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Character device synchronization with network interface
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Character device synchronization with network interface


  • Subject: Character device synchronization with network interface
  • From: "Jamie Wood" <email@hidden>
  • Date: Wed, 03 Nov 2004 12:11:30 -0800

Hi,

I have a network interface driver that passes information to user space via a character device file in /dev. I need to provide some sort of synchronization between the code which services the read/write system calls and the code that accepts and sends network packets from the IP stack.

I've been poking around in the Apple documentation, but am still a little confused. In the syscall service code, do I simply need to use thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL) and vice versa to keep the networking code from accessing the driver's shared data structures? Based on what http://www.usenix.org/publications/library/proceedings/bsdcon02/full_papers/gerbarg/gerbarg_html/ says, this doesn't sound like it will be enough, and only helps in SMP situations. However, that seems to be what other drivers are doing (namely, the PPP driver).

Do I need to use a mutex in addition to thread_funnel_switch()? Performance is critical to me, so I would like to avoid using any unnecessary locks.

Any clarification would be greatly appreciated.

Thanks,
Jamie


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