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 gov.nasa.jpf.jvm.bytecode;
20:
21: import gov.nasa.jpf.jvm.KernelState;
22: import gov.nasa.jpf.jvm.SystemState;
23: import gov.nasa.jpf.jvm.ThreadInfo;
24:
25: import org.apache.bcel.classfile.ConstantPool;
26: import gov.nasa.jpf.jvm.ElementInfo;
27:
28: /**
29: * Exit monitor for object
30: * ..., objectref => ...
31: */
32: public class MONITOREXIT extends Instruction {
33: public void setPeer(org.apache.bcel.generic.Instruction i,
34: ConstantPool cp) {
35: }
36:
37: public Instruction execute(SystemState ss, KernelState ks,
38: ThreadInfo th) {
39: int objref = th.pop();
40:
41: ks.da.get(objref).unlock(th);
42:
43: return getNext(th);
44: }
45:
46: public boolean isSchedulingRelevant(SystemState ss, KernelState ks,
47: ThreadInfo ti) {
48: int objref = ti.peek();
49: ElementInfo ei = ks.da.get(objref);
50:
51: if (mi.isBodySchedulingRelevant(ti, ei)
52: && (ei.getLockCount() == 1)) {
53: // only relevant if there are other runnables
54: return ti.hasOtherRunnables();
55: } else {
56: // recursive lock, not relevant
57: return false;
58: }
59: }
60:
61: public int getByteCode() {
62: return 0xC3;
63: }
64: }
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