Developing Drivers with the Windows® Driver Foundation

Synchronization Scope and I/O Callback Serialization

Concurrently active callbacks on the same object might require access to shared object-specific data or might share such data with helper functions. For example, a driver’s cleanup and cancellation callbacks often use the same data as its read, write, and device I/O control callbacks. A driver can set synchronization scope to manage concurrency among these functions.

Important

Neither UMDF nor KMDF serializes calls to I/O completion callbacks. Such callbacks can run concurrently with any other driver callbacks. If an I/O completion callback shares data with another I/O event callback and requires synchronized access to that data, the driver must explicitly acquire the appropriate locks.

Synchronization ...