Re: [lwip-users] Help,about pbuf_free

[Leon Woestenberg]

Hello,


On Fri, 2004-08-06 at 12:56, tao meng wrote:
> Hi,everyone:
>            when I run lwip0.7.2 + ucos_ii 2.70 on ADI-BF532,it shows that 
> "p->ref < = 0",but what make it happened,I have already use mutex as a lock 
> to protect the p->ref from being changed by others at the same time!And 
>
An interrupt can pre-empt the mutex lock.

So check your interrupt handler. If it runs in interrupt context you do
not have mutexes available (the call will probably fail without a lock
acquired).

Creating a late/deferred/bottom half/task based interrupt handler can
solve this; it must acquire the lock out of interrupt context.

Regards,

Leon.