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LPC2368/lwip/include/lwip/sys.h@0:0f6c82fcde82, 2010-12-09 (annotated)

Committer:: mamezu
Date:: Thu Dec 09 01:33:56 2010 +0000
Revision:: 0:0f6c82fcde82

Who changed what in which revision?

User	Revision	Line number	New contents of line
mamezu	0:0f6c82fcde82	1	/*
mamezu	0:0f6c82fcde82	2	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mamezu	0:0f6c82fcde82	3	* All rights reserved.
mamezu	0:0f6c82fcde82	4	*
mamezu	0:0f6c82fcde82	5	* Redistribution and use in source and binary forms, with or without modification,
mamezu	0:0f6c82fcde82	6	* are permitted provided that the following conditions are met:
mamezu	0:0f6c82fcde82	7	*
mamezu	0:0f6c82fcde82	8	* 1. Redistributions of source code must retain the above copyright notice,
mamezu	0:0f6c82fcde82	9	* this list of conditions and the following disclaimer.
mamezu	0:0f6c82fcde82	10	* 2. Redistributions in binary form must reproduce the above copyright notice,
mamezu	0:0f6c82fcde82	11	* this list of conditions and the following disclaimer in the documentation
mamezu	0:0f6c82fcde82	12	* and/or other materials provided with the distribution.
mamezu	0:0f6c82fcde82	13	* 3. The name of the author may not be used to endorse or promote products
mamezu	0:0f6c82fcde82	14	* derived from this software without specific prior written permission.
mamezu	0:0f6c82fcde82	15	*
mamezu	0:0f6c82fcde82	16	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mamezu	0:0f6c82fcde82	17	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mamezu	0:0f6c82fcde82	18	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mamezu	0:0f6c82fcde82	19	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mamezu	0:0f6c82fcde82	20	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mamezu	0:0f6c82fcde82	21	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mamezu	0:0f6c82fcde82	22	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mamezu	0:0f6c82fcde82	23	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mamezu	0:0f6c82fcde82	24	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mamezu	0:0f6c82fcde82	25	* OF SUCH DAMAGE.
mamezu	0:0f6c82fcde82	26	*
mamezu	0:0f6c82fcde82	27	* This file is part of the lwIP TCP/IP stack.
mamezu	0:0f6c82fcde82	28	*
mamezu	0:0f6c82fcde82	29	* Author: Adam Dunkels <adam@sics.se>
mamezu	0:0f6c82fcde82	30	*
mamezu	0:0f6c82fcde82	31	*/
mamezu	0:0f6c82fcde82	32	#ifndef __LWIP_SYS_H__
mamezu	0:0f6c82fcde82	33	#define __LWIP_SYS_H__
mamezu	0:0f6c82fcde82	34
mamezu	0:0f6c82fcde82	35	#include "lwip/opt.h"
mamezu	0:0f6c82fcde82	36
mamezu	0:0f6c82fcde82	37	#ifdef __cplusplus
mamezu	0:0f6c82fcde82	38	extern "C" {
mamezu	0:0f6c82fcde82	39	#endif
mamezu	0:0f6c82fcde82	40
mamezu	0:0f6c82fcde82	41	#if NO_SYS
mamezu	0:0f6c82fcde82	42
mamezu	0:0f6c82fcde82	43	/* For a totally minimal and standalone system, we provide null
mamezu	0:0f6c82fcde82	44	definitions of the sys_ functions. */
mamezu	0:0f6c82fcde82	45	typedef u8_t sys_sem_t;
