EVT_WDF_INTERRUPT_SYNCHRONIZE callback function (wdfinterrupt.h)

[Applies to KMDF and UMDF]

A driver's EvtInterruptSynchronize event callback function performs operations that must be synchronized with an EvtInterruptIsr callback function.

Syntax

EVT_WDF_INTERRUPT_SYNCHRONIZE EvtWdfInterruptSynchronize;

BOOLEAN EvtWdfInterruptSynchronize(
  [in] WDFINTERRUPT Interrupt,
  [in] WDFCONTEXT Context
)
{...}

Parameters

[in] Interrupt

A handle to a framework interrupt object.

[in] Context

Driver-supplied information that the driver specifies when it calls WdfInterruptSynchronize.

Return value

The EvtInterruptSynchronize callback function must return TRUE if the operation succeeds. Otherwise, this function must return FALSE.

Remarks

To execute an EvtInterruptSynchronize callback function, the driver must call WdfInterruptSynchronize.

If the driver has configured the interrupt object for handling at the device's IRQL (DIRQL), then before calling the EvtInterruptSynchronize callback function, the framework raises the processor's interrupt request level to DIRQL and acquires the spin lock that the driver specified in the interrupt object's WDF_INTERRUPT_CONFIG structure.

As a result, while an EvtInterruptSynchronize callback function is executing, the interrupt object's EvtInterruptIsr callback function (and any other code that executes at DIRQL while holding the spin lock) cannot execute.

EvtInterruptSynchronize callback functions must be designed so that they execute for only a short period of time. They are typically used to access interrupt data that is also accessed by an interrupt object's other EvtInterruptSynchronize or EvtInterruptIsr callback functions.

Beginning with version 1.11 of KMDF, your driver can provide passive-level interrupt handling. If the driver has requested passive-level interrupt handling, then before calling the EvtInterruptSynchronize function at IRQL = PASSIVE_LEVEL, the framework acquires the passive-level interrupt lock that the driver configured in the interrupt object's WDF_INTERRUPT_CONFIG structure.

For more information about the EvtInterruptSynchronize callback function, see Synchronizing Interrupt Code.

For more information about handling interrupts in framework-based drivers, see Handling Hardware Interrupts.

Requirements

See also

EvtInterruptIsr

WDF_INTERRUPT_CONFIG

WdfInterruptSynchronize