rust-service/target/debug/deps/libparking_lot-5fc2c3fdec45feed.rmeta

rust
_L#rustc 1.96.0 (ac68faa20 2026-05-25)ÁÀë‰Š]!ÜÛê(¹Þ—šên-5be7b69c3ff7b5b8ÁíàÄTËŸ ÜJîÄ)'ß\¥!-3d1337db07d0b3aeÁ¤²XctÔ'ÐÓ©z¨É½Ó-a4945860e1c53b00Á¤°ð¾ä-±($²ï=©Ã-7e98a21bfd32b0edÁ–�òÖÀH•‘PIÓHã#£-055f30b747f859b6Árustc_std_workspace_coreÁCçß^ò½èÝ$Çÿ+Cé-c4878ee60b2242c9ÁŸÃï+Ñ]ŠqB<ÏïW#-8dd1dd90e70d0b6aÁminiz_oxideÁ€š»J(P>àö÷g\K-1eb618da2918ab7fÁadler2ÁÆ;+Þ®5¥ÌýÝ°¦ÛLˆ-f7919172d268e069Á	hashbrownÁPäV9ÒÆèÜ�"ÊÖVŽ\-0fc2184a5da6723aÁrustc_std_workspace_allocÁs&ØòØy¯s•bæ!‰ýŠ-97e4bf30be240674Á
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ï³0d›ùµù0¬©�¶¦1´À„·Ò4Ø÷¸Ó|àû¹Ô1Ìõ‡ºÔ„�þ»ÄD¯¼üÍœüÍMJ This library provides implementations of `Mutex`, `RwLock`, `Condvar` andÁü›LI `Once` that are smaller, faster and more flexible than those in the RustÁüè?< standard library. It also provides a `ReentrantMutex` type.ÁEP\h˜ÞßõŠ–šÀ#‚$œ4#½�æ"TŸÏ!R „ V¡©Y¢ð`¤že¥¤^¦¥b§â}©Ž5ËªÝ›«âÃ¬± ƒŠ/í¯Ú/ò°©.å±©.$æ±ì.ë²¯/ï³0ùµù0�¶¦1„·Ò÷¸Ó
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$ü”¡Ä¤ A Condition VariableÁ½úüÁLI Condition variables represent the ability to block a thread such that itÁüŽ	GD consumes no CPU time while waiting for an event to occur. ConditionÁüÖ	MJ variables are typically associated with a boolean predicate (a condition)Áü¤
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LI switch to a different mutex if there are no threads currently waiting onÁÜ› the condition variable.Á·úü»52 # Differences from the standard library `Condvar`ÁñúüõMJ - No spurious wakeups: A wait will only return a non-timeout result if itÁüÃ30   was woken up by `notify_one` or `notify_all`.Áü÷KH - `Condvar::notify_all` will only wake up a single thread, the rest areÁüÃLI   requeued to wait for the `Mutex` to be unlocked by the thread that wasÁ|�   woken up.Áü KH - Only requires 1 word of space, whereas the standard library boxes theÁüì,)   `Condvar` due to platform limitations.Áü™$! - Can be statically constructed.Áü¾2/ - Does not require any drop glue when dropped.Áüñ0- - Inline fast path for the uncontended case.Á¢út¦ # ExamplesÁµú<¹ ```ÁüÁ&# use parking_lot::{Mutex, Condvar};Á¼è use std::sync::Arc;Á¤€ use std::thread;Á•úü™=: let pair = Arc::new((Mutex::new(false), Condvar::new()));Áì× let pair2 = pair.clone();ÁõúüùLI // Inside of our lock, spawn a new thread, and then wait for it to startÁÔÆ thread::spawn(move|| {Áüá,)     let &(ref lock, ref cvar) = &*pair2;ÁüŽ&#     let mut started = lock.lock();ÁÄµ     *started = true;ÁÔÎ     cvar.notify_one();Á<é });Áñúüõ&# // wait for the thread to start upÁüœ'$ let &(ref lock, ref cvar) = &*pair;ÁüÄ" let mut started = lock.lock();Á”ç if !*started {Áüú      cvar.wait(&mut started);Á,› }Áü¡JG // Note that we used an if instead of a while loop above. This is onlyÁüìLI // possible because parking_lot's Condvar will never spuriously wake up.Áü¹PM // This means that wait() will only return after notify_one or notify_all isÁtŠ // called.Á<™çƒ<¬>*¦P/1i>I Ôº,º„IdÙ>"#$'(+-/358;>ìØüìGD Creates a new condition variable which is ready to be waited on andÁl¸
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"ü›" üÓ0- Wakes up one blocked thread on this condvar.Áˆúü�*' Returns whether a thread was woken up.Á¿úüÇIF If there is a blocked thread on this condition variable, then it willÁü•C@ be woken up from its call to `wait` or `wait_timeout`. Calls toÁüÝ-* `notify_one` are not buffered in any way.Á�úü—/, To wake up all threads, see `notify_all()`.ÁËútÓÄƒæú<îçƒìú use parking_lot::Condvar;Áœ úü¤ ! let condvar = Condvar::new();ÁÊ úüÒ =: // do something with condvar, share it with other threadsÁ”!úôœ! if !condvar.notify_one() {Áü¿!30     println!("Nobody was listening for this.");Á,÷!ú‰<�"çƒT¢"ææ>!"!
