551 lines
14 KiB
C++
551 lines
14 KiB
C++
/*
|
|
* Copyright (C) 2005 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef ANDROID_REF_BASE_H
|
|
#define ANDROID_REF_BASE_H
|
|
|
|
#include <cutils/atomic.h>
|
|
#include <utils/TextOutput.h>
|
|
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
#include <stdlib.h>
|
|
|
|
// ---------------------------------------------------------------------------
|
|
namespace android {
|
|
|
|
template<typename T> class wp;
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
#define COMPARE(_op_) \
|
|
inline bool operator _op_ (const sp<T>& o) const { \
|
|
return m_ptr _op_ o.m_ptr; \
|
|
} \
|
|
inline bool operator _op_ (const wp<T>& o) const { \
|
|
return m_ptr _op_ o.m_ptr; \
|
|
} \
|
|
inline bool operator _op_ (const T* o) const { \
|
|
return m_ptr _op_ o; \
|
|
} \
|
|
template<typename U> \
|
|
inline bool operator _op_ (const sp<U>& o) const { \
|
|
return m_ptr _op_ o.m_ptr; \
|
|
} \
|
|
template<typename U> \
|
|
inline bool operator _op_ (const wp<U>& o) const { \
|
|
return m_ptr _op_ o.m_ptr; \
|
|
} \
|
|
template<typename U> \
|
|
inline bool operator _op_ (const U* o) const { \
|
|
return m_ptr _op_ o; \
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
class RefBase
|
|
{
|
|
public:
|
|
void incStrong(const void* id) const;
|
|
void decStrong(const void* id) const;
|
|
|
|
void forceIncStrong(const void* id) const;
|
|
|
|
//! DEBUGGING ONLY: Get current strong ref count.
|
|
int32_t getStrongCount() const;
|
|
|
|
class weakref_type
|
|
{
|
|
public:
|
|
RefBase* refBase() const;
|
|
|
|
void incWeak(const void* id);
|
|
void decWeak(const void* id);
|
|
|
|
bool attemptIncStrong(const void* id);
|
|
|
|
//! This is only safe if you have set OBJECT_LIFETIME_FOREVER.
|
|
bool attemptIncWeak(const void* id);
|
|
|
|
//! DEBUGGING ONLY: Get current weak ref count.
|
|
int32_t getWeakCount() const;
|
|
|
|
//! DEBUGGING ONLY: Print references held on object.
|
|
void printRefs() const;
|
|
|
|
//! DEBUGGING ONLY: Enable tracking for this object.
|
|
// enable -- enable/disable tracking
|
|
// retain -- when tracking is enable, if true, then we save a stack trace
|
|
// for each reference and dereference; when retain == false, we
|
|
// match up references and dereferences and keep only the
|
|
// outstanding ones.
|
|
|
|
void trackMe(bool enable, bool retain);
|
|
};
|
|
|
|
weakref_type* createWeak(const void* id) const;
|
|
|
|
weakref_type* getWeakRefs() const;
|
|
|
|
//! DEBUGGING ONLY: Print references held on object.
|
|
inline void printRefs() const { getWeakRefs()->printRefs(); }
|
|
|
|
//! DEBUGGING ONLY: Enable tracking of object.
