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Core/lwIP/include/lwip/sys.h@0:6dee052a3fa4, 2011-07-26 (annotated)

Committer:: nandgate
Date:: Tue Jul 26 05:30:53 2011 +0000
Revision:: 0:6dee052a3fa4

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nandgate	0:6dee052a3fa4	1	/*
nandgate	0:6dee052a3fa4	2	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
nandgate	0:6dee052a3fa4	3	* All rights reserved.
nandgate	0:6dee052a3fa4	4	*
nandgate	0:6dee052a3fa4	5	* Redistribution and use in source and binary forms, with or without modification,
nandgate	0:6dee052a3fa4	6	* are permitted provided that the following conditions are met:
nandgate	0:6dee052a3fa4	7	*
nandgate	0:6dee052a3fa4	8	* 1. Redistributions of source code must retain the above copyright notice,
nandgate	0:6dee052a3fa4	9	* this list of conditions and the following disclaimer.
nandgate	0:6dee052a3fa4	10	* 2. Redistributions in binary form must reproduce the above copyright notice,
nandgate	0:6dee052a3fa4	11	* this list of conditions and the following disclaimer in the documentation
nandgate	0:6dee052a3fa4	12	* and/or other materials provided with the distribution.
nandgate	0:6dee052a3fa4	13	* 3. The name of the author may not be used to endorse or promote products
nandgate	0:6dee052a3fa4	14	* derived from this software without specific prior written permission.
nandgate	0:6dee052a3fa4	15	*
nandgate	0:6dee052a3fa4	16	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
nandgate	0:6dee052a3fa4	17	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
nandgate	0:6dee052a3fa4	18	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
nandgate	0:6dee052a3fa4	19	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
nandgate	0:6dee052a3fa4	20	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
nandgate	0:6dee052a3fa4	21	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
nandgate	0:6dee052a3fa4	22	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
nandgate	0:6dee052a3fa4	23	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
nandgate	0:6dee052a3fa4	24	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
nandgate	0:6dee052a3fa4	25	* OF SUCH DAMAGE.
nandgate	0:6dee052a3fa4	26	*
nandgate	0:6dee052a3fa4	27	* This file is part of the lwIP TCP/IP stack.
nandgate	0:6dee052a3fa4	28	*
nandgate	0:6dee052a3fa4	29	* Author: Adam Dunkels <adam@sics.se>
nandgate	0:6dee052a3fa4	30	*
nandgate	0:6dee052a3fa4	31	*/
nandgate	0:6dee052a3fa4	32	#ifndef __LWIP_SYS_H__
nandgate	0:6dee052a3fa4	33	#define __LWIP_SYS_H__
nandgate	0:6dee052a3fa4	34
nandgate	0:6dee052a3fa4	35	#include "lwip/opt.h"
nandgate	0:6dee052a3fa4	36
nandgate	0:6dee052a3fa4	37	#ifdef __cplusplus
nandgate	0:6dee052a3fa4	38	extern "C" {
nandgate	0:6dee052a3fa4	39	#endif
nandgate	0:6dee052a3fa4	40
nandgate	0:6dee052a3fa4	41	#if NO_SYS
nandgate	0:6dee052a3fa4	42
nandgate	0:6dee052a3fa4	43	/* For a totally minimal and standalone system, we provide null
nandgate	0:6dee052a3fa4	44	definitions of the sys_ functions. */
