netdev - write() udp socket

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Message-ID: <tencent_287F494544728EDB6DA9C8ED@qq.com>
Date:	Sat, 23 Jul 2011 17:29:33 +0800
From:	"ZHOU Xiaobo" <xb.zhou@...com>
To:	"netdev" <netdev@...r.kernel.org>
Subject: write() udp socket

question No1:
When I call 
ssize_t write(int fd, const void *buf, size_t count);


on a nonblocking UDP socket, is the return value  always equal to 'count'?


question No2:
Can I write() a UDP socket in multiple threads without locking?


thanks


------------------
Sincerely yours
                         ZHOU Xiaobo