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d5b7302ac0
Fixes a TOCTOU where the channel could be used between the call to
can_{recv,send} and {recv,send} causing an unexpected blocking
operation.
To do this we use the non-blocking try_{recv,send} and retry the check
in a loop. This guarantees non-blocking select behaviour, at the cost of
spinning if the input channels are highly contended.
Signed-off-by: Jack Mordaunt <jackmordaunt.dev@gmail.com>