My fork of the HTTPServer (working)
Core/lwIP/core/sys.c@1:284f2df30cf9, 2012-11-20 (annotated)
- Committer:
- screamer
- Date:
- Tue Nov 20 12:18:53 2012 +0000
- Revision:
- 1:284f2df30cf9
- Parent:
- 0:7a64fbb4069d
local changes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
screamer | 0:7a64fbb4069d | 1 | /** |
screamer | 0:7a64fbb4069d | 2 | * @file |
screamer | 0:7a64fbb4069d | 3 | * lwIP Operating System abstraction |
screamer | 0:7a64fbb4069d | 4 | * |
screamer | 0:7a64fbb4069d | 5 | */ |
screamer | 0:7a64fbb4069d | 6 | |
screamer | 0:7a64fbb4069d | 7 | /* |
screamer | 0:7a64fbb4069d | 8 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
screamer | 0:7a64fbb4069d | 9 | * All rights reserved. |
screamer | 0:7a64fbb4069d | 10 | * |
screamer | 0:7a64fbb4069d | 11 | * Redistribution and use in source and binary forms, with or without modification, |
screamer | 0:7a64fbb4069d | 12 | * are permitted provided that the following conditions are met: |
screamer | 0:7a64fbb4069d | 13 | * |
screamer | 0:7a64fbb4069d | 14 | * 1. Redistributions of source code must retain the above copyright notice, |
screamer | 0:7a64fbb4069d | 15 | * this list of conditions and the following disclaimer. |
screamer | 0:7a64fbb4069d | 16 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
screamer | 0:7a64fbb4069d | 17 | * this list of conditions and the following disclaimer in the documentation |
screamer | 0:7a64fbb4069d | 18 | * and/or other materials provided with the distribution. |
screamer | 0:7a64fbb4069d | 19 | * 3. The name of the author may not be used to endorse or promote products |
screamer | 0:7a64fbb4069d | 20 | * derived from this software without specific prior written permission. |
screamer | 0:7a64fbb4069d | 21 | * |
screamer | 0:7a64fbb4069d | 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
screamer | 0:7a64fbb4069d | 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
screamer | 0:7a64fbb4069d | 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
screamer | 0:7a64fbb4069d | 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
screamer | 0:7a64fbb4069d | 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
screamer | 0:7a64fbb4069d | 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
screamer | 0:7a64fbb4069d | 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
screamer | 0:7a64fbb4069d | 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
screamer | 0:7a64fbb4069d | 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
screamer | 0:7a64fbb4069d | 31 | * OF SUCH DAMAGE. |
screamer | 0:7a64fbb4069d | 32 | * |
screamer | 0:7a64fbb4069d | 33 | * This file is part of the lwIP TCP/IP stack. |
screamer | 0:7a64fbb4069d | 34 | * |
screamer | 0:7a64fbb4069d | 35 | * Author: Adam Dunkels <adam@sics.se> |
screamer | 0:7a64fbb4069d | 36 | * |
screamer | 0:7a64fbb4069d | 37 | */ |
screamer | 0:7a64fbb4069d | 38 | |
screamer | 0:7a64fbb4069d | 39 | #include "lwip/opt.h" |
screamer | 0:7a64fbb4069d | 40 | |
