extern "C" int
clock_setres (clockid_t clk_id, struct timespec *tp)
{
- static NO_COPY bool period_set;
- int status;
-
+ /* Don't use this function. It only exists in QNX. Just return
+ success on CLOCK_REALTIME for backward compat. */
if (clk_id != CLOCK_REALTIME)
{
set_errno (EINVAL);
return -1;
}
-
- /* Convert to 100ns to match OS resolution. The OS uses ULONG values
- to express resolution in 100ns units, so the coarsest timer resolution
- is < 430 secs. Actually the coarsest timer resolution is only slightly
- beyond 15ms, but this might change in future OS versions, so we play nice
- here. */
- ULONGLONG period = tp->tv_sec * NS100PERSEC
- + (tp->tv_nsec + (NSPERSEC/NS100PERSEC) - 1)
- / (NSPERSEC/NS100PERSEC);
-
- /* clock_setres is non-POSIX/non-Linux. On QNX, the function always
- rounds the incoming value to the nearest supported value. */
- ULONG coarsest, finest, actual;
- if (NT_SUCCESS (NtQueryTimerResolution (&coarsest, &finest, &actual)))
- {
- if (period > coarsest)
- period = coarsest;
- else if (finest > period)
- period = finest;
- }
-
- if (period_set
- && NT_SUCCESS (NtSetTimerResolution (minperiod, FALSE, &actual)))
- period_set = false;
-
- status = NtSetTimerResolution (period, TRUE, &actual);
- if (!NT_SUCCESS (status))
- {
- __seterrno_from_nt_status (status);
- return -1;
- }
- minperiod = period;
- period_set = true;
return 0;
}