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O|KYÂõPý˜ü±4!üÉ11. Wakes up all blocked threads on this condvar.Áÿ1úü‡2+( Returns the number of threads woken up.Á·2úü¿2EB This method will ensure that any current waiters on the conditionÁü‰3HE variable are awoken. Calls to `notify_all()` are not buffered in anyÁDÖ3 way.Áã3úüë330 To wake up only one thread, see `notify_one()`.ÁT¸4èè>”?!Ã4!
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($Ó6Ò,Ù6¡8(ÿ•)—–)´–))()¡^×—û˜ÔçA(ÿ•*—–*´–**(*¡^Ö™‚™üòJBüðEFC Blocks the current thread until this condition variable receives aÁŒ»F notification.ÁÑFúüÙFLI This function will atomically unlock the mutex specified (represented byÁüªGJG `mutex_guard`) and block the current thread. This means that any callsÁüùGJG to `notify_*()` which happen logically after the mutex is unlocked areÁüÈHKH candidates to wake this thread up. When this function call returns, theÁü˜I.+ lock specified will have been re-acquired.ÁËIúdÓI	 # PanicsÁäIúüìIJG This function will panic if another thread is waiting on the `Condvar`Áü»J$! with a different `Mutex` object.Á$ùJêëìê>ëçç¥ëÒìÚ�3ÙbŽd¥ì�BÉD³^!¥,,‰K!ÎìÉDþJ
+ÉD$ŠKmutex_guardÁ\�K%'üñTŽü›LIF Waits on this condition variable for a notification, timing out afterÁüéL the specified time instant.Á�Múü•MIF The semantics of this function are equivalent to `wait()` except thatÁüãMGD the thread will be blocked roughly until `timeout` is reached. ThisÁü¯NIF method should not be used for precise timing due to anomalies such asÁüýNEB preemption or platform differences that may not cause the maximumÁüÇO41 amount of time waited to be precisely `timeout`.Á€PúüˆPGD Note that the best effort is made to ensure that the time waited isÁüÔPLI measured with a monotonic clock, and not affected by the changes made toÁ¤¥Q the system time.Á¾QúüÆQFC The returned `WaitTimeoutResult` value indicates if the timeout isÁÔ‘R known to have elapsed.Á°Rúü¸RJG Like `wait`, the lock specified will be re-acquired when this functionÁü‡S>; returns, regardless of whether the timeout elapsed or not.ÁÊSúdÒSð£ãSúüëSJ’¤üºT$æ¤TøTíîïí>îçç¥ëÒìÚ�3ÙbŽd¥ï�BÉDóTóTôT‹õTˆ�At(	¼Í¥Š´=!¥..—U!²§ƒU
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/$‘XÒ,—X³±<©XÃZ/ÿ•0—–0´–00/0³^ý˜‚™�_/ÿ•1—–1´–11/1¡^³^³^�B¤“`/ÿ•2—–2´–22/2”?³^é´”?ý˜üÝs�ü¤lKH Waits on this condition variable for a notification, timing out after aÁ¼ôl specified duration.Á�múü˜mIˆ¨üæmIF the thread will be blocked for roughly no longer than `timeout`. ThisÁü´nI¬©ü‚oEÿ©üÌo4Îª…púü�pG˜«üÙpLé«¤ªq¾¬ÃqúüËqFè¬Ô–r·µrúü½rJçüŒs>»®Däsòóôò>óçç¥ëÒìÚ�3ÙbŽd¥ô�BÉDÖÖû
