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diff --git a/src/rgw/rgw_dmclock_sync_scheduler.h b/src/rgw/rgw_dmclock_sync_scheduler.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab ft=cpp
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2018 SUSE Linux Gmbh
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#pragma once
+
+#include "rgw_dmclock_scheduler.h"
+#include "rgw_dmclock_scheduler_ctx.h"
+
+namespace rgw::dmclock {
+// For a blocking SyncRequest we hold a reference to a cv and the caller must
+// ensure the lifetime
+struct SyncRequest : public Request {
+ std::mutex& req_mtx;
+ std::condition_variable& req_cv;
+ ReqState& req_state;
+ GetClientCounters& counters;
+ explicit SyncRequest(client_id _id, Time started, Cost cost,
+ std::mutex& mtx, std::condition_variable& _cv,
+ ReqState& _state, GetClientCounters& counters):
+ Request{_id, started, cost}, req_mtx(mtx), req_cv(_cv), req_state(_state), counters(counters) {};
+};
+
+class SyncScheduler: public Scheduler {
+public:
+ template <typename ...Args>
+ SyncScheduler(CephContext *cct, GetClientCounters&& counters,
+ Args&& ...args);
+ ~SyncScheduler();
+
+ // submit a blocking request for dmclock scheduling, this function waits until
+ // the request is ready.
+ int add_request(const client_id& client, const ReqParams& params,
+ const Time& time, Cost cost);
+
+
+ void cancel();
+
+ void cancel(const client_id& client);
+
+ static void handle_request_cb(const client_id& c, std::unique_ptr<SyncRequest> req,
+ PhaseType phase, Cost cost);
+private:
+ int schedule_request_impl(const client_id& client, const ReqParams& params,
+ const Time& time, const Cost& cost,
+ optional_yield _y [[maybe_unused]]) override
+ {
+ return add_request(client, params, time, cost);
+ }
+
+ static constexpr bool IsDelayed = false;
+ using Queue = crimson::dmclock::PushPriorityQueue<client_id, SyncRequest, IsDelayed>;
+ using RequestRef = typename Queue::RequestRef;
+ using Clock = ceph::coarse_real_clock;
+
+ Queue queue;
+ CephContext const *cct;
+ GetClientCounters counters; //< provides per-client perf counters
+};
+
+template <typename ...Args>
+SyncScheduler::SyncScheduler(CephContext *cct, GetClientCounters&& counters,
+ Args&& ...args):
+ queue(std::forward<Args>(args)...), cct(cct), counters(std::move(counters))
+{}
+
+} // namespace rgw::dmclock