NAME<\/a> __ppc_get_timebase, __ppc_get_timebase_freq \u2212 get the current value #include uint64_t __ppc_get_timebase(void)<\/b><\/p>\n uint64_t __ppc_get_timebase_freq(void);<\/b><\/p>\n __ppc_get_timebase<\/b>() reads the current value of the Time Base Register and returns its value, while __ppc_get_timebase_freq<\/b>() returns the frequency in which the Time Base Register is updated.<\/p>\n The Time Base Register is a 64-bit register provided by Power Architecture processors. It stores a monotonically incremented value that is updated at a system-dependent frequency that may be different from the processor frequency.<\/p>\n __ppc_get_timebase<\/b>() returns a 64-bit unsigned integer that represents the current value of the Time Base Register.<\/p>\n __ppc_get_timebase_freq<\/b>() returns a 64-bit unsigned integer that represents the frequency at which the Time Base Register is updated.<\/p>\n GNU C Library support for __ppc_get_timebase<\/b>() has been provided since version 2.16 and __ppc_get_timebase_freq<\/b>() has been available since version 2.17.<\/p>\n Both functions are nonstandard GNU extensions.<\/p>\n The following program will calculate the time, in microseconds, spent between two calls to __ppc_get_timebase<\/b>().<\/p>\n Program source<\/b> \/* Maximum value of the Time Base Register: 2^60 \u2212 1. int uint64_t freq = __ppc_get_timebase_freq(); tb1 = __ppc_get_timebase();<\/p>\n \/\/ Do some stuff…<\/p>\n tb2 = __ppc_get_timebase();<\/p>\n if (tb2 > tb1) { printf(“Elapsed time = %1.2f usecsn”, exit(EXIT_SUCCESS);
SYNOPSIS<\/a>
DESCRIPTION<\/a>
RETURN VALUE<\/a>
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CONFORMING TO<\/a>
EXAMPLES<\/a>
SEE ALSO<\/a>
COLOPHON<\/a> <\/p>\n
\nNAME <\/a> <\/h2>\n
of the Time Base Register on Power architecture and its frequency.<\/p>\nSYNOPSIS <\/a> <\/h2>\n
DESCRIPTION <\/a> <\/h2>\n
RETURN VALUE <\/a> <\/h2>\n
VERSIONS <\/a> <\/h2>\n
CONFORMING TO <\/a> <\/h2>\n
EXAMPLES <\/a> <\/h2>\n
#include
#include
#include
#include
#include
Source: POWER ISA. bodies\/ usr\/
#define MAX_TB 0xFFFFFFFFFFFFFFF<\/p>\n
main(void)
{
uint64_t tb1, tb2, diff;<\/p>\n
printf(“Time Base frequency = %”PRIu64″ Hzn”, freq);<\/p>\n
diff = tb2 \u2212 tb1;
} else {
\/bin \/boot \/dead.letter \/dev \/etc \/home \/initrd \/lib \/lib64 \/lost+found \/media \/mnt \/opt \/proc \/release-notes.html \/release-notes.txt \/root \/run \/sbin \/srv \/sys \/tmp \/usr \/var Treat Time Base Register overflow. bodies\/ usr\/
diff = (MAX_TB \u2212 tb2) + tb1;
}<\/p>\n
(double) diff bodies manpages.csv script_extrae_body.sh script.sh usr 1000000 \/ freq );<\/p>\n
}<\/p>\nSEE ALSO <\/a> <\/h2>\n