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-->A driver that requires delayed processing can use a work item, which contains a pointer to a driver callback routine that performs the actual processing. The driver queues the work item, and a system worker thread removes the work item from the queue and runs the driver's callback routine. The system maintains a pool of these system worker threads, which are system threads that each process one work item at a time.
Thd(thread Technology) Laptops & Desktops Driver Download For Windows 8
The driver associates a WorkItem callback routine with the work item. When the system worker thread processes the work item, it calls the associated WorkItem routine. In Windows Vista and later versions of Windows, a driver can instead associate a WorkItemEx routine with a work item. WorkItemEx takes parameters that are different from the parameters that WorkItem takes.
WorkItem and WorkItemEx routines run in a system thread context. If a driver dispatch routine can run in a user-mode thread context, that routine can call a WorkItem or WorkItemEx routine to perform any operations that require a system thread context.
To use a work item, a driver performs the following steps:
Allocate and initialize a new work item.
The system uses an IO_WORKITEM structure to hold a work item. To allocate a new IO_WORKITEM structure and initialize it as a work item, the driver can call IoAllocateWorkItem. In Windows Vista and later versions of Windows, the driver can alternatively allocate its own IO_WORKITEM structure, and call IoInitializeWorkItem to initialize the structure as a work item. (The driver should call IoSizeofWorkItem to determine the number of bytes that are necessary to hold a work item.)
Associate a callback routine with the work item, and queue the work item so that it will be processed by a system worker thread.
To associate a WorkItem routine with the work item and queue the work item, the driver should call IoQueueWorkItem. To instead associate a WorkItemEx routine with the work item and queue the work item, the driver should call IoQueueWorkItemEx.
After the work item is no longer required, free it.
A work item that was allocated by IoAllocateWorkItem should be freed by IoFreeWorkItem. A work item that was initialized by IoInitializeWorkItem must be uninitialized by IoUninitializeWorkItem before it can be freed.
The work item can only be uninitialized or freed when the work item is not currently queued. The system dequeues the work item before it calls the work item's callback routine, so IoFreeWorkItem and IoUninitializeWorkItem can be called from within the callback.
A DPC that needs to initiate a processing task that requires lengthy processing or that makes a blocking call should delegate the processing of that task to one or more work items. While a DPC runs, all threads are prevented from running. Additionally, a DPC, which runs at IRQL = DISPATCH_LEVEL, must not make blocking calls. However, the system worker thread that processes a work item runs at IRQL = PASSIVE_LEVEL. Thus, the work item can contain blocking calls. For example, a system worker thread can wait on a dispatcher object.
Because the pool of system worker threads is a limited resource, WorkItem and WorkItemEx routines can be used only for operations that take a short period of time. If one of these routines runs for too long (if it contains an indefinite loop, for example) or waits for too long, the system can deadlock. Therefore, if a driver requires long periods of delayed processing, it should instead call PsCreateSystemThread to create its own system thread.
Do not call IoQueueWorkItem or IoQueueWorkItemEx to queue a work item that is already in the queue. Doing so can cause corruption of system data structures. If your driver queues the same work item each time a particular driver routine runs, you can use the following technique to avoid queuing the work item a second time if it is already in the queue:
- The driver maintains a list of tasks for the worker routine.
- This task list is available in the context that is supplied to the worker routine. The worker routine and any driver routines that modify the task list synchronize their access to the list.
- Each time the worker routine runs, it performs all the tasks in the list, and removes each task from the list as the task is completed.
- When a new task arrives, the driver adds this task to the list. The driver queues the work item only if the task list was previously empty.
The system worker thread removes the work item from the queue before it calls the worker thread. Thus, a driver thread can safely queue the work item again as soon as the worker thread starts to run.