On Thu, 2005-01-06 at 12:47 -0700, Stephen J. Smoogen wrote: > I am working with the libpcap + ringbuffer and trying to get it moved > from Debian to Red Hat. The Debian/Slackware code depends upon > /usr/include/linux/system.h which has the kernel version of asm.h > linked to if for the platform. For i386 this is asm-i386.h which has > the macro mb(); that the pcap ringbuffer code relies on to make sure > some obscure race conditions are taken of. [I do not know what the > race condition is beyond it talking to the kernel half of the > ringbuffer.] fix the app. mb() is not an exported feature from the kernel (headers) to userspace, the way the kernel implements that is *INTERNAL* and may be privileged to ring 0. Applications need to do their own barriers, and I suspect glibc provides functionality for this.
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