undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/hotspot/jtreg/vmTestbase/vm/mlvm/share/MultiThreadedTest.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2010, 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package vm.mlvm.share;
+
+import vm.share.options.Option;
+
+import java.util.concurrent.CyclicBarrier;
+
+
+public abstract class MultiThreadedTest extends MlvmTest {
+
+    @Option(name = "threadsExtra", default_value = "1",
+            description = "Summand of absolute thread count that does not"
+                    + " depend on CPU count")
+    private int threadsExtra;
+
+    @Option(name = "threadsPerCpu", default_value = "0",
+            description = "Summand of absolute thread count that is multiplied"
+                    + " by CPU count")
+    private int threadsPerCpu;
+
+    protected MultiThreadedTest() {
+        // fields will be initialized later by the Option framework
+    }
+
+    protected abstract boolean runThread(int threadNum) throws Throwable;
+
+    protected int calcThreadNum() {
+        // TODO: multiply by StressThreadFactor: JDK-8142970
+        return threadsPerCpu * Runtime.getRuntime().availableProcessors()
+                + threadsExtra;
+    }
+
+    @Override
+    public boolean run() throws Throwable {
+        Thread.UncaughtExceptionHandler exHandler = (Thread t, Throwable e) -> {
+            markTestFailed("Exception in thread %s" + t.getName(), e);
+        };
+        int threadNum = calcThreadNum();
+        Env.traceNormal("Threads to start in this test: " + threadNum);
+        final CyclicBarrier startBarrier = new CyclicBarrier(threadNum + 1);
+
+        Thread[] threads = new Thread[threadNum];
+        for (int i = 0; i < threadNum; i++) {
+            final int ii = i;
+            threads[i] = new Thread(() -> {
+                boolean passed = false;
+                try {
+                    startBarrier.await();
+                    if (runThread(ii)) {
+                        passed = true;
+                    } else {
+                        Env.complain("Failed test in %s",
+                                Thread.currentThread());
+                    }
+                } catch (Throwable e) {
+                    Env.complain(e, "Caught exception in %s",
+                            Thread.currentThread());
+                }
+                if (!passed) {
+                    markTestFailed("Thread " + Thread.currentThread()
+                            + " failed");
+                }
+            });
+            threads[i].setUncaughtExceptionHandler(exHandler);
+            threads[i].start();
+        }
+
+        startBarrier.await();
+        Env.traceNormal(threadNum + " threads have started");
+
+        for (int i = 0; i < threadNum; i++) {
+            threads[i].join();
+        }
+
+        Env.traceNormal("All threads have finished");
+        return true;
+    }
+
+}