mirror of
https://github.com/esp8266/Arduino.git
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a1e59e9c01
* update to lwIP-2.1.0rc1: partial SACK support fix #4176 * hash fix * get some flash back due to mistake in conf (fragmentation & reassembly was incorrectly enabled) (ahah I scared you) * add missing include files * update to lwip-2.1.0(release) + remove unused lwIP's include files * lwIP release 2.1.0, SACK is now default, bigger, no-SACK is selectable * fix ldscript * pio * rename 'sack' option to 'feat'ure option, + IP fragmentation/reassembly * merge, fix pio * change internal/hidden string * pio: more lwip2 configuration: + without sack for no change in flash footprint
561 lines
20 KiB
C
561 lines
20 KiB
C
/**
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* @file
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* OS abstraction layer
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*/
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/*
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* Copyright (c) 2001-2004 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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#ifndef LWIP_HDR_SYS_H
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#define LWIP_HDR_SYS_H
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#include "lwip/opt.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if NO_SYS
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/* For a totally minimal and standalone system, we provide null
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definitions of the sys_ functions. */
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typedef u8_t sys_sem_t;
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typedef u8_t sys_mutex_t;
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typedef u8_t sys_mbox_t;
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#define sys_sem_new(s, c) ERR_OK
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#define sys_sem_signal(s)
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#define sys_sem_wait(s)
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#define sys_arch_sem_wait(s,t)
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#define sys_sem_free(s)
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#define sys_sem_valid(s) 0
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#define sys_sem_valid_val(s) 0
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#define sys_sem_set_invalid(s)
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#define sys_sem_set_invalid_val(s)
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#define sys_mutex_new(mu) ERR_OK
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#define sys_mutex_lock(mu)
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#define sys_mutex_unlock(mu)
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#define sys_mutex_free(mu)
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#define sys_mutex_valid(mu) 0
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#define sys_mutex_set_invalid(mu)
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#define sys_mbox_new(m, s) ERR_OK
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#define sys_mbox_fetch(m,d)
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#define sys_mbox_tryfetch(m,d)
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#define sys_mbox_post(m,d)
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#define sys_mbox_trypost(m,d)
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#define sys_mbox_free(m)
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#define sys_mbox_valid(m)
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#define sys_mbox_valid_val(m)
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#define sys_mbox_set_invalid(m)
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#define sys_mbox_set_invalid_val(m)
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#define sys_thread_new(n,t,a,s,p)
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#define sys_msleep(t)
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#else /* NO_SYS */
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/** Return code for timeouts from sys_arch_mbox_fetch and sys_arch_sem_wait */
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#define SYS_ARCH_TIMEOUT 0xffffffffUL
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/** sys_mbox_tryfetch() returns SYS_MBOX_EMPTY if appropriate.
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* For now we use the same magic value, but we allow this to change in future.
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*/
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#define SYS_MBOX_EMPTY SYS_ARCH_TIMEOUT
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#include "lwip/err.h"
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#include "arch/sys_arch.h"
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/** Function prototype for thread functions */
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typedef void (*lwip_thread_fn)(void *arg);
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/* Function prototypes for functions to be implemented by platform ports
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(in sys_arch.c) */
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/* Mutex functions: */
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/** Define LWIP_COMPAT_MUTEX if the port has no mutexes and binary semaphores
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should be used instead */
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#ifndef LWIP_COMPAT_MUTEX
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#define LWIP_COMPAT_MUTEX 0
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#endif
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#if LWIP_COMPAT_MUTEX
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/* for old ports that don't have mutexes: define them to binary semaphores */
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#define sys_mutex_t sys_sem_t
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#define sys_mutex_new(mutex) sys_sem_new(mutex, 1)
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#define sys_mutex_lock(mutex) sys_sem_wait(mutex)
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#define sys_mutex_unlock(mutex) sys_sem_signal(mutex)
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#define sys_mutex_free(mutex) sys_sem_free(mutex)
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#define sys_mutex_valid(mutex) sys_sem_valid(mutex)
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#define sys_mutex_set_invalid(mutex) sys_sem_set_invalid(mutex)
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#else /* LWIP_COMPAT_MUTEX */
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/**
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* @ingroup sys_mutex
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* Create a new mutex.
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* Note that mutexes are expected to not be taken recursively by the lwIP code,
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* so both implementation types (recursive or non-recursive) should work.
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* The mutex is allocated to the memory that 'mutex'
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* points to (which can be both a pointer or the actual OS structure).
