pmc_set(3) [freebsd man page]

PMC_SET(3)						   BSD Library Functions Manual 						PMC_SET(3)

NAME

     pmc_set -- set the reload count of a sampling PMC

LIBRARY

     Performance Counters Library (libpmc, -lpmc)

SYNOPSIS

     #include <pmc.h>

     int
     pmc_set(pmc_id_t pmc, pmc_value_t value);

DESCRIPTION

     Function pmc_set() is used to set the reload value of sampling PMCs.  Argument pmc specified the handle a previously allocate sampling mode
     PMC.  Argument value specifies the reload count.

     Sampling PMCs will interrupt the CPU after the number of hardware events specified by the reload count are seen.  After the sampling inter-
     rupt is processed the underlying hardware will be reloaded with the specified count and the hardware automatically restarted by hwpmc(4).

     Function pmc_set() should be called on PMC in a quiescent state.

RETURN VALUES

     The pmc_set() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
     the error.

ERRORS

     A call to pmc_set() may fail with the following errors:

     [EINVAL]		The current process did not own a PMC with the specified handle.

     [EBUSY]		The specified PMC was already running.

SEE ALSO

     pmc(3), hwpmc(4)

BSD
								 November 25, 2007							       BSD

PMC_START(3)						   BSD Library Functions Manual 					      PMC_START(3)

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 tar-
     gets, 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)

BSD
								September 22, 2008							       BSD