/*
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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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#ifndef __SYS_ARCH_H__
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#define __SYS_ARCH_H__
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/queue.h"
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#include "freertos/semphr.h"
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#include "arch/vfs_lwip.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef xSemaphoreHandle sys_sem_t;
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typedef xSemaphoreHandle sys_mutex_t;
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typedef xTaskHandle sys_thread_t;
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typedef struct sys_mbox_s {
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xQueueHandle os_mbox;
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void *owner;
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}* sys_mbox_t;
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#define LWIP_COMPAT_MUTEX 0
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#if !LWIP_COMPAT_MUTEX
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#define sys_mutex_valid( x ) ( ( ( *x ) == NULL) ? pdFALSE : pdTRUE )
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#define sys_mutex_set_invalid( x ) ( ( *x ) = NULL )
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#endif
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#define sys_mbox_valid( x ) ( ( ( *x ) == NULL) ? pdFALSE : pdTRUE )
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/* Define the sys_mbox_set_invalid() to empty to support lock-free mbox in ESP LWIP.
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*
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* The basic idea about the lock-free mbox is that the mbox should always be valid unless
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* no socket APIs are using the socket and the socket is closed. ESP LWIP achieves this by
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* following two changes to official LWIP:
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* 1. Postpone the deallocation of mbox to netconn_free(), in other words, free the mbox when
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* no one is using the socket.
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* 2. Define the sys_mbox_set_invalid() to empty if the mbox is not actually freed.
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* The second change is necessary. Consider a common scenario: the application task calls
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* recv() to receive packets from the socket, the sys_mbox_valid() returns true. Because there
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* is no lock for the mbox, the LWIP CORE can call sys_mbox_set_invalid() to set the mbox at
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* anytime and the thread-safe issue may happen.
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*
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* However, if the sys_mbox_set_invalid() is not called after sys_mbox_free(), e.g. in netconn_alloc(),
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* we need to initialize the mbox to invalid explicitly since sys_mbox_set_invalid() now is empty.
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*/
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#define sys_mbox_set_invalid( x )
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#define sys_sem_valid( x ) ( ( ( *x ) == NULL) ? pdFALSE : pdTRUE )
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#define sys_sem_set_invalid( x ) ( ( *x ) = NULL )
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void sys_delay_ms(uint32_t ms);
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sys_sem_t* sys_thread_sem_init(void);
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void sys_thread_sem_deinit(void);
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sys_sem_t* sys_thread_sem_get(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __SYS_ARCH_H__ */
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