ThreadPoolBoundHandle.UnsafeAllocateNativeOverlapped Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Important
This API is not CLS-compliant.
Returns an unmanaged pointer to a NativeOverlapped structure, specifying a delegate that is invoked when the asynchronous I/O operation is complete, a user-provided object providing context, and managed objects that serve as buffers.
public:
System::Threading::NativeOverlapped* UnsafeAllocateNativeOverlapped(System::Threading::IOCompletionCallback ^ callback, System::Object ^ state, System::Object ^ pinData);[System.CLSCompliant(false)]
public System.Threading.NativeOverlapped* UnsafeAllocateNativeOverlapped (System.Threading.IOCompletionCallback callback, object? state, object? pinData);[<System.CLSCompliant(false)>]
member this.UnsafeAllocateNativeOverlapped : System.Threading.IOCompletionCallback * obj * obj -> nativeptr<System.Threading.NativeOverlapped>Parameters
- callback
- IOCompletionCallback
An IOCompletionCallback delegate that represents the callback method invoked when the asynchronous I/O operation completes.
- state
- Object
A user-provided object that distinguishes this NativeOverlapped from other NativeOverlapped instances. Can be null.
- pinData
- Object
An object or array of objects representing the input or output buffer for the operation. Each object represents a buffer, for example an array of bytes. Can be null.
Returns
An unmanaged pointer to a NativeOverlapped structure.
- Attributes
Exceptions
callback is null.
This method was called after the ThreadPoolBoundHandle was disposed.
Remarks
The unmanaged pointer returned by this method can be passed to the operating system in overlapped I/O operations. The NativeOverlapped structure is fixed in physical memory until FreeNativeOverlapped(NativeOverlapped*) is called.
The buffer or buffers specified in pinData must be the same as those passed to the unmanaged operating system function that performs the asynchronous I/O.
ExecutionContext is not flowed to the invocation of the callback.
Note
The buffers specified in pinData are pinned for the duration of the I/O operation.
