does iptables is thread-safe???

[肖冰]

Hi,
        I am writing a linux  broadband access server .And I wan't to 
use multi thread in process iptables .Every thread have their handle
by iptc_init("filter"), and they use a semaphore to avoid reenter .
But when I start my programe,I get the same error message by iptc_strerror(errno),the 
error string is "Invalid or incomplete multibyte or wide character".

        Help me please!!!
    
    Thanks





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