How to deal with fftw thread callback called recursively

[milasudril]

I noticed that the thread callback routine may be called recursively. This is problematic when using a simple thread_pool that accepts jobs in a FIFO order. It deadlocks because it is waiting on a task that cannot be executed yet.

My code is currently

fftwf_init_threads();
fftwf_plan_with_nthreads(static_cast<int>(workers.max_concurrency()));
fftwf_threads_set_callback(
	[](void *(*work)(char*), char* jobdata, size_t elsize, int njobs, void* workers)
 	{
		signaling_counter counter{static_cast<size_t>(njobs)};
		auto& obj = *static_cast<thread_pool_type*>(workers);
		for (int i = 0; i < njobs; ++i)
		{
			obj.submit(
				[work, jobdata, elsize, i, &counter = counter.get_state()]{
					work(jobdata + elsize * i);
					counter.decrement();
				}
			);
		}
		counter.wait();
	},
	&workers
);

What is the approach I should take to avoid deadlock?