3 * Sequential API Main thread module
8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
11 * Redistribution and use in source and binary forms, with or without modification,
12 * are permitted provided that the following conditions are met:
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright notice,
17 * this list of conditions and the following disclaimer in the documentation
18 * and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
33 * This file is part of the lwIP TCP/IP stack.
35 * Author: Adam Dunkels <adam@sics.se>
41 #if !NO_SYS /* don't build if not configured for use in lwipopts.h */
44 #include "lwip/memp.h"
46 #include "lwip/pbuf.h"
47 #include "lwip/tcpip.h"
48 #include "lwip/init.h"
49 #include "netif/etharp.h"
50 #include "netif/ppp_oe.h"
52 /* global variables */
53 static tcpip_init_done_fn tcpip_init_done;
54 static void *tcpip_init_done_arg;
55 static sys_mbox_t mbox;
57 #if LWIP_TCPIP_CORE_LOCKING
58 /** The global semaphore to lock the stack. */
59 sys_mutex_t lock_tcpip_core;
60 #endif /* LWIP_TCPIP_CORE_LOCKING */
64 * The main lwIP thread. This thread has exclusive access to lwIP core functions
65 * (unless access to them is not locked). Other threads communicate with this
66 * thread using message boxes.
68 * It also starts all the timers to make sure they are running in the right
71 * @param arg unused argument
74 tcpip_thread(void *arg)
76 struct tcpip_msg *msg;
79 if (tcpip_init_done != NULL) {
80 tcpip_init_done(tcpip_init_done_arg);
84 while (1) { /* MAIN Loop */
86 /* wait for a message, timeouts are processed while waiting */
87 sys_timeouts_mbox_fetch(&mbox, (void **)&msg);
92 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API message %p\n", (void *)msg));
93 msg->msg.apimsg->function(&(msg->msg.apimsg->msg));
95 #endif /* LWIP_NETCONN */
98 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: PACKET %p\n", (void *)msg));
100 if (msg->msg.inp.netif->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
101 ethernet_input(msg->msg.inp.p, msg->msg.inp.netif);
103 #endif /* LWIP_ETHERNET */
104 { ip_input(msg->msg.inp.p, msg->msg.inp.netif);
106 memp_free(MEMP_TCPIP_MSG_INPKT, msg);
110 case TCPIP_MSG_NETIFAPI:
111 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: Netif API message %p\n", (void *)msg));
112 msg->msg.netifapimsg->function(&(msg->msg.netifapimsg->msg));
114 #endif /* LWIP_NETIF_API */
116 case TCPIP_MSG_CALLBACK:
117 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK %p\n", (void *)msg));
118 msg->msg.cb.function(msg->msg.cb.ctx);
119 memp_free(MEMP_TCPIP_MSG_API, msg);
122 case TCPIP_MSG_TIMEOUT:
123 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: TIMEOUT %p\n", (void *)msg));
124 sys_timeout(msg->msg.tmo.msecs, msg->msg.tmo.h, msg->msg.tmo.arg);
125 memp_free(MEMP_TCPIP_MSG_API, msg);
127 case TCPIP_MSG_UNTIMEOUT:
128 LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: UNTIMEOUT %p\n", (void *)msg));
129 sys_untimeout(msg->msg.tmo.h, msg->msg.tmo.arg);
130 memp_free(MEMP_TCPIP_MSG_API, msg);
140 * Pass a received packet to tcpip_thread for input processing
142 * @param p the received packet, p->payload pointing to the Ethernet header or
143 * to an IP header (if inp doesn't have NETIF_FLAG_ETHARP or
144 * NETIF_FLAG_ETHERNET flags)
145 * @param inp the network interface on which the packet was received
148 tcpip_input(struct pbuf *p, struct netif *inp)
150 struct tcpip_msg *msg;
152 if (sys_mbox_valid(&mbox)) {
153 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_INPKT);
158 msg->type = TCPIP_MSG_INPKT;
160 msg->msg.inp.netif = inp;
161 if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
162 memp_free(MEMP_TCPIP_MSG_INPKT, msg);
171 * Call a specific function in the thread context of
172 * tcpip_thread for easy access synchronization.
173 * A function called in that way may access lwIP core code
174 * without fearing concurrent access.
176 * @param f the function to call
177 * @param ctx parameter passed to f
178 * @param block 1 to block until the request is posted, 0 to non-blocking mode
179 * @return ERR_OK if the function was called, another err_t if not
182 tcpip_callback_with_block(tcpip_callback_fn function, void *ctx, u8_t block)
184 struct tcpip_msg *msg;
186 if (sys_mbox_valid(&mbox)) {
187 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
192 msg->type = TCPIP_MSG_CALLBACK;
193 msg->msg.cb.function = function;
194 msg->msg.cb.ctx = ctx;
196 sys_mbox_post(&mbox, msg);
198 if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
199 memp_free(MEMP_TCPIP_MSG_API, msg);
209 * call sys_timeout in tcpip_thread
211 * @param msec time in miliseconds for timeout
212 * @param h function to be called on timeout
213 * @param arg argument to pass to timeout function h
214 * @return ERR_MEM on memory error, ERR_OK otherwise
217 tcpip_timeout(u32_t msecs, sys_timeout_handler h, void *arg)
219 struct tcpip_msg *msg;
221 if (sys_mbox_valid(&mbox)) {
222 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
227 msg->type = TCPIP_MSG_TIMEOUT;
228 msg->msg.tmo.msecs = msecs;
230 msg->msg.tmo.arg = arg;
231 sys_mbox_post(&mbox, msg);
238 * call sys_untimeout in tcpip_thread
240 * @param msec time in miliseconds for timeout
241 * @param h function to be called on timeout
242 * @param arg argument to pass to timeout function h
243 * @return ERR_MEM on memory error, ERR_OK otherwise
246 tcpip_untimeout(sys_timeout_handler h, void *arg)
248 struct tcpip_msg *msg;
250 if (sys_mbox_valid(&mbox)) {
251 msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
256 msg->type = TCPIP_MSG_UNTIMEOUT;
258 msg->msg.tmo.arg = arg;
259 sys_mbox_post(&mbox, msg);
267 * Call the lower part of a netconn_* function
268 * This function is then running in the thread context
269 * of tcpip_thread and has exclusive access to lwIP core code.
