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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) 2004-2006 Sage Weil <sage@newdream.net>
*
* 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_REFCOUNTEDOBJ_H
#define CEPH_REFCOUNTEDOBJ_H
#include "common/ceph_mutex.h"
#include "common/ceph_context.h"
#include "common/valgrind.h"
#include "common/debug.h"
#include <boost/smart_ptr/intrusive_ptr.hpp>
// re-include our assert to clobber the system one; fix dout:
#include "include/ceph_assert.h"
struct RefCountedObject {
private:
mutable std::atomic<uint64_t> nref;
CephContext *cct;
public:
RefCountedObject(CephContext *c = NULL, int n=1) : nref(n), cct(c) {}
virtual ~RefCountedObject() {
ceph_assert(nref == 0);
}
const RefCountedObject *get() const {
int v = ++nref;
if (cct)
lsubdout(cct, refs, 1) << "RefCountedObject::get " << this << " "
<< (v - 1) << " -> " << v
<< dendl;
return this;
}
RefCountedObject *get() {
int v = ++nref;
if (cct)
lsubdout(cct, refs, 1) << "RefCountedObject::get " << this << " "
<< (v - 1) << " -> " << v
<< dendl;
return this;
}
void put() const {
CephContext *local_cct = cct;
int v = --nref;
if (local_cct)
lsubdout(local_cct, refs, 1) << "RefCountedObject::put " << this << " "
<< (v + 1) << " -> " << v
<< dendl;
if (v == 0) {
ANNOTATE_HAPPENS_AFTER(&nref);
ANNOTATE_HAPPENS_BEFORE_FORGET_ALL(&nref);
delete this;
} else {
ANNOTATE_HAPPENS_BEFORE(&nref);
}
}
void set_cct(CephContext *c) {
cct = c;
}
uint64_t get_nref() const {
return nref;
}
};
#ifndef WITH_SEASTAR
/**
* RefCountedCond
*
* a refcounted condition, will be removed when all references are dropped
*/
struct RefCountedCond : public RefCountedObject {
bool complete;
ceph::mutex lock = ceph::make_mutex("RefCountedCond::lock");
ceph::condition_variable cond;
int rval;
RefCountedCond() : complete(false), rval(0) {}
int wait() {
std::unique_lock l(lock);
while (!complete) {
cond.wait(l);
}
return rval;
}
void done(int r) {
std::lock_guard l(lock);
rval = r;
complete = true;
cond.notify_all();
}
void done() {
done(0);
}
};
/**
* RefCountedWaitObject
*
* refcounted object that allows waiting for the object's last reference.
* Any referrer can either put or put_wait(). A simple put() will return
* immediately, a put_wait() will return only when the object is destroyed.
* e.g., useful when we want to wait for a specific event completion. We
* use RefCountedCond, as the condition can be referenced after the object
* destruction.
*
*/
struct RefCountedWaitObject {
std::atomic<uint64_t> nref = { 1 };
RefCountedCond *c;
RefCountedWaitObject() {
c = new RefCountedCond;
}
virtual ~RefCountedWaitObject() {
c->put();
}
RefCountedWaitObject *get() {
nref++;
return this;
}
bool put() {
bool ret = false;
RefCountedCond *cond = c;
cond->get();
if (--nref == 0) {
cond->done();
delete this;
ret = true;
}
cond->put();
return ret;
}
void put_wait() {
RefCountedCond *cond = c;
cond->get();
if (--nref == 0) {
cond->done();
delete this;
} else {
cond->wait();
}
cond->put();
}
};
#endif // WITH_SEASTAR
static inline void intrusive_ptr_add_ref(const RefCountedObject *p) {
p->get();
}
static inline void intrusive_ptr_release(const RefCountedObject *p) {
p->put();
}
using RefCountedPtr = boost::intrusive_ptr<RefCountedObject>;
#endif
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