Geoffrey McRae cc2c49644d [spice] reworked to avoid locking requirements on the input channel ...

POSIX `send` is thread safe, to take advantage of this the code has been
changed to construct a contiguous buffer and perform the send in a
single operation preventing any risk of a race condition.

Only the main channel still requires an interlock as the VD agent
requires multiple sends to transmit a full buffer.

2020-01-29 18:53:33 +11:00

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