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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.
*
*/
#ifndef RGW_DMCLOCK_SYNC_SCHEDULER_H
#define RGW_DMCLOCK_SYNC_SCHEDULER_H
#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
#endif /* RGW_DMCLOCK_SYNC_SCHEDULER_H */
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