542 lines
18 KiB
C
542 lines
18 KiB
C
/*
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* Copyright (c) 2001-2003 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 modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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//*****************************************************************************
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//
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// Include OS functionality.
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//
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//*****************************************************************************
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/* ------------------------ System architecture includes ----------------------------- */
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#include "arch/sys_arch.h"
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/* ------------------------ lwIP includes --------------------------------- */
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#include "lwip/opt.h"
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#include "lwip/debug.h"
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#include "lwip/def.h"
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#include "lwip/sys.h"
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#include "lwip/mem.h"
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#include "lwip/stats.h"
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/*---------------------------------------------------------------------------*
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* Routine: sys_mbox_new
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*---------------------------------------------------------------------------*
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* Description:
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* Creates a new mailbox
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* Inputs:
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* int size -- Size of elements in the mailbox
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* Outputs:
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* sys_mbox_t -- Handle to new mailbox
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*---------------------------------------------------------------------------*/
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err_t sys_mbox_new( sys_mbox_t *pxMailBox, int iSize )
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{
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err_t xReturn = ERR_MEM;
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*pxMailBox = xQueueCreate( iSize, sizeof( void * ) );
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if( *pxMailBox != NULL )
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{
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xReturn = ERR_OK;
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SYS_STATS_INC_USED( mbox );
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}
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return xReturn;
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_mbox_free
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*---------------------------------------------------------------------------*
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* Description:
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* Deallocates a mailbox. If there are messages still present in the
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* mailbox when the mailbox is deallocated, it is an indication of a
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* programming error in lwIP and the developer should be notified.
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* Inputs:
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* sys_mbox_t mbox -- Handle of mailbox
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* Outputs:
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* sys_mbox_t -- Handle to new mailbox
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*---------------------------------------------------------------------------*/
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void sys_mbox_free( sys_mbox_t *pxMailBox )
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{
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unsigned long ulMessagesWaiting;
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ulMessagesWaiting = uxQueueMessagesWaiting( *pxMailBox );
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configASSERT( ( ulMessagesWaiting == 0 ) );
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#if SYS_STATS
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{
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if( ulMessagesWaiting != 0UL )
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{
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SYS_STATS_INC( mbox.err );
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}
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SYS_STATS_DEC( mbox.used );
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}
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#endif /* SYS_STATS */
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vQueueDelete( *pxMailBox );
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_mbox_post
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*---------------------------------------------------------------------------*
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* Description:
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* Post the "msg" to the mailbox.
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* Inputs:
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* sys_mbox_t mbox -- Handle of mailbox
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* void *data -- Pointer to data to post
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*---------------------------------------------------------------------------*/
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void sys_mbox_post( sys_mbox_t *pxMailBox, void *pxMessageToPost )
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{
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while( xQueueSendToBack( *pxMailBox, &pxMessageToPost, portMAX_DELAY ) != pdTRUE );
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_mbox_trypost
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*---------------------------------------------------------------------------*
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* Description:
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* Try to post the "msg" to the mailbox. Returns immediately with
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* error if cannot.
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* Inputs:
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* sys_mbox_t mbox -- Handle of mailbox
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* void *msg -- Pointer to data to post
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* Outputs:
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* err_t -- ERR_OK if message posted, else ERR_MEM
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* if not.
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*---------------------------------------------------------------------------*/
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err_t sys_mbox_trypost( sys_mbox_t *pxMailBox, void *pxMessageToPost )
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{
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err_t xReturn;
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if( xQueueSend( *pxMailBox, &pxMessageToPost, 0UL ) == pdPASS )
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{
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xReturn = ERR_OK;
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}
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else
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{
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/* The queue was already full. */
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xReturn = ERR_MEM;
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SYS_STATS_INC( mbox.err );
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}
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return xReturn;
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_arch_mbox_fetch
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*---------------------------------------------------------------------------*
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* Description:
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* Blocks the thread until a message arrives in the mailbox, but does
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* not block the thread longer than "timeout" milliseconds (similar to
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* the sys_arch_sem_wait() function). The "msg" argument is a result
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* parameter that is set by the function (i.e., by doing "*msg =
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* ptr"). The "msg" parameter maybe NULL to indicate that the message
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* should be dropped.
