src/java.base/share/classes/java/io/FileOutputStream.java

rev 11079 : 8025619.01
rev 11080 : 8025619.02
rev 11081 : 8025619.03

*** 24,33 ****
--- 24,34 ----
   */
  
  package java.io;
  
  import java.nio.channels.FileChannel;
+ import java.util.concurrent.atomic.AtomicBoolean;
  import sun.misc.SharedSecrets;
  import sun.misc.JavaIOFileDescriptorAccess;
  import sun.nio.ch.FileChannelImpl;
  
  
*** 66,85 ****
      private final FileDescriptor fd;
  
      /**
       * The associated channel, initialized lazily.
       */
!     private FileChannel channel;
  
      /**
       * The path of the referenced file
       * (null if the stream is created with a file descriptor)
       */
      private final String path;
  
!     private final Object closeLock = new Object();
!     private volatile boolean closed = false;
  
      /**
       * Creates a file output stream to write to the file with the
       * specified name. A new <code>FileDescriptor</code> object is
       * created to represent this file connection.
--- 67,85 ----
      private final FileDescriptor fd;
  
      /**
       * The associated channel, initialized lazily.
       */
!     private volatile FileChannel channel;
  
      /**
       * The path of the referenced file
       * (null if the stream is created with a file descriptor)
       */
      private final String path;
  
!     private final AtomicBoolean closed = new AtomicBoolean(false);
  
      /**
       * Creates a file output stream to write to the file with the
       * specified name. A new <code>FileDescriptor</code> object is
       * created to represent this file connection.
*** 339,357 ****
       *
       * @revised 1.4
       * @spec JSR-51
       */
      public void close() throws IOException {
!         synchronized (closeLock) {
!             if (closed) {
                  return;
              }
-             closed = true;
-         }
  
!         if (channel != null) {
!             channel.close();
          }
  
          fd.closeAll(new Closeable() {
              public void close() throws IOException {
                 close0();
--- 339,356 ----
       *
       * @revised 1.4
       * @spec JSR-51
       */
      public void close() throws IOException {
!         if (!closed.compareAndSet(false, true)) {
!             // if compareAndSet() returns false closed was already true
              return;
          }
  
!         FileChannel fc = channel;
!         if (fc != null) {
!            fc.close();
          }
  
          fd.closeAll(new Closeable() {
              public void close() throws IOException {
                 close0();
*** 392,407 ****
       *
       * @since 1.4
       * @spec JSR-51
       */
      public FileChannel getChannel() {
          synchronized (this) {
!             if (channel == null) {
!                 channel = FileChannelImpl.open(fd, path, false, true, this);
              }
-             return channel;
          }
      }
  
      /**
       * Cleans up the connection to the file, and ensures that the
       * <code>close</code> method of this file output stream is
--- 391,417 ----
       *
       * @since 1.4
       * @spec JSR-51
       */
      public FileChannel getChannel() {
+         FileChannel fc = this.channel;
+         if (fc == null) {
              synchronized (this) {
!                 fc = this.channel;
!                 if (fc == null) {
!                     this.channel = fc = FileChannelImpl.open(fd, path, false, true, this);
!                     if (closed.get()) {
!                         try {
!                             fc.close();
!                         } catch (IOException ioe) {
!                             throw new InternalError(ioe); // should not happen
!                         }
!                     }
!                 }
              }
          }
+         return fc;
      }
  
      /**
       * Cleans up the connection to the file, and ensures that the
       * <code>close</code> method of this file output stream is