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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_LIBRBD_ASIO_CONTEXT_WQ_H
#define CEPH_LIBRBD_ASIO_CONTEXT_WQ_H
#include "include/common_fwd.h"
#include "include/Context.h"
#include <atomic>
#include <memory>
#include <boost/asio/io_context.hpp>
#include <boost/asio/io_context_strand.hpp>
#include <boost/asio/post.hpp>
namespace librbd {
namespace asio {
class ContextWQ {
public:
explicit ContextWQ(CephContext* cct, boost::asio::io_context& io_context);
~ContextWQ();
void drain();
void queue(Context *ctx, int r = 0) {
++m_queued_ops;
// ensure all legacy ContextWQ users are dispatched sequentially for
// backwards compatibility (i.e. might not be concurrent thread-safe)
boost::asio::post(*m_strand, [this, ctx, r]() {
ctx->complete(r);
ceph_assert(m_queued_ops > 0);
--m_queued_ops;
});
}
private:
CephContext* m_cct;
boost::asio::io_context& m_io_context;
std::unique_ptr<boost::asio::io_context::strand> m_strand;
std::atomic<uint64_t> m_queued_ops;
void drain_handler(Context* ctx);
};
} // namespace asio
} // namespace librbd
#endif // CEPH_LIBRBD_ASIO_CONTEXT_WQ_H
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