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Write-through to Remote Clients
The write-through mode of a named pipe handle affects the behavior of
byte-type pipes when data is transmitted across a network. To enable write-through mode
for a named pipe handle, a process specifies the FILE_FLAG_WRITE_THROUGH flag
in the CreateNamedPipe function for a server process or in the CreateFile function for a client process. If this flag is not specified, write-through
mode is disabled. The write-through mode of a pipe handle cannot be changed
after the pipe handle has been created. The write-through mode can be different for
server and client handles to the same pipe instance.
If write-through mode is not enabled, the system enhances the efficiency of
network operations by buffering data until a minimum number of bytes have
accumulated or until a maximum time period has elapsed. Buffering enables multiple
write operations to be combined into a single network transmission. This means
that a write operation can be successfully completed after the data is in the
outbound buffer but before it is transmitted across the network.
A client process can use the SetNamedPipeHandleState function to control the number of bytes and the time-out period before
transmission for a pipe on which write-through mode is disabled.
If write-through mode is enabled, the transmission across the network is not
delayed and the write operation is not completed until the data is in the pipe
buffer on the remote machine. Write-through mode is useful for applications that
require synchronization for every write operation.
The system always performs write operations on message-type pipes as if
write-through mode were enabled.
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