CreateIoRing function (ioringapi.h)

Creates a new instance of an I/O ring submission/completion queue pair and returns a handle for referencing the IORING.

Syntax

HRESULT CreateIoRing(
  IORING_VERSION      ioringVersion,
  IORING_CREATE_FLAGS flags,
  UINT32              submissionQueueSize,
  UINT32              completionQueueSize,
  HIORING             *h
);

Parameters

ioringVersion

A UNIT32 representing the version of the I/O ring API the ring is created for. This value must be less than or equal to the value retrieved from a call to QueryIoRingCapabilities

flags

A value from the IORING_CREATE_FLAGS enumeration specifying creation flags.

submissionQueueSize

The requested minimum submission queue size. The system may round up the size as needed to ensure the actual size is a power of 2. You can get the actual allocated queue size by calling GetIoRingInfo. You can get the maximum submission queue size on the current system by calling QueryIoRingCapabilities.

completionQueueSize

The requested minimum size of the completion queue. The system will round this size up to a power of two that is no less than two times the actual submission queue size to allow for submissions while some operations are still in progress. You can get the actual allocated queue size by calling GetIoRingInfo.

h

Receives the resulting HIORING handle, if creation was successful. The returned HIORING ring must be closed by calling CloseIoRing, not CloseHandle, to release the underlying resources for the IORING.

Return value

An HRESULT, including but not limited to the following:

Value	Description
S_OK	Success.
IORING_E_UNKNOWN_VERSION	The version specified in ioringVersion is unknown.

Requirements

Requirement	Value
Minimum supported client	Windows Build 22000
Minimum supported server	Windows Build 22000
Header	ioringapi.h