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Made lwip timeout measurements accurate by no longer returning 1 millisecond

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whenever sys_arch_mbox_wait() and sys_arch_sem_wait() get a message or
semaphore immediately. Updated documentation for this change.
Unix port and Coldfire port have been updated.
This commit is contained in:
davidhaas 2003-03-28 20:46:40 +00:00
parent c4ff244c4e
commit 2e0829fb5a
2 changed files with 18 additions and 21 deletions
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19
doc/sys_arch.txt
View File

@ -1,4 +1,4 @@
sys_arch interface for lwIP 0.5
sys_arch interface for lwIP 0.6++
Author: Adam Dunkels
@ -60,15 +60,11 @@ The following functions must be implemented by the sys_arch:
only be blocked for the specified time (measured in
milliseconds).
If the timeout argument is non-zero, the return value is the amount
of time spent waiting for the semaphore to be signaled. If the
semaphore wasn't signaled within the specified time, the return
value is zero. If the thread didn't have to wait for the semaphore
(i.e., it was already signaled), care must be taken to ensure that
the function does not return a zero value since this is used to
indicate that a timeout occured. A suitable way to implement this is
to check if the time spent waiting is zero and if so, the value 1 is
returned.
If the timeout argument is non-zero, the return value is the number of
milliseconds spent waiting for the semaphore to be signaled. If the
semaphore wasn't signaled within the specified time, the return value is
0xffffffff. If the thread didn't have to wait for the semaphore (i.e., it
was already signaled), the function may return zero.
Notice that lwIP implements a function with a similar name,
sys_sem_wait(), that uses the sys_arch_sem_wait() function.
@ -124,7 +120,8 @@ to be implemented as well:
Starts a new thread with priority "prio" that will begin its execution in the
function "thread()". The "arg" argument will be passed as an argument to the
thread() function. The id of the new thread is returned.
thread() function. The id of the new thread is returned. Both the id and
the priority are system dependent.
- sys_prot_t sys_arch_protect(void)

20
src/core/sys.c
View File

@ -64,11 +64,11 @@ sys_mbox_fetch(sys_mbox_t mbox, void **msg)
if(timeouts->next->time > 0) {
time = sys_arch_mbox_fetch(mbox, msg, timeouts->next->time);
} else {
time = 0;
time = 0xffffffff;
}
if(time == 0) {
/* If time == 0, a timeout occured before a message could be
if(time == 0xffffffff) {
/* If time == 0xffffffff, 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;
@ -84,9 +84,9 @@ sys_mbox_fetch(sys_mbox_t mbox, void **msg)
/* We try again to fetch a message from the mbox. */
goto again;
} else {
/* If time > 0, a message was received before the timeout
/* If time != 0xffffffff, a message was received before the timeout
occured. The time variable is set to the number of
microseconds we waited for the message. */
milliseconds we waited for the message. */
if(time <= timeouts->next->time) {
timeouts->next->time -= time;
} else {
@ -119,11 +119,11 @@ sys_sem_wait(sys_sem_t sem)
if(timeouts->next->time > 0) {
time = sys_arch_sem_wait(sem, timeouts->next->time);
} else {
time = 0;
time = 0xffffffff;
}
if(time == 0) {
/* If time == 0, a timeout occured before a message could be
if(time == 0xffffffff) {
/* If time == 0xffffffff, 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;
@ -140,9 +140,9 @@ sys_sem_wait(sys_sem_t sem)
/* We try again to fetch a message from the mbox. */
goto again;
} else {
/* If time > 0, a message was received before the timeout
/* If time != 0xffffffff, a message was received before the timeout
occured. The time variable is set to the number of
microseconds we waited for the message. */
milliseconds we waited for the message. */
if(time <= timeouts->next->time) {
timeouts->next->time -= time;
} else {