Flow of Control for Cancel-Safe IRP Queuing

Updated: May 4, 2004

File name: IoCsqArt.doc
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This paper provides information about cancel-safe interrupt request packet (IRP) queues for the Windows family of operating systems. It provides background information for driver writers who seek a greater understanding of how the new cancel-safe queue (CSQ) library and IoCsq routines implement IRP queuing, dequeuing, and cancellation. Included are flowcharts that show the flow of control during use of the cancel-safe IRP queuing routines (the IoCsq package).

This information applies for the following operating systems:
Windows Vista
Windows Server 2003
Windows XP
Windows 2000
Windows 98/ME

Included in this white paper:

• Initializing the Cancel-Safe IRP Queue Package

• Queuing an IRP

• Dequeuing an IRP

• Canceling an IRP