preventConflicts.gs

// The function may be used to prevent conflicting launches
function test_PreventConflict() {
  // Lock(1). Use Script memory
  var key = 'any-key-you-want';
  var mem = PropertiesService.getScriptProperties();
  
  
  // Lock(2). Check if other instance of the code is running
  var from = mem.getProperty(key);
  if (from) {
    var json = JSON.parse(from);
    var tnow = new Date();       // current date
    var twas = new Date(json.d); // date from the same function, from memory
    // in minutes
    var diffMinutes = parseInt((tnow.getTime() - twas.getTime())/(1000 * 60));
    // Check in case original script was broken and 10 minutes passed
    if (diffMinutes < 10) { // change 10 to yoor number. It shouldn't be more than usual runtime
      // the function is still running. No launch again
      Logger.log('Stopped thre function to prevent conflict');
      return -1;       
    }    
  }
  
  
  // Lock(3). Save status - in. Will be in memory while function is running
  mem.setProperty(key, JSON.stringify({d: new Date()}));
  
    
  // Main function. the function...
  Utilities.sleep(5000); // change this line with your useful code !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  
  // Lock(4).Release conflict
  mem.deleteProperty(key);
  
  Logger.log('The function is finished. Success!');
  return 0;
}