EBIKE-FreeRTOS/Common/ethernet/lwIP/core/sys.c

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2024-04-14 18:38:39 +08:00
/*
* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
*
*/
#include "lwip/sys.h"
#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/memp.h"
#if (NO_SYS == 0)
struct sswt_cb
{
s16_t timeflag;
sys_sem_t *psem;
};
void
sys_mbox_fetch(sys_mbox_t mbox, void **msg)
{
u32_t time;
struct sys_timeouts *timeouts;
struct sys_timeo *tmptimeout;
sys_timeout_handler h;
void *arg;
again:
timeouts = sys_arch_timeouts();
if (!timeouts || !timeouts->next) {
sys_arch_mbox_fetch(mbox, msg, 0);
} else {
if (timeouts->next->time > 0) {
time = sys_arch_mbox_fetch(mbox, msg, timeouts->next->time);
} else {
time = SYS_ARCH_TIMEOUT;
}
if (time == SYS_ARCH_TIMEOUT) {
/* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message
could be fetched. We should now call the timeout handler and
deallocate the memory allocated for the timeout. */
tmptimeout = timeouts->next;
timeouts->next = tmptimeout->next;
h = tmptimeout->h;
arg = tmptimeout->arg;
memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
if (h != NULL) {
LWIP_DEBUGF(SYS_DEBUG, ("smf calling h=%p(%p)\n", (void *)h, (void *)arg));
h(arg);
}
/* We try again to fetch a message from the mbox. */
goto again;
} else {
/* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout
occured. The time variable is set to the number of
milliseconds we waited for the message. */
if (time <= timeouts->next->time) {
timeouts->next->time -= time;
} else {
timeouts->next->time = 0;
}
}
}
}
void
sys_sem_wait(sys_sem_t sem)
{
u32_t time;
struct sys_timeouts *timeouts;
struct sys_timeo *tmptimeout;
sys_timeout_handler h;
void *arg;
/* while (sys_arch_sem_wait(sem, 1000) == 0);
return;*/
again:
timeouts = sys_arch_timeouts();
if (!timeouts || !timeouts->next) {
sys_arch_sem_wait(sem, 0);
} else {
if (timeouts->next->time > 0) {
time = sys_arch_sem_wait(sem, timeouts->next->time);
} else {
time = SYS_ARCH_TIMEOUT;
}
if (time == SYS_ARCH_TIMEOUT) {
/* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message
could be fetched. We should now call the timeout handler and
deallocate the memory allocated for the timeout. */
tmptimeout = timeouts->next;
timeouts->next = tmptimeout->next;
h = tmptimeout->h;
arg = tmptimeout->arg;
memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
if (h != NULL) {
LWIP_DEBUGF(SYS_DEBUG, ("ssw h=%p(%p)\n", (void *)h, (void *)arg));
h(arg);
}
/* We try again to fetch a message from the mbox. */
goto again;
} else {
/* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout
occured. The time variable is set to the number of
milliseconds we waited for the message. */
if (time <= timeouts->next->time) {
timeouts->next->time -= time;
} else {
timeouts->next->time = 0;
}
}
}
}
void
sys_timeout(u32_t msecs, sys_timeout_handler h, void *arg)
{
struct sys_timeouts *timeouts;
struct sys_timeo *timeout, *t;
timeout = memp_malloc(MEMP_SYS_TIMEOUT);
if (timeout == NULL) {
return;
}
timeout->next = NULL;
timeout->h = h;
timeout->arg = arg;
timeout->time = msecs;
timeouts = sys_arch_timeouts();
LWIP_DEBUGF(SYS_DEBUG, ("sys_timeout: %p msecs=%"U32_F" h=%p arg=%p\n",
(void *)timeout, msecs, (void *)h, (void *)arg));
LWIP_ASSERT("sys_timeout: timeouts != NULL", timeouts != NULL);
if (timeouts->next == NULL) {
timeouts->next = timeout;
return;
}
if (timeouts->next->time > msecs) {
timeouts->next->time -= msecs;
timeout->next = timeouts->next;
timeouts->next = timeout;
} else {
for(t = timeouts->next; t != NULL; t = t->next) {
timeout->time -= t->time;
if (t->next == NULL || t->next->time > timeout->time) {
if (t->next != NULL) {
t->next->time -= timeout->time;
}
timeout->next = t->next;
t->next = timeout;
break;
}
}
}
}
/* Go through timeout list (for this task only) and remove the first matching entry,
even though the timeout has not triggered yet.
*/
void
sys_untimeout(sys_timeout_handler h, void *arg)
{
struct sys_timeouts *timeouts;
struct sys_timeo *prev_t, *t;
timeouts = sys_arch_timeouts();
if (timeouts->next == NULL)
return;
for (t = timeouts->next, prev_t = NULL; t != NULL; prev_t = t, t = t->next)
{
if ((t->h == h) && (t->arg == arg))
{
/* We have a match */
/* Unlink from previous in list */
if (prev_t == NULL)
timeouts->next = t->next;
else
prev_t->next = t->next;
/* If not the last one, add time of this one back to next */
if (t->next != NULL)
t->next->time += t->time;
memp_free(MEMP_SYS_TIMEOUT, t);
return;
}
}
return;
}
static void
sswt_handler(void *arg)
{
struct sswt_cb *sswt_cb = (struct sswt_cb *) arg;
/* Timeout. Set flag to TRUE and signal semaphore */
sswt_cb->timeflag = 1;
sys_sem_signal(*(sswt_cb->psem));
}
/* Wait for a semaphore with timeout (specified in ms) */
/* timeout = 0: wait forever */
/* Returns 0 on timeout. 1 otherwise */
int
sys_sem_wait_timeout(sys_sem_t sem, u32_t timeout)
{
struct sswt_cb sswt_cb;
sswt_cb.psem = &sem;
sswt_cb.timeflag = 0;
/* If timeout is zero, then just wait forever */
if (timeout > 0)
/* Create a timer and pass it the address of our flag */
sys_timeout(timeout, sswt_handler, &sswt_cb);
sys_sem_wait(sem);
/* Was it a timeout? */
if (sswt_cb.timeflag)
{
/* timeout */
return 0;
} else {
/* Not a timeout. Remove timeout entry */
sys_untimeout(sswt_handler, &sswt_cb);
return 1;
}
}
void
sys_msleep(u32_t ms)
{
sys_sem_t delaysem = sys_sem_new(0);
sys_sem_wait_timeout(delaysem, ms);
sys_sem_free(delaysem);
}
#endif /* NO_SYS */