How Does Go Distribute Data Across Multiple Receivers on a Single Channel?

Channel Behavior with Multiple Receivers

When using a single channel with multiple receiver goroutines, it becomes crucial to understand how data distribution occurs. While the channel itself becomes blocked until data is available, the behavior becomes more intricate once data is sent.

Data Distribution

Contrary to expectations, not all receivers receive the data simultaneously. Instead, a single receiver is randomly chosen to receive the data, and the blocking behavior ceases for that receiver only. This implies that the other receivers will remain blocked until more data is sent on the channel.

This unexpected behavior stems from the fact that Go uses a pseudo-random approach to select which receiver will receive the data. The language specification outlines that, of the possible communication operations, a single random one is chosen if they can all proceed. This pseudo-randomness ensures fairness among the receivers but makes the selection process non-deterministic.

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