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D? 4? :T] uAJA$@ @ $@ @ @ > ?\ K> ,> <4? ^K/ -f*uA A $A $A  ԒA 7$A  A| A A $A $A  A 4B B B $B B 4B B @ @ $@ ,@ 4A 9K' ,^o D D $D $D  ԛD 7$D  D ԂE E bT] u6HJ@H$J J $J J J I IZ KI ,I $4I ^K. ,eiuK K $K K )$K  K| L ĢL  $L ԢL 4L L L $L L 4M M K K $K ,K 4K K' ,^U M M $M M TN AN  N" $N ?1N N  TN AN  N A$܎O  AP   TP AtP AP%    , AP  P  O O  ,O  RC O >  O ,Q  cAAAuIU AU  TU AtU AV  V  U U {mTV A [LU GU ,W l  Z ,\  c<\ (\" ] $\ ,]  ] ] X Y Y KX ,X KkA,Y vVVKA:uBvAAׄVVK~A+A)A/^T] A]  ]" $] ?1] ]/  T^ A]4  ^ A%ܪ^ ^  $^ ^ ^ ] K] ,] AAvV K6YA&T_ A`  _7 L_ ?t_ A A_, `  T` A`  a A$a ta $a a a _ _ K_ ,_ A,_ v#VAK8<p AAVTb Ab  Tb Atb Ab* Tb A !A@Ab  bv Lb 6bk c   Tc Ac   c A$c# c  $c c d a a  Ka ,a A,b vA`AׄqV)AKQUAAAA<Ae e $e e )$e  e lf  ř[f( f $f 9f# 4f f f $f f 4g g d e $e ,e [x ,y c '?28?| }~%C08?H )h /H6dȌls 'C2D9@EP\h< 4   TL Rt V Y\  ` e, ^T b$ }5L d D  L /  /̫ .\ ..t / 0d 014|1DMJ This library provides implementations of `Mutex`, `RwLock`, `Condvar` andLI `Once` that are smaller, faster and more flexible than those in the Rust?< standard library. It also provides a `ReentrantMutex` type.EP\h#$4#" T!R VY `e^b}5 / /..$./0 01 1   \<TbDl d  D 2$ c   AtomicPtrLaD RawMutex_L$ ParkResultT RequeueOpL UnparkResultdDEFAULT_PARK_TOKEN JDerefMutD"DȲ<R,y|$pscf&RUEH2'L?96 Returns whether the wait was known to have timed out.L?Bf'Ĥ A Condition VariableLI Condition variables represent the ability to block a thread such that it GD consumes no CPU time while waiting for an event to occur. Condition MJ variables are typically associated with a boolean predicate (a condition) LI and a mutex. The predicate is always verified inside of the mutex before '$ determining that thread must block.  KH Note that this module places one additional restriction over the system JG condition variables: each condvar can be used with only one mutex at a LI time. Any attempt to use multiple mutexes on the same condition variable LI simultaneously will result in a runtime panic. However it is possible to LI switch to a different mutex if there are no threads currently waiting onܛ the condition variable.52 # Differences from the standard library `Condvar`MJ - No spurious wakeups: A wait will only return a non-timeout result if it30 was woken up by `notify_one` or `notify_all`.KH - `Condvar::notify_all` will only wake up a single thread, the rest areLI requeued to wait for the `Mutex` to be unlocked by the thread that was| woken up.KH - Only requires 1 word of space, whereas the standard library boxes the,) `Condvar` due to platform limitations.$! - Can be statically constructed.2/ - Does not require any drop glue when dropped.0- - Inline fast path for the uncontended case.t # Examples< ```&# use parking_lot::{Mutex, Condvar}; use std::sync::Arc; use std::thread;=: let pair = Arc::new((Mutex::new(false), Condvar::new())); let pair2 = pair.clone();LI // Inside of our lock, spawn a new thread, and then wait for it to start thread::spawn(move|| {,) let &(ref lock, ref cvar) = &*pair2;&# let mut started = lock.lock();ĵ *started = true; cvar.notify_one();< });&# // wait for the thread to start up'$ let &(ref lock, ref cvar) = &*pair;" let mut started = lock.lock(); if !*started {  cvar.wait(&mut started);, }JG // Note that we used an if instead of a while loop above. This is onlyLI // possible because parking_lot's Condvar will never spuriously wake up.PM // This means that wait() will only return after notify_one or notify_all ist // called.<<@A ֈL Ժ,Qd@"#$'(+-/358;>GD Creates a new condition variable which is ready to be waited on andl notified.@B!!s" 0- Wakes up one blocked thread on this condvar.*' Returns whether a thread was woken up.IF If there is a blocked thread on this condition variable, then it willC@ be woken up from its call to `wait` or `wait_timeout`. Calls to-* `notify_one` are not buffered in any way./, To wake up all threads, see `notify_all()`.t< use parking_lot::Condvar;  ! let condvar = Condvar::new();  =: // do something with condvar, share it with other threads!! if !condvar.notify_one() {!30 println!("Nobody was listening for this.");,!