2 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
27 * This file is part of the lwIP TCP/IP stack.
29 * Author: Adam Dunkels <adam@sics.se>
32 #ifndef __LWIP_SYS_H__
33 #define __LWIP_SYS_H__
39 #define SYS_ARCH_DECL_PROTECT(lev)
40 #define SYS_ARCH_PROTECT(lev)
41 #define SYS_ARCH_UNPROTECT(lev)
45 /* For a totally minimal and standalone system, we provide null
46 definitions of the sys_ functions. */
47 typedef u8_t sys_sem_t;
48 typedef u8_t sys_mbox_t;
49 struct sys_timeout {u8_t dummy;};
52 #define sys_timeout(m,h,a)
53 #define sys_sem_new(c) c
54 #define sys_sem_signal(s)
55 #define sys_sem_wait(s)
56 #define sys_sem_free(s)
57 #define sys_mbox_new() 0
58 #define sys_mbox_fetch(m,d)
59 #define sys_mbox_post(m,d)
60 #define sys_mbox_free(m)
62 #define sys_thread_new(t,a)
66 #include "arch/sys_arch.h"
68 typedef void (* sys_timeout_handler)(void *arg);
71 struct sys_timeout *next;
73 sys_timeout_handler h;
78 struct sys_timeout *next;
81 /* sys_init() must be called before anthing else. */
87 * Schedule a timeout a specified amount of milliseconds in the
88 * future. When the timeout occurs, the specified timeout handler will
89 * be called. The handler will be passed the "arg" argument when
93 void sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg);
94 void sys_untimeout(sys_timeout_handler h, void *arg);
95 struct sys_timeouts *sys_arch_timeouts(void);
97 /* Semaphore functions. */
98 sys_sem_t sys_sem_new(u8_t count);
99 void sys_sem_signal(sys_sem_t sem);
100 u32_t sys_arch_sem_wait(sys_sem_t sem, u32_t timeout);
101 void sys_sem_free(sys_sem_t sem);
102 void sys_sem_wait(sys_sem_t sem);
103 int sys_sem_wait_timeout(sys_sem_t sem, u32_t timeout);
105 /* Mailbox functions. */
106 sys_mbox_t sys_mbox_new(void);
107 void sys_mbox_post(sys_mbox_t mbox, void *msg);
108 u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void **msg, u32_t timeout);
109 void sys_mbox_free(sys_mbox_t mbox);
110 void sys_mbox_fetch(sys_mbox_t mbox, void **msg);
112 /* Critical Region Protection */
113 /* These functions must be implemented in the sys_arch.c file.
114 In some implementations they can provide a more light-weight protection
115 mechanism than using semaphores. Otherwise semaphores can be used for
117 #ifndef SYS_ARCH_PROTECT
118 #ifdef SYS_LIGHTWEIGHT_PROT
120 #undef SYS_ARCH_DECL_PROTECT
121 #define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev
122 #undef SYS_ARCH_PROTECT
123 #define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect()
124 #undef SYS_ARCH_UNPROTECT
125 #define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev)
126 sys_prot_t sys_arch_protect(void);
127 void sys_arch_unprotect(sys_prot_t pval);
128 #endif /* SYS_LIGHTWEIGHT_PROT */
130 #endif /* SYS_ARCH_PROTECT */
132 /* Thread functions. */
133 sys_thread_t sys_thread_new(void (* thread)(void *arg), void *arg);
135 /* The following functions are used only in Unix code, and
136 can be omitted when porting the stack. */
137 /* Returns the current time in microseconds. */
138 unsigned long sys_now(void);
142 #endif /* __LWIP_SYS_H__ */