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[lwip-devel] [bug #19167] tcp timeout handler can cause crash being invo
From: |
Dmitry Potapov |
Subject: |
[lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait() |
Date: |
Wed, 28 Feb 2007 11:45:20 +0000 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.10) Gecko/20070216 Firefox/1.5.0.10 |
Follow-up Comment #4, bug #19167 (project lwip):
Using of timestamps instead of time-delta does NOT require 64-bit.
/* timestamp_t value in milliseconds taken by module 2^32,
so after 0xFFFFFFFF should be 0. */
typedef u32_t timestamp_t;
typedef s32_t timediff_t;
Now we need to define TIMESTAMP_DIFF macro that calculates the difference
between two timestamp_t values taken into account overflow and return it as
timediff_t, and TIMESTAMP_ADD which adds some timeout value to the given
timestamp.
Practically all modern processors use two's complement to represent signed
integers. So you can define them as
#define TIMESTAMP_DIFF(t1, t2) ((timediff_t)((t1) - (t2)))
#define TIMESTAMP_ADD(timestamp, timeout) \
((timestamp_t)((timestamp)+(timeout)))
then you can write
timediff_t timeout = TIMESTAMP_DIFF(timeouts->next->expires,
sys_time_now());
if (timeout > 0)
sys_arch_mbox_fetch(mbox, msg, timeout)
else
timeout_handler();
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- [lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait(), Dmitry Potapov, 2007/02/27
- [lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait(), goldsimon, 2007/02/28
- [lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait(), Andreas Becker, 2007/02/28
- [lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait(), goldsimon, 2007/02/28
- [lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait(),
Dmitry Potapov <=
- [lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait(), Andreas Becker, 2007/02/28
- [lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait(), Dmitry Potapov, 2007/02/28
- [lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait(), Andreas Becker, 2007/02/28
- [lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait(), Dmitry Potapov, 2007/02/28
- [lwip-devel] [bug #19167] tcp timeout handler can cause crash being invoked by sys_sem_wait(), Dmitry Potapov, 2007/02/28