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*
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* The return values are the same as for the sys_arch_sem_wait() function:
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* Number of milliseconds spent waiting or SYS_ARCH_TIMEOUT if there was a
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* timeout.
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*
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* Note that a function with a similar name, sys_mbox_fetch(), is
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* implemented by lwIP.
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* Inputs:
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* sys_mbox_t mbox -- Handle of mailbox
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* void **msg -- Pointer to pointer to msg received
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* u32_t timeout -- Number of milliseconds until timeout
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* Outputs:
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* u32_t -- SYS_ARCH_TIMEOUT if timeout, else number
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* of milliseconds until received.
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*---------------------------------------------------------------------------*/
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u32_t sys_arch_mbox_fetch( sys_mbox_t *pxMailBox, void **ppvBuffer, u32_t ulTimeOut )
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{
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void *pvDummy;
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TickType_t xStartTime, xEndTime, xElapsed;
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unsigned long ulReturn;
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xStartTime = xTaskGetTickCount();
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if( NULL == ppvBuffer )
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{
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ppvBuffer = &pvDummy;
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}
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if( ulTimeOut != 0UL )
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{
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if( pdTRUE == xQueueReceive( *pxMailBox, &( *ppvBuffer ), ulTimeOut/ portTICK_PERIOD_MS ) )
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{
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xEndTime = xTaskGetTickCount();
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xElapsed = ( xEndTime - xStartTime ) * portTICK_PERIOD_MS;
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ulReturn = xElapsed;
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}
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else
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{
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/* Timed out. */
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*ppvBuffer = NULL;
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ulReturn = SYS_ARCH_TIMEOUT;
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}
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}
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else
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{
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while( pdTRUE != xQueueReceive( *pxMailBox, &( *ppvBuffer ), portMAX_DELAY ) );
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xEndTime = xTaskGetTickCount();
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xElapsed = ( xEndTime - xStartTime ) * portTICK_PERIOD_MS;
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if( xElapsed == 0UL )
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{
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xElapsed = 1UL;
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}
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ulReturn = xElapsed;
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}
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return ulReturn;
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_arch_mbox_tryfetch
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*---------------------------------------------------------------------------*
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* Description:
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* Similar to sys_arch_mbox_fetch, but if message is not ready
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* immediately, we'll return with SYS_MBOX_EMPTY. On success, 0 is
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* returned.
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* Inputs:
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* sys_mbox_t mbox -- Handle of mailbox
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* void **msg -- Pointer to pointer to msg received
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* Outputs:
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* u32_t -- SYS_MBOX_EMPTY if no messages. Otherwise,
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* return ERR_OK.
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*---------------------------------------------------------------------------*/
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u32_t sys_arch_mbox_tryfetch( sys_mbox_t *pxMailBox, void **ppvBuffer )
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{
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void *pvDummy;
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unsigned long ulReturn;
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if( ppvBuffer== NULL )
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{
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ppvBuffer = &pvDummy;
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}
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if( pdTRUE == xQueueReceive( *pxMailBox, &( *ppvBuffer ), 0UL ) )
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{
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ulReturn = ERR_OK;
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}
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else
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{
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ulReturn = SYS_MBOX_EMPTY;
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}
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return ulReturn;
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_sem_new
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*---------------------------------------------------------------------------*
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* Description:
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* Creates and returns a new semaphore. The "ucCount" argument specifies
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* the initial state of the semaphore.
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* NOTE: Currently this routine only creates counts of 1 or 0
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* Inputs:
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* sys_mbox_t mbox -- Handle of mailbox
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* u8_t ucCount -- Initial ucCount of semaphore (1 or 0)
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* Outputs:
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* sys_sem_t -- Created semaphore or 0 if could not create.
