System.Threading.ThreadPool.UnsafeQueueUserWorkItem Method

Queues the specified delegate to the thread pool, but does not propagate the calling stack to the worker thread.

Syntax

public static bool UnsafeQueueUserWorkItem (WaitCallback callBack, object state)

Parameters

callBack
A System.Threading.WaitCallback that represents the delegate to invoke when a thread in the thread pool picks up the work item.
state
The object that is passed to the delegate when serviced from the thread pool.

Returns

true if the method succeeds; OutOfMemoryException is thrown if the work item could not be queued.

Remarks

Unlike the ThreadPool.QueueUserWorkItem(WaitCallback, object) method, ThreadPool.UnsafeQueueUserWorkItem(WaitCallback, object) does not propagate the calling stack to the worker thread. This allows code to lose the calling stack and thereby to elevate its security privileges.

Note:

Using ThreadPool.UnsafeQueueUserWorkItem(WaitCallback, object) could inadvertently open up a security hole. Code access security bases its permission checks on the permissions of all the callers on the stack. When work is queued on a thread pool thread using ThreadPool.UnsafeQueueUserWorkItem(WaitCallback, object), the stack of the thread pool thread will not have the context of the actual callers. Malicious code might be able exploit this to avoid permission checks.

Requirements

Namespace: System.Threading
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0