screamer | 0:7a64fbb4069d | 41 | #if (NO_SYS == 0) /* don't build if not configured for use in lwipopts.h */ |
screamer | 0:7a64fbb4069d | 42 | |
screamer | 0:7a64fbb4069d | 43 | #include "lwip/sys.h" |
screamer | 0:7a64fbb4069d | 44 | #include "lwip/def.h" |
screamer | 0:7a64fbb4069d | 45 | #include "lwip/memp.h" |
screamer | 0:7a64fbb4069d | 46 | #include "lwip/tcpip.h" |
screamer | 0:7a64fbb4069d | 47 | |
screamer | 0:7a64fbb4069d | 48 | /** |
screamer | 0:7a64fbb4069d | 49 | * Struct used for sys_sem_wait_timeout() to tell wether the time |
screamer | 0:7a64fbb4069d | 50 | * has run out or the semaphore has really become available. |
screamer | 0:7a64fbb4069d | 51 | */ |
screamer | 0:7a64fbb4069d | 52 | struct sswt_cb |
screamer | 0:7a64fbb4069d | 53 | { |
screamer | 0:7a64fbb4069d | 54 | s16_t timeflag; |
screamer | 0:7a64fbb4069d | 55 | sys_sem_t *psem; |
screamer | 0:7a64fbb4069d | 56 | }; |
screamer | 0:7a64fbb4069d | 57 | |
screamer | 0:7a64fbb4069d | 58 | /** |
screamer | 0:7a64fbb4069d | 59 | * Wait (forever) for a message to arrive in an mbox. |
screamer | 0:7a64fbb4069d | 60 | * While waiting, timeouts (for this thread) are processed. |
screamer | 0:7a64fbb4069d | 61 | * |
screamer | 0:7a64fbb4069d | 62 | * @param mbox the mbox to fetch the message from |
screamer | 0:7a64fbb4069d | 63 | * @param msg the place to store the message |
screamer | 0:7a64fbb4069d | 64 | */ |
screamer | 0:7a64fbb4069d | 65 | void |
screamer | 0:7a64fbb4069d | 66 | sys_mbox_fetch(sys_mbox_t mbox, void **msg) |
screamer | 0:7a64fbb4069d | 67 | { |
screamer | 0:7a64fbb4069d | 68 | u32_t time_needed; |
screamer | 0:7a64fbb4069d | 69 | struct sys_timeouts *timeouts; |
screamer | 0:7a64fbb4069d | 70 | struct sys_timeo *tmptimeout; |
screamer | 0:7a64fbb4069d | 71 | sys_timeout_handler h; |
screamer | 0:7a64fbb4069d | 72 | void *arg; |
screamer | 0:7a64fbb4069d | 73 | |
screamer | 0:7a64fbb4069d | 74 | again: |
screamer | 0:7a64fbb4069d | 75 | timeouts = sys_arch_timeouts(); |
screamer | 0:7a64fbb4069d | 76 | |
screamer | 0:7a64fbb4069d | 77 | if (!timeouts || !timeouts->next) { |
screamer | 0:7a64fbb4069d | 78 | UNLOCK_TCPIP_CORE(); |
screamer | 0:7a64fbb4069d | 79 | time_needed = sys_arch_mbox_fetch(mbox, msg, 0); |
screamer | 0:7a64fbb4069d | 80 | LOCK_TCPIP_CORE(); |
screamer | 0:7a64fbb4069d | 81 | } else { |
screamer | 0:7a64fbb4069d | 82 | if (timeouts->next->time > 0) { |
screamer | 0:7a64fbb4069d | 83 | UNLOCK_TCPIP_CORE(); |
screamer | 0:7a64fbb4069d | 84 | time_needed = sys_arch_mbox_fetch(mbox, msg, timeouts->next->time); |
screamer | 0:7a64fbb4069d | 85 | LOCK_TCPIP_CORE(); |
screamer | 0:7a64fbb4069d | 86 | } else { |
screamer | 0:7a64fbb4069d | 87 | time_needed = SYS_ARCH_TIMEOUT; |
screamer | 0:7a64fbb4069d | 88 | } |
screamer | 0:7a64fbb4069d | 89 | |
screamer | 0:7a64fbb4069d | 90 | if (time_needed == SYS_ARCH_TIMEOUT) { |
screamer | 0:7a64fbb4069d | 91 | /* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message |