mamezu	0:0f6c82fcde82	46	typedef u8_t sys_mutex_t;
mamezu	0:0f6c82fcde82	47	typedef u8_t sys_mbox_t;
mamezu	0:0f6c82fcde82	48
mamezu	0:0f6c82fcde82	49	#define sys_sem_new(s, c) ERR_OK
mamezu	0:0f6c82fcde82	50	#define sys_sem_signal(s)
mamezu	0:0f6c82fcde82	51	#define sys_sem_wait(s)
mamezu	0:0f6c82fcde82	52	#define sys_arch_sem_wait(s,t)
mamezu	0:0f6c82fcde82	53	#define sys_sem_free(s)
mamezu	0:0f6c82fcde82	54	#define sys_mutex_new(mu) ERR_OK
mamezu	0:0f6c82fcde82	55	#define sys_mutex_lock(mu)
mamezu	0:0f6c82fcde82	56	#define sys_mutex_unlock(mu)
mamezu	0:0f6c82fcde82	57	#define sys_mutex_free(mu)
mamezu	0:0f6c82fcde82	58	#define sys_mbox_new(m, s) ERR_OK
mamezu	0:0f6c82fcde82	59	#define sys_mbox_fetch(m,d)
mamezu	0:0f6c82fcde82	60	#define sys_mbox_tryfetch(m,d)
mamezu	0:0f6c82fcde82	61	#define sys_mbox_post(m,d)
mamezu	0:0f6c82fcde82	62	#define sys_mbox_trypost(m,d)
mamezu	0:0f6c82fcde82	63	#define sys_mbox_free(m)
mamezu	0:0f6c82fcde82	64
mamezu	0:0f6c82fcde82	65	#define sys_thread_new(n,t,a,s,p)
mamezu	0:0f6c82fcde82	66
mamezu	0:0f6c82fcde82	67	#define sys_msleep(t)
mamezu	0:0f6c82fcde82	68
mamezu	0:0f6c82fcde82	69	#else /* NO_SYS */
mamezu	0:0f6c82fcde82	70
mamezu	0:0f6c82fcde82	71	/** Return code for timeouts from sys_arch_mbox_fetch and sys_arch_sem_wait */
mamezu	0:0f6c82fcde82	72	#define SYS_ARCH_TIMEOUT 0xffffffffUL
mamezu	0:0f6c82fcde82	73
mamezu	0:0f6c82fcde82	74	/** sys_mbox_tryfetch() returns SYS_MBOX_EMPTY if appropriate.
mamezu	0:0f6c82fcde82	75	* For now we use the same magic value, but we allow this to change in future.
mamezu	0:0f6c82fcde82	76	*/
mamezu	0:0f6c82fcde82	77	#define SYS_MBOX_EMPTY SYS_ARCH_TIMEOUT
mamezu	0:0f6c82fcde82	78
mamezu	0:0f6c82fcde82	79	#include "lwip/err.h"
mamezu	0:0f6c82fcde82	80	#include "arch/sys_arch.h"
mamezu	0:0f6c82fcde82	81
mamezu	0:0f6c82fcde82	82	/** Function prototype for thread functions */
mamezu	0:0f6c82fcde82	83	typedef void (lwip_thread_fn)(void arg);
mamezu	0:0f6c82fcde82	84
mamezu	0:0f6c82fcde82	85	/* Function prototypes for functions to be implemented by platform ports
mamezu	0:0f6c82fcde82	86	(in sys_arch.c) */
mamezu	0:0f6c82fcde82	87
mamezu	0:0f6c82fcde82	88	/* Mutex functions: */
mamezu	0:0f6c82fcde82	89
mamezu	0:0f6c82fcde82	90	/** Define LWIP_COMPAT_MUTEX if the port has no mutexes and binary semaphores
mamezu	0:0f6c82fcde82	91	should be used instead */
mamezu	0:0f6c82fcde82	92	#if LWIP_COMPAT_MUTEX
mamezu	0:0f6c82fcde82	93	/* for old ports that don't have mutexes: define them to binary semaphores */
mamezu	0:0f6c82fcde82	94	#define sys_mutex_t sys_sem_t
mamezu	0:0f6c82fcde82	95	#define sys_mutex_new(mutex) sys_sem_new(mutex, 1)
mamezu	0:0f6c82fcde82	96	#define sys_mutex_lock(mutex) sys_sem_wait(mutex)
mamezu	0:0f6c82fcde82	97	#define sys_mutex_unlock(mutex) sys_sem_signal(mutex)
mamezu	0:0f6c82fcde82	98	#define sys_mutex_free(mutex) sys_sem_free(mutex)
mamezu	0:0f6c82fcde82	99	#define sys_mutex_valid(mutex) sys_sem_valid(mutex)