|
|
inline void trackMe(bool enable, bool retain)
|
|
{
|
|
getWeakRefs()->trackMe(enable, retain);
|
|
}
|
|
|
|
protected:
|
|
RefBase();
|
|
virtual ~RefBase();
|
|
|
|
//! Flags for extendObjectLifetime()
|
|
enum {
|
|
OBJECT_LIFETIME_WEAK = 0x0001,
|
|
OBJECT_LIFETIME_FOREVER = 0x0003
|
|
};
|
|
|
|
void extendObjectLifetime(int32_t mode);
|
|
|
|
//! Flags for onIncStrongAttempted()
|
|
enum {
|
|
FIRST_INC_STRONG = 0x0001
|
|
};
|
|
|
|
virtual void onFirstRef();
|
|
virtual void onLastStrongRef(const void* id);
|
|
virtual bool onIncStrongAttempted(uint32_t flags, const void* id);
|
|
virtual void onLastWeakRef(const void* id);
|
|
|
|
private:
|
|
friend class weakref_type;
|
|
class weakref_impl;
|
|
|
|
RefBase(const RefBase& o);
|
|
RefBase& operator=(const RefBase& o);
|
|
|
|
weakref_impl* const mRefs;
|
|
};
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
template <class T>
|
|
class LightRefBase
|
|
{
|
|
public:
|
|
inline LightRefBase() : mCount(0) { }
|
|
inline void incStrong(const void* id) const {
|
|
android_atomic_inc(&mCount);
|
|
}
|
|
inline void decStrong(const void* id) const {
|
|
if (android_atomic_dec(&mCount) == 1) {
|
|
delete static_cast<const T*>(this);
|
|
}
|
|
}
|
|
|
|
protected:
|
|
inline ~LightRefBase() { }
|
|
|
|
private:
|
|
mutable volatile int32_t mCount;
|
|
};
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
template <typename T>
|
|
class sp
|
|
{
|
|
public:
|
|
typedef typename RefBase::weakref_type weakref_type;
|
|
|
|
inline sp() : m_ptr(0) { }
|
|
|
|
sp(T* other);
|
|
sp(const sp<T>& other);
|
|
template<typename U> sp(U* other);
|
|
template<typename U> sp(const sp<U>& other);
|
|
|
|
~sp();
|
|
|
|
// Assignment
|
|
|
|
sp& operator = (T* other);
|
|
sp& operator = (const sp<T>& other);
|
|
|
|
template<typename U> sp& operator = (const sp<U>& other);
|
|
template<typename U> sp& operator = (U* other);
|
|
|
|
//! Special optimization for use by ProcessState (and nobody else).
|
|
void force_set(T* other);
|
|
|
|
// Reset
|
|
|
|
void clear();
|
|
|
|
// Accessors
|
|
|
|
inline T& operator* () const { return *m_ptr; }
|
|
inline T* operator-> () const { return m_ptr; }
|
|
inline T* get() const { return m_ptr; }
|
|
|
|
// Operators
|
|
|
|
COMPARE(==)
|
|
COMPARE(!=)
|
|
COMPARE(>)
|
|
COMPARE(<)
|
|
COMPARE(<=)
|
|
COMPARE(>=)
|
|
|
|
private:
|
|
template<typename Y> friend class sp;
|
|
template<typename Y> friend class wp;
|
|
|
|
// Optimization for wp::promote().
|
|
sp(T* p, weakref_type* refs);
|
|
|
|
T* m_ptr;
|
|
};
|
|
|
|
template <typename T>
|
|
TextOutput& operator<<(TextOutput& to, const sp<T>& val);
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
template <typename T>
|
|
class wp
|
|
{
|
|
public:
|
|
typedef typename RefBase::weakref_type weakref_type;
|
|
|
|
inline wp() : m_ptr(0) { }
|
|
|
|
wp(T* other);
|
|
wp(const wp<T>& other);
|
|
wp(const sp<T>& other);
|
|
template<typename U> wp(U* other);
|
|
template<typename U> wp(const sp<U>& other);
|
|
template<typename U> wp(const wp<U>& other);
|
|
|
|
~wp();
|
|
|
|
// Assignment
|
|
|
|
wp& operator = (T* other);
|
|
wp& operator = (const wp<T>& other);
|
|
wp& operator = (const sp<T>& other);
|
|
|
|
template<typename U> wp& operator = (U* other);
|
|
template<typename U> wp& operator = (const wp<U>& other);
|
|
template<typename U> wp& operator = (const sp<U>& other);
|
|
|
|
void set_object_and_refs(T* other, weakref_type* refs);
|
|
|
|
// promotion to sp
|
|
|
|
sp<T> promote() const;
|
|
|
|
// Reset
|
|
|
|
void clear();
|
|
|
|
// Accessors
|
|
|
|
inline weakref_type* get_refs() const { return m_refs; }
|
|
|
|
inline T* unsafe_get() const { return m_ptr; }
|
|
|
|
// Operators
|
|
|
|
COMPARE(==)
|
|
COMPARE(!=)
|
|
COMPARE(>)
|
|
COMPARE(<)
|
|
COMPARE(<=)
|
|
COMPARE(>=)
|
|
|
|
private:
|
|
template<typename Y> friend class sp;
|
|
template<typename Y> friend class wp;
|
|
|
|
T* m_ptr;
|
|
weakref_type* m_refs;
|
|
};
|
|
|
|
template <typename T>
|
|
TextOutput& operator<<(TextOutput& to, const wp<T>& val);
|
|
|
|
#undef COMPARE
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// No user serviceable parts below here.
