sys.h
上传用户:yyhongfa
上传日期:2013-01-18
资源大小:267k
文件大小:7k
- /*
- * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
- * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
- * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
- * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGE.
- *
- * This file is part of the lwIP TCP/IP stack.
- *
- * Author: Adam Dunkels <adam@sics.se>
- *
- */
- #ifndef __LWIP_SYS_H__
- #define __LWIP_SYS_H__
- //#include "arch/cc.h"
- #include "lwip/opt.h"
- typedef u8_t sys_sem_t;
- typedef u8_t sys_mbox_t;
- typedef u32_t mem_ptr_t;
- #if NO_SYS
- /* For a totally minimal and standalone system, we provide null
- definitions of the sys_ functions. */
- //typedef u8_t sys_sem_t;
- //typedef u8_t sys_mbox_t;
- //struct sys_timeout {u8_t dummy;};
- #define sys_init()
- #define sys_timeout(m,h,a)
- #define sys_untimeout(m,a)
- #define sys_sem_new(c) c
- #define sys_sem_signal(s)
- #define sys_sem_wait(s)
- #define sys_sem_free(s)
- #define sys_mbox_new() 0
- #define sys_mbox_fetch(m,d)
- #define sys_mbox_post(m,d)
- #define sys_mbox_free(m)
- #define sys_thread_new(t,a,p)
- #else /* NO_SYS */
- #define sys_sem_new(c) c
- #define sys_sem_wait(s)
- #define sys_sem_signal(s)
- //#include "arch/sys_arch.h"
- /** Return code for timeouts from sys_arch_mbox_fetch and sys_arch_sem_wait */
- #define SYS_ARCH_TIMEOUT 0xffffffff
- typedef void (* sys_timeout_handler)(void *arg);
- //#define sys_timeout_handler void (* timeout)(void *arg);
- /*Begin:Modified by zhouzhigang40410 2005.01.17*/
- /*struct sys_timeout {
- struct sys_timeout *next;
- u32_t time;
- sys_timeout_handler h;
- void *arg;
- };*/
- typedef struct
- {
- sys_timeout_handler h;
- void *arg;
- u32_t ms_time;
- }sys_timeout;
- #define TCP_TIMER_START(t, f, a) sys_timer_start((t), (f), (a))
- #define TCP_TIMER_STOP(f, a) sys_timer_stop((f), (a))
- /*End:Modified by zhouzhigang40410 2005.01.17*/
- #ifndef MAX_SYS_TIMER
- #define MAX_SYS_TIMER 3
- #endif
- /*struct sys_timeouts {
- struct sys_timeout *next;
- };*/
- /* sys_init() must be called before anthing else. */
- void sys_init(void);
- /*
- * sys_timeout():
- *
- * Schedule a timeout a specified amount of milliseconds in the
- * future. When the timeout occurs, the specified timeout handler will
- * be called. The handler will be passed the "arg" argument when
- * called.
- *
- */
- //extern sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg);
- //extern sys_untimeout(sys_timeout_handler h, void *arg);
- //struct sys_timeouts *sys_arch_timeouts(void);
- /* Semaphore functions. */
- #if 0
- sys_sem_t sys_sem_new(u8_t count);
- void sys_sem_signal(sys_sem_t sem);
- u32_t sys_arch_sem_wait(sys_sem_t sem, u32_t timeout);
- void sys_sem_free(sys_sem_t sem);
- void sys_sem_wait(sys_sem_t sem);
- int sys_sem_wait_timeout(sys_sem_t sem, u32_t timeout);
- #endif
- /* Time functions. */
- #ifndef sys_msleep
- void sys_msleep(u32_t ms); /* only has a (close to) 1 jiffy resolution. */
- #endif
- #ifndef sys_jiffies
- extern u32_t sys_jiffies(void); /* since power up. */
- #endif
- #if 0
- /* Mailbox functions. */
- sys_mbox_t sys_mbox_new(void);
- void sys_mbox_post(sys_mbox_t mbox, void *msg);
- u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void **msg, u32_t timeout);
- void sys_mbox_free(sys_mbox_t mbox);
- void sys_mbox_fetch(sys_mbox_t mbox, void **msg);
- #endif
- /* Thread functions. */
- //sys_thread_t sys_thread_new(void (* thread)(void *arg), void *arg, int prio);
- /* The following functions are used only in Unix code, and
- can be omitted when porting the stack. */
- /* Returns the current time in microseconds. */
- unsigned long sys_now(void);
- #endif /* NO_SYS */
- /* Critical Region Protection */
- /* These functions must be implemented in the sys_arch.c file.
- In some implementations they can provide a more light-weight protection
- mechanism than using semaphores. Otherwise semaphores can be used for
- implementation */
- #ifndef SYS_ARCH_PROTECT
- /** SYS_LIGHTWEIGHT_PROT
- * define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
- * for certain critical regions during buffer allocation, deallocation and memory
- * allocation and deallocation.
- */
- #if SYS_LIGHTWEIGHT_PROT
- /** SYS_ARCH_DECL_PROTECT
- * declare a protection variable. This macro will default to defining a variable of
- * type sys_prot_t. If a particular port needs a different implementation, then
- * this macro may be defined in sys_arch.h.
- */
- #define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev
- /** SYS_ARCH_PROTECT
- * Perform a "fast" protect. This could be implemented by
- * disabling interrupts for an embedded system or by using a semaphore or
- * mutex. The implementation should allow calling SYS_ARCH_PROTECT when
- * already protected. The old protection level is returned in the variable
- * "lev". This macro will default to calling the sys_arch_protect() function
- * which should be implemented in sys_arch.c. If a particular port needs a
- * different implementation, then this macro may be defined in sys_arch.h
- */
- #define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect()
- /** SYS_ARCH_UNPROTECT
- * Perform a "fast" set of the protection level to "lev". This could be
- * implemented by setting the interrupt level to "lev" within the MACRO or by
- * using a semaphore or mutex. This macro will default to calling the
- * sys_arch_unprotect() function which should be implemented in
- * sys_arch.c. If a particular port needs a different implementation, then
- * this macro may be defined in sys_arch.h
- */
- #define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev)
- sys_prot_t sys_arch_protect(void);
- void sys_arch_unprotect(sys_prot_t pval);
- #else
- #define SYS_ARCH_DECL_PROTECT(lev)
- #define SYS_ARCH_PROTECT(lev)
- #define SYS_ARCH_UNPROTECT(lev)
- #endif /* SYS_LIGHTWEIGHT_PROT */
- #endif /* SYS_ARCH_PROTECT */
- #endif /* __LWIP_SYS_H__ */