mamezu	0:0f6c82fcde82	100	#define sys_mutex_set_invalid(mutex) sys_sem_set_invalid(mutex)
mamezu	0:0f6c82fcde82	101
mamezu	0:0f6c82fcde82	102	#else /* LWIP_COMPAT_MUTEX */
mamezu	0:0f6c82fcde82	103
mamezu	0:0f6c82fcde82	104	/** Create a new mutex
mamezu	0:0f6c82fcde82	105	* @param mutex pointer to the mutex to create
mamezu	0:0f6c82fcde82	106	* @return a new mutex */
mamezu	0:0f6c82fcde82	107	err_t sys_mutex_new(sys_mutex_t *mutex);
mamezu	0:0f6c82fcde82	108	/** Lock a mutex
mamezu	0:0f6c82fcde82	109	* @param mutex the mutex to lock */
mamezu	0:0f6c82fcde82	110	void sys_mutex_lock(sys_mutex_t *mutex);
mamezu	0:0f6c82fcde82	111	/** Unlock a mutex
mamezu	0:0f6c82fcde82	112	* @param mutex the mutex to unlock */
mamezu	0:0f6c82fcde82	113	void sys_mutex_unlock(sys_mutex_t *mutex);
mamezu	0:0f6c82fcde82	114	/** Delete a semaphore
mamezu	0:0f6c82fcde82	115	* @param mutex the mutex to delete */
mamezu	0:0f6c82fcde82	116	void sys_mutex_free(sys_mutex_t *mutex);
mamezu	0:0f6c82fcde82	117	#ifndef sys_mutex_valid
mamezu	0:0f6c82fcde82	118	/** Check if a mutex is valid/allocated: return 1 for valid, 0 for invalid */
mamezu	0:0f6c82fcde82	119	int sys_mutex_valid(sys_mutex_t *mutex);
mamezu	0:0f6c82fcde82	120	#endif
mamezu	0:0f6c82fcde82	121	#ifndef sys_mutex_set_invalid
mamezu	0:0f6c82fcde82	122	/** Set a mutex invalid so that sys_mutex_valid returns 0 */
mamezu	0:0f6c82fcde82	123	void sys_mutex_set_invalid(sys_mutex_t *mutex);
mamezu	0:0f6c82fcde82	124	#endif
mamezu	0:0f6c82fcde82	125	#endif /* LWIP_COMPAT_MUTEX */
mamezu	0:0f6c82fcde82	126
mamezu	0:0f6c82fcde82	127	/* Semaphore functions: */
mamezu	0:0f6c82fcde82	128
mamezu	0:0f6c82fcde82	129	/** Create a new semaphore
mamezu	0:0f6c82fcde82	130	* @param sem pointer to the semaphore to create
mamezu	0:0f6c82fcde82	131	* @param count initial count of the semaphore
mamezu	0:0f6c82fcde82	132	* @return ERR_OK if successful, another err_t otherwise */
mamezu	0:0f6c82fcde82	133	err_t sys_sem_new(sys_sem_t *sem, u8_t count);
mamezu	0:0f6c82fcde82	134	/** Signals a semaphore
mamezu	0:0f6c82fcde82	135	* @param sem the semaphore to signal */
mamezu	0:0f6c82fcde82	136	void sys_sem_signal(sys_sem_t *sem);
mamezu	0:0f6c82fcde82	137	/** Wait for a semaphore for the specified timeout
mamezu	0:0f6c82fcde82	138	* @param sem the semaphore to wait for
mamezu	0:0f6c82fcde82	139	* @param timeout timeout in milliseconds to wait (0 = wait forever)
mamezu	0:0f6c82fcde82	140	* @return time (in milliseconds) waited for the semaphore
mamezu	0:0f6c82fcde82	141	* or SYS_ARCH_TIMEOUT on timeout */
mamezu	0:0f6c82fcde82	142	u32_t sys_arch_sem_wait(sys_sem_t *sem, u32_t timeout);
mamezu	0:0f6c82fcde82	143	/** Delete a semaphore
mamezu	0:0f6c82fcde82	144	* @param sem semaphore to delete */
mamezu	0:0f6c82fcde82	145	void sys_sem_free(sys_sem_t *sem);
mamezu	0:0f6c82fcde82	146	/** Wait for a semaphore - forever/no timeout */
