core/sync.try_select_raw: fix TOCTOU

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>

0 files changed, 0 insertions, 0 deletions