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* If the mutex has been created, ERR_OK should be returned. Returning any
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* other error will provide a hint what went wrong, but except for assertions,
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* no real error handling is implemented.
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*
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* @param mutex pointer to the mutex to create
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* @return ERR_OK if successful, another err_t otherwise
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*/
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err_t sys_mutex_new(sys_mutex_t *mutex);
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/**
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* @ingroup sys_mutex
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* Blocks the thread until the mutex can be grabbed.
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* @param mutex the mutex to lock
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*/
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void sys_mutex_lock(sys_mutex_t *mutex);
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/**
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* @ingroup sys_mutex
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* Releases the mutex previously locked through 'sys_mutex_lock()'.
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* @param mutex the mutex to unlock
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*/
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void sys_mutex_unlock(sys_mutex_t *mutex);
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/**
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* @ingroup sys_mutex
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* Deallocates a mutex.
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* @param mutex the mutex to delete
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*/
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void sys_mutex_free(sys_mutex_t *mutex);
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#ifndef sys_mutex_valid
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/**
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* @ingroup sys_mutex
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* Returns 1 if the mutes is valid, 0 if it is not valid.
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* When using pointers, a simple way is to check the pointer for != NULL.
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* When directly using OS structures, implementing this may be more complex.
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* This may also be a define, in which case the function is not prototyped.
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*/
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int sys_mutex_valid(sys_mutex_t *mutex);
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#endif
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#ifndef sys_mutex_set_invalid
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/**
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* @ingroup sys_mutex
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* Invalidate a mutex so that sys_mutex_valid() returns 0.
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* ATTENTION: This does NOT mean that the mutex shall be deallocated:
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* sys_mutex_free() is always called before calling this function!
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* This may also be a define, in which case the function is not prototyped.
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*/
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void sys_mutex_set_invalid(sys_mutex_t *mutex);
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#endif
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#endif /* LWIP_COMPAT_MUTEX */
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/* Semaphore functions: */
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/**
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* @ingroup sys_sem
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* Create a new semaphore
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* Creates a new semaphore. The semaphore is allocated to the memory that 'sem'
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* points to (which can be both a pointer or the actual OS structure).
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* The "count" argument specifies the initial state of the semaphore (which is
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* either 0 or 1).
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* If the semaphore has been created, ERR_OK should be returned. Returning any
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* other error will provide a hint what went wrong, but except for assertions,
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* no real error handling is implemented.
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*
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* @param sem pointer to the semaphore to create
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* @param count initial count of the semaphore
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* @return ERR_OK if successful, another err_t otherwise
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*/
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err_t sys_sem_new(sys_sem_t *sem, u8_t count);
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/**
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* @ingroup sys_sem
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* Signals a semaphore
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* @param sem the semaphore to signal
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*/
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void sys_sem_signal(sys_sem_t *sem);
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/**
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* @ingroup sys_sem
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* Blocks the thread while waiting for the semaphore to be signaled. If the
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* "timeout" argument is non-zero, the thread should only be blocked for the
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* specified time (measured in milliseconds). If the "timeout" argument is zero,
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* the thread should be blocked until the semaphore is signalled.
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*
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* The return value is SYS_ARCH_TIMEOUT if the semaphore wasn't signaled within
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* the specified time or any other value if it was signaled (with or without
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* waiting).
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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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*
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* @param sem the semaphore to wait for
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* @param timeout timeout in milliseconds to wait (0 = wait forever)
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* @return SYS_ARCH_TIMEOUT on timeout, any other value on success
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*/
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u32_t sys_arch_sem_wait(sys_sem_t *sem, u32_t timeout);
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/**
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* @ingroup sys_sem
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* Deallocates a semaphore.
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* @param sem semaphore to delete
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*/
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void sys_sem_free(sys_sem_t *sem);
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/** Wait for a semaphore - forever/no timeout */
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#define sys_sem_wait(sem) sys_arch_sem_wait(sem, 0)
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#ifndef sys_sem_valid
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/**
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* @ingroup sys_sem
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* Returns 1 if the semaphore is valid, 0 if it is not valid.
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* When using pointers, a simple way is to check the pointer for != NULL.
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* When directly using OS structures, implementing this may be more complex.
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* This may also be a define, in which case the function is not prototyped.
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*/
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int sys_sem_valid(sys_sem_t *sem);
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#endif
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#ifndef sys_sem_set_invalid
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/**
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* @ingroup sys_sem
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* Invalidate a semaphore so that sys_sem_valid() returns 0.
