arduino-esp32/tools/sdk/include/lwip/sys_arch.h

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/*
* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
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* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 lwIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
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*
*/
#ifndef __SYS_ARCH_H__
#define __SYS_ARCH_H__
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#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/semphr.h"
#include "arch/vfs_lwip.h"
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#ifdef __cplusplus
extern "C" {
#endif
typedef xSemaphoreHandle sys_sem_t;
typedef xSemaphoreHandle sys_mutex_t;
typedef xTaskHandle sys_thread_t;
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typedef struct sys_mbox_s {
xQueueHandle os_mbox;
void *owner;
}* sys_mbox_t;
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#define LWIP_COMPAT_MUTEX 0
#if !LWIP_COMPAT_MUTEX
#define sys_mutex_valid( x ) ( ( ( *x ) == NULL) ? pdFALSE : pdTRUE )
#define sys_mutex_set_invalid( x ) ( ( *x ) = NULL )
#endif
#define sys_mbox_valid( x ) ( ( ( *x ) == NULL) ? pdFALSE : pdTRUE )
/* Define the sys_mbox_set_invalid() to empty to support lock-free mbox in ESP LWIP.
*
* The basic idea about the lock-free mbox is that the mbox should always be valid unless
* no socket APIs are using the socket and the socket is closed. ESP LWIP achieves this by
* following two changes to official LWIP:
* 1. Postpone the deallocation of mbox to netconn_free(), in other words, free the mbox when
* no one is using the socket.
* 2. Define the sys_mbox_set_invalid() to empty if the mbox is not actually freed.
* The second change is necessary. Consider a common scenario: the application task calls
* recv() to receive packets from the socket, the sys_mbox_valid() returns true. Because there
* is no lock for the mbox, the LWIP CORE can call sys_mbox_set_invalid() to set the mbox at
* anytime and the thread-safe issue may happen.
*
* However, if the sys_mbox_set_invalid() is not called after sys_mbox_free(), e.g. in netconn_alloc(),
* we need to initialize the mbox to invalid explicitly since sys_mbox_set_invalid() now is empty.
*/
#define sys_mbox_set_invalid( x )
#define sys_sem_valid( x ) ( ( ( *x ) == NULL) ? pdFALSE : pdTRUE )
#define sys_sem_set_invalid( x ) ( ( *x ) = NULL )
void sys_delay_ms(uint32_t ms);
sys_sem_t* sys_thread_sem_init(void);
void sys_thread_sem_deinit(void);
sys_sem_t* sys_thread_sem_get(void);
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#ifdef __cplusplus
}
#endif
#endif /* __SYS_ARCH_H__ */