nandgate	0:6dee052a3fa4	45	typedef u8_t sys_sem_t;
nandgate	0:6dee052a3fa4	46	typedef u8_t sys_mbox_t;
nandgate	0:6dee052a3fa4	47	struct sys_timeo {u8_t dummy;};
nandgate	0:6dee052a3fa4	48
nandgate	0:6dee052a3fa4	49	#define sys_init()
nandgate	0:6dee052a3fa4	50	#define sys_timeout(m,h,a)
nandgate	0:6dee052a3fa4	51	#define sys_untimeout(m,a)
nandgate	0:6dee052a3fa4	52	#define sys_sem_new(c) c
nandgate	0:6dee052a3fa4	53	#define sys_sem_signal(s)
nandgate	0:6dee052a3fa4	54	#define sys_sem_wait(s)
nandgate	0:6dee052a3fa4	55	#define sys_sem_wait_timeout(s,t)
nandgate	0:6dee052a3fa4	56	#define sys_arch_sem_wait(s,t)
nandgate	0:6dee052a3fa4	57	#define sys_sem_free(s)
nandgate	0:6dee052a3fa4	58	#define sys_mbox_new(s) 0
nandgate	0:6dee052a3fa4	59	#define sys_mbox_fetch(m,d)
nandgate	0:6dee052a3fa4	60	#define sys_mbox_tryfetch(m,d)
nandgate	0:6dee052a3fa4	61	#define sys_mbox_post(m,d)
nandgate	0:6dee052a3fa4	62	#define sys_mbox_trypost(m,d)
nandgate	0:6dee052a3fa4	63	#define sys_mbox_free(m)
nandgate	0:6dee052a3fa4	64
nandgate	0:6dee052a3fa4	65	#define sys_thread_new(n,t,a,s,p)
nandgate	0:6dee052a3fa4	66
nandgate	0:6dee052a3fa4	67	#else /* NO_SYS */
nandgate	0:6dee052a3fa4	68
nandgate	0:6dee052a3fa4	69	/** Return code for timeouts from sys_arch_mbox_fetch and sys_arch_sem_wait */
nandgate	0:6dee052a3fa4	70	#define SYS_ARCH_TIMEOUT 0xffffffffUL
nandgate	0:6dee052a3fa4	71
nandgate	0:6dee052a3fa4	72	/* sys_mbox_tryfetch returns SYS_MBOX_EMPTY if appropriate.
nandgate	0:6dee052a3fa4	73	* For now we use the same magic value, but we allow this to change in future.
nandgate	0:6dee052a3fa4	74	*/
nandgate	0:6dee052a3fa4	75	#define SYS_MBOX_EMPTY SYS_ARCH_TIMEOUT
nandgate	0:6dee052a3fa4	76
nandgate	0:6dee052a3fa4	77	#include "lwip/err.h"
nandgate	0:6dee052a3fa4	78	#include "arch/sys_arch.h"
nandgate	0:6dee052a3fa4	79
nandgate	0:6dee052a3fa4	80	typedef void (* sys_timeout_handler)(void *arg);
nandgate	0:6dee052a3fa4	81
nandgate	0:6dee052a3fa4	82	struct sys_timeo {
nandgate	0:6dee052a3fa4	83	struct sys_timeo *next;
nandgate	0:6dee052a3fa4	84	u32_t time;
nandgate	0:6dee052a3fa4	85	sys_timeout_handler h;
nandgate	0:6dee052a3fa4	86	void *arg;
nandgate	0:6dee052a3fa4	87	};
nandgate	0:6dee052a3fa4	88
nandgate	0:6dee052a3fa4	89	struct sys_timeouts {
nandgate	0:6dee052a3fa4	90	struct sys_timeo *next;
nandgate	0:6dee052a3fa4	91	};
nandgate	0:6dee052a3fa4	92
nandgate	0:6dee052a3fa4	93	/* sys_init() must be called before anthing else. */
nandgate	0:6dee052a3fa4	94	void sys_init(void);
nandgate	0:6dee052a3fa4	95
nandgate	0:6dee052a3fa4	96	/*
nandgate	0:6dee052a3fa4	97	* sys_timeout():
nandgate	0:6dee052a3fa4	98	*
nandgate	0:6dee052a3fa4	99	* Schedule a timeout a specified amount of milliseconds in the
nandgate	0:6dee052a3fa4	100	* future. When the timeout occurs, the specified timeout handler will
nandgate	0:6dee052a3fa4	101	* be called. The handler will be passed the "arg" argument when
nandgate	0:6dee052a3fa4	102	* called.
