receive-if ( pred -- message )
Message-passing concurrency » Sending and receiving messages

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Vocabulary
concurrency.messaging

Inputs

pred	a predicate with stack effect ( obj -- ? )

Outputs

message

an object

Word description
Return the first message from the current thread's mailbox that satisfies the predicate. To satisfy the predicate, pred is called with the item on the stack and the predicate should leave a boolean indicating whether it was satisfied or not. If nothing in the mailbox satisfies the predicate then the thread will block until something does.

See also
send, receive

Definition

USING: concurrency.mailboxes kernel ;

IN: concurrency.messaging

: receive-if ( pred -- message )
    [ my-mailbox ] dip mailbox-get? ?linked ; inline