logback-core/src/main/java/ch/qos/logback/core/AppenderBase.java:  
  public synchronized void doAppend(E eventObject)
logback-core/src/main/java/ch/qos/logback/core/BasicStatusManager.java:  
  locks: 
     Object statusListLock
     Object statusListenerListLock     
  exposition: to derived classes
logback-core/src/main/java/ch/qos/logback/core/status/StatusBase.java:
  locks: this
  lock exposition: this
logback-classic/src/main/java/ch/qos/logback/classic/selector/ContextJNDISelector.java:        
  locks: synchronizedContextMap
  lock exposition: none
logback-classic/src/main/java/ch/qos/logback/classic/Logger.java  
  locks: synchronizedContextMap
  lock exposition: none
logback-classic/src/main/java/ch/qos/logback/classic/LoggerContext.java
  locks: logger, 
         loggerCache should be syncronzied but is not
  lock exposition:
logback-classic/src/main/java/ch/qos/logback/classic/Logger.java:   
   * synchronized on 'this' (Logger) protecting against simultaneous  
   * only within addAppender which is synchronized 
 3) all the other methods
  public synchronized void setLevel(Level newLevel) {
  private synchronized void handleParentLevelChange(int newParentLevelInt) {
  // this method MUST be synchronized. See comments on 'aai' field for further
  public synchronized void addAppender(Appender newAppender) {
logback-core/src/main/java/ch/qos/logback/core/joran/GenericConfigurator.java:    
  locks: context
  lock exposition: none
   * only within addAppender which is synchronized  3) all the other methods
  public synchronized void setLevel(Level newLevel) {
  private synchronized void handleParentLevelChange(int newParentLevelInt) {
  // this method MUST be synchronized. See comments on 'aai' field for further
  public synchronized void addAppender(Appender newAppender) {
logback-core/src/main/java/ch/qos/logback/core/FileAppender.java:  public synchronized void openFile(String file_name) throws IOException {
logback-core/src/main/java/ch/qos/logback/core/net/SMTPAppenderBase.java:  synchronized public void stop() {
logback-core/src/main/java/ch/qos/logback/core/net/SocketAppenderBase.java:          synchronized (this) {
logback-core/src/main/java/ch/qos/logback/core/WriterAppender.java:  public synchronized void stop() {
logback-core/src/main/java/ch/qos/logback/core/WriterAppender.java:  public synchronized void setWriter(Writer writer) {
logback-classic/src/main/java/ch/qos/logback/classic/net/JMSQueueAppender.java:  public synchronized void stop() {
logback-classic/src/main/java/ch/qos/logback/classic/net/JMSQueueAppender.java:    // The synchronized modifier avoids concurrent append and close operations
logback-classic/src/main/java/ch/qos/logback/classic/net/JMSTopicAppender.java:  public synchronized void stop() {
logback-classic/src/main/java/ch/qos/logback/classic/net/JMSTopicAppender.java:    // The synchronized modifier avoids concurrent append and close operations
logback-core/src/main/java/ch/qos/logback/core/status/StatusBase.java:  public synchronized void add(Status child) {
logback-core/src/main/java/ch/qos/logback/core/status/StatusBase.java:  public synchronized boolean hasChildren() {
logback-core/src/main/java/ch/qos/logback/core/status/StatusBase.java:  public synchronized Iterator iterator() {
logback-core/src/main/java/ch/qos/logback/core/status/StatusBase.java:  public synchronized boolean remove(Status statusToRemove) {
logback-classic/src/main/java/ch/qos/logback/classic/net/SimpleSocketServer.java:        synchronized (socketNodeList) {
logback-classic/src/main/java/ch/qos/logback/classic/net/SimpleSocketServer.java:    synchronized(this) {
logback-classic/src/main/java/ch/qos/logback/classic/net/SimpleSocketServer.java:    synchronized (socketNodeList) {
logback-classic/src/main/java/ch/qos/logback/classic/net/SimpleSocketServer.java:    synchronized (socketNodeList) {
logback-classic/src/main/java/ch/qos/logback/classic/pattern/DateConverter.java:      // the AppenderBase.doAppend is synchronized, we are should be