Types of I/OĪpplications have several options for the I/O requests they issue. ![]() Processing varies further depending on whether the caller specified synchronous or asynchronous I/O, so we'll begin our discussion of I/O types with these two then move on to others. The stages vary depending on whether the request is destined for a device operated by a single-layered driver or for a device reached through a multilayered driver. I/O requests pass through several predictable stages of processing. ![]() Now that we've covered the structure and types of drivers and the data structures that support them, let's look at how I/O requests flow through the system.
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