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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 Red Hat, Inc.
*
* 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.
*
*/
#include "include/rados/librados.hpp"
#include "rgw_aio_throttle.h"
namespace rgw {
bool Throttle::waiter_ready() const
{
switch (waiter) {
case Wait::Available: return is_available();
case Wait::Completion: return has_completion();
case Wait::Drained: return is_drained();
default: return false;
}
}
AioResultList BlockingAioThrottle::get(const RGWSI_RADOS::Obj& obj,
OpFunc&& f,
uint64_t cost, uint64_t id)
{
auto p = std::make_unique<Pending>();
p->obj = obj;
p->id = id;
p->cost = cost;
std::unique_lock lock{mutex};
if (cost > window) {
p->result = -EDEADLK; // would never succeed
completed.push_back(*p);
} else {
// wait for the write size to become available
pending_size += p->cost;
if (!is_available()) {
ceph_assert(waiter == Wait::None);
waiter = Wait::Available;
cond.wait(lock, [this] { return is_available(); });
waiter = Wait::None;
}
// register the pending write and attach a completion
p->parent = this;
pending.push_back(*p);
lock.unlock();
std::move(f)(this, *static_cast<AioResult*>(p.get()));
lock.lock();
}
p.release();
return std::move(completed);
}
void BlockingAioThrottle::put(AioResult& r)
{
auto& p = static_cast<Pending&>(r);
std::scoped_lock lock{mutex};
// move from pending to completed
pending.erase(pending.iterator_to(p));
completed.push_back(p);
pending_size -= p.cost;
if (waiter_ready()) {
cond.notify_one();
}
}
AioResultList BlockingAioThrottle::poll()
{
std::unique_lock lock{mutex};
return std::move(completed);
}
AioResultList BlockingAioThrottle::wait()
{
std::unique_lock lock{mutex};
if (completed.empty() && !pending.empty()) {
ceph_assert(waiter == Wait::None);
waiter = Wait::Completion;
cond.wait(lock, [this] { return has_completion(); });
waiter = Wait::None;
}
return std::move(completed);
}
AioResultList BlockingAioThrottle::drain()
{
std::unique_lock lock{mutex};
if (!pending.empty()) {
ceph_assert(waiter == Wait::None);
waiter = Wait::Drained;
cond.wait(lock, [this] { return is_drained(); });
waiter = Wait::None;
}
return std::move(completed);
}
template <typename CompletionToken>
auto YieldingAioThrottle::async_wait(CompletionToken&& token)
{
using boost::asio::async_completion;
using Signature = void(boost::system::error_code);
async_completion<CompletionToken, Signature> init(token);
completion = Completion::create(context.get_executor(),
std::move(init.completion_handler));
return init.result.get();
}
AioResultList YieldingAioThrottle::get(const RGWSI_RADOS::Obj& obj,
OpFunc&& f,
uint64_t cost, uint64_t id)
{
auto p = std::make_unique<Pending>();
p->obj = obj;
p->id = id;
p->cost = cost;
if (cost > window) {
p->result = -EDEADLK; // would never succeed
completed.push_back(*p);
} else {
// wait for the write size to become available
pending_size += p->cost;
if (!is_available()) {
ceph_assert(waiter == Wait::None);
ceph_assert(!completion);
boost::system::error_code ec;
waiter = Wait::Available;
async_wait(yield[ec]);
}
// register the pending write and initiate the operation
pending.push_back(*p);
std::move(f)(this, *static_cast<AioResult*>(p.get()));
}
p.release();
return std::move(completed);
}
void YieldingAioThrottle::put(AioResult& r)
{
auto& p = static_cast<Pending&>(r);
// move from pending to completed
pending.erase(pending.iterator_to(p));
completed.push_back(p);
pending_size -= p.cost;
if (waiter_ready()) {
ceph_assert(completion);
ceph::async::post(std::move(completion), boost::system::error_code{});
waiter = Wait::None;
}
}
AioResultList YieldingAioThrottle::poll()
{
return std::move(completed);
}
AioResultList YieldingAioThrottle::wait()
{
if (!has_completion() && !pending.empty()) {
ceph_assert(waiter == Wait::None);
ceph_assert(!completion);
boost::system::error_code ec;
waiter = Wait::Completion;
async_wait(yield[ec]);
}
return std::move(completed);
}
AioResultList YieldingAioThrottle::drain()
{
if (!is_drained()) {
ceph_assert(waiter == Wait::None);
ceph_assert(!completion);
boost::system::error_code ec;
waiter = Wait::Drained;
async_wait(yield[ec]);
}
return std::move(completed);
}
} // namespace rgw
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