[#XLOG_EVERY_N_EXACT]
= XLOG_EVERY_N_EXACT
:mrdocs:

Similar to XLOG(...) except only log a message every

== Synopsis

Declared in `<folly/logging/xlog.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
#define XLOG_EVERY_N_EXACT(level, n, ...)

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== Description

The internal counter is process‐global and threadsafe and increments are atomic. The over‐logging and under‐logging schenarios of XLOG_EVERY_N(...) are avoided, traded off for the performance degradation of atomic‐rmw operations.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *n*
| invocations, exactly.
| *level*
| The `folly::LogLevel` value at which to log.
|===


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