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How to use Enter method of Microsoft.Coyote.Rewriting.Types.Threading.Monitor class

Best Coyote code snippet using Microsoft.Coyote.Rewriting.Types.Threading.Monitor.Enter

Monitor.cs

Source:Monitor.cs

...20    {21        /// <summary>22        /// Acquires an exclusive lock on the specified object.23        /// </summary>24        public static void Enter(object obj)25        {26            var runtime = CoyoteRuntime.Current;27            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)28            {29                SynchronizedBlock.Lock(obj);30            }31            else32            {33                if (runtime.SchedulingPolicy is SchedulingPolicy.Fuzzing &&34                    runtime.TryGetExecutingOperation(out ControlledOperation current))35                {36                    runtime.DelayOperation(current);37                }38                SystemThreading.Monitor.Enter(obj);39            }40        }41        /// <summary>42        /// Acquires an exclusive lock on the specified object.43        /// </summary>44        public static void Enter(object obj, ref bool lockTaken)45        {46            var runtime = CoyoteRuntime.Current;47            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)48            {49                lockTaken = SynchronizedBlock.Lock(obj).IsLockTaken;50            }51            else52            {53                if (runtime.SchedulingPolicy is SchedulingPolicy.Fuzzing &&54                    runtime.TryGetExecutingOperation(out ControlledOperation current))55                {56                    runtime.DelayOperation(current);57                }58                SystemThreading.Monitor.Enter(obj, ref lockTaken);59            }60        }61        /// <summary>62        /// Releases an exclusive lock on the specified object.63        /// </summary>64        public static void Exit(object obj)65        {66            var runtime = CoyoteRuntime.Current;67            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)68            {69                var block = SynchronizedBlock.Find(obj) ??70                    throw new SystemThreading.SynchronizationLockException();71                block.Exit();72            }73            else74            {75                SystemThreading.Monitor.Exit(obj);76            }77        }78        /// <summary>79        /// Determines whether the current thread holds the lock on the specified object.80        /// </summary>81        public static bool IsEntered(object obj)82        {83            var runtime = CoyoteRuntime.Current;84            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)85            {86                var block = SynchronizedBlock.Find(obj) ??87                    throw new SystemThreading.SynchronizationLockException();88                return block.IsEntered();89            }90            return SystemThreading.Monitor.IsEntered(obj);91        }92        /// <summary>93        /// Notifies a thread in the waiting queue of a change in the locked object's state.94        /// </summary>95        public static void Pulse(object obj)96        {97            var runtime = CoyoteRuntime.Current;98            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)99            {100                var block = SynchronizedBlock.Find(obj) ??101                    throw new SystemThreading.SynchronizationLockException();102                block.Pulse();103            }104            else105            {106                SystemThreading.Monitor.Pulse(obj);107            }108        }109        /// <summary>110        /// Notifies all waiting threads of a change in the object's state.111        /// </summary>112        public static void PulseAll(object obj)113        {114            var runtime = CoyoteRuntime.Current;115            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)116            {117                var block = SynchronizedBlock.Find(obj) ??118                    throw new SystemThreading.SynchronizationLockException();119                block.PulseAll();120            }121            else122            {123                SystemThreading.Monitor.PulseAll(obj);124            }125        }126        /// <summary>127        /// Attempts, for the specified amount of time, to acquire an exclusive lock on the specified object,128        /// and atomically sets a value that indicates whether the lock was taken.129        /// </summary>130        public static void TryEnter(object obj, TimeSpan timeout, ref bool lockTaken)131        {132            var runtime = CoyoteRuntime.Current;133            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)134            {135                // TODO: how to implement this timeout?136                lockTaken = SynchronizedBlock.Lock(obj).IsLockTaken;137            }138            else139            {140                if (runtime.SchedulingPolicy is SchedulingPolicy.Fuzzing &&141                    runtime.TryGetExecutingOperation(out ControlledOperation current))142                {143                    runtime.DelayOperation(current);144                }145                SystemThreading.Monitor.TryEnter(obj, timeout, ref lockTaken);146            }147        }148        /// <summary>149        /// Attempts, for the specified amount of time, to acquire an exclusive lock on the specified object,150        /// and atomically sets a value that indicates whether the lock was taken.151        /// </summary>152        public static bool TryEnter(object obj, TimeSpan timeout)153        {154            var runtime = CoyoteRuntime.Current;155            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)156            {157                // TODO: how to implement this timeout?158                return SynchronizedBlock.Lock(obj).IsLockTaken;159            }160            else if (runtime.SchedulingPolicy is SchedulingPolicy.Fuzzing &&161                runtime.TryGetExecutingOperation(out ControlledOperation current))162            {163                runtime.DelayOperation(current);164            }165            return