mamezu	0:0f6c82fcde82	147	#define sys_sem_wait(sem) sys_arch_sem_wait(sem, 0)
mamezu	0:0f6c82fcde82	148	#ifndef sys_sem_valid
mamezu	0:0f6c82fcde82	149	/** Check if a sempahore is valid/allocated: return 1 for valid, 0 for invalid */
mamezu	0:0f6c82fcde82	150	int sys_sem_valid(sys_sem_t *sem);
mamezu	0:0f6c82fcde82	151	#endif
mamezu	0:0f6c82fcde82	152	#ifndef sys_sem_set_invalid
mamezu	0:0f6c82fcde82	153	/** Set a semaphore invalid so that sys_sem_valid returns 0 */
mamezu	0:0f6c82fcde82	154	void sys_sem_set_invalid(sys_sem_t *sem);
mamezu	0:0f6c82fcde82	155	#endif
mamezu	0:0f6c82fcde82	156
mamezu	0:0f6c82fcde82	157	/* Time functions. */
mamezu	0:0f6c82fcde82	158	#ifndef sys_msleep
mamezu	0:0f6c82fcde82	159	void sys_msleep(u32_t ms); /* only has a (close to) 1 jiffy resolution. */
mamezu	0:0f6c82fcde82	160	#endif
mamezu	0:0f6c82fcde82	161
mamezu	0:0f6c82fcde82	162	/* Mailbox functions. */
mamezu	0:0f6c82fcde82	163
mamezu	0:0f6c82fcde82	164	/** Create a new mbox of specified size
mamezu	0:0f6c82fcde82	165	* @param mbox pointer to the mbox to create
mamezu	0:0f6c82fcde82	166	* @param size (miminum) number of messages in this mbox
mamezu	0:0f6c82fcde82	167	* @return ERR_OK if successful, another err_t otherwise */
mamezu	0:0f6c82fcde82	168	err_t sys_mbox_new(sys_mbox_t *mbox, int size);
mamezu	0:0f6c82fcde82	169	/** Post a message to an mbox - may not fail
mamezu	0:0f6c82fcde82	170	* -> blocks if full, only used from tasks not from ISR
mamezu	0:0f6c82fcde82	171	* @param mbox mbox to posts the message
mamezu	0:0f6c82fcde82	172	* @param msg message to post (ATTENTION: can be NULL) */
mamezu	0:0f6c82fcde82	173	void sys_mbox_post(sys_mbox_t mbox, void msg);
mamezu	0:0f6c82fcde82	174	/** Try to post a message to an mbox - may fail if full or ISR
mamezu	0:0f6c82fcde82	175	* @param mbox mbox to posts the message
mamezu	0:0f6c82fcde82	176	* @param msg message to post (ATTENTION: can be NULL) */
mamezu	0:0f6c82fcde82	177	err_t sys_mbox_trypost(sys_mbox_t mbox, void msg);
mamezu	0:0f6c82fcde82	178	/** Wait for a new message to arrive in the mbox
mamezu	0:0f6c82fcde82	179	* @param mbox mbox to get a message from
mamezu	0:0f6c82fcde82	180	* @param msg pointer where the message is stored
mamezu	0:0f6c82fcde82	181	* @param timeout maximum time (in milliseconds) to wait for a message
mamezu	0:0f6c82fcde82	182	* @return time (in milliseconds) waited for a message, may be 0 if not waited
mamezu	0:0f6c82fcde82	183	or SYS_ARCH_TIMEOUT on timeout
mamezu	0:0f6c82fcde82	184	* The returned time has to be accurate to prevent timer jitter! */
mamezu	0:0f6c82fcde82	185	u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void *msg, u32_t timeout);
mamezu	0:0f6c82fcde82	186	/* Allow port to override with a macro, e.g. special timout for sys_arch_mbox_fetch() */
mamezu	0:0f6c82fcde82	187	#ifndef sys_arch_mbox_tryfetch
mamezu	0:0f6c82fcde82	188	/** Wait for a new message to arrive in the mbox
mamezu	0:0f6c82fcde82	189	* @param mbox mbox to get a message from
