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unix/cputime.c: Cache sc_clk_tck and check it for sanity.

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This commit is contained in:
Vladimir Serbinenko 2015-01-21 10:28:52 +01:00
parent 69aee43fa6
commit 68581b009f
2 changed files with 13 additions and 1 deletions
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9
grub-core/osdep/unix/cputime.c
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@ -9,7 +9,14 @@ grub_uint64_t
grub_util_get_cpu_time_ms (void)
{
struct tms tm;
static long sc_clk_tck;
if (!sc_clk_tck)
{
sc_clk_tck = sysconf(_SC_CLK_TCK);
if (sc_clk_tck <= 0)
sc_clk_tck = 1000;
}
times (&tm);
return (tm.tms_utime * 1000ULL) / sysconf(_SC_CLK_TCK);
return (tm.tms_utime * 1000ULL) / sc_clk_tck;
}