CPU agnostic implementation of the platform specific part of the multi-threading library. Uses fibers on Windows and the ucontext functions on other platforms.
This commit is contained in:
oliverschmidt
parent
d7a2317e33
commit
aa4434ca55
3 changed files with 221 additions and 1 deletions
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@ -1,4 +1,4 @@
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CONTIKI_SOURCEFILES += rtimer-arch.c elfloader-stub.c
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CONTIKI_SOURCEFILES += mtarch.c rtimer-arch.c elfloader-stub.c
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### Compiler definitions
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### Compiler definitions
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CC = gcc
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CC = gcc
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177
cpu/native/mtarch.c
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177
cpu/native/mtarch.c
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/*
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* Copyright (c) 2007, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Oliver Schmidt <ol.sc@web.de>
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*
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* $Id: mtarch.c,v 1.1 2007/04/03 00:40:51 oliverschmidt Exp $
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*/
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#ifdef __CYGWIN__
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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static void *main_fiber;
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#else /* __CYGWIN__ */
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#include <stdlib.h>
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#include <signal.h>
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#include <ucontext.h>
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struct mtarch_t {
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char stack[4096];
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ucontext_t context;
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};
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static ucontext_t main_context;
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static ucontext_t *running_context;
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#endif /* __CYGWIN__ */
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#include "mtarch.h"
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/*--------------------------------------------------------------------------*/
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void
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mtarch_init(void)
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{
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#ifdef __CYGWIN__
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main_fiber = ConvertThreadToFiber(NULL);
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#endif /* __CYGWIN__ */
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_remove(void)
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{
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#ifdef __CYGWIN__
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ConvertFiberToThread();
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#endif /* __CYGWIN__ */
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_start(struct mtarch_thread *thread,
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void (* function)(void *data),
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void *data)
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{
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#ifdef __CYGWIN__
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thread->mt_thread = CreateFiber(0, (LPFIBER_START_ROUTINE)function, data);
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#else /* __CYGWIN__ */
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thread->mt_thread = malloc(sizeof(struct mtarch_t));
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getcontext(&((struct mtarch_t *)&thread->mt_thread)->context);
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((struct mtarch_t *)&thread->mt_thread)->context.uc_link = NULL;
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((struct mtarch_t *)&thread->mt_thread)->context.uc_stack.ss_sp =
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((struct mtarch_t *)&thread->mt_thread)->stack;
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((struct mtarch_t *)&thread->mt_thread)->context.uc_stack.ss_size =
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sizeof(((struct mtarch_t *)&thread->mt_thread)->stack);
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/* Some notes:
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- If a CPU needs stronger alignment for the stack than malloc()
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guarantees (like i.e. IA64) then makecontext() is supposed to
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add that alignment internally.
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- According to POSIX the arguments to function() are of type int
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and there are in fact 64-bit implementations which support only
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32 bits per argument meaning that a pointer argument has to be
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splitted into two arguments.
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- Most implementations interpret context.uc_stack.ss_sp on entry
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as the lowest stack address even if the CPU stack actually grows
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downwards. Although this means that ss_sp does NOT represent the
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CPU stack pointer this behaviour makes perfectly sense as it is
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the only way to stay independent from the CPU architecture. But
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Solaris prior to release 10 interprets ss_sp as highest stack
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address thus requiring special handling. */
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makecontext(&((struct mtarch_t *)&thread->mt_thread)->context,
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(void (*)(void))function, 1, data);
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#endif /* __CYGWIN__ */
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_yield(void)
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{
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#ifdef __CYGWIN__
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SwitchToFiber(main_fiber);
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#else /* __CYGWIN__ */
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swapcontext(running_context, &main_context);
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#endif /* __CYGWIN__ */
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_exec(struct mtarch_thread *thread)
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{
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#ifdef __CYGWIN__
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SwitchToFiber(thread->mt_thread);
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#else /* __CYGWIN__ */
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running_context = &((struct mtarch_t *)&thread->mt_thread)->context;
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swapcontext(&main_context, running_context);
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running_context = NULL;
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#endif /* __CYGWIN__ */
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_stop(struct mtarch_thread *thread)
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{
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#ifdef __CYGWIN__
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DeleteFiber(thread->mt_thread);
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#else /* __CYGWIN__ */
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free(thread->mt_thread);
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#endif /* __CYGWIN__ */
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_pstart(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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void
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mtarch_pstop(void)
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{
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}
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/*--------------------------------------------------------------------------*/
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43
cpu/native/mtarch.h
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43
cpu/native/mtarch.h
Normal file
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@ -0,0 +1,43 @@
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/*
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* Copyright (c) 2007, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Oliver Schmidt <ol.sc@web.de>
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*
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* $Id: mtarch.h,v 1.1 2007/04/03 00:40:51 oliverschmidt Exp $
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*/
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#ifndef __MTARCH_H__
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#define __MTARCH_H__
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struct mtarch_thread {
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void *mt_thread;
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};
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#endif /* __MTARCH_H__ */
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