271 * @param apimsg a struct containing the function to call and its parameters
272 * @return ERR_OK if the function was called, another err_t if not
275 tcpip_apimsg(struct api_msg *apimsg)
277 struct tcpip_msg msg;
279 /* catch functions that don't set err */
280 apimsg->msg.err = ERR_VAL;
283 if (sys_mbox_valid(&mbox)) {
284 msg.type = TCPIP_MSG_API;
285 msg.msg.apimsg = apimsg;
286 sys_mbox_post(&mbox, &msg);
287 sys_arch_sem_wait(&apimsg->msg.conn->op_completed, 0);
288 return apimsg->msg.err;
293 #if LWIP_TCPIP_CORE_LOCKING
295 * Call the lower part of a netconn_* function
296 * This function has exclusive access to lwIP core code by locking it
297 * before the function is called.
299 * @param apimsg a struct containing the function to call and its parameters
300 * @return ERR_OK (only for compatibility fo tcpip_apimsg())
303 tcpip_apimsg_lock(struct api_msg *apimsg)
306 /* catch functions that don't set err */
307 apimsg->msg.err = ERR_VAL;
311 apimsg->function(&(apimsg->msg));
313 return apimsg->msg.err;
316 #endif /* LWIP_TCPIP_CORE_LOCKING */
317 #endif /* LWIP_NETCONN */
320 #if !LWIP_TCPIP_CORE_LOCKING
322 * Much like tcpip_apimsg, but calls the lower part of a netifapi_*
325 * @param netifapimsg a struct containing the function to call and its parameters
326 * @return error code given back by the function that was called
329 tcpip_netifapi(struct netifapi_msg* netifapimsg)
331 struct tcpip_msg msg;
333 if (sys_mbox_valid(&mbox)) {
334 err_t err = sys_sem_new(&netifapimsg->msg.sem, 0);
336 netifapimsg->msg.err = err;
340 msg.type = TCPIP_MSG_NETIFAPI;
341 msg.msg.netifapimsg = netifapimsg;
342 sys_mbox_post(&mbox, &msg);
343 sys_sem_wait(&netifapimsg->msg.sem);
344 sys_sem_free(&netifapimsg->msg.sem);
345 return netifapimsg->msg.err;
349 #else /* !LWIP_TCPIP_CORE_LOCKING */
351 * Call the lower part of a netifapi_* function
352 * This function has exclusive access to lwIP core code by locking it
353 * before the function is called.
355 * @param netifapimsg a struct containing the function to call and its parameters
356 * @return ERR_OK (only for compatibility fo tcpip_netifapi())
359 tcpip_netifapi_lock(struct netifapi_msg* netifapimsg)
362 netifapimsg->function(&(netifapimsg->msg));
364 return netifapimsg->msg.err;
366 #endif /* !LWIP_TCPIP_CORE_LOCKING */
367 #endif /* LWIP_NETIF_API */
370 * Initialize this module:
371 * - initialize all sub modules
372 * - start the tcpip_thread
374 * @param initfunc a function to call when tcpip_thread is running and finished initializing
375 * @param arg argument to pass to initfunc
378 tcpip_init(tcpip_init_done_fn initfunc, void *arg)
382 tcpip_init_done = initfunc;
383 tcpip_init_done_arg = arg;
384 if(sys_mbox_new(&mbox, TCPIP_MBOX_SIZE) != ERR_OK) {
385 LWIP_ASSERT("failed to create tcpip_thread mbox", 0);
387 #if LWIP_TCPIP_CORE_LOCKING
388 if(sys_mutex_new(&lock_tcpip_core) != ERR_OK) {
389 LWIP_ASSERT("failed to create lock_tcpip_core", 0);
391 #endif /* LWIP_TCPIP_CORE_LOCKING */
393 sys_thread_new(TCPIP_THREAD_NAME, tcpip_thread, NULL, TCPIP_THREAD_STACKSIZE, TCPIP_THREAD_PRIO);
397 * Simple callback function used with tcpip_callback to free a pbuf
398 * (pbuf_free has a wrong signature for tcpip_callback)
400 * @param p The pbuf (chain) to be dereferenced.
403 pbuf_free_int(void *p)
405 struct pbuf *q = (struct pbuf *)p;
410 * A simple wrapper function that allows you to free a pbuf from interrupt context.
412 * @param p The pbuf (chain) to be dereferenced.
413 * @return ERR_OK if callback could be enqueued, an err_t if not
416 pbuf_free_callback(struct pbuf *p)
418 return tcpip_callback_with_block(pbuf_free_int, p, 0);
422 * A simple wrapper function that allows you to free heap memory from
425 * @param m the heap memory to free
426 * @return ERR_OK if callback could be enqueued, an err_t if not
429 mem_free_callback(void *m)
431 return tcpip_callback_with_block(mem_free, m, 0);