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#include <mbgl/util/worker.hpp>
#include <mbgl/util/work_task.hpp>
#include <mbgl/util/work_request.hpp>
#include <mbgl/platform/platform.hpp>
#include <cassert>
#include <future>
namespace mbgl {
class Worker::Impl {
public:
Impl(uv_loop_t*) {}
void doWork(std::shared_ptr<WorkTask>& task) {
task->runTask();
}
};
Worker::Worker(std::size_t count) {
util::ThreadContext context = {"Worker", util::ThreadType::Worker, util::ThreadPriority::Low};
for (std::size_t i = 0; i < count; i++) {
std::unique_ptr<util::Thread<Impl>> worker(new util::Thread<Impl>(context));
// FIXME: Workers should not access the FileSource but it
// is currently needed because of GlyphsPBF. See #1664.
auto task = std::make_shared<WorkTask>([fs = util::ThreadContext::getFileSource()]{
util::ThreadContext::setFileSource(fs);
}, []{});
worker->invoke(&Worker::Impl::doWork, task);
threads.emplace_back(std::move(worker));
}
}
Worker::~Worker() = default;
std::unique_ptr<WorkRequest> Worker::send(Fn work, Fn after) {
auto task = std::make_shared<WorkTask>(work, after);
auto request = std::make_unique<WorkRequest>(task);
threads[current]->invokeWithResult(&Worker::Impl::doWork, [task] {
task->runAfter();
}, task);
current = (current + 1) % threads.size();
return request;
}
} // end namespace mbgl
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