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362 lines
13 KiB
362 lines
13 KiB
/* |
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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_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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/** 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 semaphore 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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#ifndef sys_sem_valid_val |
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/** Same as sys_sem_valid() but taking a value, not a pointer */ |
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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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/** Same as sys_sem_set_invalid() but taking a value, not a pointer */ |
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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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/* 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 ms 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 (minimum) 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 (0 = wait forever) |
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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 timeout 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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* @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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#ifndef sys_mbox_valid_val |
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/** Same as sys_mbox_valid() but taking a value, not a pointer */ |
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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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/** Same as sys_mbox_set_invalid() but taking a value, not a pointer */ |
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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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/** The only thread function: |
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* Creates a new thread |
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* ATTENTION: although this function returns a value, it MUST NOT FAIL (ports have to assert this!) |
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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 anything 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_HDR_SYS_H */
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