mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-08-15 00:29:02 +00:00
178 lines
5.4 KiB
C
178 lines
5.4 KiB
C
|
/*
|
||
|
* Copyright (c) 2007, 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: Oliver Schmidt <ol.sc@web.de>
|
||
|
*
|
||
|
* $Id: mtarch.c,v 1.1 2007/04/03 00:40:51 oliverschmidt Exp $
|
||
|
*/
|
||
|
|
||
|
#ifdef __CYGWIN__
|
||
|
|
||
|
#define WIN32_LEAN_AND_MEAN
|
||
|
#include <windows.h>
|
||
|
|
||
|
static void *main_fiber;
|
||
|
|
||
|
#else /* __CYGWIN__ */
|
||
|
|
||
|
#include <stdlib.h>
|
||
|
#include <signal.h>
|
||
|
#include <ucontext.h>
|
||
|
|
||
|
struct mtarch_t {
|
||
|
char stack[4096];
|
||
|
ucontext_t context;
|
||
|
};
|
||
|
|
||
|
static ucontext_t main_context;
|
||
|
static ucontext_t *running_context;
|
||
|
|
||
|
#endif /* __CYGWIN__ */
|
||
|
|
||
|
#include "mtarch.h"
|
||
|
|
||
|
/*--------------------------------------------------------------------------*/
|
||
|
void
|
||
|
mtarch_init(void)
|
||
|
{
|
||
|
#ifdef __CYGWIN__
|
||
|
|
||
|
main_fiber = ConvertThreadToFiber(NULL);
|
||
|
|
||
|
#endif /* __CYGWIN__ */
|
||
|
}
|
||
|
/*--------------------------------------------------------------------------*/
|
||
|
void
|
||
|
mtarch_remove(void)
|
||
|
{
|
||
|
#ifdef __CYGWIN__
|
||
|
|
||
|
ConvertFiberToThread();
|
||
|
|
||
|
#endif /* __CYGWIN__ */
|
||
|
}
|
||
|
/*--------------------------------------------------------------------------*/
|
||
|
void
|
||
|
mtarch_start(struct mtarch_thread *thread,
|
||
|
void (* function)(void *data),
|
||
|
void *data)
|
||
|
{
|
||
|
#ifdef __CYGWIN__
|
||
|
|
||
|
thread->mt_thread = CreateFiber(0, (LPFIBER_START_ROUTINE)function, data);
|
||
|
|
||
|
#else /* __CYGWIN__ */
|
||
|
|
||
|
thread->mt_thread = malloc(sizeof(struct mtarch_t));
|
||
|
|
||
|
getcontext(&((struct mtarch_t *)&thread->mt_thread)->context);
|
||
|
|
||
|
((struct mtarch_t *)&thread->mt_thread)->context.uc_link = NULL;
|
||
|
((struct mtarch_t *)&thread->mt_thread)->context.uc_stack.ss_sp =
|
||
|
((struct mtarch_t *)&thread->mt_thread)->stack;
|
||
|
((struct mtarch_t *)&thread->mt_thread)->context.uc_stack.ss_size =
|
||
|
sizeof(((struct mtarch_t *)&thread->mt_thread)->stack);
|
||
|
|
||
|
/* Some notes:
|
||
|
- If a CPU needs stronger alignment for the stack than malloc()
|
||
|
guarantees (like i.e. IA64) then makecontext() is supposed to
|
||
|
add that alignment internally.
|
||
|
- According to POSIX the arguments to function() are of type int
|
||
|
and there are in fact 64-bit implementations which support only
|
||
|
32 bits per argument meaning that a pointer argument has to be
|
||
|
splitted into two arguments.
|
||
|
- Most implementations interpret context.uc_stack.ss_sp on entry
|
||
|
as the lowest stack address even if the CPU stack actually grows
|
||
|
downwards. Although this means that ss_sp does NOT represent the
|
||
|
CPU stack pointer this behaviour makes perfectly sense as it is
|
||
|
the only way to stay independent from the CPU architecture. But
|
||
|
Solaris prior to release 10 interprets ss_sp as highest stack
|
||
|
address thus requiring special handling. */
|
||
|
makecontext(&((struct mtarch_t *)&thread->mt_thread)->context,
|
||
|
(void (*)(void))function, 1, data);
|
||
|
|
||
|
#endif /* __CYGWIN__ */
|
||
|
}
|
||
|
/*--------------------------------------------------------------------------*/
|
||
|
void
|
||
|
mtarch_yield(void)
|
||
|
{
|
||
|
#ifdef __CYGWIN__
|
||
|
|
||
|
SwitchToFiber(main_fiber);
|
||
|
|
||
|
#else /* __CYGWIN__ */
|
||
|
|
||
|
swapcontext(running_context, &main_context);
|
||
|
|
||
|
#endif /* __CYGWIN__ */
|
||
|
}
|
||
|
/*--------------------------------------------------------------------------*/
|
||
|
void
|
||
|
mtarch_exec(struct mtarch_thread *thread)
|
||
|
{
|
||
|
#ifdef __CYGWIN__
|
||
|
|
||
|
SwitchToFiber(thread->mt_thread);
|
||
|
|
||
|
#else /* __CYGWIN__ */
|
||
|
|
||
|
running_context = &((struct mtarch_t *)&thread->mt_thread)->context;
|
||
|
swapcontext(&main_context, running_context);
|
||
|
running_context = NULL;
|
||
|
|
||
|
#endif /* __CYGWIN__ */
|
||
|
}
|
||
|
/*--------------------------------------------------------------------------*/
|
||
|
void
|
||
|
mtarch_stop(struct mtarch_thread *thread)
|
||
|
{
|
||
|
#ifdef __CYGWIN__
|
||
|
|
||
|
DeleteFiber(thread->mt_thread);
|
||
|
|
||
|
#else /* __CYGWIN__ */
|
||
|
|
||
|
free(thread->mt_thread);
|
||
|
|
||
|
#endif /* __CYGWIN__ */
|
||
|
}
|
||
|
/*--------------------------------------------------------------------------*/
|
||
|
void
|
||
|
mtarch_pstart(void)
|
||
|
{
|
||
|
}
|
||
|
/*--------------------------------------------------------------------------*/
|
||
|
void
|
||
|
mtarch_pstop(void)
|
||
|
{
|
||
|
}
|
||
|
/*--------------------------------------------------------------------------*/
|