mamezu	0:0f6c82fcde82	190	* @param msg pointer where the message is stored
mamezu	0:0f6c82fcde82	191	* @param timeout maximum time (in milliseconds) to wait for a message
mamezu	0:0f6c82fcde82	192	* @return 0 (milliseconds) if a message has been received
mamezu	0:0f6c82fcde82	193	* or SYS_MBOX_EMPTY if the mailbox is empty */
mamezu	0:0f6c82fcde82	194	u32_t sys_arch_mbox_tryfetch(sys_mbox_t mbox, void *msg);
mamezu	0:0f6c82fcde82	195	#endif
mamezu	0:0f6c82fcde82	196	/** For now, we map straight to sys_arch implementation. */
mamezu	0:0f6c82fcde82	197	#define sys_mbox_tryfetch(mbox, msg) sys_arch_mbox_tryfetch(mbox, msg)
mamezu	0:0f6c82fcde82	198	/** Delete an mbox
mamezu	0:0f6c82fcde82	199	* @param mbox mbox to delete */
mamezu	0:0f6c82fcde82	200	void sys_mbox_free(sys_mbox_t *mbox);
mamezu	0:0f6c82fcde82	201	#define sys_mbox_fetch(mbox, msg) sys_arch_mbox_fetch(mbox, msg, 0)
mamezu	0:0f6c82fcde82	202	#ifndef sys_mbox_valid
mamezu	0:0f6c82fcde82	203	/** Check if an mbox is valid/allocated: return 1 for valid, 0 for invalid */
mamezu	0:0f6c82fcde82	204	int sys_mbox_valid(sys_mbox_t *mbox);
mamezu	0:0f6c82fcde82	205	#endif
mamezu	0:0f6c82fcde82	206	#ifndef sys_mbox_set_invalid
mamezu	0:0f6c82fcde82	207	/** Set an mbox invalid so that sys_mbox_valid returns 0 */
mamezu	0:0f6c82fcde82	208	void sys_mbox_set_invalid(sys_mbox_t *mbox);
mamezu	0:0f6c82fcde82	209	#endif
mamezu	0:0f6c82fcde82	210
mamezu	0:0f6c82fcde82	211	/** The only thread function:
mamezu	0:0f6c82fcde82	212	* Creates a new thread
mamezu	0:0f6c82fcde82	213	* @param name human-readable name for the thread (used for debugging purposes)
mamezu	0:0f6c82fcde82	214	* @param thread thread-function
mamezu	0:0f6c82fcde82	215	* @param arg parameter passed to 'thread'
mamezu	0:0f6c82fcde82	216	* @param stacksize stack size in bytes for the new thread (may be ignored by ports)
mamezu	0:0f6c82fcde82	217	* @param prio priority of the new thread (may be ignored by ports) */
mamezu	0:0f6c82fcde82	218	sys_thread_t sys_thread_new(const char name, lwip_thread_fn thread, void arg, int stacksize, int prio);
mamezu	0:0f6c82fcde82	219
mamezu	0:0f6c82fcde82	220	#endif /* NO_SYS */
mamezu	0:0f6c82fcde82	221
mamezu	0:0f6c82fcde82	222	/* sys_init() must be called before anthing else. */
mamezu	0:0f6c82fcde82	223	void sys_init(void);
mamezu	0:0f6c82fcde82	224
mamezu	0:0f6c82fcde82	225	#ifndef sys_jiffies
mamezu	0:0f6c82fcde82	226	/** Ticks/jiffies since power up. */
mamezu	0:0f6c82fcde82	227	u32_t sys_jiffies(void);
mamezu	0:0f6c82fcde82	228	#endif
mamezu	0:0f6c82fcde82	229
mamezu	0:0f6c82fcde82	230	/** Returns the current time in milliseconds,
mamezu	0:0f6c82fcde82	231	* may be the same as sys_jiffies or at least based on it. */
mamezu	0:0f6c82fcde82	232	u32_t sys_now(void);
mamezu	0:0f6c82fcde82	233
mamezu	0:0f6c82fcde82	234	/* Critical Region Protection */
mamezu	0:0f6c82fcde82	235	/* These functions must be implemented in the sys_arch.c file.
