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libcpc(3lib) [opensolaris man page]

libcpc(3LIB)							Interface Libraries						      libcpc(3LIB)

NAME
libcpc - CPU performance counter library SYNOPSIS
cc [ flag... ] file... -lcpc [ library... ] DESCRIPTION
Functions in this library provide access to CPU performance counters on platforms that contain the appropriate hardware. INTERFACES
The shared object libcpc.so.1 provides the public interfaces defined below. See Intro(3) for additional information on shared object inter- faces. cpc_access cpc_bind_cpu cpc_bind_curlwp cpc_bind_event cpc_bind_pctx cpc_buf_add cpc_buf_copy cpc_buf_create cpc_buf_destroy cpc_buf_get cpc_buf_hrtime cpc_buf_set cpc_buf_sub cpc_buf_tick cpc_buf_zero cpc_caps cpc_cciname cpc_close cpc_cpuref cpc_count_sys_events cpc_count_usr_events cpc_disable cpc_enable cpc_event_accum cpc_event_diff cpc_eventtostr cpc_getcciname cpc_getcpuref cpc_getcpuver cpc_getnpic cpc_getusage cpc_npic cpc_open cpc_pctx_bind_event cpc_pctx_invalidate cpc_pctx_rele cpc_pctx_take_sample cpc_rele cpc_request_preset cpc_set_add_request cpc_set_create cpc_set_destroy cpc_set_restart cpc_set_sample cpc_seterrfn cpc_seterrhndlr cpc_shared_bind_event cpc_shared_close cpc_shared_open cpc_shared_rele cpc_shared_take_sample cpc_strtoevent cpc_take_sample cpc_unbind cpc_version cpc_walk_attrs cpc_walk_events_all cpc_walk_events_pic cpc_walk_generic_events_all cpc_walk_generic_events_pic cpc_walk_names cpc_walk_requests FILES
/usr/lib/libcpc.so.1 shared object /usr/lib/64/libcpc.so.1 64-bit shared object ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcpcu | |MT-Level |Safe | +-----------------------------+-----------------------------+ SEE ALSO
cputrack(1), cpustat(1M), Intro(3), cpc(3CPC), attributes(5), xVM(5) NOTES
There is no support for access to performance counters in the xVM(5) environment. The -h operations for cputrack(1) are not enabled. SunOS 5.11 8 Oct 2008 libcpc(3LIB)

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cpc_shared_open(3CPC)													     cpc_shared_open(3CPC)

NAME
cpc_shared_open, cpc_shared_bind_event, cpc_shared_take_sample, cpc_shared_rele, cpc_shared_close - use CPU performance counters on proces- sors SYNOPSIS
cc [ flag... ] file... -lcpc [ library... ] #include <libcpc.h> int cpc_shared_open(void); int cpc_shared_bind_event(int fd, cpc_event_t *event, int flags); int cpc_shared_take_sample(int fd, cpc_event_t *event); int cpc_shared_rele(int fd); void cpc_shared_close(int fd); The cpc_shared_open() function allows the caller to access the hardware counters in such a way that the performance of the currently bound CPU can be measured. The function returns a file descriptor if successful. Only one such open can be active at a time on any CPU. The cpc_shared_bind_event(), cpc_shared_take_sample(), and cpc_shared_rele() functions are directly analogous to the corresponding cpc_bind_event(), cpc_take_sample(), and cpc_rele() functions described on the cpc_bind_event(3CPC)manual page, except that they operate on the counters of a particular processor. USAGE
If a thread wishes to access the counters using this interface, it must do so using a thread bound to an lwp, (see the THR_BOUND flag to thr_create(3C)), that has in turn bound itself to a processor using processor_bind(2). Unlike the cpc_bind_event(3CPC) family of functions, no counter context is attached to those lwps, so the performance counter samples from the processors reflects the system-wide usage, instead of per-lwp usage. The first successful invocation of cpc_shared_open() will immediately invalidate all existing performance counter context on the system, and prevent all subsequent attempts to bind counter context to lwps from succeeding anywhere on the system until the last caller invokes cpc_shared_close(). This is because it is impossible to simultaneously use the counters to accurately measure per-lwp and system-wide events, so there is an exclusive interlock between these uses. Access to the shared counters is mediated by file permissions on a cpc pseudo device. Only a user with the {PRIV_SYS_CONFIG} privilege is allowed to access the shared device. This control prevents use of the counters on a per-lwp basis to other users. The CPC_BIND_LWP_INHERIT and CPC_BIND_EMT_OVF flags are invalid for the shared interface. On success, the functions (except for cpc_shared_close()) return 0. On failure, the functions return -1 and set errno to indicate the rea- son. EACCES The caller does not have appropriate privilege to access the CPU performance counters system-wide. EAGAIN For cpc_shared_open(), this value implies that the counters on the bound cpu are busy because they are already being used to measure system-wide events by some other caller. EAGAIN Otherwise, this return value implies that the counters are not available because the thread has been unbound from the pro- cessor it was bound to at open time. Robust programs should be coded to expect this behavior, and should invoke cpc_shared_close(), before retrying the operation. EINVAL The counters cannot be accessed on the current CPU because the calling thread is not bound to that CPU using proces- sor_bind(2). ENOTSUP The caller has attempted an operation that is illegal or not supported on the current platform. ENXIO The current machine either has no performance counters, or has been configured to disallow access to them system-wide. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ |Interface Stability |Obsolete | +-----------------------------+-----------------------------+ processor_bind(2), cpc(3CPC), cpc_bind_cpu(3CPC), cpc_bind_event(3CPC), cpc_set_sample(3CPC), cpc_unbind(3CPC), libcpc(3LIB), thr_cre- ate(3C), attributes(5) The cpc_shared_open(), cpc_shared_bind_event(), cpc_shared_take_sample(), cpc_shared_rele(), and cpc_shared_close() functions exist for binary compatibility only. Source containing these functions will not compile. These functions are obsolete and might be removed in a future release. Applications should use cpc_bind_cpu(3CPC), cpc_set_sample(3CPC), and cpc_unbind(3CPC) instead. 28 Mar 2005 cpc_shared_open(3CPC)

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