Update a value in a memory mapped value file
#include <pcp/pmapi.h>
#include <pcp/mmv_stats.h>
void mmv_inc_value(void *addr, pmAtomValue *val, double inc);
cc ... -lpcp_mmv -lpcp
mmv_inc_value provides a convenient way of updating a value returned by the mmv_lookup_value_desc. addr is the address returned from mmv_stats_init().
The value of the inc is internally cast to match the type of the metric and then added to the previous value of the metric.