screamer | 0:7a64fbb4069d | 92 | could be fetched. We should now call the timeout handler and |
screamer | 0:7a64fbb4069d | 93 | deallocate the memory allocated for the timeout. */ |
screamer | 0:7a64fbb4069d | 94 | tmptimeout = timeouts->next; |
screamer | 0:7a64fbb4069d | 95 | timeouts->next = tmptimeout->next; |
screamer | 0:7a64fbb4069d | 96 | h = tmptimeout->h; |
screamer | 0:7a64fbb4069d | 97 | arg = tmptimeout->arg; |
screamer | 0:7a64fbb4069d | 98 | memp_free(MEMP_SYS_TIMEOUT, tmptimeout); |
screamer | 0:7a64fbb4069d | 99 | if (h != NULL) { |
screamer | 0:7a64fbb4069d | 100 | LWIP_DEBUGF(SYS_DEBUG, ("smf calling h=%p(%p)\n", (void*)&h, arg)); |
screamer | 0:7a64fbb4069d | 101 | h(arg); |
screamer | 0:7a64fbb4069d | 102 | } |
screamer | 0:7a64fbb4069d | 103 | |
screamer | 0:7a64fbb4069d | 104 | /* We try again to fetch a message from the mbox. */ |
screamer | 0:7a64fbb4069d | 105 | goto again; |
screamer | 0:7a64fbb4069d | 106 | } else { |
screamer | 0:7a64fbb4069d | 107 | /* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout |
screamer | 0:7a64fbb4069d | 108 | occured. The time variable is set to the number of |
screamer | 0:7a64fbb4069d | 109 | milliseconds we waited for the message. */ |
screamer | 0:7a64fbb4069d | 110 | if (time_needed < timeouts->next->time) { |
screamer | 0:7a64fbb4069d | 111 | timeouts->next->time -= time_needed; |
screamer | 0:7a64fbb4069d | 112 | } else { |
screamer | 0:7a64fbb4069d | 113 | timeouts->next->time = 0; |
screamer | 0:7a64fbb4069d | 114 | } |
screamer | 0:7a64fbb4069d | 115 | } |
screamer | 0:7a64fbb4069d | 116 | } |
screamer | 0:7a64fbb4069d | 117 | } |
screamer | 0:7a64fbb4069d | 118 | |
screamer | 0:7a64fbb4069d | 119 | /** |
screamer | 0:7a64fbb4069d | 120 | * Wait (forever) for a semaphore to become available. |
screamer | 0:7a64fbb4069d | 121 | * While waiting, timeouts (for this thread) are processed. |
screamer | 0:7a64fbb4069d | 122 | * |
screamer | 0:7a64fbb4069d | 123 | * @param sem semaphore to wait for |
screamer | 0:7a64fbb4069d | 124 | */ |
screamer | 0:7a64fbb4069d | 125 | void |
screamer | 0:7a64fbb4069d | 126 | sys_sem_wait(sys_sem_t sem) |
screamer | 0:7a64fbb4069d | 127 | { |
screamer | 0:7a64fbb4069d | 128 | u32_t time_needed; |
screamer | 0:7a64fbb4069d | 129 | struct sys_timeouts *timeouts; |
screamer | 0:7a64fbb4069d | 130 | struct sys_timeo *tmptimeout; |
screamer | 0:7a64fbb4069d | 131 | sys_timeout_handler h; |
screamer | 0:7a64fbb4069d | 132 | void *arg; |
screamer | 0:7a64fbb4069d | 133 | |
screamer | 0:7a64fbb4069d | 134 | again: |
screamer | 0:7a64fbb4069d | 135 | |
screamer | 0:7a64fbb4069d | 136 | timeouts = sys_arch_timeouts(); |
screamer | 0:7a64fbb4069d | 137 | |
screamer | 0:7a64fbb4069d | 138 | if (!timeouts || !timeouts->next) { |
screamer | 0:7a64fbb4069d | 139 | sys_arch_sem_wait(sem, 0); |
screamer | 0:7a64fbb4069d | 140 | } else { |
screamer | 0:7a64fbb4069d | 141 | if (timeouts->next->time > 0) { |
screamer | 0:7a64fbb4069d | 142 | time_needed = sys_arch_sem_wait(sem, timeouts->next->time); |
