Messages in this thread | | | Date | Sun, 22 Feb 2004 16:12:53 +0100 | From | Manfred Spraul <> | Subject | Re: [RFC][PATCH] 2/6 POSIX message queues |
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Arnd wrote:
>Nothing difficult here, but slow and avoidable if you have the >structures laid out properly. > I thought about using s32 for the kernel mq_attr structure, and didn't like it: It would mean that 64-bit archs running native 64-bit apps must do a conversion - glibc must expose a structure with long values. Additionally, the posix message queue API uses 3 structures with long values, and only one of them is new - we'll need wrappers anyway. The actual values in the mq_attr structure would fit into s32: - mq_flags is 0 or O_NONBLOCK - mq_maxmsg is less than 32k (kmalloc'ed array of pointers) - mq_msgsize is theoretically unlimited, but the current implementation arbitrarily limits the value to 1 MB.
-- Manfred
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