NAME

       PAPI_read_counters -

       Read and reset counters.

SYNOPSIS

Detailed Description

       @par C Interface:
       int PAPI_read_counters( long long *values, int array_len );

       Parameters:
           *values an array to hold the counter values of the counting events
           arry_len the number of items in the *events array

       Precondition:
           These calls assume an initialized PAPI library and a properly added event set.

       Postcondition:
           The counters are reset and left running after the call.

       Return values:
           PAPI_EINVAL One or more of the arguments is invalid.
           PAPI_ESYS A system or C library call failed inside PAPI, see the errno variable.

       PAPI_read_counters() copies the event counters into the array *values.

       do_100events();
       if ( PAPI_read_counters( values, num_hwcntrs ) != PAPI_OK )
           handlw_error(1);
       // values[0] now equals 100
       do_100events();
       if ( PAPI_accum_counters( values, num_hwcntrs ) != PAPI_OK )
           handle_error(1);
       // values[0] now equals 200
       values[0] = -100;
       do_100events();
       if ( PAPI_accum_counters(values, num_hwcntrs ) != PAPI_OK )
           handle_error();
       // values[0] now equals 0
        *

       See Also:
           PAPI_set_opt() PAPI_start_counters()

       Fortran Interface:
           #include 'fpapi.h'
            PAPIF_read_counters( C_LONG_LONG(*) values, C_INT array_len, C_INT check )

       See Also:
           PAPI_read_counters

Author

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