Will "Exclusive" prevent parallel executions started from HTTP request?

I have a webapp that uses camunda with a process which can start multiple executions.
My question is:

  • if I start a task from MVC thread using runtimeService.createMessageCorrelation
  • the task is marked as “Exclusive”
  • do I have a guarantee no other executions can be started until the task finishes? Or does it work only with tasks started by job executor?