332 lines
12 KiB
C
332 lines
12 KiB
C
/*
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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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*/
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#ifndef __LWIP_SYS_H__
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#define __LWIP_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_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_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_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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#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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/** 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 *mutex);
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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 *mutex);
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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 *mutex);
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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 *mutex);
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#ifndef sys_mutex_valid
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/** Check if a mutex is valid/allocated: return 1 for valid, 0 for invalid */
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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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/** Set a mutex invalid so that sys_mutex_valid returns 0 */
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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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/** Create a new semaphore
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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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err_t sys_sem_new(sys_sem_t *sem, u8_t count);
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/** Signals a semaphore
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* @param sem the semaphore to signal */
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void sys_sem_signal(sys_sem_t *sem);
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/** Wait for a semaphore for the specified timeout
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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 time (in milliseconds) waited for the semaphore
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* or SYS_ARCH_TIMEOUT on timeout */
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u32_t sys_arch_sem_wait(sys_sem_t *sem, u32_t timeout);
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/** Delete a semaphore
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* @param sem semaphore to delete */
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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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/** Check if a sempahore is valid/allocated: return 1 for valid, 0 for invalid */
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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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/** Set a semaphore invalid so that sys_sem_valid returns 0 */
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void sys_sem_set_invalid(sys_sem_t *sem);
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#endif
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/* Time functions. */
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#ifndef sys_msleep
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void sys_msleep(u32_t ms); /* only has a (close to) 1 jiffy resolution. */
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#endif
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/* Mailbox functions. */
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/** Create a new mbox of specified size
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* @param mbox pointer to the mbox to create
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* @param size (miminum) number of messages in this mbox
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* @return ERR_OK if successful, another err_t otherwise */
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err_t sys_mbox_new(sys_mbox_t *mbox, int size);
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/** Post a message to an mbox - may not fail
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* -> blocks if full, only used from tasks not from ISR
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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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void sys_mbox_post(sys_mbox_t *mbox, void *msg);
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/** Try to post a message to an mbox - may fail if full or ISR
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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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err_t sys_mbox_trypost(sys_mbox_t *mbox, void *msg);
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/** Wait for a new message to arrive in the mbox
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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
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* @return time (in milliseconds) waited for a message, may be 0 if not waited
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or SYS_ARCH_TIMEOUT on timeout
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* The returned time has to be accurate to prevent timer jitter! */
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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 timout for sys_arch_mbox_fetch() */
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#ifndef sys_arch_mbox_tryfetch
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/** Wait for a new message to arrive in the mbox
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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
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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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u32_t sys_arch_mbox_tryfetch(sys_mbox_t *mbox, void **msg);
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#endif
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/** For now, we map straight to sys_arch implementation. */
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#define sys_mbox_tryfetch(mbox, msg) sys_arch_mbox_tryfetch(mbox, msg)
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/** Delete an mbox
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* @param mbox mbox to delete */
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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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/** Check if an mbox is valid/allocated: return 1 for valid, 0 for invalid */
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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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/** Set an mbox invalid so that sys_mbox_valid returns 0 */
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void sys_mbox_set_invalid(sys_mbox_t *mbox);
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#endif
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/** The only thread function:
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* Creates a new thread
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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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/* sys_init() must be called before anthing else. */
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void sys_init(void);
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#ifndef sys_jiffies
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/** Ticks/jiffies since power up. */
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u32_t sys_jiffies(void);
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#endif
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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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u32_t sys_now(void);
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/* Critical Region Protection */
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/* 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
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mechanism than using semaphores. Otherwise semaphores can be used for
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implementation */
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#ifndef SYS_ARCH_PROTECT
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/** SYS_LIGHTWEIGHT_PROT
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* define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
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* for certain critical regions during buffer allocation, deallocation and memory
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* allocation and deallocation.
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*/
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#if SYS_LIGHTWEIGHT_PROT
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/** SYS_ARCH_DECL_PROTECT
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* declare a protection variable. This macro will default to defining a variable of
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* type sys_prot_t. If a particular port needs a different implementation, then
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* this macro may be defined in sys_arch.h.
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*/
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#define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev
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/** SYS_ARCH_PROTECT
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* Perform a "fast" protect. This could be implemented by
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* disabling interrupts for an embedded system or by using a semaphore or
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* mutex. The implementation should allow calling SYS_ARCH_PROTECT when
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* already protected. The old protection level is returned in the variable
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* "lev". This macro will default to calling the sys_arch_protect() function
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* which should be implemented in sys_arch.c. If a particular port needs a
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* different implementation, then this macro may be defined in sys_arch.h
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*/
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#define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect()
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/** SYS_ARCH_UNPROTECT
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* Perform a "fast" set of the protection level to "lev". This could be
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* implemented by setting the interrupt level to "lev" within the MACRO or by
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* using a semaphore or mutex. This macro will default to calling the
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* sys_arch_unprotect() function which should be implemented in
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* sys_arch.c. If a particular port needs a different implementation, then
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* this macro may be defined in sys_arch.h
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*/
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#define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev)
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sys_prot_t sys_arch_protect(void);
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void sys_arch_unprotect(sys_prot_t pval);
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#else
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#define SYS_ARCH_DECL_PROTECT(lev)
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#define SYS_ARCH_PROTECT(lev)
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#define SYS_ARCH_UNPROTECT(lev)
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#endif /* SYS_LIGHTWEIGHT_PROT */
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#endif /* SYS_ARCH_PROTECT */
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/*
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* Macros to set/get and increase/decrease variables in a thread-safe way.
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* Use these for accessing variable that are used from more than one thread.
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*/
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#ifndef SYS_ARCH_INC
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#define SYS_ARCH_INC(var, val) do { \
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SYS_ARCH_DECL_PROTECT(old_level); \
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SYS_ARCH_PROTECT(old_level); \
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var += val; \
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SYS_ARCH_UNPROTECT(old_level); \
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} while(0)
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#endif /* SYS_ARCH_INC */
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#ifndef SYS_ARCH_DEC
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#define SYS_ARCH_DEC(var, val) do { \
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SYS_ARCH_DECL_PROTECT(old_level); \
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SYS_ARCH_PROTECT(old_level); \
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var -= val; \
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SYS_ARCH_UNPROTECT(old_level); \
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} while(0)
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#endif /* SYS_ARCH_DEC */
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#ifndef SYS_ARCH_GET
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#define SYS_ARCH_GET(var, ret) do { \
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SYS_ARCH_DECL_PROTECT(old_level); \
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SYS_ARCH_PROTECT(old_level); \
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ret = var; \
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SYS_ARCH_UNPROTECT(old_level); \
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} while(0)
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#endif /* SYS_ARCH_GET */
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#ifndef SYS_ARCH_SET
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#define SYS_ARCH_SET(var, val) do { \
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SYS_ARCH_DECL_PROTECT(old_level); \
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SYS_ARCH_PROTECT(old_level); \
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var = val; \
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SYS_ARCH_UNPROTECT(old_level); \
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} while(0)
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#endif /* SYS_ARCH_SET */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __LWIP_SYS_H__ */
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