SemaphoreSlim Class
A lightweight alternative to Semaphore that limits the number of threads that can access a resource or pool of resources concurrently.
Assembly: mscorlib (in mscorlib.dll)
The SemaphoreSlim type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | SemaphoreSlim(Int32) | Initializes a new instance of the SemaphoreSlim class, specifying the initial number of requests that can be granted concurrently. |
![]() | SemaphoreSlim(Int32, Int32) | Initializes a new instance of the SemaphoreSlim class, specifying the initial and maximum number of requests that can be granted concurrently. |
| Name | Description | |
|---|---|---|
![]() | AvailableWaitHandle | Returns a WaitHandle that can be used to wait on the semaphore. |
![]() | CurrentCount | Gets the number of threads that will be allowed to enter the SemaphoreSlim. |
| Name | Description | |
|---|---|---|
![]() | Dispose() | Releases all resources used by the current instance of the SemaphoreSlim class. |
![]() | Dispose(Boolean) | When overridden in a derived class, releases the unmanaged resources used by the SemaphoreSlim, and optionally releases the managed resources. |
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | Release() | Exits the SemaphoreSlim once. |
![]() | Release(Int32) | Exits the SemaphoreSlim a specified number of times. |
![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
![]() | Wait() | Blocks the current thread until it can enter the SemaphoreSlim. |
![]() | Wait(CancellationToken) | Blocks the current thread until it can enter the SemaphoreSlim, while observing a CancellationToken. |
![]() | Wait(Int32) | Blocks the current thread until it can enter the SemaphoreSlim, using a 32-bit signed integer that specifies the timeout. |
![]() | Wait(TimeSpan) | Blocks the current thread until it can enter the SemaphoreSlim, using a TimeSpan to specify the timeout. |
![]() | Wait(Int32, CancellationToken) | Blocks the current thread until it can enter the SemaphoreSlim, using a 32-bit signed integer that specifies the timeout, while observing a CancellationToken. |
![]() | Wait(TimeSpan, CancellationToken) | Blocks the current thread until it can enter the SemaphoreSlim, using a TimeSpan that specifies the timeout, while observing a CancellationToken. |
The SemaphoreSlim provides a lightweight semaphore class that doesn't use Windows kernel semaphores.
Note |
|---|
The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: Synchronization | ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes. |
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
