Semantics

1. The number of bytes actually extracted by FM_extract() is a "soft" upper bound. That means that FM_extract() may extract slightly more data length bytes of data, up to an implementation-specific constant.
2. FM_extract() executes in a thread-safe manner, i.e. no two threads will extract the same message.
3. Messages are extracted in FIFO order.(17)
4. FM_extract() need be called only when a process needs data from the network. Extracting infrequently will not necessarily block the sender (although it will, eventually, when FM runs out of internal buffer space).

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