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23 
24 /*
25  * @test
26  * @bug 4162583 7054918 8130181
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         for (int i=0; i < acc.length; i++)
51             acc[i].join();
52     }
53 }
54 
55 class AccessorThread extends Thread {
56 
AccessorThread(String str)57     public AccessorThread(String str) {
58         super(str);
59     }
60 
run()61     public void run() {
62         Provider[] provs = new Provider[10];
63         for (int i=0; i < provs.length; i++)
64             provs[i] = new MyProvider("name"+i, "1", "test");
65 
66         int rounds = 20;
67         while (rounds-- > 0) {
68             try {
69                 for (int i=0; i<provs.length; i++) {
70                     Security.addProvider(provs[i]);
71                 }
72                 Signature sig = Signature.getInstance("sigalg");
73                 for (int i=0; i<provs.length; i++) {
74                     Security.removeProvider("name"+i);
75                 }
76                 provs = Security.getProviders();
77             } catch (NoSuchAlgorithmException nsae) {
78             }
79 
80             try {
81                 Thread.sleep(5);
82             } catch (InterruptedException ie) {
83             }
84         } // while
85     }
86 }
87 
88 class MyProvider extends Provider {
MyProvider(String name, String version, String info)89     public MyProvider(String name, String version, String info) {
90         super(name, version, info);
91         put("Signature.sigalg", "sigimpl");
92     }
93 }
94