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- Deferred_Procedure_Call abstract "A Deferred Procedure Call (DPC) is a Microsoft Windows operating system mechanism which allows high-priority tasks (e.g. an interrupt handler) to defer required but lower-priority tasks for later execution. This permits device drivers and other low-level event consumers to perform the high-priority part of their processing quickly, and schedule non-critical additional processing for execution at a lower priority.DPCs are implemented by DPC objects which are created and initialized by the kernel when a device driver or some other kernel mode program issues requests for DPC. The DPC request is then added to the end of a DPC queue. Each processor has a separate DPC queue. DPCs have three priority levels: low, medium and high. By default, all DPCs are set to medium priority. When Windows drops to an IRQL of Dispatch/DPC level, it checks the DPC queue for any pending DPCs and executes them until the queue is empty or some other interrupt with a higher IRQL occurs.For example, when the clock interrupt is generated, the clock interrupt handler generally increments the counter of the current thread to calculate the total execution time of that thread, and decrements its quantum time remaining by 1. When the counter drops to zero, the thread scheduler has to be invoked to choose the next thread to be executed on that processor and dispatcher to perform a context switch. Since the clock interrupt occurs at a much higher IRQL, it will be desirable to perform this thread dispatching which is a less critical task at a later time when the processor's IRQL drops. So the clock interrupt handler requests a DPC object and adds it to the end of the DPC queue which will process the dispatching when the processor's IRQL drops to DPC/Dispatch level.When working with streaming audio or video that uses interrupts, DPCs are used to process the audio in each buffer as they stream in. If another DPC (from a poorly written driver) takes too long and another interrupt generates a new buffer of data, before the first one can be processed, a drop-out results.".
- Deferred_Procedure_Call wikiPageExternalLink ch03lev1sec3?portal=oreilly.
- Deferred_Procedure_Call wikiPageExternalLink ms789534.aspx.
- Deferred_Procedure_Call wikiPageID "12272308".
- Deferred_Procedure_Call wikiPageRevisionID "578349939".
- Deferred_Procedure_Call hasPhotoCollection Deferred_Procedure_Call.
- Deferred_Procedure_Call subject Category:Interrupts.
- Deferred_Procedure_Call subject Category:Subroutines.
- Deferred_Procedure_Call type Abstraction100002137.
- Deferred_Procedure_Call type Code106355894.
- Deferred_Procedure_Call type CodingSystem106353757.
- Deferred_Procedure_Call type Communication100033020.
- Deferred_Procedure_Call type Routine106582403.
- Deferred_Procedure_Call type Software106566077.
- Deferred_Procedure_Call type Subroutines.
- Deferred_Procedure_Call type Writing106359877.
- Deferred_Procedure_Call type WrittenCommunication106349220.
- Deferred_Procedure_Call comment "A Deferred Procedure Call (DPC) is a Microsoft Windows operating system mechanism which allows high-priority tasks (e.g. an interrupt handler) to defer required but lower-priority tasks for later execution.".
- Deferred_Procedure_Call label "DPC".
- Deferred_Procedure_Call label "Deferred Procedure Call".
- Deferred_Procedure_Call label "Deferred Procedure Call".
- Deferred_Procedure_Call sameAs Deferred_Procedure_Call.
- Deferred_Procedure_Call sameAs m.02vyg7y.
- Deferred_Procedure_Call sameAs Q3021214.
- Deferred_Procedure_Call sameAs Q3021214.
- Deferred_Procedure_Call sameAs Deferred_Procedure_Call.
- Deferred_Procedure_Call wasDerivedFrom Deferred_Procedure_Call?oldid=578349939.
- Deferred_Procedure_Call isPrimaryTopicOf Deferred_Procedure_Call.