mamezu	0:0f6c82fcde82	236	In some implementations they can provide a more light-weight protection
mamezu	0:0f6c82fcde82	237	mechanism than using semaphores. Otherwise semaphores can be used for
mamezu	0:0f6c82fcde82	238	implementation */
mamezu	0:0f6c82fcde82	239	#ifndef SYS_ARCH_PROTECT
mamezu	0:0f6c82fcde82	240	/** SYS_LIGHTWEIGHT_PROT
mamezu	0:0f6c82fcde82	241	* define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
mamezu	0:0f6c82fcde82	242	* for certain critical regions during buffer allocation, deallocation and memory
mamezu	0:0f6c82fcde82	243	* allocation and deallocation.
mamezu	0:0f6c82fcde82	244	*/
mamezu	0:0f6c82fcde82	245	#if SYS_LIGHTWEIGHT_PROT
mamezu	0:0f6c82fcde82	246
mamezu	0:0f6c82fcde82	247	/** SYS_ARCH_DECL_PROTECT
mamezu	0:0f6c82fcde82	248	* declare a protection variable. This macro will default to defining a variable of
mamezu	0:0f6c82fcde82	249	* type sys_prot_t. If a particular port needs a different implementation, then
mamezu	0:0f6c82fcde82	250	* this macro may be defined in sys_arch.h.
mamezu	0:0f6c82fcde82	251	*/
mamezu	0:0f6c82fcde82	252	#define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev
mamezu	0:0f6c82fcde82	253	/** SYS_ARCH_PROTECT
mamezu	0:0f6c82fcde82	254	* Perform a "fast" protect. This could be implemented by
mamezu	0:0f6c82fcde82	255	* disabling interrupts for an embedded system or by using a semaphore or
mamezu	0:0f6c82fcde82	256	* mutex. The implementation should allow calling SYS_ARCH_PROTECT when
mamezu	0:0f6c82fcde82	257	* already protected. The old protection level is returned in the variable
mamezu	0:0f6c82fcde82	258	* "lev". This macro will default to calling the sys_arch_protect() function
mamezu	0:0f6c82fcde82	259	* which should be implemented in sys_arch.c. If a particular port needs a
mamezu	0:0f6c82fcde82	260	* different implementation, then this macro may be defined in sys_arch.h
mamezu	0:0f6c82fcde82	261	*/
mamezu	0:0f6c82fcde82	262	#define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect()
mamezu	0:0f6c82fcde82	263	/** SYS_ARCH_UNPROTECT
mamezu	0:0f6c82fcde82	264	* Perform a "fast" set of the protection level to "lev". This could be
mamezu	0:0f6c82fcde82	265	* implemented by setting the interrupt level to "lev" within the MACRO or by
mamezu	0:0f6c82fcde82	266	* using a semaphore or mutex. This macro will default to calling the
mamezu	0:0f6c82fcde82	267	* sys_arch_unprotect() function which should be implemented in
mamezu	0:0f6c82fcde82	268	* sys_arch.c. If a particular port needs a different implementation, then
mamezu	0:0f6c82fcde82	269	* this macro may be defined in sys_arch.h
mamezu	0:0f6c82fcde82	270	*/
mamezu	0:0f6c82fcde82	271	#define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev)
mamezu	0:0f6c82fcde82	272	sys_prot_t sys_arch_protect(void);
mamezu	0:0f6c82fcde82	273	void sys_arch_unprotect(sys_prot_t pval);
mamezu	0:0f6c82fcde82	274
mamezu	0:0f6c82fcde82	275	#else
mamezu	0:0f6c82fcde82	276
mamezu	0:0f6c82fcde82	277	#define SYS_ARCH_DECL_PROTECT(lev)
mamezu	0:0f6c82fcde82	278	#define SYS_ARCH_PROTECT(lev)
mamezu	0:0f6c82fcde82	279	#define SYS_ARCH_UNPROTECT(lev)
mamezu	0:0f6c82fcde82	280
mamezu	0:0f6c82fcde82	281	#endif /* SYS_LIGHTWEIGHT_PROT */
mamezu	0:0f6c82fcde82	282
mamezu	0:0f6c82fcde82	283	#endif /* SYS_ARCH_PROTECT */
mamezu	0:0f6c82fcde82	284
mamezu	0:0f6c82fcde82	285	/*
mamezu	0:0f6c82fcde82	286	* Macros to set/get and increase/decrease variables in a thread-safe way.