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O$™ŸtöTúRTVYÝdè›PQüÑ#¬ñü÷WT A mutual exclusive primitive that is always fair, useful for protecting shared dataÁÏúüÓOL This mutex will block threads waiting for the lock to become available. TheÁü£?< mutex can be statically initialized or created by the `new`ÁüãOL constructor. Each mutex has a type parameter which represents the data thatÁü³KH it is protecting. The data can only be accessed through the RAII guardsÁüÿOL returned from `lock` and `try_lock`, which guarantees that the data is onlyÁüÏ+( ever accessed when the mutex is locked.ÁûúüÿFC The regular mutex provided by `parking_lot` uses eventual fairnessÁüÆIF (after some time it will default to the fair algorithm), but eventualÁü�NK fairness does not provide the same guarantees an always fair method would.Áüß<9 Fair mutexes are generally slower, but sometimes needed.Áœ	úü 	OL In a fair mutex the waiters form a queue, and the lock is always granted toÁüð	NK the next requester in the queue, in first-in first-out order. This ensuresÁü¿
OL that one thread cannot starve others by quickly re-acquiring the lock afterÁŒ� releasing it.Á¡úü¥^[ A fair mutex may not be interesting if threads have different priorities (this is known asÁÄ„ priority inversion).Á�úü¡30 # Differences from the standard library `Mutex`ÁÕúüÙ;8 - No poisoning, the lock is released normally on panic.Áü•
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.+   `FairMutex` due to platform limitations.Áü�$•‚üµ2Ã‚üè0ÿ‚ü™EB - Efficient handling of micro-contention using adaptive spinning.Áüß52 - Allows raw locking & unlocking without a guard.Á•út™Äƒ¨ú<¬çƒü´ use parking_lot::FairMutex;ÁüÔ(% use std::sync::{Arc, mpsc::channel};Á¤ýÇ„’úÄ– const N: usize = 10;Á¯úü³OL // Spawn a few threads to increment a shared variable (non-atomically), andÁüƒ=: // let the main thread know once all increments are done.Á4Á //ÁüÈQN // Here we're using an Arc to share memory among threads, and the data insideÁüš)& // the Arc is protected with a mutex.ÁüÄ+( let data = Arc::new(FairMutex::new(0));Áðúìô let (tx, rx) = channel();Á¤’ for _ in 0..10 {Áü§96     let (data, tx) = (Arc::clone(&data), tx.clone());Áüá     thread::spawn(move || {Áü�KH         // The shared state can only be accessed once the lock is held.ÁüÍMJ         // Our non-atomic increment is safe because we're the only threadÁü›GD         // which can access the shared state when the lock is held.Áüã'$         let mut data = data.lock();Á¼‹         *data += 1;ÁÜ£         if *data == N {Áü¿%"             tx.send(()).unwrap();Álå
         }ÁüóGD         // the lock is unlocked here when `data` goes out of scope.Á\»     });Á,Çú‰Íú¼Ñ rx.recv().unwrap();Á<éçƒLú¥SSÍìÉD„ÖJü½8ü¬@= Creates a new fair mutex in an unlocked state ready for use.ÁíúüñKH This allows creating a fair mutex in a constant context on stable Rust.Á„ÊÉDÖJ¥UU‚ùÛ
