NAME
pmUseContext - change current PMAPI context
C SYNOPSIS
#include <pcp/pmapi.h>
int pmUseContext(int handle)
cc ... -lpcp
DESCRIPTION
An application using the Performance Metrics Application Programming
Interface (PMAPI) may manipulate several concurrent contexts, each
associated with a source of performance metrics, e.g. pmcd(1) on some
host, or an archive log of performance metrics as created by
pmlogger(1).
Calling pmUseContext causes the current PMAPI context to be set to the
context identified by handle. The value of handle must be one returned
from an earlier call to pmNewContext(3) or pmDupContext(3).
Below the PMAPI, all contexts used by an application are saved in their
most recently modified state, so pmUseContext restores the context to
the state it was in the last time the context was used, not the state
of the context when it was established.
SEE ALSO
PMAPI(3), pmDestroyContext(3), pmDupContext(3), pmNewContext(3) and
pmWhichContext(3).
DIAGNOSTICS
PM_ERR_NOCONTEXT
handle does not identify a valid PMAPI context