msched.h

MANTIS是由科罗拉多大学开发的传感器网络嵌入式操作系统。 这是mantis的0.9.5版本的源码。

//  This file is part of MANTIS OS, Operating System
//  See http://mantis.cs.colorado.edu/
//
//  Copyright (C) 2003,2004,2005 University of Colorado, Boulder
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the mos license (see file LICENSE)

/** @file linux/include/msched.h
 * @brief Implementation of MOS scheduler function on top of pthreads
 * @author Jeff Rose
 * @date 10/24/2002
 * This is a scheduler written for the atmega128 mcu, but it is easily
 * portable to a new platform with a little assembly knowledge.
 */

#ifndef SCHED_H_
#define SCHED_H_

#include <inttypes.h>
#include <pthread.h>

#define MAX_THREADS 15

#define NUM_PRIORITIES 4 // Total number of possible priorities
#define PRIORITY_IDLE (NUM_PRIORITIES - 1)
#define PRIORITY_NORMAL (NUM_PRIORITIES - 2)
#define PRIORITY_HIGH (NUM_PRIORITIES - 3)
#define PRIORITY_KERNEL 0

/* Possible thread states. */
#define EMPTY      0
#define RUNNING    1
#define READY      2
#define BLOCKED    3

/* return codes */
#define THREAD_OK       0
#define NO_MORE_THREADS 1

typedef struct thread_s {
   pthread_t pt;
   pthread_cond_t blocker; //used to suspend/resume thread
   pthread_mutex_t blockerMux; //protects blocker
   void (*func)(void);
   uint8_t state;
   uint8_t priority;
   struct thread_s *next;
} thread_t;

void sched_init(void);
void mos_sched_start(void);
void mos_sched_time_slice(uint8_t slice);
void mos_thread_sleep (uint32_t sleep_time);

uint8_t mos_disable_ints(void);
void mos_enable_ints(uint8_t int_handle);

uint8_t mos_thread_new(void (*function_start)(void),
		       uint16_t stack_size,
		       uint8_t priority);
#define mos_thread_new_havestack(func,size,stack,priority) mos_thread_new(func,size,priority)
void mos_thread_suspend(void);
void mos_thread_suspend_noints(uint8_t int_handle);
void mos_thread_resume(thread_t *thread);
void mos_thread_resume_noints(thread_t *thread, uint8_t int_handle);
thread_t *mos_thread_current(void);
void mos_thread_exit(void);

#endif