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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2014 Sebastien Ponce <sebastien.ponce@cern.ch>
*
* 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 CEPH_LIBRADOSSTRIPERSTRIPER_MULTIAIOCOMPLETIONIMPL_H
#define CEPH_LIBRADOSSTRIPERSTRIPER_MULTIAIOCOMPLETIONIMPL_H
#include <list>
#include <mutex>
#include "common/ceph_mutex.h"
#include "include/radosstriper/libradosstriper.hpp"
namespace libradosstriper {
struct MultiAioCompletionImpl {
ceph::mutex lock = ceph::make_mutex("MultiAioCompletionImpl lock", false);
ceph::condition_variable cond;
int ref, rval;
int pending_complete, pending_safe;
rados_callback_t callback_complete, callback_safe;
void *callback_complete_arg, *callback_safe_arg;
bool building; ///< true if we are still building this completion
bufferlist bl; /// only used for read case in C api of rados striper
std::list<bufferlist*> bllist; /// keep temporary buffer lists used for destriping
MultiAioCompletionImpl()
: ref(1), rval(0),
pending_complete(0), pending_safe(0),
callback_complete(0), callback_safe(0),
callback_complete_arg(0), callback_safe_arg(0),
building(true) {};
~MultiAioCompletionImpl() {
// deallocate temporary buffer lists
for (std::list<bufferlist*>::iterator it = bllist.begin();
it != bllist.end();
it++) {
delete *it;
}
bllist.clear();
}
int set_complete_callback(void *cb_arg, rados_callback_t cb) {
std::scoped_lock l{lock};
callback_complete = cb;
callback_complete_arg = cb_arg;
return 0;
}
int set_safe_callback(void *cb_arg, rados_callback_t cb) {
std::scoped_lock l{lock};
callback_safe = cb;
callback_safe_arg = cb_arg;
return 0;
}
int wait_for_complete() {
std::unique_lock l{lock};
cond.wait(l, [this] { return !pending_complete; });
return 0;
}
int wait_for_safe() {
std::unique_lock l{lock};
cond.wait(l, [this] { return !pending_safe; });
return 0;
}
bool is_complete() {
std::scoped_lock l{lock};
return pending_complete == 0;
}
bool is_safe() {
std::scoped_lock l{lock};
return pending_safe == 0;
}
void wait_for_complete_and_cb() {
std::unique_lock l{lock};
cond.wait(l, [this] { return !pending_complete && !callback_complete; });
}
void wait_for_safe_and_cb() {
std::unique_lock l{lock};
cond.wait(l, [this] { return !pending_safe && !callback_safe; });
}
bool is_complete_and_cb() {
std::scoped_lock l{lock};
return ((0 == pending_complete) && !callback_complete);
}
bool is_safe_and_cb() {
std::scoped_lock l{lock};
return ((0 == pending_safe) && !callback_safe);
}
int get_return_value() {
std::scoped_lock l{lock};
return rval;
}
void get() {
std::scoped_lock l{lock};
_get();
}
void _get() {
ceph_assert(ceph_mutex_is_locked(lock));
ceph_assert(ref > 0);
++ref;
}
void put() {
lock.lock();
put_unlock();
}
void put_unlock() {
ceph_assert(ref > 0);
int n = --ref;
lock.unlock();
if (!n)
delete this;
}
void add_request() {
std::scoped_lock l{lock};
pending_complete++;
_get();
pending_safe++;
_get();
}
void add_safe_request() {
std::scoped_lock l{lock};
pending_complete++;
_get();
}
void complete() {
ceph_assert(ceph_mutex_is_locked(lock));
if (callback_complete) {
callback_complete(this, callback_complete_arg);
callback_complete = 0;
}
cond.notify_all();
}
void safe() {
ceph_assert(ceph_mutex_is_locked(lock));
if (callback_safe) {
callback_safe(this, callback_safe_arg);
callback_safe = 0;
}
cond.notify_all();
};
void complete_request(ssize_t r);
void safe_request(ssize_t r);
void finish_adding_requests();
};
inline void intrusive_ptr_add_ref(MultiAioCompletionImpl* ptr)
{
ptr->get();
}
inline void intrusive_ptr_release(MultiAioCompletionImpl* ptr)
{
ptr->put();
}
}
#endif // CEPH_LIBRADOSSTRIPERSTRIPER_MULTIAIOCOMPLETIONIMPL_H
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