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* ATTENTION: This does NOT mean that the semaphore shall be deallocated:
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* sys_sem_free() is always called before calling this function!
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* This may also be a define, in which case the function is not prototyped.
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*/
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void sys_sem_set_invalid(sys_sem_t *sem);
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#endif
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#ifndef sys_sem_valid_val
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/**
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* Same as sys_sem_valid() but taking a value, not a pointer
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*/
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#define sys_sem_valid_val(sem) sys_sem_valid(&(sem))
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#endif
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#ifndef sys_sem_set_invalid_val
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/**
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* Same as sys_sem_set_invalid() but taking a value, not a pointer
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*/
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#define sys_sem_set_invalid_val(sem) sys_sem_set_invalid(&(sem))
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#endif
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#ifndef sys_msleep
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/**
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* @ingroup sys_misc
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* Sleep for specified number of ms
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*/
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void sys_msleep(u32_t ms); /* only has a (close to) 1 ms resolution. */
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#endif
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/* Mailbox functions. */
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/**
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* @ingroup sys_mbox
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* Creates an empty mailbox for maximum "size" elements. Elements stored
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* in mailboxes are pointers. You have to define macros "_MBOX_SIZE"
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* in your lwipopts.h, or ignore this parameter in your implementation
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* and use a default size.
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* If the mailbox has been created, ERR_OK should be returned. Returning any
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* other error will provide a hint what went wrong, but except for assertions,
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* no real error handling is implemented.
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*
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* @param mbox pointer to the mbox to create
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* @param size (minimum) number of messages in this mbox
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* @return ERR_OK if successful, another err_t otherwise
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*/
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err_t sys_mbox_new(sys_mbox_t *mbox, int size);
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/**
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* @ingroup sys_mbox
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* Post a message to an mbox - may not fail
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* -> blocks if full, only to be used from tasks NOT from ISR!
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*
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* @param mbox mbox to posts the message
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* @param msg message to post (ATTENTION: can be NULL)
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*/
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void sys_mbox_post(sys_mbox_t *mbox, void *msg);
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/**
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* @ingroup sys_mbox
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* Try to post a message to an mbox - may fail if full.
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* Can be used from ISR (if the sys arch layer allows this).
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* Returns ERR_MEM if it is full, else, ERR_OK if the "msg" is posted.
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*
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* @param mbox mbox to posts the message
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* @param msg message to post (ATTENTION: can be NULL)
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*/
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err_t sys_mbox_trypost(sys_mbox_t *mbox, void *msg);
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/**
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* @ingroup sys_mbox
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* Try to post a message to an mbox - may fail if full.
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* To be be used from ISR.
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* Returns ERR_MEM if it is full, else, ERR_OK if the "msg" is posted.
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*
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* @param mbox mbox to posts the message
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* @param msg message to post (ATTENTION: can be NULL)
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*/
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err_t sys_mbox_trypost_fromisr(sys_mbox_t *mbox, void *msg);
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/**
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* @ingroup sys_mbox
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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). If "timeout" is 0, the thread should
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* be blocked until a message arrives. 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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* The return values are the same as for the sys_arch_sem_wait() function:
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* SYS_ARCH_TIMEOUT if there was a timeout, any other value if a messages
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* is received.
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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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*
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* @param mbox mbox to get a message from
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* @param msg pointer where the message is stored
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* @param timeout maximum time (in milliseconds) to wait for a message (0 = wait forever)
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* @return SYS_ARCH_TIMEOUT on timeout, any other value if a message has been received
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*/
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u32_t sys_arch_mbox_fetch(sys_mbox_t *mbox, void **msg, u32_t timeout);
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/* Allow port to override with a macro, e.g. special timeout for sys_arch_mbox_fetch() */
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#ifndef sys_arch_mbox_tryfetch
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/**
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* @ingroup sys_mbox
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* This is similar to sys_arch_mbox_fetch, however if a message is not
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* present in the mailbox, it immediately returns with the code
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* SYS_MBOX_EMPTY. On success 0 is returned.
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* To allow for efficient implementations, this can be defined as a
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* function-like macro in sys_arch.h instead of a normal function. For
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* example, a naive implementation could be:
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* \#define sys_arch_mbox_tryfetch(mbox,msg) sys_arch_mbox_fetch(mbox,msg,1)
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* although this would introduce unnecessary delays.