<"T" @B! "! #$"$7|$ @RB! $!U$$,$&$%%%%$%KAbortUnparkOneRequeueRest RequeueAll UnparkOne RequeueOneCF2UV Rܢ.$&&&&$&unparked_threadsrequeued_threadshave_more_threadsbe_fair_sealedgQ}ꑖUV4!11. Wakes up all blocked threads on this condvar.12+( Returns the number of threads woken up.22EB This method will ensure that any current waiters on the condition3HE variable are awoken. Calls to `notify_all()` are not buffered in anyD3 way.3330 To wake up only one thread, see `notify_one()`.T4 @AB! 4! '$468|6 @RAB! 6!Y$6,68())))()ȻA(****(*̻JBEFC Blocks the current thread until this condition variable receives aF notification.FFLI This function will atomically unlock the mutex specified (represented byGJG `mutex_guard`) and block the current thread. This means that any callsGJG to `notify_*()` which happen logically after the mutex is unlocked areHKH candidates to wake this thread up. When this function call returns, theI.+ lock specified will have been re-acquired.IdI # PanicsIIJG This function will panic if another thread is waiting on the `Condvar`J$! with a different `Mutex` object.$J @    $䳛DFKB!,, K!F4K +F$K^D. JTLIF Waits on this condition variable for a notification, timing out afterL the specified time instant.MMIF The semantics of this function are equivalent to `wait()` except thatMGD the thread will be blocked roughly until `timeout` is reached. ThisNIF method should not be used for precise timing due to anomalies such asNEB preemption or platform differences that may not cause the maximumO41 amount of time waited to be precisely `timeout`.PPGD Note that the best effort is made to ensure that the time waited isPLI measured with a monotonic clock, and not affected by the changes made toQ the system time.QQFC The returned `WaitTimeoutResult` value indicates if the timeout isԑR known to have elapsed.RRJG Like `wait`, the lock specified will be re-acquired when this functionS>; returns, regardless of whether the timeout elapsed or not.SdSSSJT$TT @    $䳛DF[?B!.. U!4U -F$U^0`(0 UW^W @ D^?B! X!\$X,X`Ds @    $䳛DFd?B!44 t!4s 3F$t^1`1 sv̘v @    $䳛DFg^?B!6767 v!4wg v#g Fw#g$xl$v^4jLw`4 voqāzFzJG notification. If the provided condition evaluates to `false`, then the{FC thread is no longer blocked and the operation is completed. If the|GD condition evaluates to `true`, then the thread is blocked again and|A> waits for another notification before repeating this process.}}L}J~JK.dJ$Tˁ @    $䳛DFgKB!9:9: ܁!4 ف#g F#g$ς 8Fg$݁^'6j16 ցtvIFC the specified time instant. If the provided condition evaluates tońFC `false`, then the thread is no longer blocked and the operation isGD completed. If the condition evaluates to `true`, then the thread is܅EB blocked again and waits for another notification before repeating this process.ĆIGއIE4GLԊFߋJ>dJ$ @    $䳛DFg[?B!<==< ǎ!4ۏ #g F#g$ ;Fg$Ȏ^7j!7`+7 {}KGD specified duration. If the provided condition evaluates to `false`,HE then the thread is no longer blocked and the operation is completed.͒JG If the condition evaluates to `true`, then the thread is blocked againEB and waits for another notification before repeating this process.IIIؕE4ۖGLFJ>t @    $䳛DFgd?B!?@?@ !4̚ Ԛ#g F#g$ >Fg$^8j8`8 ɚ{}ė@BBĝ<ǝ@BAA B@DgD8 @ ggg cgKcثq1ȡKBC C D$ \<GK AtomicUsize\EFԴGGG!HIJHIJHlJId<GG  ÜĜŜƜǜȜ_wBG G I$current< I BG G J$dB %hardware-lock-elision ! $ 4    - n s ~AMNOHIJNOd < LLA V  AAAuBL L N$ :: 6  AAABL L O$ 0;tTRTVYdPQ#WT A mutual exclusive primitive that is always fair, useful for protecting shared dataOL This mutex will block threads waiting for the lock to become available. The?< mutex can be statically initialized or created by the `new`OL constructor. Each mutex has a type parameter which represents the data thatKH it is protecting. The data can only be accessed through the RAII guardsOL returned from `lock` and `try_lock`, which guarantees that the data is only+( ever accessed when the mutex is locked.FC The regular mutex provided by `parking_lot` uses eventual fairnessIF (after some time it will default to the fair algorithm), but eventualNK fairness does not provide the same guarantees an always fair method would.<9 Fair mutexes are generally slower, but sometimes needed.  