SystemThreading.Monitor.TryEnter(obj, timeout);166        }167        /// <summary>168        /// Attempts, for the specified number of milliseconds, to acquire an exclusive lock on the specified object,169        /// and atomically sets a value that indicates whether the lock was taken.170        /// </summary>171        public static void TryEnter(object obj, int millisecondsTimeout, ref bool lockTaken)172        {173            var runtime = CoyoteRuntime.Current;174            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)175            {176                // TODO: how to implement this timeout?177                lockTaken = SynchronizedBlock.Lock(obj).IsLockTaken;178            }179            else180            {181                if (runtime.SchedulingPolicy is SchedulingPolicy.Fuzzing &&182                    runtime.TryGetExecutingOperation(out ControlledOperation current))183                {184                    runtime.DelayOperation(current);185                }186                SystemThreading.Monitor.TryEnter(obj, millisecondsTimeout, ref lockTaken);187            }188        }189        /// <summary>190        /// Attempts to acquire an exclusive lock on the specified object, and atomically191        /// sets a value that indicates whether the lock was taken.192        /// </summary>193        public static void TryEnter(object obj, ref bool lockTaken)194        {195            var runtime = CoyoteRuntime.Current;196            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)197            {198                // TODO: how to implement this timeout?199                lockTaken = SynchronizedBlock.Lock(obj).IsLockTaken;200            }201            else202            {203                if (runtime.SchedulingPolicy is SchedulingPolicy.Fuzzing &&204                    runtime.TryGetExecutingOperation(out ControlledOperation current))205                {206                    runtime.DelayOperation(current);207                }208                SystemThreading.Monitor.TryEnter(obj, ref lockTaken);209            }210        }211        /// <summary>212        /// Attempts to acquire an exclusive lock on the specified object.213        /// </summary>214        public static bool TryEnter(object obj)215        {216            var runtime = CoyoteRuntime.Current;217            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)218            {219                return SynchronizedBlock.Lock(obj).IsLockTaken;220            }221            else if (runtime.SchedulingPolicy is SchedulingPolicy.Fuzzing &&222                runtime.TryGetExecutingOperation(out ControlledOperation current))223            {224                runtime.DelayOperation(current);225            }226            return SystemThreading.Monitor.TryEnter(obj);227        }228        /// <summary>229        /// Releases the lock on an object and blocks the current thread until it reacquires the lock.230        /// </summary>231        public static bool Wait(object obj)232        {233            var runtime = CoyoteRuntime.Current;234            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)235            {236                var block = SynchronizedBlock.Find(obj) ??237                    throw new SystemThreading.SynchronizationLockException();238                return block.Wait();239            }240            return SystemThreading.Monitor.Wait(obj);241        }242        /// <summary>243        /// Releases the lock on an object and blocks the current thread until it reacquires the lock.244        /// If the specified time-out interval elapses, the thread enters the ready queue.245        /// </summary>246        public static bool Wait(object obj, int millisecondsTimeout)247        {248            var runtime = CoyoteRuntime.Current;249            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)250            {251                var block = SynchronizedBlock.Find(obj) ??252                    throw new SystemThreading.SynchronizationLockException();253                return block.Wait(millisecondsTimeout);254            }255            return SystemThreading.Monitor.Wait(obj, millisecondsTimeout);256        }257        /// <summary>258        /// Releases the lock on an object and blocks the current thread until it reacquires the lock. If the259        /// specified time-out interval elapses, the thread enters the ready queue. This method also specifies260        /// whether the synchronization domain for the context (if in a synchronized context) is exited before261        /// the wait and reacquired afterward.262        /// </summary>263        public static bool Wait(object obj, int millisecondsTimeout, bool exitContext)264        {265            var runtime = CoyoteRuntime.Current;266            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)267            {268                var block = SynchronizedBlock.Find(obj) ??269                    throw new SystemThreading.SynchronizationLockException();270                // TODO: implement exitContext.271                return block.Wait(millisecondsTimeout);272            }273            return SystemThreading.Monitor.Wait(obj, millisecondsTimeout, exitContext);274        }275        /// <summary>276        /// Releases the lock on an object and blocks the current thread until it reacquires the lock.277        /// If the specified time-out interval elapses, the thread enters the ready queue.278        /// </summary>279        public static bool Wait(object obj, TimeSpan timeout)280        {281            var runtime = CoyoteRuntime.Current;282            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)283            {284                var block = SynchronizedBlock.Find(obj) ??285                    throw new SystemThreading.SynchronizationLockException();286                return block.Wait(timeout);287            }288            return SystemThreading.Monitor.Wait(obj, timeout);289        }290        /// <summary>291        /// Releases the lock on an object and blocks the current thread until it reacquires the lock.292        /// If the specified time-out interval elapses, the