screamer | 0:7a64fbb4069d | 143 | } else { |
screamer | 0:7a64fbb4069d | 144 | time_needed = SYS_ARCH_TIMEOUT; |
screamer | 0:7a64fbb4069d | 145 | } |
screamer | 0:7a64fbb4069d | 146 | |
screamer | 0:7a64fbb4069d | 147 | if (time_needed == SYS_ARCH_TIMEOUT) { |
screamer | 0:7a64fbb4069d | 148 | /* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message |
screamer | 0:7a64fbb4069d | 149 | could be fetched. We should now call the timeout handler and |
screamer | 0:7a64fbb4069d | 150 | deallocate the memory allocated for the timeout. */ |
screamer | 0:7a64fbb4069d | 151 | tmptimeout = timeouts->next; |
screamer | 0:7a64fbb4069d | 152 | timeouts->next = tmptimeout->next; |
screamer | 0:7a64fbb4069d | 153 | h = tmptimeout->h; |
screamer | 0:7a64fbb4069d | 154 | arg = tmptimeout->arg; |
screamer | 0:7a64fbb4069d | 155 | memp_free(MEMP_SYS_TIMEOUT, tmptimeout); |
screamer | 0:7a64fbb4069d | 156 | if (h != NULL) { |
screamer | 0:7a64fbb4069d | 157 | LWIP_DEBUGF(SYS_DEBUG, ("ssw h=%p(%p)\n", (void*)&h, (void *)arg)); |
screamer | 0:7a64fbb4069d | 158 | h(arg); |
screamer | 0:7a64fbb4069d | 159 | } |
screamer | 0:7a64fbb4069d | 160 | |
screamer | 0:7a64fbb4069d | 161 | /* We try again to fetch a message from the mbox. */ |
screamer | 0:7a64fbb4069d | 162 | goto again; |
screamer | 0:7a64fbb4069d | 163 | } else { |
screamer | 0:7a64fbb4069d | 164 | /* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout |
screamer | 0:7a64fbb4069d | 165 | occured. The time variable is set to the number of |
screamer | 0:7a64fbb4069d | 166 | milliseconds we waited for the message. */ |
screamer | 0:7a64fbb4069d | 167 | if (time_needed < timeouts->next->time) { |
screamer | 0:7a64fbb4069d | 168 | timeouts->next->time -= time_needed; |
screamer | 0:7a64fbb4069d | 169 | } else { |
screamer | 0:7a64fbb4069d | 170 | timeouts->next->time = 0; |
screamer | 0:7a64fbb4069d | 171 | } |
screamer | 0:7a64fbb4069d | 172 | } |
screamer | 0:7a64fbb4069d | 173 | } |
screamer | 0:7a64fbb4069d | 174 | } |
screamer | 0:7a64fbb4069d | 175 | |
screamer | 0:7a64fbb4069d | 176 | /** |
screamer | 0:7a64fbb4069d | 177 | * Create a one-shot timer (aka timeout). Timeouts are processed in the |
screamer | 0:7a64fbb4069d | 178 | * following cases: |
screamer | 0:7a64fbb4069d | 179 | * - while waiting for a message using sys_mbox_fetch() |
screamer | 0:7a64fbb4069d | 180 | * - while waiting for a semaphore using sys_sem_wait() or sys_sem_wait_timeout() |
screamer | 0:7a64fbb4069d | 181 | * - while sleeping using the inbuilt sys_msleep() |
screamer | 0:7a64fbb4069d | 182 | * |
screamer | 0:7a64fbb4069d | 183 | * @param msecs time in milliseconds after that the timer should expire |
screamer | 0:7a64fbb4069d | 184 | * @param h callback function to call when msecs have elapsed |
screamer | 0:7a64fbb4069d | 185 | * @param arg argument to pass to the callback function |
screamer | 0:7a64fbb4069d | 186 | */ |
screamer | 0:7a64fbb4069d | 187 | void |