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*---------------------------------------------------------------------------*/
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err_t sys_sem_new( sys_sem_t *pxSemaphore, u8_t ucCount )
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{
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err_t xReturn = ERR_MEM;
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vSemaphoreCreateBinary( ( *pxSemaphore ) );
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if( *pxSemaphore != NULL )
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{
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if( ucCount == 0U )
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{
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xSemaphoreTake( *pxSemaphore, 1UL );
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}
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xReturn = ERR_OK;
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SYS_STATS_INC_USED( sem );
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}
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else
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{
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SYS_STATS_INC( sem.err );
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}
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return xReturn;
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_arch_sem_wait
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*---------------------------------------------------------------------------*
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* Description:
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* Blocks the thread while waiting for the semaphore to be
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* signaled. If the "timeout" argument is non-zero, the thread should
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* only be blocked for the specified time (measured in
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* milliseconds).
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*
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* If the timeout argument is non-zero, the return value is the number of
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* milliseconds spent waiting for the semaphore to be signaled. If the
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* semaphore wasn't signaled within the specified time, the return value is
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* SYS_ARCH_TIMEOUT. If the thread didn't have to wait for the semaphore
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* (i.e., it was already signaled), the function may return zero.
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*
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* Notice that lwIP implements a function with a similar name,
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* sys_sem_wait(), that uses the sys_arch_sem_wait() function.
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* Inputs:
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* sys_sem_t sem -- Semaphore to wait on
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* u32_t timeout -- Number of milliseconds until timeout
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* Outputs:
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* u32_t -- Time elapsed or SYS_ARCH_TIMEOUT.
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*---------------------------------------------------------------------------*/
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u32_t sys_arch_sem_wait( sys_sem_t *pxSemaphore, u32_t ulTimeout )
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{
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TickType_t xStartTime, xEndTime, xElapsed;
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unsigned long ulReturn;
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xStartTime = xTaskGetTickCount();
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if( ulTimeout != 0UL )
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{
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if( xSemaphoreTake( *pxSemaphore, ulTimeout / portTICK_PERIOD_MS ) == pdTRUE )
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{
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xEndTime = xTaskGetTickCount();
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xElapsed = (xEndTime - xStartTime) * portTICK_PERIOD_MS;
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ulReturn = xElapsed;
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}
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else
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{
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ulReturn = SYS_ARCH_TIMEOUT;
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}
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}
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else
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{
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while( xSemaphoreTake( *pxSemaphore, portMAX_DELAY ) != pdTRUE );
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xEndTime = xTaskGetTickCount();
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xElapsed = ( xEndTime - xStartTime ) * portTICK_PERIOD_MS;
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if( xElapsed == 0UL )
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{
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xElapsed = 1UL;
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}
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ulReturn = xElapsed;
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}
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return ulReturn;
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}
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/** Create a new mutex
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* @param mutex pointer to the mutex to create
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* @return a new mutex */
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err_t sys_mutex_new( sys_mutex_t *pxMutex )
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{
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err_t xReturn = ERR_MEM;
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*pxMutex = xSemaphoreCreateMutex();
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if( *pxMutex != NULL )
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{
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xReturn = ERR_OK;
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SYS_STATS_INC_USED( mutex );
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}
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else
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{
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SYS_STATS_INC( mutex.err );
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}
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return xReturn;
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}
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/** Lock a mutex
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* @param mutex the mutex to lock */
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void sys_mutex_lock( sys_mutex_t *pxMutex )
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{
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while( xSemaphoreTake( *pxMutex, portMAX_DELAY ) != pdPASS );
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}
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/** Unlock a mutex
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* @param mutex the mutex to unlock */
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void sys_mutex_unlock(sys_mutex_t *pxMutex )
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{
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xSemaphoreGive( *pxMutex );
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}
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/** Delete a semaphore
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* @param mutex the mutex to delete */
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void sys_mutex_free( sys_mutex_t *pxMutex )
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{
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SYS_STATS_DEC( mutex.used );
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vQueueDelete( *pxMutex );
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_sem_signal
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*---------------------------------------------------------------------------*
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* Description:
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* Signals (releases) a semaphore
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* Inputs:
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* sys_sem_t sem -- Semaphore to signal
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*---------------------------------------------------------------------------*/
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void sys_sem_signal( sys_sem_t *pxSemaphore )
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{
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xSemaphoreGive( *pxSemaphore );