thread enters the ready queue. Optionally293        /// exits the synchronization domain for the synchronized context before the wait and reacquires294        /// the domain afterward.295        /// </summary>296        public static bool Wait(object obj, TimeSpan timeout, bool exitContext)297        {298            var runtime = CoyoteRuntime.Current;299            if (runtime.SchedulingPolicy is SchedulingPolicy.Interleaving)300            {301                var block = SynchronizedBlock.Find(obj) ??302                    throw new SystemThreading.SynchronizationLockException();303                // TODO: implement exitContext.304                return block.Wait(timeout);305            }306            return SystemThreading.Monitor.Wait(obj, timeout, exitContext);307        }308        /// <summary>309        /// Provides a mechanism that synchronizes access to objects.310        /// </summary>311        internal class SynchronizedBlock : IDisposable312        {313            /// <summary>314            /// Cache from synchronized objects to synchronized block instances.315            /// </summary>316            private static readonly ConcurrentDictionary<object, Lazy<SynchronizedBlock>> Cache =317                new ConcurrentDictionary<object, Lazy<SynchronizedBlock>>();318            /// <summary>319            /// The object used for synchronization.320            /// </summary>321            protected readonly object SyncObject;322            /// <summary>323            /// True if the lock was taken, else false.324            /// </summary>325            internal bool IsLockTaken;326            /// <summary>327            /// The resource associated with this synchronization object.328            /// </summary>329            private readonly Resource Resource;330            /// <summary>331            /// The current owner of this synchronization object.332            /// </summary>333            private ControlledOperation Owner;334            /// <summary>335            /// Wait queue of asynchronous operations.336            /// </summary>337            private readonly List<ControlledOperation> WaitQueue;338            /// <summary>339            /// Ready queue of asynchronous operations.340            /// </summary>341            private readonly List<ControlledOperation> ReadyQueue;342            /// <summary>343            /// Queue of nondeterministically buffered pulse operations to be performed after releasing344            /// the lock. This allows modeling delayed pulse operations by the operation system.345            /// </summary>346            private readonly Queue<PulseOperation> PulseQueue;347            /// <summary>348            /// The number of times that the lock has been acquired per owner. The lock can only349            /// be acquired more than one times by the same owner. A count > 1 indicates that the350            /// invocation by the current owner is reentrant.351            /// </summary>352            private readonly Dictionary<ControlledOperation, int> LockCountMap;353            /// <summary>354            /// Used to reference count accesses to this synchronized block355            /// so that it can be removed from the cache.356            /// </summary>357            private int UseCount;358            /// <summary>359            /// Initializes a new instance of the <see cref="SynchronizedBlock"/> class.360            /// </summary>361            private SynchronizedBlock(object syncObject)362            {363                if (syncObject is null)364                {365                    throw new ArgumentNullException(nameof(syncObject));366                }367                this.SyncObject = syncObject;368                this.Resource = new Resource();369                this.WaitQueue = new List<ControlledOperation>();370                this.ReadyQueue = new List<ControlledOperation>();371                this.PulseQueue = new Queue<PulseOperation>();372                this.LockCountMap = new Dictionary<ControlledOperation, int>();373                this.UseCount = 0;374            }375            /// <summary>376            /// Creates a new <see cref="SynchronizedBlock"/> for synchronizing access377            /// to the specified object and enters the lock.378            /// </summary>379            internal static SynchronizedBlock Lock(object syncObject) =>380                Cache.GetOrAdd(syncObject, key => new Lazy<SynchronizedBlock>(381                    () => new SynchronizedBlock(key))).Value.EnterLock();382            /// <summary>383            /// Finds the synchronized block associated with the specified synchronization object.384            /// </summary>385            internal static SynchronizedBlock Find(object syncObject) =>386                Cache.TryGetValue(syncObject, out Lazy<SynchronizedBlock> lazyMock) ? lazyMock.Value : null;387            /// <summary>388            /// Determines whether the current thread holds the lock on the sync object.389            /// </summary>390            internal bool IsEntered()391            {392                if (this.Owner != null)393                {394                    var op = this.Resource.Runtime.GetExecutingOperation();395                    return this.Owner == op;396                }397                return false;398            }399            private SynchronizedBlock EnterLock()400            {401                this.IsLockTaken = true;402                SystemInterlocked.Increment(ref this.UseCount);403                if (this.Owner is null)404                {405                    // If this operation is trying to acquire this lock while it is free, then inject a scheduling406                    // point to give another enabled operation the chance to race and acquire this lock.407                    this.Resource.Runtime.ScheduleNextOperation(default, SchedulingPointType.Acquire);408                }409                if (this.Owner != null)410                {411                    var op = this.Resource.Runtime.GetExecutingOperation();412                    if (this.Owner == op)413                    {...