screamer | 0:7a64fbb4069d | 188 | sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg) |
screamer | 0:7a64fbb4069d | 189 | { |
screamer | 0:7a64fbb4069d | 190 | struct sys_timeouts *timeouts; |
screamer | 0:7a64fbb4069d | 191 | struct sys_timeo *timeout, *t; |
screamer | 0:7a64fbb4069d | 192 | |
screamer | 0:7a64fbb4069d | 193 | timeout = memp_malloc(MEMP_SYS_TIMEOUT); |
screamer | 0:7a64fbb4069d | 194 | if (timeout == NULL) { |
screamer | 0:7a64fbb4069d | 195 | LWIP_ASSERT("sys_timeout: timeout != NULL", timeout != NULL); |
screamer | 0:7a64fbb4069d | 196 | return; |
screamer | 0:7a64fbb4069d | 197 | } |
screamer | 0:7a64fbb4069d | 198 | timeout->next = NULL; |
screamer | 0:7a64fbb4069d | 199 | timeout->h = h; |
screamer | 0:7a64fbb4069d | 200 | timeout->arg = arg; |
screamer | 0:7a64fbb4069d | 201 | timeout->time = msecs; |
screamer | 0:7a64fbb4069d | 202 | |
screamer | 0:7a64fbb4069d | 203 | timeouts = sys_arch_timeouts(); |
screamer | 0:7a64fbb4069d | 204 | |
screamer | 0:7a64fbb4069d | 205 | LWIP_DEBUGF(SYS_DEBUG, ("sys_timeout: %p msecs=%"U32_F" h=%p arg=%p\n", |
screamer | 0:7a64fbb4069d | 206 | (void *)timeout, msecs, (void*)&h, (void *)arg)); |
screamer | 0:7a64fbb4069d | 207 | |
screamer | 0:7a64fbb4069d | 208 | if (timeouts == NULL) { |
screamer | 0:7a64fbb4069d | 209 | LWIP_ASSERT("sys_timeout: timeouts != NULL", timeouts != NULL); |
screamer | 0:7a64fbb4069d | 210 | return; |
screamer | 0:7a64fbb4069d | 211 | } |
screamer | 0:7a64fbb4069d | 212 | |
screamer | 0:7a64fbb4069d | 213 | if (timeouts->next == NULL) { |
screamer | 0:7a64fbb4069d | 214 | timeouts->next = timeout; |
screamer | 0:7a64fbb4069d | 215 | return; |
screamer | 0:7a64fbb4069d | 216 | } |
screamer | 0:7a64fbb4069d | 217 | |
screamer | 0:7a64fbb4069d | 218 | if (timeouts->next->time > msecs) { |
screamer | 0:7a64fbb4069d | 219 | timeouts->next->time -= msecs; |
screamer | 0:7a64fbb4069d | 220 | timeout->next = timeouts->next; |
screamer | 0:7a64fbb4069d | 221 | timeouts->next = timeout; |
screamer | 0:7a64fbb4069d | 222 | } else { |
screamer | 0:7a64fbb4069d | 223 | for(t = timeouts->next; t != NULL; t = t->next) { |
screamer | 0:7a64fbb4069d | 224 | timeout->time -= t->time; |
screamer | 0:7a64fbb4069d | 225 | if (t->next == NULL || t->next->time > timeout->time) { |
screamer | 0:7a64fbb4069d | 226 | if (t->next != NULL) { |
screamer | 0:7a64fbb4069d | 227 | t->next->time -= timeout->time; |
screamer | 0:7a64fbb4069d | 228 | } |
screamer | 0:7a64fbb4069d | 229 | timeout->next = t->next; |
screamer | 0:7a64fbb4069d | 230 | t->next = timeout; |
screamer | 0:7a64fbb4069d | 231 | break; |
screamer | 0:7a64fbb4069d | 232 | } |
screamer | 0:7a64fbb4069d | 233 | } |
screamer | 0:7a64fbb4069d | 234 | } |
screamer | 0:7a64fbb4069d | 235 | } |
screamer | 0:7a64fbb4069d | 236 | |
screamer | 0:7a64fbb4069d | 237 | /** |
screamer | 0:7a64fbb4069d | 238 | * Go through timeout list (for this task only) and remove the first matching |
screamer | 0:7a64fbb4069d | 239 | * entry, even though the timeout has not triggered yet. |
