8050499: (ch) NativeSignal.signal fails with error 316 on OS X

Do not throw an exception when ESRCH returned by pthread_kill() on OS X.

Reviewed-by: alanb

jdk/src/java.base/unix/native/libnio/ch/NativeThread.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2006, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2016, 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
@@ -93,6 +93,10 @@ Java_sun_nio_ch_NativeThread_signal(JNIEnv *env, jclass cl, jlong thread)
 #else
     ret = pthread_kill((pthread_t)thread, INTERRUPT_SIGNAL);
 #endif
+#ifdef MACOSX
+    if (ret != 0 && ret != ESRCH)
+#else
     if (ret != 0)
+#endif
         JNU_ThrowIOExceptionWithLastError(env, "Thread signal failed");
 }

jdk/test/java/nio/channels/DatagramChannel/StressNativeSignal.java

@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2016, 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.
+ */
+
+/* @test
+ * @bug 8050499
+ * @summary Attempt to provoke error 316 on OS X in NativeSignal.signal()
+ */
+
+import java.io.*;
+import java.net.*;
+import java.nio.ByteBuffer;
+import java.nio.channels.DatagramChannel;
+
+public class StressNativeSignal {
+    private UDPThread udpThread;
+    private ServerSocketThread serverSocketThread;
+
+    StressNativeSignal() {
+        try {
+            serverSocketThread = new ServerSocketThread();
+            serverSocketThread.start();
+
+            udpThread = new UDPThread();
+            udpThread.start();
+        } catch (Exception z) {
+            z.printStackTrace();
+        }
+    }
+
+    public static void main(String[] args) throws Throwable {
+        StressNativeSignal test = new StressNativeSignal();
+        try {
+            Thread.sleep(3000);
+        } catch (Exception z) {
+            z.printStackTrace(System.err);
+        }
+
+        test.shutdown();
+    }
+
+    public void shutdown() {
+        udpThread.terminate();
+        try {
+            udpThread.join();
+        } catch (Exception z) {
+            z.printStackTrace(System.err);
+        }
+
+        serverSocketThread.terminate();
+        try {
+            serverSocketThread.join();
+        } catch (Exception z) {
+            z.printStackTrace(System.err);
+        }
+    }
+
+    public class ServerSocketThread extends Thread {
+        private volatile boolean shouldTerminate;
+        private ServerSocket socket;
+
+        public void run() {
+            try {
+                socket = new ServerSocket(1122);
+                Socket client = socket.accept();
+                BufferedReader reader = new BufferedReader(new InputStreamReader(client.getInputStream()));
+                shouldTerminate = false;
+                while (!shouldTerminate) {
+                    String msg = reader.readLine();
+                }
+            } catch (Exception z) {
+                if (!shouldTerminate) {
+                    z.printStackTrace(System.err);
+                }
+            }
+        }
+
+        public void terminate() {
+            shouldTerminate = true;
+            try {
+                socket.close();
+            } catch (Exception z) {
+                z.printStackTrace(System.err);
+                // ignore
+            }
+        }
+    }
+
+    public class UDPThread extends Thread {
+        private DatagramChannel channel;
+        private volatile boolean shouldTerminate;
+
+        @Override
+        public void run() {
+            try {
+                channel = DatagramChannel.open();
+                channel.setOption(StandardSocketOptions.SO_RCVBUF, 6553600);
+                channel.bind(new InetSocketAddress(19870));
+            } catch (IOException z) {
+                z.printStackTrace(System.err);
+            }
+
+            ByteBuffer buf = ByteBuffer.allocate(6553600);
+            shouldTerminate = false;
+            while (!shouldTerminate) {
+                try {
+                    buf.rewind();
+                    channel.receive(buf);
+                } catch (IOException z) {
+                    if (!shouldTerminate) {
+                        z.printStackTrace(System.err);
+                    }
+                }
+            }
+        }
+
+        public void terminate() {
+            shouldTerminate = true;
+            try {
+                channel.close();
+            } catch (Exception z) {
+                z.printStackTrace(System.err);
+                // ignore
+            }
+        }
+    }
+
+}