nandgate	0:6dee052a3fa4	103	*
nandgate	0:6dee052a3fa4	104	*/
nandgate	0:6dee052a3fa4	105	void sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg);
nandgate	0:6dee052a3fa4	106	void sys_untimeout(sys_timeout_handler h, void *arg);
nandgate	0:6dee052a3fa4	107	struct sys_timeouts *sys_arch_timeouts(void);
nandgate	0:6dee052a3fa4	108
nandgate	0:6dee052a3fa4	109	/* Semaphore functions. */
nandgate	0:6dee052a3fa4	110	sys_sem_t sys_sem_new(u8_t count);
nandgate	0:6dee052a3fa4	111	void sys_sem_signal(sys_sem_t sem);
nandgate	0:6dee052a3fa4	112	u32_t sys_arch_sem_wait(sys_sem_t sem, u32_t timeout);
nandgate	0:6dee052a3fa4	113	void sys_sem_free(sys_sem_t sem);
nandgate	0:6dee052a3fa4	114	void sys_sem_wait(sys_sem_t sem);
nandgate	0:6dee052a3fa4	115	int sys_sem_wait_timeout(sys_sem_t sem, u32_t timeout);
nandgate	0:6dee052a3fa4	116
nandgate	0:6dee052a3fa4	117	/* Time functions. */
nandgate	0:6dee052a3fa4	118	#ifndef sys_msleep
nandgate	0:6dee052a3fa4	119	void sys_msleep(u32_t ms); /* only has a (close to) 1 jiffy resolution. */
nandgate	0:6dee052a3fa4	120	#endif
nandgate	0:6dee052a3fa4	121	#ifndef sys_jiffies
nandgate	0:6dee052a3fa4	122	u32_t sys_jiffies(void); /* since power up. */
nandgate	0:6dee052a3fa4	123	#endif
nandgate	0:6dee052a3fa4	124
nandgate	0:6dee052a3fa4	125	/* Mailbox functions. */
nandgate	0:6dee052a3fa4	126	sys_mbox_t sys_mbox_new(int size);
nandgate	0:6dee052a3fa4	127	void sys_mbox_post(sys_mbox_t mbox, void *msg);
nandgate	0:6dee052a3fa4	128	err_t sys_mbox_trypost(sys_mbox_t mbox, void *msg);
nandgate	0:6dee052a3fa4	129	u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void **msg, u32_t timeout);
nandgate	0:6dee052a3fa4	130	#ifndef sys_arch_mbox_tryfetch /* Allow port to override with a macro */
nandgate	0:6dee052a3fa4	131	u32_t sys_arch_mbox_tryfetch(sys_mbox_t mbox, void **msg);
nandgate	0:6dee052a3fa4	132	#endif
nandgate	0:6dee052a3fa4	133	/* For now, we map straight to sys_arch implementation. */
nandgate	0:6dee052a3fa4	134	#define sys_mbox_tryfetch(mbox, msg) sys_arch_mbox_tryfetch(mbox, msg)
nandgate	0:6dee052a3fa4	135	void sys_mbox_free(sys_mbox_t mbox);
nandgate	0:6dee052a3fa4	136	void sys_mbox_fetch(sys_mbox_t mbox, void **msg);
nandgate	0:6dee052a3fa4	137
nandgate	0:6dee052a3fa4	138	/* Thread functions. */
nandgate	0:6dee052a3fa4	139	sys_thread_t sys_thread_new(char name, void ( thread)(void arg), void arg, int stacksize, int prio);
nandgate	0:6dee052a3fa4	140
nandgate	0:6dee052a3fa4	141	#endif /* NO_SYS */
nandgate	0:6dee052a3fa4	142
nandgate	0:6dee052a3fa4	143	/** Returns the current time in milliseconds. */
nandgate	0:6dee052a3fa4	144	u32_t sys_now(void);
nandgate	0:6dee052a3fa4	145
nandgate	0:6dee052a3fa4	146	/* Critical Region Protection */
nandgate	0:6dee052a3fa4	147	/* These functions must be implemented in the sys_arch.c file.
