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[lwip-devel] [bug #29769] sys_check_timeouts: sys_now() may overflow
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From: |
Iordan Neshev |
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Subject: |
[lwip-devel] [bug #29769] sys_check_timeouts: sys_now() may overflow |
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Date: |
Tue, 04 May 2010 13:39:19 +0000 |
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User-agent: |
Opera/9.80 (Windows NT 5.1; U; en) Presto/2.2.15 Version/10.00 |
Follow-up Comment #1, bug #29769 (project lwip):
I use the following macro:
#define TIMEDIFF(a,b) (((a) >= (b)) ? ((a)-(b)) :
(((a)+((b)^0xFFFFFFFF)+1)))
It's used like that:
time_diff = TIMEDIFF(sys_now(), last_time);
Seems to be the same as the proposed one and I can confirm it works (at least
on a 32-bit micro).
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