TÉD¹%ôÒüÅPM An RAII implementation of a "scoped lock" of a mutex. When this structure isÁü–<9 dropped (falls out of scope), the lock will be unlocked.ÁÓúü×NK The data protected by the mutex can be accessed through this guard via itsÁü¦+( `Deref` and `DerefMut` implementations.ÁtÛ™W¥XXWÍì¥îçç¥ëÒìÚ�3ÙbŽd¥™·A—þêNPü˜!$üŸOL An RAII mutex guard returned by `FairMutexGuard::map`, which can point to aÁüï#  subfield of the protected data.Á“úü—WT The main difference between `MappedFairMutexGuard` and `FairMutexGuard` is that theÁüïKH former doesn't support temporarily unlocking and re-locking, since thatÁü» PM could introduce soundness issues if the locked object is modified by anotherÁ\Œ! thread.Á¤¡!™Z¥[[Z�þº!ïïžó@ôïIõÚ?ÌBC½uÖ™·A—þ¶!XZL†,Š^`beâDãÃ\]ÔÑŒæüîB? A mutual exclusion primitive useful for protecting shared dataÁ±úüµOÁßü…?šàüÅOãàü•K¼áüáO‘âü±+êâÝútá # FairnessÁðúüôOL A typical unfair lock can often end up in a situation where a single threadÁüÄPM quickly acquires and releases the same mutex in succession, which can starveÁü•NK other threads waiting to acquire the mutex. While this improves throughputÁüäOL because it doesn't force a context switch when a thread tries to re-acquireÁü´	@= a mutex it has just released, this can starve other threads.Áõ	úüù	QN This mutex uses [eventual fairness](https://trac.webkit.org/changeset/203350)ÁüË
GD to ensure that the lock will be fair on average without sacrificingÁü“MJ throughput. This is done by forcing a fair unlock on average every 0.5ms,ÁüáMJ which will force the lock to go to the next thread waiting for the mutex.Á¯úü³MJ Additionally, any critical section longer than 1ms will always use a fairÁü�
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NK You can also force a fair unlock by calling `MutexGuard::unlock_fair` whenÁüÀB? unlocking a mutex instead of simply dropping the `MutexGuard`.Áƒúü‡3½é»úü¿;†êüûKËêüÇ*'   `Mutex` due to platform limitations.Áüò$•‚ü—2Ã‚üÊ0ÿ‚üûE‚ìüÁ5Ñìü÷FC - Supports eventual fairness so that the mutex is fair on average.Áü¾SP - Optionally allows making the mutex fair by calling `MutexGuard::unlock_fair`.Á’út–Äƒ¥ú<©çƒÜ± use parking_lot::Mutex;ÁüÍ(ëí¤öÇ„‹úÄ�µî¨úü¬Oãîüü=¼ï4º‚ðüÁQ’ðü“)íðü½'$ let data = Arc::new(Mutex::new(0));Áåúìéàñ¤‡†òüœ9¤òüÖçòüöK�óüÂMåóü�G¼ôüØ'�õ¼€½õÜ˜Ýõü´%‚ölÚ°öüèGÇö\°—÷,¼ú‰Âú¼ÆÄ÷<Þçƒ,ï¥__‚ùõ×Lü /ü™;8 Creates a new mutex in an unlocked state ready for use.ÁÕúüÙFC This allows creating a mutex in a constant context on stable Rust.Á\ÉD×L¥aa‚ù¹
`ÉD¹&Ô¤!ü—P»úüè<•û¥ úü© Nçûüø +¿üT!™c¥ddc�þ¼!çç¥ëÒìÚ�3ÙbŽd¥™�B—þ¸!NPüÖ$ üé!KH An RAII mutex guard returned by `MutexGuard::map`, which can point to aÁüµ"#áþÙ"úüÝ"OL The main difference between `MappedMutexGuard` and `MutexGuard` is that theÁü#Kûÿüù#PÐ€\Ê$©�„ß$™f¥ggf�þô$ïïžó@ôïIõÚ?ÌBC½uÖ™�B—þð$XZD‘$•vwxy}~ËŸ2”ÞŽhi×‚ `hkí‡ëhl¼,Ÿ–_hnAtomicU8ÁD¦üÀho®D°¼Àhp¨$ÕhrSpinWaitÁDÛµhsÇs”åJhtDEFAULT_UNPARK_TOKENÁ¤ùIhuüÑå$öØÚÉËüö&¿Á¨ª˜š„ÂŒvxgiDF”‘D—hÒM¤©T¯hÒM¤ÃTÉhÒM¤ÝTãhÒMtÊž?{|ìÖ	üß<9 Returns whether the associated `Once` has been poisoned.Á úü¨LI Once an initialization routine for a `Once` has panicked it will foreverÁüùJG indicate to future forced initialization routines that it is poisoned.ÁDÝ	ž?zz
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