yrp.ql

from FunctionCall call, FunctionCall lock
where
  // Assert that `lock` is your lock function.
  lock.getTarget().getName() = "lock_function" and

  // Assert that `call` is your target function.
  call.getTarget().getName() = "yrp" and

  // Assert that there is not a predecesor to `call` that is a call to the lock function.
  not call.getAPredecessor+() = lock

select call, "Function is called without locking"