Instrumentation APIs
3-24
3.5.3.3 Statistics About Value Differences
Both STS_set and STS_delta update the contents of the previous value field
in an STS object. Depending on the call sequence, you can measure specific
value differences or the value difference since the last STS update. Example
3-1 shows code for gathering information about differences between specific
values. Figure 3-3 shows current values when measuring differences from
the base value.
Example 3-1. Gathering Information About Differences in Values
Figure 3-3. Current Value Deltas From One STS_set
STS_set(&sts, targetValue); /* T
0
*/
"processing"
STS_delta(&sts, currentValue); /* T
1
*/
"processing"
STS_delta(&sts, currentValue); /* T
2
*/
"processing"
STS_delta(&sts, currentValue); /* T
3
*/
"processing"
Time T
T
1
T
2
T
0
T
3
Previous value
Delta
Current Value x
Dx
3
Dx
2
Dx
1
Current value
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