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_sem_free
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*---------------------------------------------------------------------------*
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* Description:
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* Deallocates a semaphore
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* Inputs:
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* sys_sem_t sem -- Semaphore to free
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*---------------------------------------------------------------------------*/
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void sys_sem_free( sys_sem_t *pxSemaphore )
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{
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SYS_STATS_DEC(sem.used);
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vQueueDelete( *pxSemaphore );
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_init
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*---------------------------------------------------------------------------*
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* Description:
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* Initialize sys arch
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*---------------------------------------------------------------------------*/
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void sys_init(void)
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{
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}
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u32_t sys_now(void)
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{
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return xTaskGetTickCount();
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_thread_new
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*---------------------------------------------------------------------------*
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* Description:
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* Starts a new thread with priority "prio" that will begin its
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* execution in the function "thread()". The "arg" argument will be
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* passed as an argument to the thread() function. The id of the new
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* thread is returned. Both the id and the priority are system
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* dependent.
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* Inputs:
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* char *name -- Name of thread
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* void (* thread)(void *arg) -- Pointer to function to run.
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* void *arg -- Argument passed into function
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* int stacksize -- Required stack amount in bytes
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* int prio -- Thread priority
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* Outputs:
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* sys_thread_t -- Pointer to per-thread timeouts.
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*---------------------------------------------------------------------------*/
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sys_thread_t sys_thread_new( const char *pcName, void( *pxThread )( void *pvParameters ), void *pvArg, int iStackSize, int iPriority )
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{
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TaskHandle_t xCreatedTask;
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portBASE_TYPE xResult;
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sys_thread_t xReturn;
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xResult = xTaskCreate( pxThread, pcName, iStackSize, pvArg, iPriority, &xCreatedTask );
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if( xResult == pdPASS )
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{
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xReturn = xCreatedTask;
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}
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else
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{
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xReturn = NULL;
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}
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return xReturn;
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_arch_protect
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*---------------------------------------------------------------------------*
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* Description:
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* This optional function does a "fast" critical region protection and
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* returns the previous protection level. This function is only called
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* during very short critical regions. An embedded system which supports
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* ISR-based drivers might want to implement this function by disabling
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* interrupts. Task-based systems might want to implement this by using
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* a mutex or disabling tasking. This function should support recursive
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* calls from the same task or interrupt. In other words,
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* sys_arch_protect() could be called while already protected. In
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* that case the return value indicates that it is already protected.
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*
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* sys_arch_protect() is only required if your port is supporting an
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* operating system.
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* Outputs:
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* sys_prot_t -- Previous protection level (not used here)
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*---------------------------------------------------------------------------*/
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sys_prot_t sys_arch_protect( void )
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{
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vPortEnterCritical();
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return ( sys_prot_t ) 1;
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}
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/*---------------------------------------------------------------------------*
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* Routine: sys_arch_unprotect
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*---------------------------------------------------------------------------*
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* Description:
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* This optional function does a "fast" set of critical region
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* protection to the value specified by pval. See the documentation for
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* sys_arch_protect() for more information. This function is only
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* required if your port is supporting an operating system.
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* Inputs:
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* sys_prot_t -- Previous protection level (not used here)
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*---------------------------------------------------------------------------*/
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void sys_arch_unprotect( sys_prot_t xValue )
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{
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(void) xValue;
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taskEXIT_CRITICAL();
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}
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/*
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* Prints an assertion messages and aborts execution.
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*/
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void sys_assert( const char *pcMessage )
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{
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(void) pcMessage;
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for (;;)
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{
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}
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}
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/*-------------------------------------------------------------------------*
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* End of File: sys_arch.c
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*-------------------------------------------------------------------------*/
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