*
 * <pre>
 * Thread1: acquire(LockA) --X acquire(LockB)
 * Thread2: acquire(LockB) --X acquire(LockA)
 * </pre>
 *
 * <p>Neither thread will progress because each is waiting for the other. In more complex
 * applications, cycles can arise from interactions among more than 2 locks:
 *
 * <pre>
 * Thread1: acquire(LockA) --X acquire(LockB)
 * Thread2: acquire(LockB) --X acquire(LockC)
 * ...

            }
            else {
                this.handle = this.file.openUnshared(this.openFlags, this.access, this.sharing, SmbConstants.ATTR_NORMAL, 0).acquire();
            }
            return this.handle;
        }
        return this.handle.acquire();
    }


    protected static IOException seToIoe ( SmbException se ) {
        IOException ioe = se;
        Throwable root = se.getCause();

        if ( this.handle == null || !this.handle.isValid() ) {
            // one extra acquire to keep this open till the stream is released
            this.handle = this.file.openUnshared(this.openFlags, this.access, this.sharing, SmbConstants.ATTR_NORMAL, this.options).acquire();
            return this.handle;
        }
        return this.handle.acquire();
    }


    /**
     * Ensures that the file descriptor is openend

                    continue;
                }

                if ( log.isTraceEnabled() ) {
                    log.trace("Reusing transport connection " + conn);
                }
                return conn.acquire();
            }
        }

        return null;
    }


    @Override

    protected synchronized SmbFileHandleImpl ensureOpen () throws CIFSException {
        if ( !isOpen() ) {
            // one extra acquire to keep this open till the stream is released
            this.handle = this.file.openUnshared(this.openFlags, this.access, this.sharing, SmbConstants.ATTR_NORMAL, 0).acquire();
            if ( this.append ) {
                this.fp = this.handle.getInitialSize();
                if ( log.isDebugEnabled() ) {

    return connections.count {
      it.withLock { it.calls.isEmpty() }
    }
  }

  fun connectionCount(): Int {
    return connections.size
  }

  /**
   * Attempts to acquire a recycled connection to [address] for [connectionUser]. Returns the connection if it
   * was acquired, or null if no connection was acquired. The acquired connection will also be

* Caddy (that can also handle certificate renewals)
* Nginx
* HAProxy

## Let's Encrypt

Before Let's Encrypt, these **HTTPS certificates** were sold by trusted third parties.

The process to acquire one of these certificates used to be cumbersome, require quite some paperwork and the certificates were quite expensive.

        Versioning versioning = null;
        try {
            if (metadata != null) {
                try (SyncContext syncContext = syncContextFactory.newInstance(session, true)) {
                    syncContext.acquire(null, Collections.singleton(metadata));

                    if (metadata.getPath() != null && Files.exists(metadata.getPath())) {
                        try (InputStream in = Files.newInputStream(metadata.getPath())) {

    /**
     * @return session increased usage count
     */
    public Transport acquire () {
        long usage = this.usageCount.incrementAndGet();
        if ( log.isTraceEnabled() ) {
            log.trace("Acquire transport " + usage + " " + this);
        }
        return this;
    }


    /**
     * {@inheritDoc}
     *

  Striped64() {}

  /** CASes the base field. */
  final boolean casBase(long cmp, long val) {
    return UNSAFE.compareAndSwapLong(this, baseOffset, cmp, val);
  }

  /** CASes the busy field from 0 to 1 to acquire lock. */
  final boolean casBusy() {
    return UNSAFE.compareAndSwapInt(this, busyOffset, 0, 1);
  }

  /**
   * Computes the function of current and new value. Subclasses should open-code this update