OL In a fair mutex the waiters form a queue, and the lock is always granted to NK the next requester in the queue, in first-in first-out order. This ensures OL that one thread cannot starve others by quickly re-acquiring the lock after  releasing it.  ^[ A fair mutex may not be interesting if threads have different priorities (this is known asĄ  priority inversion).  30 # Differences from the standard library `Mutex`  ;8 - No poisoning, the lock is released normally on panic. KH - Only requires 1 byte of space, whereas the standard library boxes the .+ `FairMutex` due to platform limitations.$20EB - Efficient handling of micro-contention using adaptive spinning.52 - Allows raw locking & unlocking without a guard.t< use parking_lot::FairMutex;(% use std::sync::{Arc, mpsc::channel};Ė const N: usize = 10;OL // Spawn a few threads to increment a shared variable (non-atomically), and=: // let the main thread know once all increments are done.4 //QN // Here we're using an Arc to share memory among threads, and the data inside)& // the Arc is protected with a mutex.+( let data = Arc::new(FairMutex::new(0)); let (tx, rx) = channel(); for _ in 0..10 {96 let (data, tx) = (Arc::clone(&data), tx.clone()); thread::spawn(move || {KH // The shared state can only be accessed once the lock is held.MJ // Our non-atomic increment is safe because we're the only threadGD // which can access the shared state when the lock is held.'$ let mut data = data.lock(); *data += 1;ܣ if *data == N {%" tx.send(()).unwrap();l }GD // the lock is unlocked here when `data` goes out of scope.\ });, rx.recv().unwrap();<LSSF x8@= Creates a new fair mutex in an unlocked state ready for use.KH This allows creating a fair mutex in a constant context on stable Rust.FxBUU  TF<PM An RAII implementation of a "scoped lock" of a mutex. When this structure is<9 dropped (falls out of scope), the lock will be unlocked.NK The data protected by the mutex can be accessed through this guard via its+( `Deref` and `DerefMut` implementations.tWXXW    $䳛CNP!$OL An RAII mutex guard returned by `FairMutexGuard::map`, which can point to a# subfield of the protected data.WT The main difference between `MappedFairMutexGuard` and `FairMutexGuard` is that theKH former doesn't support temporarily unlocking and re-locking, since that PM could introduce soundness issues if the locked object is modified by another\! thread.!Z[[Z !@ \   f5zlC!XZL,^`beD\]B? A mutual exclusion primitive useful for protecting shared dataO?OKO+ȁt # FairnessOL A typical unfair lock can often end up in a situation where a single threadPM quickly acquires and releases the same mutex in succession, which can starveNK other threads waiting to acquire the mutex. While this improves throughputOL because it doesn't force a context switch when a thread tries to re-acquire @= a mutex it has just released, this can starve other threads.  QN This mutex uses [eventual fairness](https://trac.webkit.org/changeset/203350) GD to ensure that the lock will be fair on average without sacrificing MJ throughput. This is done by forcing a fair unlock on average every 0.5ms, MJ which will force the lock to go to the next thread waiting for the mutex.  MJ Additionally, any critical section longer than 1ms will always use a fair NK unlock, which has a negligible impact on throughput considering the length  of the critical section.  NK You can also force a fair unlock by calling `MutexGuard::unlock_fair` whenB? unlocking a mutex instead of simply dropping the `MutexGuard`.3;K*' `Mutex` due to platform limitations.$20E5FC - Supports eventual fairness so that the mutex is fair on average.SP - Optionally allows making the mutex fair by calling `MutexGuard::unlock_fair`.t<ܱ use parking_lot::Mutex;(ɌďO=4Q)ˏ'$ let data = Arc::new(Mutex::new(0));9őKMÒG'ܘ%lG\,<,__ ]/;8 Creates a new mutex in an unlocked state ready for use.FC This allows creating a mutex in a constant context on stable Rust.\F]Baa  `FV=Ԥ!P<  NŚ +T!cddc !   $䳛D!NP$ !KH An RAII mutex guard returned by `MutexGuard::map`, which can point to a"#""OL The main difference between `MappedMutexGuard` and `MutexGuard` is that the#Kٞ#P\$$fggf $@ \   f5zlD$XZD$vwxy}~2hichk hl, bhnAtomicU8DӝhoDhp$hrSpinWaitDhsĖ JhtDEFAULT_UNPARK_TOKEN Ihu$&wygiDFDh}Th}Th}Th}tA{| <9 Returns whether the associated `Once` has been poisoned.LI Once an initialization routine for a `Once` has panicked it will foreverJG indicate to future forced initialization routines that it is poisoned.D ABzz {A̖  EB Returns whether the associated `Once` has successfully executed ad  closure.$ ABzz |B] C@ A synchronization primitive which can be used to run a one-time JG initialization. Useful for one-time initialization for globals, FFI or  related functionality.  2/ # Differences from the standard library `Once`  74 - Only requires 1 byte of space, instead of 1 word.# - Not required to be `'static`.OL - Relaxed memory barriers in the fast path, which can significantly improve(% performance on some architectures.Et<Ԃ use parking_lot::Once;%" static START: Once = Once::new(); START.call_once(|| {" // run initialization here<<$CsvA(~CBk`2hCB}} ~Dh}}LC Creates a new `Once` value.CB -* Returns the current state of this `Once`., CAB  $$?LI Performs an initialization routine once and only once. The given closureKH will be executed if this is the first time `call_once` has been called,41 and otherwise the routine will *not* be invoked.GD This method will block the calling thread if another initialization! routine is currently running.IF When this function returns, it is guaranteed that some initializationKH has run and completed (it may not be the closure specified). It is alsoKH guaranteed that any memory writes performed by the executed closure canC@ be reliably observed by other threads at this point (there is aLI happens-before relation between the closure and code executing after thed return).t<Ԑ static mut VAL: usize = 0;$! static INIT: Once = Once::new();KH // Accessing a `static mut` is unsafe much of the time, but if we do soIF // in a synchronized fashion (e.g. write once or read all) then we're // good to go!4JG // This function will only call `expensive_computation` once, and willLI // otherwise always return the value returned from the first invocation." fn get_cached_val() -> usize {  unsafe {  INIT.call_once(|| { .+ VAL = expensive_computation();|  });|! VALL! },!!!)& fn expensive_computation() -> usize {t! // ...<" # 2,"<""d"""@= The closure `f` will only be executed once if this is called#LI concurrently amongst many threads. If that closure panics, however, then#LI it will *poison* this `Once` instance, causing all future invocations of$ `call_once` to also panic.L$ CۏKB $ۏ $#ۏKD%#ۏKK ۏ$$HBD&*N&GD Performs the same function as `call_once` except ignores poisoning.''HE If this `Once` has been poisoned (some initialization panicked) then(KH this function will continue to attempt to call initialization functions($! until one of them doesn't panic.))IF The closure `f` is yielded a structure which can be used to query the)KH state of this `Once` (whether initialization has previously panicked orL* not).|* CۏKB * *#ۏ+#ۏK ۏ$*1MDF<,2Kt2h C ##KKB 2$2 ignore_poisonl2 2CȌDK4DK-oTHhB/H6 CBB|oMhBB HDHhH B#HH$H BKB I $IRCRAD O   D^AB   $ `<  prev_valueT  α Kԩ α̸ α \  D^-AB- ϔ  # A̭ #$• $Д `<ޔ token, D validate_flagstЕ  ß K αԾ   DKB Ҫ $Ӫ Ԍ   DKB  $ \<D NonZeroUsized$ GetThreadId\lQDA&(MJ Implementation of the `GetThreadId` trait for `lock_api::ReentrantMutex`.\E`(E'E$E+ E      >WTpYAB  $ }UKԵ ?< A mutex which can be recursively locked by a single thread.  FC This type is identical to `Mutex` except for the following points:  PM - Locking multiple times from the same thread will work correctly instead of  deadlocking. PM - `ReentrantMutexGuard` does not give mutable references to the locked data. '$ Use a `RefCell` if you need this.  KH See [`Mutex`](crate::Mutex) for more details about the underlying mutext  primitive.t   B EB Creates a new reentrant mutex in an unlocked state ready for use.  PM This allows creating a reentrant mutex in a constant context on stable Rust.FB  Fѭ#WT An RAII implementation of a "scoped lock" of a reentrant mutex. When this structure?