MonitorTests.cs

Source:MonitorTests.cs

...146                bool waiting = false;147                List<string> log = new List<string>();148                Task t1 = Task.Run(() =>149                {150                    Monitor.Enter(syncObject);151                    log.Add("waiting");152                    waiting = true;153                    Monitor.Wait(syncObject);154                    log.Add("received pulse");155                    Monitor.Exit(syncObject);156                });157                Task t2 = Task.Run(async () =>158                {159                    while (!waiting)160                    {161                        await Task.Delay(1);162                    }163                    Monitor.Enter(syncObject);164                    Monitor.Pulse(syncObject);165                    log.Add("pulsed");166                    Monitor.Exit(syncObject);167                });168                await Task.WhenAll(t1, t2);169                string expected = "waiting, pulsed, received pulse";170                string actual = string.Join(", ", log);171                Specification.Assert(expected == actual, "ControlledMonitor out of order, '{0}' instead of '{1}'", actual, expected);172            },173            this.GetConfiguration());174        }175        private class SignalData176        {177            private readonly object SyncObject;178            internal bool Signalled;179            internal SignalData()180            {181                this.SyncObject = new object();182                this.Signalled = false;183            }184            internal void Signal()185            {186                using var monitor = SynchronizedBlock.Lock(this.SyncObject);187                this.Signalled = true;188                monitor.Pulse();189            }190            internal void Wait()191            {192                using var monitor = SynchronizedBlock.Lock(this.SyncObject);193                while (!this.Signalled)194                {195                    bool result = monitor.Wait();196                    Assert.True(result, "Wait returned false.");197                }198            }199            internal void ReentrantLock()200            {201                Debug.WriteLine("Entering lock on task {0}.", GetCurrentTaskId());202                using var monitor = SynchronizedBlock.Lock(this.SyncObject);203                Debug.WriteLine("Entered lock on task {0}.", GetCurrentTaskId());204                this.DoLock();205            }206            internal void DoLock()207            {208                using var monitor = SynchronizedBlock.Lock(this.SyncObject);209                Debug.WriteLine("Re-entered lock from the same task {0}.", GetCurrentTaskId());210            }211            internal void ReentrantWait()212            {213                Debug.WriteLine("Entering lock on task {0}.", GetCurrentTaskId());214                using var monitor = SynchronizedBlock.Lock(this.SyncObject);215                Debug.WriteLine("Entered lock on task {0}.", GetCurrentTaskId());216                this.DoWait();217            }218            internal void DoWait()219            {220                using var monitor = SynchronizedBlock.Lock(this.SyncObject);221                Debug.WriteLine("Re-entered lock from the same task {0}.", GetCurrentTaskId());222                Debug.WriteLine("Task {0} is now waiting...", GetCurrentTaskId());223                this.Wait();224                Debug.WriteLine("Task {0} received the signal.", GetCurrentTaskId());225            }226            internal static int GetCurrentTaskId() => Task.CurrentId ?? 0;227        }228    }229}...

Enter

Using AI Code Generation

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Enter

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Coyote;4using Microsoft.Coyote.Actors;5using Microsoft.Coyote.Tasks;6{7    {8        public static void Main()9        {10            CoyoteRuntime runtime = null;11            {12                runtime = CoyoteRuntime.Create();13                runtime.RegisterMonitor(typeof(Monitor));14                runtime.CreateActor(typeof(Actor));15                runtime.Run();16            }17            {18                runtime?.Dispose();19            }20        }21    }22    {23        [OnEventDoAction(typeof(UnitEvent), nameof(OnStart))]24        private class Init : State { }25        private void OnStart()26        {27            Monitor.Enter(this.Id, nameof(OnStart));28        }29    }30    {31        [OnEventGotoState(typeof(UnitEvent), typeof(Init))]32        private class Init : State { }33        [OnEventDoAction(typeof(UnitEvent), nameof(OnStart))]34        private class Start : State { }35        private void OnStart()36        {37            this.Assert(false, "Monitor assertion failed.");38        }39    }40}41using System;42using System.Threading.Tasks;43using Microsoft.Coyote;44using Microsoft.Coyote.Actors;45using Microsoft.Coyote.Tasks;46{47    {48        public static void Main()49        {50            CoyoteRuntime runtime = null;51            {52                runtime = CoyoteRuntime.Create();53                runtime.RegisterMonitor(typeof(Monitor));54                runtime.CreateActor(typeof(Actor));55                runtime.Run();56            }57            {58                runtime?.Dispose();59            }60        }61    }62    {63        [OnEventDoAction(typeof(UnitEvent), nameof(OnStart))]64        private class Init : State { }65        private void OnStart()66        {67            Monitor.Assert(false, "Monitor assertion failed.");68        }69    }70    {71        [OnEventGotoState(typeof(UnitEvent), typeof(Init))]

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