code
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*/
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void _exit(int code);
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void task_sleep(uint32_t ms);
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uint32_t task_getpid(void);
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#endif // TASK_H_
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