// SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#pragma once

#include <mutex>

// FFTW's planner - every fftwf_plan_* and fftwf_destroy_plan call - shares global state and is not
// thread-safe; executing a plan is. So every piece of code that makes or destroys a plan takes this
// one lock, not a lock of its own: two private locks do not stop two planners running at once.
inline std::mutex &FFTWPlannerMutex() {
    static std::mutex m;
    return m;
}