critical section now available in http working threads

 // example: prevent multiple threads to modify file content in the same time 
 const App = require('@unitybase/ub').App
 // critical sectin must be registered once in the moment modules are evaluated 
 const MY_CS = App.registerCriticalSection('SHARED_FILE_ACCESS')

 function concurrentFileAccess() {
   // protect simulatious file access from the different threads
   App.enterCriticalSection(FSSTORAGE_CS)
   try {
     const data = fs.readfileSync('/tmp/concurent', 'utf8')
     // do some operation what modify data
     fs.readfileSync('/tmp/concurent', data)
   } finally {
     // important to leave critical section in finally block to prevent forever lock 
     App.leaveCriticalSection(FSSTORAGE_CS)  
   }
 }