| /* |
| * 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" |
| |
| |
| #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 */ |
| |
| #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); |
| |
| struct sys_timeout { |
| struct sys_timeout *next; |
| u32_t time; |
| sys_timeout_handler h; |
| void *arg; |
| }; |
| |
| 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. |
| * |
| */ |
| void sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg); |
| void sys_untimeout(sys_timeout_handler h, void *arg); |
| struct sys_timeouts *sys_arch_timeouts(void); |
| |
| /* Semaphore functions. */ |
| 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); |
| |
| /* Time functions. */ |
| #ifndef sys_msleep |
| void sys_msleep(u32_t ms); /* only has a (close to) 1 jiffy resolution. */ |
| #endif |
| #ifndef sys_jiffies |
| u32_t sys_jiffies(void); /* since power up. */ |
| #endif |
| |
| /* 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); |
| |
| |
| /* 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__ */ |