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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
#include "rgw_dmclock_scheduler.h"
#include "rgw_dmclock_sync_scheduler.h"
#include "rgw_dmclock_scheduler_ctx.h"
namespace rgw::dmclock {
SyncScheduler::~SyncScheduler()
{
cancel();
}
int SyncScheduler::add_request(const client_id& client, const ReqParams& params,
const Time& time, Cost cost)
{
std::mutex req_mtx;
std::condition_variable req_cv;
ReqState rstate {ReqState::Wait};
auto req = SyncRequest{client, time, cost, req_mtx, req_cv, rstate, counters};
int r = queue.add_request_time(req, client, params, time, cost);
if (r == 0) {
if (auto c = counters(client)) {
c->inc(queue_counters::l_qlen);
c->inc(queue_counters::l_cost, cost);
}
queue.request_completed();
// Perform a blocking wait until the request callback is called
{
std::unique_lock lock{req_mtx};
req_cv.wait(lock, [&rstate] {return rstate != ReqState::Wait;});
}
if (rstate == ReqState::Cancelled) {
//FIXME: decide on error code for cancelled request
r = -ECONNABORTED;
}
} else {
// post the error code
if (auto c = counters(client)) {
c->inc(queue_counters::l_limit);
c->inc(queue_counters::l_limit_cost, cost);
}
}
return r;
}
void SyncScheduler::handle_request_cb(const client_id &c,
std::unique_ptr<SyncRequest> req,
PhaseType phase, Cost cost)
{
{ std::lock_guard<std::mutex> lg(req->req_mtx);
req->req_state = ReqState::Ready;
req->req_cv.notify_one();
}
if (auto ctr = req->counters(c)) {
auto lat = Clock::from_double(get_time()) - Clock::from_double(req->started);
if (phase == PhaseType::reservation){
ctr->tinc(queue_counters::l_res_latency, lat);
ctr->inc(queue_counters::l_res);
if (cost) ctr->inc(queue_counters::l_res_cost);
} else if (phase == PhaseType::priority){
ctr->tinc(queue_counters::l_prio_latency, lat);
ctr->inc(queue_counters::l_prio);
if (cost) ctr->inc(queue_counters::l_prio_cost);
}
ctr->dec(queue_counters::l_qlen);
if (cost) ctr->dec(queue_counters::l_cost);
}
}
void SyncScheduler::cancel(const client_id& client)
{
ClientSum sum;
queue.remove_by_client(client, false, [&](RequestRef&& request)
{
sum.count++;
sum.cost += request->cost;
{
std::lock_guard <std::mutex> lg(request->req_mtx);
request->req_state = ReqState::Cancelled;
request->req_cv.notify_one();
}
});
if (auto c = counters(client)) {
on_cancel(c, sum);
}
queue.request_completed();
}
void SyncScheduler::cancel()
{
ClientSums sums;
queue.remove_by_req_filter([&](RequestRef&& request) -> bool
{
inc(sums, request->client, request->cost);
{
std::lock_guard<std::mutex> lg(request->req_mtx);
request->req_state = ReqState::Cancelled;
request->req_cv.notify_one();
}
return true;
});
for (size_t i = 0; i < client_count; i++) {
if (auto c = counters(static_cast<client_id>(i))) {
on_cancel(c, sums[i]);
}
}
}
} // namespace rgw::dmclock
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