NAME

pmc_start, pmc_stop — start and stop a PMC

LIBRARY

Performance Counters Library (libpmc, -lpmc)

SYNOPSIS

#include <pmc.h>

int
pmc_start(pmc_id_t pmc);

int
pmc_stop(pmc_id_t pmc);

DESCRIPTION

These functions are used to start and stop a PMC.

Function pmc_start() starts the PMC specified by argument pmc. If the specified PMC has process scope and has not been attached to any targets, it will be attached to the current process.

Function pmc_stop() stops the PMC specified by argument pmc.

RETURN VALUES

Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

ERRORS

A call to these functions may fail with the following errors:

[EDOOFUS]

Function pmc_start() specified a PMC that requires a log file and no log file was configured.

[EINVAL]

The specified PMC is in the process of being deleted.

[EINVAL]

Function pmc_stop() specified a PMC that was never started.

[ENXIO]

The specified PMC had system scope and its associated CPU was disabled or absent.

SEE ALSO

pmc(3), hwpmc(4)