screamer | 0:7a64fbb4069d | 240 | * |
screamer | 0:7a64fbb4069d | 241 | * @note This function only works as expected if there is only one timeout |
screamer | 0:7a64fbb4069d | 242 | * calling 'h' in the list of timeouts. |
screamer | 0:7a64fbb4069d | 243 | * |
screamer | 0:7a64fbb4069d | 244 | * @param h callback function that would be called by the timeout |
screamer | 0:7a64fbb4069d | 245 | * @param arg callback argument that would be passed to h |
screamer | 0:7a64fbb4069d | 246 | */ |
screamer | 0:7a64fbb4069d | 247 | void |
screamer | 0:7a64fbb4069d | 248 | sys_untimeout(sys_timeout_handler h, void *arg) |
screamer | 0:7a64fbb4069d | 249 | { |
screamer | 0:7a64fbb4069d | 250 | struct sys_timeouts *timeouts; |
screamer | 0:7a64fbb4069d | 251 | struct sys_timeo *prev_t, *t; |
screamer | 0:7a64fbb4069d | 252 | |
screamer | 0:7a64fbb4069d | 253 | timeouts = sys_arch_timeouts(); |
screamer | 0:7a64fbb4069d | 254 | |
screamer | 0:7a64fbb4069d | 255 | if (timeouts == NULL) { |
screamer | 0:7a64fbb4069d | 256 | LWIP_ASSERT("sys_untimeout: timeouts != NULL", timeouts != NULL); |
screamer | 0:7a64fbb4069d | 257 | return; |
screamer | 0:7a64fbb4069d | 258 | } |
screamer | 0:7a64fbb4069d | 259 | if (timeouts->next == NULL) { |
screamer | 0:7a64fbb4069d | 260 | return; |
screamer | 0:7a64fbb4069d | 261 | } |
screamer | 0:7a64fbb4069d | 262 | |
screamer | 0:7a64fbb4069d | 263 | for (t = timeouts->next, prev_t = NULL; t != NULL; prev_t = t, t = t->next) { |
screamer | 0:7a64fbb4069d | 264 | if ((t->h == h) && (t->arg == arg)) { |
screamer | 0:7a64fbb4069d | 265 | /* We have a match */ |
screamer | 0:7a64fbb4069d | 266 | /* Unlink from previous in list */ |
screamer | 0:7a64fbb4069d | 267 | if (prev_t == NULL) |
screamer | 0:7a64fbb4069d | 268 | timeouts->next = t->next; |
screamer | 0:7a64fbb4069d | 269 | else |
screamer | 0:7a64fbb4069d | 270 | prev_t->next = t->next; |
screamer | 0:7a64fbb4069d | 271 | /* If not the last one, add time of this one back to next */ |
screamer | 0:7a64fbb4069d | 272 | if (t->next != NULL) |
screamer | 0:7a64fbb4069d | 273 | t->next->time += t->time; |
screamer | 0:7a64fbb4069d | 274 | memp_free(MEMP_SYS_TIMEOUT, t); |
screamer | 0:7a64fbb4069d | 275 | return; |
screamer | 0:7a64fbb4069d | 276 | } |
screamer | 0:7a64fbb4069d | 277 | } |
screamer | 0:7a64fbb4069d | 278 | return; |
screamer | 0:7a64fbb4069d | 279 | } |
screamer | 0:7a64fbb4069d | 280 | |
screamer | 0:7a64fbb4069d | 281 | /** |
screamer | 0:7a64fbb4069d | 282 | * Timeout handler function for sys_sem_wait_timeout() |
screamer | 0:7a64fbb4069d | 283 | * |
screamer | 0:7a64fbb4069d | 284 | * @param arg struct sswt_cb* used to signal a semaphore and end waiting. |
screamer | 0:7a64fbb4069d | 285 | */ |
screamer | 0:7a64fbb4069d | 286 | static void |
screamer | 0:7a64fbb4069d | 287 | sswt_handler(void *arg) |
screamer | 0:7a64fbb4069d | 288 | { |
screamer | 0:7a64fbb4069d | 289 | struct sswt_cb *sswt_cb = (struct sswt_cb *) arg; |
screamer | 0:7a64fbb4069d | 290 | |
