* allowing the CAS below to succeed.
     */
    Thread currentThread = Thread.currentThread();
    if (!compareAndSet(null, currentThread)) {
      return; // someone else has run or is running.
    }

    boolean run = !isDone();
    T result = null;
    Throwable error = null;
    try {
      if (run) {
        result = runInterruptibly();

# Gets the download command supported by the system (currently either curl or wget)
DOWNLOAD_COMMAND=""
function set_download_command () {
  # Try curl.
  if command -v curl > /dev/null; then
    if curl --version | grep Protocols  | grep https > /dev/null; then
      DOWNLOAD_COMMAND="curl -fLSs --retry 5 --retry-delay 1 --retry-connrefused"
      return
    fi
    echo curl does not support https, will try wget for downloading files.
  else

    if (expectedSequenceNumber != ANY_SEQUENCE_NUMBER &&
      (entry == null || entry.sequenceNumber != expectedSequenceNumber)
    ) {
      return null // Snapshot is stale.
    }

    if (entry?.currentEditor != null) {
      return null // Another edit is in progress.
    }

    if (entry != null && entry.lockingSourceCount != 0) {
      return null // We can't write this file because a reader is still reading it.
    }

        this.request.setGoals(goals);
        this.request.setBaseDirectory((executionRootDir != null) ? new File(executionRootDir) : null);
        this.request.setStartTime(startTime);
        this.result = null;
        this.repositorySystemSession = null;
    }

    @Deprecated
    public MavenSession(
            PlexusContainer container,
            MavenExecutionRequest request,

       <version>1.4.0</version>
     </dependency>
     ```

 *  **`Request.Builder` no longer accepts null if a request body is required.**
    Passing null will now fail for request methods that require a body. Instead
    use an empty body such as this one:

    ```java
        RequestBody.create(null, new byte[0]);
    ```

 * **`CertificatePinner` now supports wildcard hostnames.** As always with

        synchronized(this@Relay) {
          upstreamReader = null
          ******@****.***All()
        }
      }
    }

    override fun timeout(): Timeout = timeout

    @Throws(IOException::class)
    override fun close() {
      if (fileOperator == null) return // Already closed.
      fileOperator = null

      var fileToClose: RandomAccessFile? = null
      synchronized(this@Relay) {
        sourceCount--

   *     return ref.get() == null;
   *   }
   * });
   * }</pre>
   *
   * @throws RuntimeException if timed out or interrupted while waiting
   */
  public static void awaitClear(WeakReference<?> ref) {
    awaitDone(
        new FinalizationPredicate() {
          @Override
          public boolean isDone() {
            return ref.get() == null;
          }
        });
  }

    private static final String DEFAULT_SERVICE = "cifs";

    private static final Set<ASN1ObjectIdentifier> PREFERRED_MECHS = new HashSet<>();

    private Subject subject = null;
    private String user = null;
    private String realm = null;
    private String service = DEFAULT_SERVICE;
    private int userLifetime = GSSCredential.DEFAULT_LIFETIME;
    private int contextLifetime = GSSContext.DEFAULT_LIFETIME;

   * find it when available. When this is null, use the slow way.
   */
  @J2ktIncompatible
  @GwtIncompatible // java.lang.reflect
  @CheckForNull
  private static final Method getStackTraceElementMethod = (jla == null) ? null : getGetMethod();

  /**
   * The "getStackTraceDepth" method, only available on some JDKs so we use reflection to find it
   * when available. When this is null, use the slow way.
   */

            Set<RequestParam> params ) throws CIFSException {
        CIFSException last = null;
        RequestWithPath rpath = ( request instanceof RequestWithPath ) ? (RequestWithPath) request : null;
        String savedPath = rpath != null ? rpath.getPath() : null;
        String savedFullPath = rpath != null ? rpath.getFullUNCPath() : null;

        String fullPath = "\\" + loc.getServer() + "\\" + loc.getShare() + loc.getUNCPath();