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UDEFER_THRESHOLD_USEC
An internal defer routine takes a microsecond sleep argument. However, not all systems provide a useful implementation of a microsecond or nanosecond sleep routine. The UDEFER_THRESHOLD_USEC and UDEFER_64YIELD_USEC configuration options force this routine to make multiple calls to defer(0), which causes a thread yield, to generate shorter (more accurate) sleep intervals.
UDEFER_THRESHOLD_USEC <usec value below which yield calls used>
UDEFER_64YIELD_USEC <usec duration of 64 consecutive yield calls>
Even if the microsecond sleep has provisions for consecutive yields, it will not take effect unless both the DEFER_THRESHOLD_USEC and UDEFER_64YIELD_USEC appear with non-zero values.
See Also
