IRB_REQ_ASYNC_LOCK - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// 1394.h

typedef struct _IRB_REQ_ASYNC_LOCK {
  IO_ADDRESS DestinationAddress;
  ULONG      nNumberOfArgBytes;
  ULONG      nNumberOfDataBytes;
  ULONG      fulTransactionType;
  ULONG      fulFlags;
  ULONG      Arguments[2];
  ULONG      DataValues[2];
  PVOID      pBuffer;
  ULONG      ulGeneration;
  UCHAR      chPriority;
  UCHAR      nSpeed;
  UCHAR      tCode;
  UCHAR      Reserved;
} IRB_REQ_ASYNC_LOCK;
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Windows Driver Kit DDI reference (ns-1394-_irb_req_async_lock)

_IRB_REQ_ASYNC_LOCK structure

Description

This structure contains the fields necessary for the 1394 stack to carry out an asynchronous lock request.

Members

DestinationAddress

Specifies the 1394 64-bit destination address for this read operation. The driver only needs to fill in the IA_Destination_Offset member of u.AsyncLock.DestinationAddress; the bus driver fills in the IA_Destination_ID member. See IO_ADDRESS for the structure description.

nNumberOfArgBytes

Specifies the number of argument bytes used in performing this lock operation. May be zero, 4 or 8. See the u.AsyncLock.fulTransactionType member for details.

nNumberOfDataBytes

Specifies the number of data bytes used in performing this lock operation. May be 4 or 8. See the u.AsyncLock.fulTransactionType member for details.

fulTransactionType

Specifies which atomic transaction to execute on the 1394 node. The following function types are supported.

fulTransactionType Description
LOCK_TRANSACTION_MASK_SWAP For each bit in the original value and the matching argument, reset the bit to be the same as the corresponding bit in the data value. The nNumberOfArgBytes and nNumberOfDataBytes members of u.AsyncLock must be the same.
LOCK_TRANSACTION_COMPARE_SWAP If the original value and argument match, replace the original value with the data value. The nNumberOfArgBytes and nNumberOfDataBytes members of u.AsyncLock must be the same.
LOCK_TRANSACTION_FETCH_ADD Add the data value to the original value. Big-endian addition is performed. The argument value is not used and the nNumberOfArgBytes member of u.AsyncLock must be zero.
LOCK_TRANSACTION_LITTLE_ADD Add the data value to the original value. Little-endian addition is performed. The argument value is not used and the nNumberOfArgBytes member of u.AsyncLock must be zero.
LOCK_TRANSACTION_BOUNDED_ADD If the original value and the argument differ, add the data value to the original value. The nNumberOfArgBytes and nNumberOfDataBytes members of u.AsyncLock must be the same.
LOCK_TRANSACTION_WRAP_ADD If the original value and the argument differ, add the data value to original value. Otherwise, replace the original value with the data value. The nNumberOfArgBytes and nNumberOfDataBytes members of u.AsyncLock must be the same.

fulFlags

Not currently used. Drivers should set this to zero.

Arguments

Specifies the arguments used in this lock operation.

DataValues

Specifies the data values used in this lock operation.

pBuffer

Points to a buffer that receives lock data values returned from the node. The size of the buffer must be at least equal to the u.AsyncLock.nNumberOfDataBytes member.

ulGeneration

Specifies the bus reset generation as known by the device driver who submitted this asynchronous request. If the generation count specified does not match the actual generation of the bus, then this request is returned with an error.

chPriority

Reserved.

nSpeed

Reserved.

tCode

Reserved.

Reserved

Reserved.

View the official Windows Driver Kit DDI reference

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