screamer | 0:7a64fbb4069d | 291 | /* Timeout. Set flag to TRUE and signal semaphore */ |
screamer | 0:7a64fbb4069d | 292 | sswt_cb->timeflag = 1; |
screamer | 0:7a64fbb4069d | 293 | sys_sem_signal(*(sswt_cb->psem)); |
screamer | 0:7a64fbb4069d | 294 | } |
screamer | 0:7a64fbb4069d | 295 | |
screamer | 0:7a64fbb4069d | 296 | /** |
screamer | 0:7a64fbb4069d | 297 | * Wait for a semaphore with timeout (specified in ms) |
screamer | 0:7a64fbb4069d | 298 | * |
screamer | 0:7a64fbb4069d | 299 | * @param sem semaphore to wait |
screamer | 0:7a64fbb4069d | 300 | * @param timeout timeout in ms (0: wait forever) |
screamer | 0:7a64fbb4069d | 301 | * @return 0 on timeout, 1 otherwise |
screamer | 0:7a64fbb4069d | 302 | */ |
screamer | 0:7a64fbb4069d | 303 | int |
screamer | 0:7a64fbb4069d | 304 | sys_sem_wait_timeout(sys_sem_t sem, u32_t timeout) |
screamer | 0:7a64fbb4069d | 305 | { |
screamer | 0:7a64fbb4069d | 306 | struct sswt_cb sswt_cb; |
screamer | 0:7a64fbb4069d | 307 | |
screamer | 0:7a64fbb4069d | 308 | sswt_cb.psem = &sem; |
screamer | 0:7a64fbb4069d | 309 | sswt_cb.timeflag = 0; |
screamer | 0:7a64fbb4069d | 310 | |
screamer | 0:7a64fbb4069d | 311 | /* If timeout is zero, then just wait forever */ |
screamer | 0:7a64fbb4069d | 312 | if (timeout > 0) { |
screamer | 0:7a64fbb4069d | 313 | /* Create a timer and pass it the address of our flag */ |
screamer | 0:7a64fbb4069d | 314 | sys_timeout(timeout, sswt_handler, &sswt_cb); |
screamer | 0:7a64fbb4069d | 315 | } |
screamer | 0:7a64fbb4069d | 316 | sys_sem_wait(sem); |
screamer | 0:7a64fbb4069d | 317 | /* Was it a timeout? */ |
screamer | 0:7a64fbb4069d | 318 | if (sswt_cb.timeflag) { |
screamer | 0:7a64fbb4069d | 319 | /* timeout */ |
screamer | 0:7a64fbb4069d | 320 | return 0; |
screamer | 0:7a64fbb4069d | 321 | } else { |
screamer | 0:7a64fbb4069d | 322 | /* Not a timeout. Remove timeout entry */ |
screamer | 0:7a64fbb4069d | 323 | sys_untimeout(sswt_handler, &sswt_cb); |
screamer | 0:7a64fbb4069d | 324 | return 1; |
screamer | 0:7a64fbb4069d | 325 | } |
screamer | 0:7a64fbb4069d | 326 | } |
screamer | 0:7a64fbb4069d | 327 | |
screamer | 0:7a64fbb4069d | 328 | /** |
screamer | 0:7a64fbb4069d | 329 | * Sleep for some ms. Timeouts are processed while sleeping. |
screamer | 0:7a64fbb4069d | 330 | * |
screamer | 0:7a64fbb4069d | 331 | * @param ms number of milliseconds to sleep |
screamer | 0:7a64fbb4069d | 332 | */ |
screamer | 0:7a64fbb4069d | 333 | void |
screamer | 0:7a64fbb4069d | 334 | sys_msleep(u32_t ms) |
screamer | 0:7a64fbb4069d | 335 | { |
screamer | 0:7a64fbb4069d | 336 | sys_sem_t delaysem = sys_sem_new(0); |
screamer | 0:7a64fbb4069d | 337 | |
screamer | 0:7a64fbb4069d | 338 | sys_sem_wait_timeout(delaysem, ms); |
screamer | 0:7a64fbb4069d | 339 | |
screamer | 0:7a64fbb4069d | 340 | sys_sem_free(delaysem); |
screamer | 0:7a64fbb4069d | 341 | } |
screamer | 0:7a64fbb4069d | 342 | |
screamer | 0:7a64fbb4069d | 343 | |
screamer | 0:7a64fbb4069d | 344 | #endif /* NO_SYS */ |