cpc_version(3cpc) [opensolaris man page]
cpc_version(3CPC) CPU Performance Counters Library Functions cpc_version(3CPC) NAME
cpc_version - coordinate CPC library and application versions SYNOPSIS
cc [ flag... ] file... -lcpc [ library... ] #include <libcpc.h> uint_t cpc_version(uint_t version); DESCRIPTION
The cpc_version() function takes an interface version as an argument and returns an interface version as a result. Usually, the argument will be the value of CPC_VER_CURRENT bound to the application when it was compiled. RETURN VALUES
If the version requested is still supported by the implementation, cpc_version() returns the requested version number and the application can use the facilities of the library on that platform. If the implementation cannot support the version needed by the application, cpc_version() returns CPC_VER_NONE, indicating that the application will at least need to be recompiled to operate correctly on the new platform, and may require further changes. If version is CPC_VER_NONE, cpc_version() returns the most current version of the library. EXAMPLES
Example 1 Protect an application from using an incompatible library. The following lines of code protect an application from using an incompatible library: if (cpc_version(CPC_VER_CURRENT) == CPC_VER_NONE) { /* version mismatch - library cannot translate */ exit(1); } ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
cpc(3CPC), cpc_open(3CPC), libcpc(3LIB), attributes(5) NOTES
The cpc_version() function exists for binary compatibility only. Source containing this function will not compile. This function is obso- lete and might be removed in a future release. Applications should use cpc_open(3CPC) instead. The version number is used only to express incompatible semantic changes in the performance counter interfaces on the given platform within a single instruction set architecture, for example, when a new set of performance counter registers are added to an existing processor family that cannot be specified in the existing cpc_event_t data structure. SunOS 5.11 28 Mar 2005 cpc_version(3CPC)
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cpc_event(3CPC) CPU Performance Counters Library Functions cpc_event(3CPC) NAME
cpc_event - data structure to describe CPU performance counters SYNOPSIS
#include <libcpc.h> DESCRIPTION
The libcpc interfaces manipulate CPU performance counters using the cpc_event_t data structure. This structure contains several fields that are common to all processors, and some that are processor-dependent. These structures can be declared by a consumer of the API, thus the size and offsets of the fields and the entire data structure are fixed per processor for any particular version of the library. See cpc_version(3CPC) for details of library versioning. SPARC For UltraSPARC, the structure contains the following members: typedef struct { int ce_cpuver; hrtime_t ce_hrt; uint64_t ce_tick; uint64_t ce_pic[2]; uint64_t ce_pcr; } cpc_event_t; x86 For Pentium, the structure contains the following members: typedef struct { int ce_cpuver; hrtime_t ce_hrt; uint64_t ce_tsc; uint64_t ce_pic[2]; uint32_t ce_pes[2]; #define ce_cesr ce_pes[0] } cpc_event_t; The APIs are used to manipulate the highly processor-dependent control registers (the ce_pcr, ce_cesr, and ce_pes fields); the programmer is strongly advised not to reference those fields directly in portable code. The ce_pic array elements contain 64-bit accumulated counter values. The hardware registers are virtualized to 64-bit quantities even though the underlying hardware only supports 32-bits (UltraSPARC) or 40-bits (Pentium) before overflow. The ce_hrt field is a high resolution timestamp taken at the time the counters were sampled by the kernel. This uses the same timebase as gethrtime(3C). On SPARC V9 machines, the number of cycles spent running on the processor is computed from samples of the processor-dependent %tick regis- ter, and placed in the ce_tick field. On Pentium processors, the processor-dependent time-stamp counter register is similarly sampled and placed in the ce_tsc field. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
gethrtime(3C), cpc(3CPC), cpc_version(3CPC), libcpc(3LIB), attributes(5) SunOS 5.10 12 May 2003 cpc_event(3CPC)