userspace/libwr and doc: add shared memory support
This is the new IPC mechanism (not RPC) to pass port status and other status-like information among processes, to avoid lenghty RPC calls. Each WR process has 32k of shared space. Thanks to Adam for some fixes. Signed-off-by: Alessandro Rubini <rubini@gnudd.com> Signed-off-by: Adam Wujek <adam.wujek@cern.ch>
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userspace/libwr/shmem.c
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