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#ifndef MBGL_UTIL_UV
#define MBGL_UTIL_UV
#include <uv.h>
#include <functional>
#include <cassert>
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-parameter"
#endif
#include <boost/lockfree/queue.hpp>
#ifdef __clang__
#pragma clang diagnostic pop
#endif
namespace uv {
class loop {
public:
inline loop() : l(uv_loop_new()) {}
inline ~loop() { uv_loop_delete(l); }
inline uv_loop_t *operator*() { return l; }
private:
uv_loop_t *l;
};
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() { mtx.rdunlock(); }
private:
rwlock &mtx;
};
class writelock {
public:
inline writelock(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;
};
template <typename T>
class work {
public:
typedef void (*work_callback)(T &object);
typedef void (*after_work_callback)(T &object);
template<typename... Args>
work(const std::shared_ptr<loop> &loop, work_callback work_cb, after_work_callback after_work_cb, Args&&... args)
: loop(loop),
data(std::forward<Args>(args)...),
work_cb(work_cb),
after_work_cb(after_work_cb) {
req.data = this;
uv_queue_work(**loop, &req, do_work, after_work);
}
private:
static void do_work(uv_work_t *req) {
work<T> *w = static_cast<work<T> *>(req->data);
w->work_cb(w->data);
}
static void after_work(uv_work_t *req, int) {
work<T> *w = static_cast<work<T> *>(req->data);
w->after_work_cb(w->data);
delete w;
}
private:
std::shared_ptr<uv::loop> loop;
uv_work_t req;
T data;
work_callback work_cb;
after_work_callback after_work_cb;
};
}
#endif
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