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Partly apply patch from "Douglas" provided in bug #52748: the bug in timeouts.c

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- Fix sys_untimeout implementation should not modify timer values since we are now using absolute timeouts.c
- Cleanup and simplify sys_check_timeouts() implementation
- Implement sys_restart_timeouts to rebase all timeouts based on next timer to expire

Changes by me:
- Rename TIME_LESS_THAN to TIME_LESS_OR_EQUAL_THAN
This commit is contained in:
Dirk Ziegelmeier 2018-01-08 07:33:40 +01:00
parent eaca067c7d
commit a31f8837b5
1 changed files with 58 additions and 43 deletions
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75
src/core/timeouts.c
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@ -67,7 +67,7 @@
#endif /* LWIP_DEBUG_TIMERNAMES */
/* Check if timer's expiry time is greater than time and care about u32_t wraparounds */
#define TIME_LESS_THAN(t, compare_to) ( (((t) == (compare_to)) || (((u32_t)((t)-(compare_to))) > 0x7fffffff)) ? 1 : 0 )
#define TIME_LESS_OR_EQUAL_THAN(t, compare_to) ( (((t) == (compare_to)) || (((u32_t)((t)-(compare_to))) > 0x7fffffff)) ? 1 : 0 )
/** This array contains all stack-internal cyclic timers. To get the number of
* timers, use LWIP_ARRAYSIZE() */
@ -192,7 +192,7 @@ lwip_cyclic_timer(void *arg)
now = sys_now();
next_timeout = (u32_t)(current_timeout_due_time + cyclic->interval_ms);
if (TIME_LESS_THAN(next_timeout, now)) {
if (TIME_LESS_OR_EQUAL_THAN(next_timeout, now)) {
/* timer would immediately expire again -> "overload" -> restart without any correction */
sys_timeout(cyclic->interval_ms, lwip_cyclic_timer, arg);
} else {
@ -247,7 +247,7 @@ sys_timeout(u32_t msecs, sys_timeout_handler handler, void *arg)
timeout->next = NULL;
timeout->h = handler;
timeout->arg = arg;
timeout->time = (u32_t)(now + msecs); /* overflow handled by TIME_LESS_THAN macro */
timeout->time = (u32_t)(now + msecs); /* overflow handled by TIME_LESS_OR_EQUAL_THAN macro */
#if LWIP_DEBUG_TIMERNAMES
timeout->handler_name = handler_name;
LWIP_DEBUGF(TIMERS_DEBUG, ("sys_timeout: %p msecs=%"U32_F" handler=%s arg=%p\n",
@ -258,12 +258,12 @@ sys_timeout(u32_t msecs, sys_timeout_handler handler, void *arg)
next_timeout = timeout;
return;
}
if (TIME_LESS_THAN(timeout->time, next_timeout->time)) {
if (TIME_LESS_OR_EQUAL_THAN(timeout->time, next_timeout->time)) {
timeout->next = next_timeout;
next_timeout = timeout;
} else {
for (t = next_timeout; t != NULL; t = t->next) {
if ((t->next == NULL) || TIME_LESS_THAN(timeout->time, t->next->time)) {
if ((t->next == NULL) || TIME_LESS_OR_EQUAL_THAN(timeout->time, t->next->time)) {
timeout->next = t->next;
t->next = timeout;
break;
@ -300,10 +300,6 @@ sys_untimeout(sys_timeout_handler handler, void *arg)
} 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;
}
@ -325,31 +321,38 @@ static
void
sys_check_timeouts(void)
{
u32_t now;
LWIP_ASSERT_CORE_LOCKED();
if (next_timeout) {
/* Process only timers expired at the start of the function. */
now = sys_now();
do {
struct sys_timeo *tmptimeout;
sys_timeout_handler handler;
void *arg;
u8_t had_one;
u32_t now;
do {
PBUF_CHECK_FREE_OOSEQ();
had_one = 0;
tmptimeout = next_timeout;
now = sys_now();
if (tmptimeout && TIME_LESS_THAN(tmptimeout->time, now)) {
/* timeout has expired */
had_one = 1;
if (tmptimeout == NULL) {
return;
}
if (TIME_LESS_OR_EQUAL_THAN(now, tmptimeout->time)) {
return;
}
/* Timeout has expired */
next_timeout = tmptimeout->next;
handler = tmptimeout->h;
arg = tmptimeout->arg;
current_timeout_due_time = tmptimeout->time;
#if LWIP_DEBUG_TIMERNAMES
if (handler != NULL) {
LWIP_DEBUGF(TIMERS_DEBUG, ("sct calling h=%s arg=%p\n",
tmptimeout->handler_name, arg));
LWIP_DEBUGF(TIMERS_DEBUG, ("sct calling h=%s t=%"U32_F" arg=%p\n",
tmptimeout->handler_name, sys_now() - tmptimeout->time, arg));
}
#endif /* LWIP_DEBUG_TIMERNAMES */
memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
@ -357,21 +360,33 @@ sys_check_timeouts(void)
handler(arg);
}
LWIP_TCPIP_THREAD_ALIVE();
}
/* repeat until all expired timers have been called */
} while (had_one);
} else {
PBUF_CHECK_FREE_OOSEQ();
LWIP_TCPIP_THREAD_ALIVE();
}
/* Repeat until all expired timers have been called */
} while (1);
}
/**
* @deprecated Just delete your call to this function
/** Rebase the timeout times to the current time.
* This is necessary if sys_check_timeouts() hasn't been called for a long
* time (e.g. while saving energy) to prevent all timer functions of that
* period being called.
*/
void
sys_restart_timeouts(void)
{
u32_t now;
u32_t base;
struct sys_timeo *t;
if (next_timeout == NULL) {
return;
}
now = sys_now();
base = next_timeout->time;
for (t = next_timeout; t != NULL; t = t->next) {
t->time = (t->time - base) + now;
}
}
/** Return the time left before the next timeout is due. If no timeouts are
@ -391,7 +406,7 @@ sys_timeouts_sleeptime(void)
return 0xffffffff;
}
now = sys_now();
if (TIME_LESS_THAN(next_timeout->time, now)) {
if (TIME_LESS_OR_EQUAL_THAN(next_timeout->time, now)) {
return 0;
} else {
return (u32_t)(next_timeout->time - now);