[#BloombergLP-balb-PipeControlChannel-2constructor-01]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balb.adoc[balb]::xref:BloombergLP/balb/PipeControlChannel.adoc[PipeControlChannel]::PipeControlChannel
:relfileprefix: ../../../
:mrdocs:

Create a pipe control mechanism that dispatches to the given callback.

== Synopsis

Declared in `<balb_pipecontrolchannel.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
PipeControlChannel(
    xref:BloombergLP/balb/PipeControlChannel/ControlCallback.adoc[ControlCallback] const& callback,
    xref:BloombergLP/bslma/Allocator.adoc[bslma::Allocator]* basicAllocator = 0);
----

== Description

Create a pipe control mechanism that dispatches messages to the specified `callback`. Optionally specify `basicAllocator` to supply memory. If `basicAllocator` is zero, the currently installed default allocator is used. The permission bit mask of the underlying named pipe defaults to `k_DEFAULT_PERMISSIONS` (0666, i.e., read/write for everyone) and may be changed by calling `setPermissions` before `start`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *callback*
| functor invoked for each control message
| *basicAllocator*
| memory allocator; null uses the default
|===


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