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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33 #include "lwip/sys.h"
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34 #include "lwip/opt.h"
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35 #include "lwip/def.h"
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36 #include "lwip/memp.h"
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49 sys_mbox_fetch(sys_mbox_t mbox, void **msg)
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52 struct sys_timeouts *timeouts;
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53 struct sys_timeout *tmptimeout;
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54 sys_timeout_handler h;
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59 timeouts = sys_arch_timeouts();
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61 if (!timeouts || !timeouts->next) {
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62 sys_arch_mbox_fetch(mbox, msg, 0);
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64 if (timeouts->next->time > 0) {
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65 time = sys_arch_mbox_fetch(mbox, msg, timeouts->next->time);
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67 time = SYS_ARCH_TIMEOUT;
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70 if (time == SYS_ARCH_TIMEOUT) {
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71 /* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message
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72 could be fetched. We should now call the timeout handler and
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73 deallocate the memory allocated for the timeout. */
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74 tmptimeout = timeouts->next;
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75 timeouts->next = tmptimeout->next;
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77 arg = tmptimeout->arg;
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78 memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
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80 LWIP_DEBUGF(SYS_DEBUG, ("smf calling h=%p(%p)\n", (void *)h, (void *)arg));
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84 /* We try again to fetch a message from the mbox. */
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87 /* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout
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88 occured. The time variable is set to the number of
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89 milliseconds we waited for the message. */
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90 if (time <= timeouts->next->time) {
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91 timeouts->next->time -= time;
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93 timeouts->next->time = 0;
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101 sys_sem_wait(sys_sem_t sem)
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104 struct sys_timeouts *timeouts;
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105 struct sys_timeout *tmptimeout;
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106 sys_timeout_handler h;
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109 /* while (sys_arch_sem_wait(sem, 1000) == 0);
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114 timeouts = sys_arch_timeouts();
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116 if (!timeouts || !timeouts->next) {
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117 sys_arch_sem_wait(sem, 0);
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119 if (timeouts->next->time > 0) {
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120 time = sys_arch_sem_wait(sem, timeouts->next->time);
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122 time = SYS_ARCH_TIMEOUT;
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125 if (time == SYS_ARCH_TIMEOUT) {
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126 /* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message
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127 could be fetched. We should now call the timeout handler and
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128 deallocate the memory allocated for the timeout. */
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129 tmptimeout = timeouts->next;
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130 timeouts->next = tmptimeout->next;
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132 arg = tmptimeout->arg;
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133 memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
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135 LWIP_DEBUGF(SYS_DEBUG, ("ssw h=%p(%p)\n", (void *)h, (void *)arg));
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140 /* We try again to fetch a message from the mbox. */
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143 /* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout
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144 occured. The time variable is set to the number of
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145 milliseconds we waited for the message. */
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146 if (time <= timeouts->next->time) {
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147 timeouts->next->time -= time;
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149 timeouts->next->time = 0;
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157 sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg)
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159 struct sys_timeouts *timeouts;
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160 struct sys_timeout *timeout, *t;
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162 timeout = memp_malloc(MEMP_SYS_TIMEOUT);
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163 if (timeout == NULL) {
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166 timeout->next = NULL;
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168 timeout->arg = arg;
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169 timeout->time = msecs;
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171 timeouts = sys_arch_timeouts();
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173 LWIP_DEBUGF(SYS_DEBUG, ("sys_timeout: %p msecs=%lu h=%p arg=%p\n",
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174 (void *)timeout, msecs, (void *)h, (void *)arg));
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176 LWIP_ASSERT("sys_timeout: timeouts != NULL", timeouts != NULL);
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178 if (timeouts->next == NULL) {
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179 timeouts->next = timeout;
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183 if (timeouts->next->time > msecs) {
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184 timeouts->next->time -= msecs;
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185 timeout->next = timeouts->next;
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186 timeouts->next = timeout;
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188 for(t = timeouts->next; t != NULL; t = t->next) {
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189 timeout->time -= t->time;
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190 if (t->next == NULL || t->next->time > timeout->time) {
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191 if (t->next != NULL) {
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192 t->next->time -= timeout->time;
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194 timeout->next = t->next;
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203 /* Go through timeout list (for this task only) and remove the first matching entry,
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204 even though the timeout has not triggered yet.
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208 sys_untimeout(sys_timeout_handler h, void *arg)
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210 struct sys_timeouts *timeouts;
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211 struct sys_timeout *prev_t, *t;
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213 timeouts = sys_arch_timeouts();
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215 if (timeouts->next == NULL)
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218 for (t = timeouts->next, prev_t = NULL; t != NULL; prev_t = t, t = t->next)
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220 if ((t->h == h) && (t->arg == arg))
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222 /* We have a match */
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223 /* Unlink from previous in list */
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224 if (prev_t == NULL)
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225 timeouts->next = t->next;
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227 prev_t->next = t->next;
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228 /* If not the last one, add time of this one back to next */
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229 if (t->next != NULL)
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230 t->next->time += t->time;
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231 memp_free(MEMP_SYS_TIMEOUT, t);
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243 sswt_handler(void *arg)
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245 struct sswt_cb *sswt_cb = (struct sswt_cb *) arg;
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247 /* Timeout. Set flag to TRUE and signal semaphore */
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248 sswt_cb->timeflag = 1;
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249 sys_sem_signal(*(sswt_cb->psem));
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252 /* Wait for a semaphore with timeout (specified in ms) */
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253 /* timeout = 0: wait forever */
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254 /* Returns 0 on timeout. 1 otherwise */
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257 sys_sem_wait_timeout(sys_sem_t sem, u32_t timeout)
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259 struct sswt_cb sswt_cb;
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261 sswt_cb.psem = &sem;
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262 sswt_cb.timeflag = 0;
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264 /* If timeout is zero, then just wait forever */
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266 /* Create a timer and pass it the address of our flag */
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267 sys_timeout(timeout, sswt_handler, &sswt_cb);
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269 /* Was it a timeout? */
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270 if (sswt_cb.timeflag)
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275 /* Not a timeout. Remove timeout entry */
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276 sys_untimeout(sswt_handler, &sswt_cb);
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284 sys_msleep(u32_t ms)
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286 sys_sem_t delaysem = sys_sem_new(0);
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288 sys_sem_wait_timeout(delaysem, ms);
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290 sys_sem_free(delaysem);
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294 #endif /* NO_SYS */
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