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Channel half-closed states
| State | Closed local | Closed remote
|=============================================
| Read | Yes (until EOF) | No
| Write | No | Yes
Channels are considered fully closed when both outgoing and incoming
directions are closed and when the reader of the channel has read the
EOF marker
proc init(L: type LPChannel; id: uint64; conn: Connection; initiator: bool;
name: string = ""; timeout: Duration = DefaultChanTimeout): LPChannel {.
...raises: [].}
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method close(s: LPChannel) {.async, ...gcsafe, raises: [], tags: [], forbids: [].}
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Close channel for writing - a message will be sent to the other peer informing them that the channel is closed and that we're waiting for their acknowledgement.
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method readOnce(s: LPChannel; pbytes: pointer; nbytes: int): Future[int] {.
async, ...raises: [], tags: [RootEffect], forbids: [].}
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Mplex relies on reading being done regularly from every channel, or all channels are blocked - in particular, this means that reading from one channel must not be done from within a callback / read handler of another or the reads will lock each other.
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method write(s: LPChannel; msg: seq[byte]): Future[void] {....raises: [],
tags: [RootEffect], forbids: [].}
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Write to mplex channel - there may be up to MaxWrite concurrent writes pending after which the peer is disconnected
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