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Determine hz and shift from sysconf(_SC_CLK_TCK) when available

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This commit is contained in:
Miroslav Lichvar 2011-06-06 17:41:14 +02:00
parent 9fd8f76fa0
commit eca08a281c
1 changed files with 35 additions and 9 deletions
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26
sys_linux.c
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@ -872,6 +872,30 @@ guess_hz_and_shift_hz(int tick, int *hz, int *shift_hz)
/* ================================================== */
static int
get_hz_and_shift_hz(int *hz, int *shift_hz)
{
#ifdef _SC_CLK_TCK
if ((*hz = sysconf(_SC_CLK_TCK)) < 1) {
return 0;
}
if (*hz == 100) {
*shift_hz = 7;
return 1;
}
for (*shift_hz = 1; (*hz >> *shift_hz) > 1; (*shift_hz)++)
;
return 1;
#else
return 0;
#endif
}
/* ================================================== */
static int
kernelvercmp(int major1, int minor1, int patch1,
int major2, int minor2, int patch2)
@ -900,6 +924,7 @@ get_version_specific_details(void)
struct tmx_params tmx_params;
struct utsname uts;
if (!get_hz_and_shift_hz(&hz, &shift_hz)) {
TMX_ReadCurrentParams(&tmx_params);
guess_hz_and_shift_hz(tmx_params.tick, &hz, &shift_hz);
@ -913,6 +938,7 @@ get_version_specific_details(void)
tmx_params.tick, tmx_params.freq, tmx_params.dfreq, tmx_params.offset, hz, shift_hz);
#endif
}
}
CNF_GetLinuxHz(&set_config_hz, &config_hz);
if (set_config_hz) hz = config_hz;