2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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3 * All rights reserved.
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5 * Redistribution and use in source and binary forms, with or without modification,
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6 * are permitted provided that the following conditions are met:
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8 * 1. Redistributions of source code must retain the above copyright notice,
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9 * this list of conditions and the following disclaimer.
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10 * 2. Redistributions in binary form must reproduce the above copyright notice,
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11 * this list of conditions and the following disclaimer in the documentation
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12 * and/or other materials provided with the distribution.
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13 * 3. The name of the author may not be used to endorse or promote products
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14 * derived from this software without specific prior written permission.
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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27 * This file is part of the lwIP TCP/IP stack.
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29 * Author: Adam Dunkels <adam@sics.se>
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32 #ifndef __LWIP_SYS_H__
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33 #define __LWIP_SYS_H__
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35 #include "arch/cc.h"
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37 #include "lwip/opt.h"
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42 /* For a totally minimal and standalone system, we provide null
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43 definitions of the sys_ functions. */
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44 typedef u8_t sys_sem_t;
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45 typedef u8_t sys_mbox_t;
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46 struct sys_timeout {u8_t dummy;};
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49 #define sys_timeout(m,h,a)
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50 #define sys_untimeout(m,a)
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51 #define sys_sem_new(c) c
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52 #define sys_sem_signal(s)
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53 #define sys_sem_wait(s)
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54 #define sys_sem_free(s)
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55 #define sys_mbox_new() 0
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56 #define sys_mbox_fetch(m,d)
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57 #define sys_mbox_post(m,d)
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58 #define sys_mbox_free(m)
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60 #define sys_thread_new(t,a,p)
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64 #include "arch/sys_arch.h"
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66 /** Return code for timeouts from sys_arch_mbox_fetch and sys_arch_sem_wait */
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67 #define SYS_ARCH_TIMEOUT 0xffffffff
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69 typedef void (* sys_timeout_handler)(void *arg);
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71 struct sys_timeout {
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72 struct sys_timeout *next;
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74 sys_timeout_handler h;
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78 struct sys_timeouts {
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79 struct sys_timeout *next;
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82 /* sys_init() must be called before anthing else. */
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83 void sys_init(void);
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88 * Schedule a timeout a specified amount of milliseconds in the
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89 * future. When the timeout occurs, the specified timeout handler will
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90 * be called. The handler will be passed the "arg" argument when
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94 void sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg);
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95 void sys_untimeout(sys_timeout_handler h, void *arg);
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96 struct sys_timeouts *sys_arch_timeouts(void);
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98 /* Semaphore functions. */
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99 sys_sem_t sys_sem_new(u8_t count);
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100 void sys_sem_signal(sys_sem_t sem);
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101 u32_t sys_arch_sem_wait(sys_sem_t sem, u32_t timeout);
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102 void sys_sem_free(sys_sem_t sem);
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103 void sys_sem_wait(sys_sem_t sem);
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104 int sys_sem_wait_timeout(sys_sem_t sem, u32_t timeout);
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106 /* Time functions. */
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108 void sys_msleep(u32_t ms); /* only has a (close to) 1 jiffy resolution. */
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110 #ifndef sys_jiffies
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111 u32_t sys_jiffies(void); /* since power up. */
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114 /* Mailbox functions. */
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115 sys_mbox_t sys_mbox_new(void);
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116 void sys_mbox_post(sys_mbox_t mbox, void *msg);
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117 u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void **msg, u32_t timeout);
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118 void sys_mbox_free(sys_mbox_t mbox);
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119 void sys_mbox_fetch(sys_mbox_t mbox, void **msg);
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122 /* Thread functions. */
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123 sys_thread_t sys_thread_new(void (* thread)(void *arg), void *arg, int prio);
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125 /* The following functions are used only in Unix code, and
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126 can be omitted when porting the stack. */
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127 /* Returns the current time in microseconds. */
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128 unsigned long sys_now(void);
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130 #endif /* NO_SYS */
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132 /* Critical Region Protection */
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133 /* These functions must be implemented in the sys_arch.c file.
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134 In some implementations they can provide a more light-weight protection
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135 mechanism than using semaphores. Otherwise semaphores can be used for
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137 #ifndef SYS_ARCH_PROTECT
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138 /** SYS_LIGHTWEIGHT_PROT
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139 * define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
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140 * for certain critical regions during buffer allocation, deallocation and memory
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141 * allocation and deallocation.
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143 #if SYS_LIGHTWEIGHT_PROT
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145 /** SYS_ARCH_DECL_PROTECT
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146 * declare a protection variable. This macro will default to defining a variable of
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147 * type sys_prot_t. If a particular port needs a different implementation, then
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148 * this macro may be defined in sys_arch.h.
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150 #define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev
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151 /** SYS_ARCH_PROTECT
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152 * Perform a "fast" protect. This could be implemented by
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153 * disabling interrupts for an embedded system or by using a semaphore or
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154 * mutex. The implementation should allow calling SYS_ARCH_PROTECT when
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155 * already protected. The old protection level is returned in the variable
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156 * "lev". This macro will default to calling the sys_arch_protect() function
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157 * which should be implemented in sys_arch.c. If a particular port needs a
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158 * different implementation, then this macro may be defined in sys_arch.h
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160 #define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect()
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161 /** SYS_ARCH_UNPROTECT
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162 * Perform a "fast" set of the protection level to "lev". This could be
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163 * implemented by setting the interrupt level to "lev" within the MACRO or by
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164 * using a semaphore or mutex. This macro will default to calling the
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165 * sys_arch_unprotect() function which should be implemented in
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166 * sys_arch.c. If a particular port needs a different implementation, then
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167 * this macro may be defined in sys_arch.h
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169 #define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev)
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170 sys_prot_t sys_arch_protect(void);
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171 void sys_arch_unprotect(sys_prot_t pval);
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175 #define SYS_ARCH_DECL_PROTECT(lev)
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176 #define SYS_ARCH_PROTECT(lev)
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177 #define SYS_ARCH_UNPROTECT(lev)
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179 #endif /* SYS_LIGHTWEIGHT_PROT */
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181 #endif /* SYS_ARCH_PROTECT */
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183 #endif /* __LWIP_SYS_H__ */
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