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nng_stat_unit.3.adoc

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nng_version(3)

NAME

nng_stat_value - get statistic value

SYNOPSIS

#include <nng/nng.h>

typedef struct nng_stat nng_stat;

enum {
        NNG_UNIT_NONE,
        NNG_UNIT_BYTES,
        NNG_UNIT_MESSAGES,
        NNG_UNIT_MILLIS,
        NNG_UNIT_EVENTS
};

int nng_stat_unit(nng_stat *stat);

DESCRIPTION

The nng_stat_unit() function returns the unit of quantity measured by the statistic stat.

The returned value will be one of the following values:

NNG_UNIT_NONE

There are no particular units measured. In some cases there may be units, but the type of the unit will be obvious from the name (see nng_stat_name()) of the statistic.

NNG_UNIT_BYTES

The statistic is a count of bytes.

NNG_UNIT_MESSAGES

The statistic is a count of messages. Typically, one message corresponds to a single nng_msg structure.

NNG_UNIT_MILLIS

The statistic is a count of milliseconds.

NNG_STAT_EVENTS

The statistic is a count of some other type of event.

For statistics that are neither NNG_STAT_COUNTER nor NNG_STAT_LEVEL type (see nng_stat_type()), the unit will generally be NNG_UNIT_NONE.

Tip
 Normally rates can be calculated for NNG_STAT_COUNTER values for any of these units, but for NNG_UNIT_MILLIS rate calculations are generally meaningless.

RETURN VALUES

The units measured by stat.

ERRORS

None.