osd-contiki/platform/cooja/sys/cooja_mt.h
fros4943 cb71b2fca6 added support for busy-waits in simulated contiki processes
(the entire process_run()-loop is inside a Contiki multi-thread)
2006-09-29 14:32:15 +00:00

253 lines
7.3 KiB
C

/*
* Copyright (c) 2004, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: cooja_mt.h,v 1.1 2006/09/29 14:32:38 fros4943 Exp $
*/
/*
* This file is ripped from mt.h of the Contiki Multi-threading library.
* Fredrik Osterlind <fros@sics.se>
*/
#ifndef __COOJA_MT_H__
#define __COOJA_MT_H__
#include "contiki.h"
/**
* An opaque structure that is used for holding the state of a thread.
*
* The structure should be defined in the "mtarch.h" file. This
* structure typically holds the entire stack for the thread.
*/
struct cooja_mtarch_thread;
/**
* Initialize the architecture specific support functions for the
* multi-thread library.
*
* This function is implemented by the architecture specific functions
* for the multi-thread library and is called by the mt_init()
* function as part of the initialization of the library. The
* mtarch_init() function can be used for, e.g., starting preemtion
* timers or other architecture specific mechanisms required for the
* operation of the library.
*/
void cooja_mtarch_init(void);
/**
* Uninstall library and clean up.
*
*/
void cooja_mtarch_remove(void);
/**
* Setup the stack frame for a thread that is being started.
*
* This function is called by the mt_start() function in order to set
* up the architecture specific stack of the thread to be started.
*
* \param thread A pointer to a struct mtarch_thread for the thread to
* be started.
*
* \param function A pointer to the function that the thread will
* start executing the first time it is scheduled to run.
*
* \param data A pointer to the argument that the function should be
* passed.
*/
void cooja_mtarch_start(struct cooja_mtarch_thread *thread,
void (* function)(void *data),
void *data);
/**
* Yield the processor.
*
* This function is called by the mt_yield() function, which is called
* from the running thread in order to give up the processor.
*
*/
void cooja_mtarch_yield(void);
/**
* Start executing a thread.
*
* This function is called from mt_exec() and the purpose of the
* function is to start execution of the thread. The function should
* switch in the stack of the thread, and does not return until the
* thread has explicitly yielded (using mt_yield()) or until it is
* preempted.
*
*/
void cooja_mtarch_exec(struct cooja_mtarch_thread *thread);
/** @} */
#include "cooja_mtarch.h"
struct cooja_mt_thread {
int state;
process_event_t *evptr;
process_data_t *dataptr;
struct cooja_mtarch_thread thread;
};
/**
* No error.
*
* \hideinitializer
*/
#define MT_OK 1
/**
* Initializes the multithreading library.
*
*/
void cooja_mt_init(void);
/**
* Uninstalls library and cleans up.
*
*/
void cooja_mt_remove(void);
/**
* Starts a multithreading thread.
*
* \param thread Pointer to an mt_thread struct that must have been
* previously allocated by the caller.
*
* \param function A pointer to the entry function of the thread that is
* to be set up.
*
* \param data A pointer that will be passed to the entry function.
*
*/
void cooja_mt_start(struct cooja_mt_thread *thread, void (* function)(void *), void *data);
/**
* Execute parts of a thread.
*
* This function is called by a Contiki process and runs a
* thread. The function does not return until the thread has yielded,
* or is preempted.
*
* \note The thread must first be initialized with the mt_init() function.
*
* \param thread A pointer to a struct mt_thread block that must be
* allocated by the caller.
*
*/
void cooja_mt_exec(struct cooja_mt_thread *thread);
/**
* Post an event to a thread.
*
* This function posts an event to a thread. The thread will be
* scheduled if the thread currently is waiting for the posted event
* number. If the thread is not waiting for the event, this function
* does nothing.
*
* \note The thread must first be initialized with the mt_init() function.
*
* \param thread A pointer to a struct mt_thread block that must be
* allocated by the caller.
*
* \param s The event that is posted to the thread.
*
* \param data An opaque pointer to a user specified structure
* containing additonal information, or NULL if no additional
* information is needed.
*/
/*void mt_exec_event(struct mt_thread *thread, process_event_t s,
process_data_t data);*/
/**
* Voluntarily give up the processor.
*
* This function is called by a running thread in order to give up
* control of the CPU.
*
*/
void cooja_mt_yield(void);
/**
* Post an event to another process.
*
* This function is called by a running thread and will emit a signal
* to another Contiki process. This will cause the currently executing
* thread to yield.
*
* \param p The process receiving the signal, or PROCESS_BROADCAST
* for a broadcast event.
*
* \param ev The event to be posted.
*
* \param data A pointer to a message that is to be delivered together
* with the signal.
*
*/
/*void mt_post(struct process *p, process_event_t ev, process_data_t data);*/
/**
* Block and wait for an event to occur.
*
* This function can be called by a running thread in order to block
* and wait for an event. The function returns when an event has
* occured. The event number and the associated data are placed in the
* variables pointed to by the function arguments.
*
* \param ev A pointer to a process_event_t variable. The variable
* will be filled with the number event that woke the thread.
*
* \param data A pointer to a process_data_t variable. The variable
* will be filled with the data associated with the event that woke
* the thread.
*
*/
/*void mt_wait(process_event_t *ev, process_data_t *data);*/
/**
* Exit a thread.
*
* This function is called from within an executing thread in order to
* exit the thread. The function never returns.
*
*/
void cooja_mt_exit(void);
/** @} */
/** @} */
#endif /* __MT_H__ */