< is dropped (falls out of scope), the lock will be unlocked.NŚ `Deref` implementation. /. i%iY@*DESU)TQ An RAII mutex guard returned by `ReentrantMutexGuard::map`, which can point to a#a^ The main difference between `MappedReentrantMutexGuard` and `ReentrantMutexGuard` is that theKٞP\ /@\ TàPDE^`T4 L A reader-writer lockMJ This type of lock allows a number of readers or at most one writer at anyOL point in time. The write portion of this lock typically allows modificationOL of the underlying data (exclusive access) and the read portion of this lock:7 typically allows for read-only access (shared access).JG This lock uses a task-fair locking policy which avoids both reader andNK writer starvation. This means that readers trying to acquire the lock willPM block even if the lock is unlocked when there are writers waiting to acquireJG the lock. Because of this, attempts to recursively acquire a read lock41 within a single thread may result in a deadlock.MJ The type parameter `T` represents the data that this lock protects. It isPM required that `T` satisfies `Send` to be shared across threads and `Sync` to NK allow concurrent access through readers. The RAII guards returned from the NK locking methods implement `Deref` (and `DerefMut` for the `write` methods) 1. to allow access to the contained of the lock. t   O OL quickly acquires and releases the same lock in succession, which can starve OL other threads waiting to acquire the rwlock. While this improves throughput O A> a rwlock it has just released, this can starve other threads.RO This rwlock uses [eventual fairness](https://trac.webkit.org/changeset/203350)GǧMNK which will force the lock to go to the next thread waiting for the rwlock.MҩNNK You can also force a fair unlock by calling `RwLockReadGuard::unlock_fair`OL or `RwLockWriteGuard::unlock_fair` when unlocking a mutex instead of simply dropping the guard.41 # Differences from the standard library `RwLock`DA - Supports atomically downgrading a write lock into a read lock.JG - Task-fair locking policy instead of an unspecified platform default.;K+( `RwLock` due to platform limitations.$20E5GD - Supports eventual fairness so that the rwlock is fair on average.96 - Optionally allows making the rwlock fair by callingIF `RwLockReadGuard::unlock_fair` and `RwLockWriteGuard::unlock_fair`.t< use parking_lot::RwLock; let lock = RwLock::new(5);,) // many reader locks can be held at once, { let r1 = lock.read(); let r2 = lock.read();܊ assert_eq!(*r1, 5);ܦ assert_eq!(*r2, 5);-* } // read locks are dropped at this point/, // only one write lock may be held, however,! let mut w = lock.write(); *w += 1; assert_eq!(*w, 6);# } // write lock is dropped here<4  1?< Creates a new instance of an `RwLock` which is unlocked.LI This allows creating a `RwLock` in a constant context on stable Rust.dFB  F! HE RAII structure used to release the shared read access of a lock whend! dropped.|! !0 gG`c.D!PR" "LI RAII structure used to release the exclusive write access of a lock whend"" #0 ]ooD#PR&%#TQ An RAII read lock guard returned by `RwLockReadGuard::map`, which can point to a$#$$YV The main difference between `MappedRwLockReadGuard` and `RwLockReadGuard` is that the%Kٞ%P\&& &0@\ !R{D&[]*&'VS An RAII write lock guard returned by `RwLockWriteGuard::map`, which can point to a'#(([X The main difference between `MappedRwLockWriteGuard` and `RwLockWriteGuard` is that the(Kٞ)P\** *1@\ ؜0|D*[]+)*LI RAII structure used to release the upgradable read access of a lock whend++ +10 ~{"D+PRD$D Ȳ< RL ,.  N   #),.&   $ +   F%  FF F \ 8 \ d^Bb`d  +Dacquire_resource  \release_resource  ]79  Ĺ  #\ l  \ uxT nqcf "\̷ Q Fl ;>/2#&dTGKH A type indicating whether a timed wait on a condition variable returned due to a time out or not.?䲝?BG2?B $t$?gt$t$ ? ggg cgKcثq1ȡKB t$t$&?&?&& ? ?B & &&?&&&& ?KB & ?5'5'5'?5'?5'5' ??B 5' Current state of a `Once`.LAj'$ A closure has not been executed yet7AJLAD(% A closure was executed but panicked.8AKMAT.+ A thread is currently executing a closure.>AQSA$)& A closure has completed successfully.9ALNA "Aq>q>q>Aq>Aq>q> AAB# q>> A>>>> AKB$ >?!A?!A?? A AB% ? ??"Ag?? 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