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#include <mbgl/util/async_task.hpp>
#include <mbgl/util/run_loop.hpp>
#include <atomic>
#include <functional>
#include <uv.h>
#if UV_VERSION_MAJOR == 0 && UV_VERSION_MINOR <= 10
#define UV_ASYNC_PARAMS(handle) uv_async_t *handle, int
#else
#define UV_ASYNC_PARAMS(handle) uv_async_t *handle
#endif
namespace mbgl {
namespace util {
class AsyncTask::Impl {
public:
Impl(std::function<void()>&& fn)
: async(new uv_async_t),
task(std::move(fn)) {
uv_loop_t* loop = reinterpret_cast<uv_loop_t*>(RunLoop::getLoopHandle());
if (uv_async_init(loop, async, asyncCallback) != 0) {
throw std::runtime_error("Failed to initialize async.");
}
handle()->data = this;
}
~Impl() {
uv_close(handle(), [](uv_handle_t* h) {
delete reinterpret_cast<uv_async_t*>(h);
});
}
void maySend() {
// uv_async_send will do the call coalescing for us.
if (uv_async_send(async) != 0) {
throw std::runtime_error("Failed to async send.");
}
}
void unref() {
uv_unref(handle());
}
private:
static void asyncCallback(UV_ASYNC_PARAMS(handle)) {
reinterpret_cast<Impl*>(handle->data)->task();
}
uv_handle_t* handle() {
return reinterpret_cast<uv_handle_t*>(async);
}
uv_async_t* async;
std::function<void()> task;
};
AsyncTask::AsyncTask(std::function<void()>&& fn)
: impl(std::make_unique<Impl>(std::move(fn))) {
}
AsyncTask::~AsyncTask() {
}
void AsyncTask::send() {
impl->maySend();
}
void AsyncTask::unref() {
impl->unref();
}
}
}
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