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*
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* @param mbox mbox to get a message from
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* @param msg pointer where the message is stored
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* @return 0 (milliseconds) if a message has been received
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* or SYS_MBOX_EMPTY if the mailbox is empty
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*/
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u32_t sys_arch_mbox_tryfetch(sys_mbox_t *mbox, void **msg);
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#endif
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/**
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* For now, we map straight to sys_arch implementation.
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*/
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#define sys_mbox_tryfetch(mbox, msg) sys_arch_mbox_tryfetch(mbox, msg)
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/**
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* @ingroup sys_mbox
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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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*
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* @param mbox mbox to delete
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*/
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void sys_mbox_free(sys_mbox_t *mbox);
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#define sys_mbox_fetch(mbox, msg) sys_arch_mbox_fetch(mbox, msg, 0)
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#ifndef sys_mbox_valid
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/**
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* @ingroup sys_mbox
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* Returns 1 if the mailbox is valid, 0 if it is not valid.
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* When using pointers, a simple way is to check the pointer for != NULL.
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* When directly using OS structures, implementing this may be more complex.
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* This may also be a define, in which case the function is not prototyped.
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*/
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int sys_mbox_valid(sys_mbox_t *mbox);
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#endif
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#ifndef sys_mbox_set_invalid
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/**
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* @ingroup sys_mbox
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* Invalidate a mailbox so that sys_mbox_valid() returns 0.
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* ATTENTION: This does NOT mean that the mailbox shall be deallocated:
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* sys_mbox_free() is always called before calling this function!
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* This may also be a define, in which case the function is not prototyped.
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*/
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void sys_mbox_set_invalid(sys_mbox_t *mbox);
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#endif
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#ifndef sys_mbox_valid_val
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/**
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* Same as sys_mbox_valid() but taking a value, not a pointer
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*/
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#define sys_mbox_valid_val(mbox) sys_mbox_valid(&(mbox))
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#endif
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#ifndef sys_mbox_set_invalid_val
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/**
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* Same as sys_mbox_set_invalid() but taking a value, not a pointer
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*/
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#define sys_mbox_set_invalid_val(mbox) sys_mbox_set_invalid(&(mbox))
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#endif
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/**
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* @ingroup sys_misc
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* The only thread function:
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* Starts a new thread named "name" with priority "prio" that will begin its
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* execution in the function "thread()". The "arg" argument will be passed as an
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* argument to the thread() function. The stack size to used for this thread is
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* the "stacksize" parameter. The id of the new thread is returned. Both the id
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* and the priority are system dependent.
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* ATTENTION: although this function returns a value, it MUST NOT FAIL (ports have to assert this!)
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*
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* @param name human-readable name for the thread (used for debugging purposes)
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* @param thread thread-function
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* @param arg parameter passed to 'thread'
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* @param stacksize stack size in bytes for the new thread (may be ignored by ports)
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* @param prio priority of the new thread (may be ignored by ports) */
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sys_thread_t sys_thread_new(const char *name, lwip_thread_fn thread, void *arg, int stacksize, int prio);
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#endif /* NO_SYS */
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/**
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* @ingroup sys_misc
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* sys_init() must be called before anything else.
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* Initialize the sys_arch layer.
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*/
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void sys_init(void);
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#ifndef sys_jiffies
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/**
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* Ticks/jiffies since power up.
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*/
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u32_t sys_jiffies(void);
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#endif
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/**
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* @ingroup sys_time
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* Returns the current time in milliseconds,
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* may be the same as sys_jiffies or at least based on it.
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* Don't care for wraparound, this is only used for time diffs.
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* Not implementing this function means you cannot use some modules (e.g. TCP
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* timestamps, internal timeouts for NO_SYS==1).
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|
*/
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|
u32_t sys_now(void);
|
|
|
|
/* Critical Region Protection */
|
|
/* These functions must be implemented in the sys_arch.c file.
