70 lines
24 KiB
Plaintext
70 lines
24 KiB
Plaintext
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rust
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7` #rustc 1.96.0 (ac68faa20 2026-05-25)ÁÀ뉊 ]!ÜÛê(¹Þ—šên -5be7b69c3ff7b5b8Á íàÄTËŸ ÜJîÄ)'ß\¥! -3d1337db07d0b3aeÁ ¤²XctÔ'ÐÓ©z¨É½Ó -a4945860e1c53b00Á ¤°ð ¾ä-±($²ï=©Ã -7e98a21bfd32b0edÁ–�òÖÀH•‘P IÓHã#£ -055f30b747f859b6Á rustc_std_workspace_coreÁCçß^ò½èÝ$Çÿ+Cé -c4878ee60b2242c9Á ŸÃï+Ñ]ŠqB<ÏïW# -8dd1dd90e70d0b6aÁ miniz_oxideÁ€š»J(P>àö÷g\K -1eb618da2918ab7fÁ adler2ÁÆ;+Þ®5¥ÌýÝ°¦ÛLˆ -f7919172d268e069Á hashbrownÁPäV9ÒÆèÜ�"ÊÖVŽ\ -0fc2184a5da6723aÁ rustc_std_workspace_allocÁs&ØòØy¯s•bæ!‰ýŠ -97e4bf30be240674Á
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std_detectÁhŠBîÙºÌI®Ë�Å�š -9dbbf8346ba7ac8bÁ rustc_demangleÁûë9´Ç×@Œ�’ùXFº -f33013f239bf9f14Á cfg_ifÁÜLh�ž§Œaã¯>� -0a71c8f33a838301Á addr2lineÁ׎Þ!]8V$É@@T· -e618e6be60e87ba2Á gimliÁ¸
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‹ás «LÖ€îâƒ×ɯŒ -ee6f3747e38367f0Á try_lockÁªÌGu·kÚxd²ƒÌ%ÛRü -248d9029c468ba3dÁ testsÁ,·_ ‚ $¬_ À
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æ GiverÁ innerÁ TakerÁ á ClosedÁ _innerÁ ÷ ÷ InnerÁ º taskÁ wantÁ poll_wantÁ giveÁ
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Š ¿cé Œ" ‚Ø|Â] 9 : % 9 9 :© <ˆ Q£‘0ý¹¥ \ ¬ f m 9:@DÀ × Ì ¤, FutureÁ4â ‚Ø í ó ë PinÁ † „¾ K š †J AtomicUsizeÁ\¶ „Ä ×4Ë ÅÀ × ÆÀ à $ã ýA ·$é œØ WakerÁ,ï ã�
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TryLockÁ<‡ 6 ü û� ü‰D A A Futures channel-like utility to signal when a value is wanted.Á Î ú üÒM J Futures are supposed to be lazy, and only starting work if `Future::poll`Á ü I F is called. The same is true of `Stream`s, but when using a channel asÁ üêL I a `Stream`, it can be hard to know if the receiver is ready for the nextÁ T· value.Á  ú üÆN K Put another way, given a `(tx, rx)` from `futures::sync::mpsc::channel()`,Á ü•O L how can the sender (`tx`) know when the receiver (`rx`) actually wants moreÁ üåI F work to be produced? Just because there is room in the channel bufferÁ ü¯8 5 doesn't mean the work would be used by the receiver.Á è ú üìM J This is where something like `want` comes in. Added to a channel, you canÁ üºO L make sure that the `tx` only creates the message and sends it when the `rx`Á üŠ2 / has `poll()` for it, and the buffer was empty.Á ½ ú lÁ
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# ExampleÁ Ï ú tÓ ```nightlyÁ üâ # //#![feature(async_await)]Á ´ƒ extern crate want;Á š ú Üž # fn spawn<T>(_t: T) {}Á üº1 . # fn we_still_want_message() -> bool { true }Á üì0 - # fn mpsc_channel() -> (Tx, Rx) { (Tx, Rx) }Á „�
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# struct Tx;Á ü® 0 - # impl Tx { fn send<T>(&mut self, _: T) {} }Á „ß
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# struct Rx;Á üð S P # impl Rx { async fn recv(&mut self) -> Option<Expensive> { Some(Expensive) } }Á Ä
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ú üÈ
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1 . // Some message that is expensive to produce.Á ¬ú
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struct Expensive;Á � ú ü” ) & // Some futures-aware MPSC channel...Á ü¾ * ' let (mut tx, mut rx) = mpsc_channel();Á é ú ôí // And our `want` channel!Á üŒ ' $ let (mut gv, mut tk) = want::new();Á ´ ú ¸ ú ä¼ // Our receiving task...Á ´Ù spawn(async move {Á üð > ; // Maybe something comes up that prevents us from everÁ ü¯
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' $ // using the expensive message.Á T×
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//Á üâ
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> ; // Without `want`, the "send" task may have started toÁ ü¡@ = // produce the expensive message even though we wouldn'tÁ ìâ // be able to use it.Á ü€% " if !we_still_want_message() {Á œ¦ return;Á Lº }Á Ä ú üÈ9 6 // But we can use it! So tell the `want` channel.Á ”‚ tk.want();Á • ú ü™ match rx.recv().await {Á ü¹4 1 Some(_msg) => println!("got a message"),Á üî% " None => println!("DONE"),Á L” ó& <ž });Á ¦ ú ¼ª // Our sending taskÁ ´Â Å# üÙG D // It's expensive to create a new message, so we wait until theÁ ü¡3 0 // receiving end truly *wants* the message.Á üÕ/ , if let Err(_closed) = gv.want().await {Á ü…4 1 // Looks like they will never want it...Á œº ×& LÎ ó& Ø ú üÜ" // They want it, let's go!Á Üÿ tx.send(Expensive);Á <› �) £ ú ”§ # fn main() {}Á <º ```Á https://docs.rs/want/0.3.1Ál 9:@DÀs ׃ ¤, ”œ ‚Ø í° ë ÁÆ „¾ KÙ †J ê÷ „Ä ×
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