cpc_npic(3CPC)					    CPU Performance Counters Library Functions					    cpc_npic(3CPC)

NAME

       cpc_npic,  cpc_caps,  cpc_cciname, cpc_cpuref, cpc_walk_events_all, cpc_walk_events_pic, cpc_walk_attrs - determine CPU performance counter
       configuration

SYNOPSIS

       cc [ flag... ] file... -lcpc [ library... ]
       #include <libcpc.h>

       const char *cpc_cciname(cpc_t *cpc);

       const char *cpc_cpuref(cpc_t *cpc);

       uint_t cpc_npic(cpc_t *cpc);

       uint_t cpc_caps(cpc_t *cpc);

       void cpc_walk_events_all(cpc_t *cpc, void *arg, void (*action)(void *arg, const char *event));

       void cpc_walk_events_pic(cpc_t *cpc, uint_t picno, void *arg, void (*action)(void *arg, uint_t picno, const char *event));

       void cpc_walk_attrs(cpc_t *cpc, void *arg, void (*action)(void *arg, const char *attr));

DESCRIPTION

       The cpc_cciname() function returns a printable description of the processor performance counter interfaces, for example, the string  Ultra-
       SPARC  III+  & IV. This name should not be assumed to be the same as the name the manufacturer might otherwise ascribe to the processor. It
       simply names the performance counter interfaces as understood by the system, and thus names the set of performance counter events that  can
       be described by that interface.

       The  cpc_cpuref()  function  returns a string that describes a reference work that should be consulted to (allow a human to) understand the
       semantics of the performance counter events that are known to the system. The string returned might be substantially longer than 80 charac-
       ters.  Callers printing to a terminal might want to insert line breaks as appropriate.

       The cpc_npic() function returns the number of performance counters accessible on the processor.

       The  cpc_caps()	function  returns a bitmap containing the bitwise inclusive-OR of zero or more flags that describe the capabilities of the
       processor. If CPC_CAP_OVERFLOW_INTERRUPT is present, the processor can generate an interrupt when a hardware performance counter overflows.
       If  CPC_CAP_OVERFLOW_PRECISE  is present, the processor can determine precisely which counter overflowed, thereby affecting the behavior of
       the overflow notification mechanism described in cpc_bind_curlwp(3CPC).

       The system maintains a list of performance counter events supported by the underlying processor. Some processors  are  able  to	count  all
       events  on all hardware counters, while other processors restrict certain events to be counted only on specific hardware counters. The sys-
       tem also maintains a list of processor-specific attributes that can be used for advanced configuration of the performance counter hardware.
       These  functions  allow	applications to determine what events and attributes are supported by the underlying processor. The reference work
       pointed to by cpc_cpuref() should be consulted to understand the reasons for and use of the attributes.

       The cpc_walk_events_all() function calls the action function on each element of a global event list. The action	function  is  called  with
       each  event  supported by the processor, regardless of which counter is capable of counting it. The action function is called only once for
       each event, even if that event can be counted on more than one counter.

       The cpc_walk_events_pic() function calls the action function with each event supported by the counter  indicated  by  the  picno  argument,
       where picno ranges from 0 to the value returned by cpc_npic().

       The  system  maintains a list of attributes that can be used to enable advanced features of the performance counters on the underlying pro-
       cessor. The cpc_walk_attrs() function calls the action function for each supported attribute name. See the reference material  as  returned
       by cpc_cpuref(3CPC) for the semantics use of attributes.

RETURN VALUES

       The cpc_cciname() function always returns a printable description of the processor performance counter interfaces.

       The cpc_cpuref() function always returns a string that describes a reference work.

       The cpc_npic() function always returns the number of performance counters accessible on the processor.

       The cpc_caps() function always returns a bitmap containing the bitwise inclusive-OR of zero or more flags that describe the capabilities of
       the processor.

       If the user-defined function specified by action is not called,	the  cpc_walk_events_all(),  cpc_walk_events_pic(),  and  cpc_walk_attrs()
       functions set errno to indicate the error.

ERRORS

       The cpc_walk_events_all(), cpc_walk_events_pic(), and cpc_walk_attrs() functions will fail if:

       ENOMEM	       There is not enough memory available.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cpc_bind_curlwp(3CPC), libcpc(3LIB), attributes(5)

SunOS 5.10							    30 Jan 2004 						    cpc_npic(3CPC)