nandgate	0:6dee052a3fa4	148	In some implementations they can provide a more light-weight protection
nandgate	0:6dee052a3fa4	149	mechanism than using semaphores. Otherwise semaphores can be used for
nandgate	0:6dee052a3fa4	150	implementation */
nandgate	0:6dee052a3fa4	151	#ifndef SYS_ARCH_PROTECT
nandgate	0:6dee052a3fa4	152	/** SYS_LIGHTWEIGHT_PROT
nandgate	0:6dee052a3fa4	153	* define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
nandgate	0:6dee052a3fa4	154	* for certain critical regions during buffer allocation, deallocation and memory
nandgate	0:6dee052a3fa4	155	* allocation and deallocation.
nandgate	0:6dee052a3fa4	156	*/
nandgate	0:6dee052a3fa4	157	#if SYS_LIGHTWEIGHT_PROT
nandgate	0:6dee052a3fa4	158
nandgate	0:6dee052a3fa4	159	/** SYS_ARCH_DECL_PROTECT
nandgate	0:6dee052a3fa4	160	* declare a protection variable. This macro will default to defining a variable of
nandgate	0:6dee052a3fa4	161	* type sys_prot_t. If a particular port needs a different implementation, then
nandgate	0:6dee052a3fa4	162	* this macro may be defined in sys_arch.h.
nandgate	0:6dee052a3fa4	163	*/
nandgate	0:6dee052a3fa4	164	#define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev
nandgate	0:6dee052a3fa4	165	/** SYS_ARCH_PROTECT
nandgate	0:6dee052a3fa4	166	* Perform a "fast" protect. This could be implemented by
nandgate	0:6dee052a3fa4	167	* disabling interrupts for an embedded system or by using a semaphore or
nandgate	0:6dee052a3fa4	168	* mutex. The implementation should allow calling SYS_ARCH_PROTECT when
nandgate	0:6dee052a3fa4	169	* already protected. The old protection level is returned in the variable
nandgate	0:6dee052a3fa4	170	* "lev". This macro will default to calling the sys_arch_protect() function
nandgate	0:6dee052a3fa4	171	* which should be implemented in sys_arch.c. If a particular port needs a
nandgate	0:6dee052a3fa4	172	* different implementation, then this macro may be defined in sys_arch.h
nandgate	0:6dee052a3fa4	173	*/
nandgate	0:6dee052a3fa4	174	#define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect()
nandgate	0:6dee052a3fa4	175	/** SYS_ARCH_UNPROTECT
nandgate	0:6dee052a3fa4	176	* Perform a "fast" set of the protection level to "lev". This could be
nandgate	0:6dee052a3fa4	177	* implemented by setting the interrupt level to "lev" within the MACRO or by
nandgate	0:6dee052a3fa4	178	* using a semaphore or mutex. This macro will default to calling the
nandgate	0:6dee052a3fa4	179	* sys_arch_unprotect() function which should be implemented in
nandgate	0:6dee052a3fa4	180	* sys_arch.c. If a particular port needs a different implementation, then
nandgate	0:6dee052a3fa4	181	* this macro may be defined in sys_arch.h
nandgate	0:6dee052a3fa4	182	*/
nandgate	0:6dee052a3fa4	183	#define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev)
nandgate	0:6dee052a3fa4	184	sys_prot_t sys_arch_protect(void);
nandgate	0:6dee052a3fa4	185	void sys_arch_unprotect(sys_prot_t pval);
nandgate	0:6dee052a3fa4	186
nandgate	0:6dee052a3fa4	187	#else
nandgate	0:6dee052a3fa4	188
nandgate	0:6dee052a3fa4	189	#define SYS_ARCH_DECL_PROTECT(lev)
nandgate	0:6dee052a3fa4	190	#define SYS_ARCH_PROTECT(lev)
nandgate	0:6dee052a3fa4	191	#define SYS_ARCH_UNPROTECT(lev)
nandgate	0:6dee052a3fa4	192
nandgate	0:6dee052a3fa4	193	#endif /* SYS_LIGHTWEIGHT_PROT */
nandgate	0:6dee052a3fa4	194
nandgate	0:6dee052a3fa4	195	#endif /* SYS_ARCH_PROTECT */
nandgate	0:6dee052a3fa4	196
nandgate	0:6dee052a3fa4	197	/*
nandgate	0:6dee052a3fa4	198	* Macros to set/get and increase/decrease variables in a thread-safe way.
