Ensure fdtable seq is assigned atomically#329
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When two threads concurrently invoke the socket function, the absence of lock protection in citp_fdinfo_init may occasionally result in identical sequence numbers being assigned. Use __sync_fetch_and_add to guarantee atomicity.
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When two threads concurrently invoke the socket function, the absence of
lock protection in citp_fdinfo_init may occasionally result in identical
sequence numbers (seq) being assigned to different fdi entries.
This change replaces the non-atomic increment with __sync_fetch_and_add
to guarantee uniqueness of seq in a multi-threaded environment.