MapLibreParticleLab/include/mbgl/util/uv_detail.hpp

#ifndef MBGL_UTIL_UV_DETAIL
#define MBGL_UTIL_UV_DETAIL

#include <mbgl/util/ptr.hpp>
#include <mbgl/util/uv-worker.h>

#include <uv.h>

#include <functional>
#include <cassert>
#include <string>


namespace uv {

class thread {
public:
    inline operator uv_thread_t *() { return &t; }

private:
    uv_thread_t t;
};

class loop {
public:
    inline loop() {
#if UV_VERSION_MAJOR == 0 && UV_VERSION_MINOR <= 10
        l = uv_loop_new();
        if (l == nullptr) {
#else
        l = new uv_loop_t;
        if (uv_loop_init(l) != 0) {
#endif
            throw std::runtime_error("failed to initialize loop");
        }
    }

    inline ~loop() {
#if UV_VERSION_MAJOR == 0 && UV_VERSION_MINOR <= 10
        uv_loop_delete(l);
#else
        uv_loop_close(l);
        delete l;
#endif

    }

    inline uv_loop_t *operator*() { return l; }

private:
    uv_loop_t *l = nullptr;
};

class mutex {
public:
    inline mutex() {
        if (uv_mutex_init(&mtx) != 0) {
            throw std::runtime_error("failed to initialize mutex");
        }
    }
    inline ~mutex() { uv_mutex_destroy(&mtx); }
    inline void lock() { uv_mutex_lock(&mtx); }
    inline void unlock() { uv_mutex_unlock(&mtx); }

private:
    uv_mutex_t mtx;
};

class lock {
public:
    lock(mutex &mtx_) : mtx(mtx_) { mtx.lock(); }
    ~lock() { mtx.unlock(); }

private:
    mutex &mtx;
};

class rwlock {
public:
    inline rwlock() {
        if (uv_rwlock_init(&mtx) != 0) {
            throw std::runtime_error("failed to initialize read-write lock");
        }
    }
    inline ~rwlock() { uv_rwlock_destroy(&mtx); }
    inline void rdlock() { uv_rwlock_rdlock(&mtx); }
    inline void wrlock() { uv_rwlock_wrlock(&mtx); }
    inline void rdunlock() { uv_rwlock_rdunlock(&mtx); }
    inline void wrunlock() { uv_rwlock_wrunlock(&mtx); }

private:
    uv_rwlock_t mtx;
};

class readlock {
public:
    inline readlock(rwlock &mtx_) : mtx(mtx_) { mtx.rdlock(); }
    inline readlock(const std::unique_ptr<rwlock> &mtx_) : mtx(*mtx_) { mtx.rdlock(); }
    inline ~readlock() { mtx.rdunlock(); }

private:
    rwlock &mtx;
};

class writelock {
public:
    inline writelock(rwlock &mtx_) : mtx(mtx_) { mtx.wrlock(); }
    inline writelock(const std::unique_ptr<rwlock> &mtx_) : mtx(*mtx_) { mtx.wrlock(); }
    inline ~writelock() { mtx.wrunlock(); }

private:
    rwlock &mtx;
};

class once {
public:
    typedef void (*callback)();
    void operator()(void (*callback)(void)) {
        uv_once(&o, callback);
    }

private:
    uv_once_t o = UV_ONCE_INIT;
};

class worker {
public:
    inline worker(uv_loop_t *loop, unsigned int count, const char *name = nullptr) : w(new uv_worker_t) {
        uv_worker_init(w, loop, count, name);
    }
    inline ~worker() {
        uv_worker_close(w, [](uv_worker_t *worker) {
            delete worker;
        });
    }
    inline void add(void *data, uv_worker_cb work_cb, uv_worker_after_cb after_work_cb) {
        uv_worker_send(w, data, work_cb, after_work_cb);
    }

private:
    uv_worker_t *w;
};

template <typename T>
class work {
public:
    typedef void (*work_callback)(T &object);
    typedef void (*after_work_callback)(T &object);

    template<typename... Args>
    work(worker &worker, work_callback work_cb_, after_work_callback after_work_cb_, Args&&... args)
        : data(std::forward<Args>(args)...),
          work_cb(work_cb_),
          after_work_cb(after_work_cb_) {
        worker.add(this, do_work, after_work);
    }

private:
    static void do_work(void *data) {
        work<T> *w = reinterpret_cast<work<T> *>(data);
        w->work_cb(w->data);
    }

    static void after_work(void *data) {
        work<T> *w = reinterpret_cast<work<T> *>(data);
        w->after_work_cb(w->data);
        delete w;
    }

private:
    T data;
    work_callback work_cb;
    after_work_callback after_work_cb;
};

}

#endif