mamezu	0:0f6c82fcde82	287	* Use these for accessing variable that are used from more than one thread.
mamezu	0:0f6c82fcde82	288	*/
mamezu	0:0f6c82fcde82	289
mamezu	0:0f6c82fcde82	290	#ifndef SYS_ARCH_INC
mamezu	0:0f6c82fcde82	291	#define SYS_ARCH_INC(var, val) do { \
mamezu	0:0f6c82fcde82	292	SYS_ARCH_DECL_PROTECT(old_level); \
mamezu	0:0f6c82fcde82	293	SYS_ARCH_PROTECT(old_level); \
mamezu	0:0f6c82fcde82	294	var += val; \
mamezu	0:0f6c82fcde82	295	SYS_ARCH_UNPROTECT(old_level); \
mamezu	0:0f6c82fcde82	296	} while(0)
mamezu	0:0f6c82fcde82	297	#endif /* SYS_ARCH_INC */
mamezu	0:0f6c82fcde82	298
mamezu	0:0f6c82fcde82	299	#ifndef SYS_ARCH_DEC
mamezu	0:0f6c82fcde82	300	#define SYS_ARCH_DEC(var, val) do { \
mamezu	0:0f6c82fcde82	301	SYS_ARCH_DECL_PROTECT(old_level); \
mamezu	0:0f6c82fcde82	302	SYS_ARCH_PROTECT(old_level); \
mamezu	0:0f6c82fcde82	303	var -= val; \
mamezu	0:0f6c82fcde82	304	SYS_ARCH_UNPROTECT(old_level); \
mamezu	0:0f6c82fcde82	305	} while(0)
mamezu	0:0f6c82fcde82	306	#endif /* SYS_ARCH_DEC */
mamezu	0:0f6c82fcde82	307
mamezu	0:0f6c82fcde82	308	#ifndef SYS_ARCH_GET
mamezu	0:0f6c82fcde82	309	#define SYS_ARCH_GET(var, ret) do { \
mamezu	0:0f6c82fcde82	310	SYS_ARCH_DECL_PROTECT(old_level); \
mamezu	0:0f6c82fcde82	311	SYS_ARCH_PROTECT(old_level); \
mamezu	0:0f6c82fcde82	312	ret = var; \
mamezu	0:0f6c82fcde82	313	SYS_ARCH_UNPROTECT(old_level); \
mamezu	0:0f6c82fcde82	314	} while(0)
mamezu	0:0f6c82fcde82	315	#endif /* SYS_ARCH_GET */
mamezu	0:0f6c82fcde82	316
mamezu	0:0f6c82fcde82	317	#ifndef SYS_ARCH_SET
mamezu	0:0f6c82fcde82	318	#define SYS_ARCH_SET(var, val) do { \
mamezu	0:0f6c82fcde82	319	SYS_ARCH_DECL_PROTECT(old_level); \
mamezu	0:0f6c82fcde82	320	SYS_ARCH_PROTECT(old_level); \
mamezu	0:0f6c82fcde82	321	var = val; \
mamezu	0:0f6c82fcde82	322	SYS_ARCH_UNPROTECT(old_level); \
mamezu	0:0f6c82fcde82	323	} while(0)
mamezu	0:0f6c82fcde82	324	#endif /* SYS_ARCH_SET */
mamezu	0:0f6c82fcde82	325
mamezu	0:0f6c82fcde82	326
mamezu	0:0f6c82fcde82	327	#ifdef __cplusplus
mamezu	0:0f6c82fcde82	328	}
mamezu	0:0f6c82fcde82	329	#endif
mamezu	0:0f6c82fcde82	330
mamezu	0:0f6c82fcde82	331	#endif /* __LWIP_SYS_H__ */

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Type:	Library
Created:	09 Dec 2010
Imports:	5699
Forks:	0
Commits:	1
Dependents:	36
Dependencies:	0
Followers:	117

LPC2368/lwip/include/lwip/sys.h@0:0f6c82fcde82, 2010-12-09 (annotated)

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