[#SYNCHRONIZED_DUAL]
= SYNCHRONIZED_DUAL
:mrdocs:

NOTE: This API is deprecated. Use lock(), wlock(), rlock() or the withLock functions instead. In the future it will be marked with a deprecation attribute to emit build‐time warnings, and then it will be removed entirely.

== Synopsis

Declared in `<folly/Synchronized.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
#define SYNCHRONIZED_DUAL(n1, e1, n2, e2)

----

== Description

Synchronizes two Synchronized objects (they may encapsulate different data). Synchronization is done in increasing address of object order, so there is no deadlock risk.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *n1*
| Name bound to the first object's datum.
| *e1*
| The first `Synchronized` object.
| *n2*
| Name bound to the second object's datum.
| *e2*
| The second `Synchronized` object.
|===


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