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|
In some implementations they can provide a more light-weight protection
|
|
mechanism than using semaphores. Otherwise semaphores can be used for
|
|
implementation */
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|
#ifndef SYS_ARCH_PROTECT
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|
/** SYS_LIGHTWEIGHT_PROT
|
|
* define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
|
|
* for certain critical regions during buffer allocation, deallocation and memory
|
|
* allocation and deallocation.
|
|
*/
|
|
#if SYS_LIGHTWEIGHT_PROT
|
|
|
|
/**
|
|
* @ingroup sys_prot
|
|
* SYS_ARCH_DECL_PROTECT
|
|
* declare a protection variable. This macro will default to defining a variable of
|
|
* type sys_prot_t. If a particular port needs a different implementation, then
|
|
* this macro may be defined in sys_arch.h.
|
|
*/
|
|
#define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev
|
|
/**
|
|
* @ingroup sys_prot
|
|
* SYS_ARCH_PROTECT
|
|
* Perform a "fast" protect. This could be implemented by
|
|
* disabling interrupts for an embedded system or by using a semaphore or
|
|
* mutex. The implementation should allow calling SYS_ARCH_PROTECT when
|
|
* already protected. The old protection level is returned in the variable
|
|
* "lev". This macro will default to calling the sys_arch_protect() function
|
|
* which should be implemented in sys_arch.c. If a particular port needs a
|
|
* different implementation, then this macro may be defined in sys_arch.h
|
|
*/
|
|
#define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect()
|
|
/**
|
|
* @ingroup sys_prot
|
|
* SYS_ARCH_UNPROTECT
|
|
* Perform a "fast" set of the protection level to "lev". This could be
|
|
* implemented by setting the interrupt level to "lev" within the MACRO or by
|
|
* using a semaphore or mutex. This macro will default to calling the
|
|
* sys_arch_unprotect() function which should be implemented in
|
|
* sys_arch.c. If a particular port needs a different implementation, then
|
|
* this macro may be defined in sys_arch.h
|
|
*/
|
|
#define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev)
|
|
sys_prot_t sys_arch_protect(void);
|
|
void sys_arch_unprotect(sys_prot_t pval);
|
|
|
|
#else
|
|
|
|
#define SYS_ARCH_DECL_PROTECT(lev)
|
|
#define SYS_ARCH_PROTECT(lev)
|
|
#define SYS_ARCH_UNPROTECT(lev)
|
|
|
|
#endif /* SYS_LIGHTWEIGHT_PROT */
|
|
|
|
#endif /* SYS_ARCH_PROTECT */
|
|
|
|
/*
|
|
* Macros to set/get and increase/decrease variables in a thread-safe way.
|
|
* Use these for accessing variable that are used from more than one thread.
|
|
*/
|
|
|
|
#ifndef SYS_ARCH_INC
|
|
#define SYS_ARCH_INC(var, val) do { \
|
|
SYS_ARCH_DECL_PROTECT(old_level); \
|
|
SYS_ARCH_PROTECT(old_level); \
|
|
var += val; \
|
|
SYS_ARCH_UNPROTECT(old_level); \
|
|
} while(0)
|
|
#endif /* SYS_ARCH_INC */
|
|
|
|
#ifndef SYS_ARCH_DEC
|
|
#define SYS_ARCH_DEC(var, val) do { \
|
|
SYS_ARCH_DECL_PROTECT(old_level); \
|
|
SYS_ARCH_PROTECT(old_level); \
|
|
var -= val; \
|
|
SYS_ARCH_UNPROTECT(old_level); \
|
|
} while(0)
|
|
#endif /* SYS_ARCH_DEC */
|
|
|
|
#ifndef SYS_ARCH_GET
|
|
#define SYS_ARCH_GET(var, ret) do { \
|
|
SYS_ARCH_DECL_PROTECT(old_level); \
|
|
SYS_ARCH_PROTECT(old_level); \
|
|
ret = var; \
|
|
SYS_ARCH_UNPROTECT(old_level); \
|
|
} while(0)
|
|
#endif /* SYS_ARCH_GET */
|
|
|
|
#ifndef SYS_ARCH_SET
|
|
#define SYS_ARCH_SET(var, val) do { \
|
|
SYS_ARCH_DECL_PROTECT(old_level); \
|
|
SYS_ARCH_PROTECT(old_level); \
|
|
var = val; \
|
|
SYS_ARCH_UNPROTECT(old_level); \
|
|
} while(0)
|
|
#endif /* SYS_ARCH_SET */
|
|
|
|
#ifndef SYS_ARCH_LOCKED
|
|
#define SYS_ARCH_LOCKED(code) do { \
|
|
SYS_ARCH_DECL_PROTECT(old_level); \
|
|
SYS_ARCH_PROTECT(old_level); \
|
|
code; \
|
|
SYS_ARCH_UNPROTECT(old_level); \
|
|
} while(0)
|
|
#endif /* SYS_ARCH_LOCKED */
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* LWIP_HDR_SYS_H */
|