01: //
02: // Copyright (C) 2005 United States Government as represented by the
03: // Administrator of the National Aeronautics and Space Administration
04: // (NASA). All Rights Reserved.
05: //
06: // This software is distributed under the NASA Open Source Agreement
07: // (NOSA), version 1.3. The NOSA has been approved by the Open Source
08: // Initiative. See the file NOSA-1.3-JPF at the top of the distribution
09: // directory tree for the complete NOSA document.
10: //
11: // THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
12: // KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
13: // LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
14: // SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
15: // A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
16: // THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
17: // DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
18: //
19: package DEOS;
20:
21: /**
22: * DOCUMENT ME!
23: */
24: class ProcessConstraint {
25: int remainingNormalizedUtilization;
26: int initialNormalizedUtilization;
27:
28: public ProcessConstraint(int theUtilization) {
29: //System.out.println("ProcessConstraint Constructor");
30: initialNormalizedUtilization = theUtilization;
31: remainingNormalizedUtilization = theUtilization;
32: }
33:
34: public static int CPUTimeToNormalizedUtilization(int CPUTime,
35: int periodIndex) {
36: int ticksPerPeriod = (Registry
37: .periodDurationInMicroSecs(periodIndex) / Registry
38: .periodDurationInMicroSecs(0));
39:
40: //System.out.println("CPUTime " + CPUTime + " NormTime " +
41: // ((CPUTime + ticksPerPeriod -1) / ticksPerPeriod));
42: //return (CPUTime + ticksPerPeriod -1) / ticksPerPeriod;
43: return CPUTime / ticksPerPeriod;
44: }
45:
46: public boolean allocateCPUForThread(int CPUTime, int periodIndex,
47: boolean isISR) {
48: int normalizedThreadUtilization = CPUTimeToNormalizedUtilization(
49: CPUTime, periodIndex);
50:
51: //System.out.println("ProcessConstraint.allocateCPUForThread " +
52: // normalizedThreadUtilization + "(= norm)vs(remain =)"
53: // + remainingNormalizedUtilization);
54: if (normalizedThreadUtilization > remainingNormalizedUtilization) {
55: return false; // InsufficientCPU
56: }
57:
58: remainingNormalizedUtilization -= normalizedThreadUtilization;
59:
60: return true;
61: }
62:
63: public void deallocateCPUForThread(int CPUTime, int periodIndex) {
64: remainingNormalizedUtilization += CPUTimeToNormalizedUtilization(
65: CPUTime, periodIndex);
66: }
67:
68: public int oneHundredPercentUtilization() {
69: return Registry.periodDurationInMicroSecs(0);
70: }
71: }
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