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23 
24 /*
25  * @test
26  * @bug 4162583 7054918
27  * @library ../testlibrary
28  * @summary Make sure Provider api implementations are synchronized properly
29  */
30 
31 import java.security.*;
32 
33 public class SynchronizedAccess {
34 
main(String[] args)35     public static void main(String[] args) throws Exception {
36         ProvidersSnapshot snapshot = ProvidersSnapshot.create();
37         try {
38             main0(args);
39         } finally {
40             snapshot.restore();
41         }
42     }
43 
main0(String[] args)44     public static void main0(String[] args) throws Exception {
45         AccessorThread[] acc = new AccessorThread[200];
46         for (int i=0; i < acc.length; i++)
47             acc[i] = new AccessorThread("thread"+i);
48         for (int i=0; i < acc.length; i++)
49             acc[i].start();
50     }
51 }
52 
53 class AccessorThread extends Thread {
54 
AccessorThread(String str)55     public AccessorThread(String str) {
56         super(str);
57     }
58 
run()59     public void run() {
60         Provider[] provs = new Provider[10];
61         for (int i=0; i < provs.length; i++)
62             provs[i] = new MyProvider("name"+i, 1, "test");
63 
64         int rounds = 20;
65         while (rounds-- > 0) {
66             try {
67                 for (int i=0; i<provs.length; i++) {
68                     Security.addProvider(provs[i]);
69                 }
70                 Signature sig = Signature.getInstance("sigalg");
71                 for (int i=0; i<provs.length; i++) {
72                     Security.removeProvider("name"+i);
73                 }
74                 provs = Security.getProviders();
75             } catch (NoSuchAlgorithmException nsae) {
76             }
77 
78             try {
79                 Thread.sleep(5);
80             } catch (InterruptedException ie) {
81             }
82         } // while
83     }
84 }
85 
86 class MyProvider extends Provider {
MyProvider(String name, double version, String info)87     public MyProvider(String name, double version, String info) {
88         super(name, version, info);
89         put("Signature.sigalg", "sigimpl");
90     }
91 }
92