nandgate	0:6dee052a3fa4	199	* Use these for accessing variable that are used from more than one thread.
nandgate	0:6dee052a3fa4	200	*/
nandgate	0:6dee052a3fa4	201
nandgate	0:6dee052a3fa4	202	#ifndef SYS_ARCH_INC
nandgate	0:6dee052a3fa4	203	#define SYS_ARCH_INC(var, val) do { \
nandgate	0:6dee052a3fa4	204	SYS_ARCH_DECL_PROTECT(old_level); \
nandgate	0:6dee052a3fa4	205	SYS_ARCH_PROTECT(old_level); \
nandgate	0:6dee052a3fa4	206	var += val; \
nandgate	0:6dee052a3fa4	207	SYS_ARCH_UNPROTECT(old_level); \
nandgate	0:6dee052a3fa4	208	} while(0)
nandgate	0:6dee052a3fa4	209	#endif /* SYS_ARCH_INC */
nandgate	0:6dee052a3fa4	210
nandgate	0:6dee052a3fa4	211	#ifndef SYS_ARCH_DEC
nandgate	0:6dee052a3fa4	212	#define SYS_ARCH_DEC(var, val) do { \
nandgate	0:6dee052a3fa4	213	SYS_ARCH_DECL_PROTECT(old_level); \
nandgate	0:6dee052a3fa4	214	SYS_ARCH_PROTECT(old_level); \
nandgate	0:6dee052a3fa4	215	var -= val; \
nandgate	0:6dee052a3fa4	216	SYS_ARCH_UNPROTECT(old_level); \
nandgate	0:6dee052a3fa4	217	} while(0)
nandgate	0:6dee052a3fa4	218	#endif /* SYS_ARCH_DEC */
nandgate	0:6dee052a3fa4	219
nandgate	0:6dee052a3fa4	220	#ifndef SYS_ARCH_GET
nandgate	0:6dee052a3fa4	221	#define SYS_ARCH_GET(var, ret) do { \
nandgate	0:6dee052a3fa4	222	SYS_ARCH_DECL_PROTECT(old_level); \
nandgate	0:6dee052a3fa4	223	SYS_ARCH_PROTECT(old_level); \
nandgate	0:6dee052a3fa4	224	ret = var; \
nandgate	0:6dee052a3fa4	225	SYS_ARCH_UNPROTECT(old_level); \
nandgate	0:6dee052a3fa4	226	} while(0)
nandgate	0:6dee052a3fa4	227	#endif /* SYS_ARCH_GET */
nandgate	0:6dee052a3fa4	228
nandgate	0:6dee052a3fa4	229	#ifndef SYS_ARCH_SET
nandgate	0:6dee052a3fa4	230	#define SYS_ARCH_SET(var, val) do { \
nandgate	0:6dee052a3fa4	231	SYS_ARCH_DECL_PROTECT(old_level); \
nandgate	0:6dee052a3fa4	232	SYS_ARCH_PROTECT(old_level); \
nandgate	0:6dee052a3fa4	233	var = val; \
nandgate	0:6dee052a3fa4	234	SYS_ARCH_UNPROTECT(old_level); \
nandgate	0:6dee052a3fa4	235	} while(0)
nandgate	0:6dee052a3fa4	236	#endif /* SYS_ARCH_SET */
nandgate	0:6dee052a3fa4	237
nandgate	0:6dee052a3fa4	238
nandgate	0:6dee052a3fa4	239	#ifdef __cplusplus
nandgate	0:6dee052a3fa4	240	}
nandgate	0:6dee052a3fa4	241	#endif
nandgate	0:6dee052a3fa4	242
nandgate	0:6dee052a3fa4	243	#endif /* __LWIP_SYS_H__ */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	26 Jul 2011
Imports:	159
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	2
Followers:	9

Core/lwIP/include/lwip/sys.h@0:6dee052a3fa4, 2011-07-26 (annotated)

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