freebsd man page for pmc_set

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