mmv_inc_value(3) — Linux manual page

MMV_INC_VALUE(3)        Library Functions Manual        MMV_INC_VALUE(3)

NAME

       mmv_inc, mmv_inc_value, mmv_inc_atomvalue - update a value in a
       Memory Mapped Value file

C SYNOPSIS

       #include <pcp/pmapi.h>
       #include <pcp/mmv_stats.h>

       void mmv_inc_value(void *addr, pmAtomValue *av, double inc);
       void mmv_inc_atomvalue(void *addr, pmAtomValue *av, pmAtomValue
       *inc);

       cc ... -lpcp_mmv -lpcp

DESCRIPTION

       mmv_inc_value and mmv_inc_atomvalue provide convenient ways of
       updating a metric av previously returned by the
       mmv_lookup_value_desc(3) interface.  addr is the address returned
       from mmv_stats_init(3).

       These interfaces are most commonly used with counter type
       metrics.  Refer to mmv_set_value(3) for a mechanism suited to
       instantaneous and discrete metrics.

       With mmv_inc_atomvalue the value provided via the inc pointer
       must match the type of the metric, and will be added to the
       previous value of the metric.

       In the case of mmv_inc_value the value of inc is internally cast
       to match the type of the metric and then added to the previous
       value of the metric.

SEE ALSO

       mmv_set_value(3), mmv_stats_init(3), mmv_lookup_value_desc(3) and
       mmv(5).

COLOPHON

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       ⟨https://github.com/performancecopilot/pcp.git⟩ on 2024-06-14.
       (At that time, the date of the most recent commit that was found
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Performance Co-Pilot                                    MMV_INC_VALUE(3)

Pages that refer to this page: mmv_lookup_value_desc(3), mmv_set_value(3), mmv_stats_init(3), mmv_stats_registry(3)

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