Adaptive Time-outs in UMDF
The Windows guidelines for I/O completion and cancellation require that drivers:
Support cancellation for I/O requests that might take an indefinite period of time to complete.
Complete I/O requests within a reasonable period—generally, 10 seconds or less—after cancellation.
Do not block I/O threads for an unreasonable period while performing I/O. UMDF I/O threads are a limited resource, so blocking on such a thread for a long time can decrease driver performance.
To aid user-mode drivers in conforming to these guidelines, UMDF supports adaptive time-outs. UMDF tracks the progress on critical I/O operations that can hold up the system if delayed. Critical operations include cleanup, close, cancellation, and Plug and Play ...
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