A channel both synchronizes a pair of threads and passes a value from one to the other. Channels are synchronous; both the sender and the receiver must block until the (atomic) transaction is complete. Multiple senders and receivers can access a channel at once, but a single sender and receiver is selected for each transaction.
Channel synchronization is fair: if a thread is blocked on a channel and transaction opportunities for the channel occur infinitely often, then the thread eventually participates in a transaction.
In addition to its use with channel-specific procedures, a channel can be used as a synchronizable event (see Events). A channel is ready for synchronization when channel-get would not block; the channel’s synchronization result is the same as the channel-get result.
For buffered asynchronous channels, see Buffered Asynchronous Channels.
Returns
#tif
vis a
channel,
#fotherwise.
Blocks until a sender is ready to provide a value through ch. The result is the sent value.
Receives and returns a value from ch if a sender is immediately ready, otherwise returns #f.
Blocks until a receiver is ready to accept the value v through ch.
Returns
#tif
vis a channel-put event produced by
channel-put-evt,
#fotherwise.
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