|
|
|
|
template<typename T>
|
|
sp<T>::sp(T* other)
|
|
: m_ptr(other)
|
|
{
|
|
if (other) other->incStrong(this);
|
|
}
|
|
|
|
template<typename T>
|
|
sp<T>::sp(const sp<T>& other)
|
|
: m_ptr(other.m_ptr)
|
|
{
|
|
if (m_ptr) m_ptr->incStrong(this);
|
|
}
|
|
|
|
template<typename T> template<typename U>
|
|
sp<T>::sp(U* other) : m_ptr(other)
|
|
{
|
|
if (other) other->incStrong(this);
|
|
}
|
|
|
|
template<typename T> template<typename U>
|
|
sp<T>::sp(const sp<U>& other)
|
|
: m_ptr(other.m_ptr)
|
|
{
|
|
if (m_ptr) m_ptr->incStrong(this);
|
|
}
|
|
|
|
template<typename T>
|
|
sp<T>::~sp()
|
|
{
|
|
if (m_ptr) m_ptr->decStrong(this);
|
|
}
|
|
|
|
template<typename T>
|
|
sp<T>& sp<T>::operator = (const sp<T>& other) {
|
|
if (other.m_ptr) other.m_ptr->incStrong(this);
|
|
if (m_ptr) m_ptr->decStrong(this);
|
|
m_ptr = other.m_ptr;
|
|
return *this;
|
|
}
|
|
|
|
template<typename T>
|
|
sp<T>& sp<T>::operator = (T* other)
|
|
{
|
|
if (other) other->incStrong(this);
|
|
if (m_ptr) m_ptr->decStrong(this);
|
|
m_ptr = other;
|
|
return *this;
|
|
}
|
|
|
|
template<typename T> template<typename U>
|
|
sp<T>& sp<T>::operator = (const sp<U>& other)
|
|
{
|
|
if (other.m_ptr) other.m_ptr->incStrong(this);
|
|
if (m_ptr) m_ptr->decStrong(this);
|
|
m_ptr = other.m_ptr;
|
|
return *this;
|
|
}
|
|
|
|
template<typename T> template<typename U>
|
|
sp<T>& sp<T>::operator = (U* other)
|
|
{
|
|
if (other) other->incStrong(this);
|
|
if (m_ptr) m_ptr->decStrong(this);
|
|
m_ptr = other;
|
|
return *this;
|
|
}
|
|
|
|
template<typename T>
|
|
void sp<T>::force_set(T* other)
|
|
{
|
|
other->forceIncStrong(this);
|
|
m_ptr = other;
|
|
}
|
|
|
|
template<typename T>
|
|
void sp<T>::clear()
|
|
{
|
|
if (m_ptr) {
|
|
m_ptr->decStrong(this);
|
|
m_ptr = 0;
|
|
}
|
|
}
|
|
|
|
template<typename T>
|
|
sp<T>::sp(T* p, weakref_type* refs)
|
|
: m_ptr((p && refs->attemptIncStrong(this)) ? p : 0)
|
|
{
|
|
}
|
|
|
|
template <typename T>
|
|
inline TextOutput& operator<<(TextOutput& to, const sp<T>& val)
|
|
{
|
|
to << "sp<>(" << val.get() << ")";
|
|
return to;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
template<typename T>
|
|
wp<T>::wp(T* other)
|
|
: m_ptr(other)
|
|
{
|
|
if (other) m_refs = other->createWeak(this);
|
|
}
|
|
|
|
template<typename T>
|
|
wp<T>::wp(const wp<T>& other)
|
|
: m_ptr(other.m_ptr), m_refs(other.m_refs)
|
|
{
|
|
if (m_ptr) m_refs->incWeak(this);
|
|
}
|
|
|
|
template<typename T>
|
|
wp<T>::wp(const sp<T>& other)
|
|
: m_ptr(other.m_ptr)
|
|
{
|
|
if (m_ptr) {
|
|
m_refs = m_ptr->createWeak(this);
|
|
}
|
|
}
|
|
|
|
template<typename T> template<typename U>
|
|
wp<T>::wp(U* other)
|
|
: m_ptr(other)
|
|
{
|
|
if (other) m_refs = other->createWeak(this);
|
|
}
|
|
|
|
template<typename T> template<typename U>
|
|
wp<T>::wp(const wp<U>& other)
|
|
: m_ptr(other.m_ptr)
|
|
{
|
|
if (m_ptr) {
|
|
m_refs = other.m_refs;
|
|
m_refs->incWeak(this);
|
|
}
|
|
}
|
|
|
|
template<typename T> template<typename U>
|
|
wp<T>::wp(const sp<U>& other)
|
|
: m_ptr(other.m_ptr)
|
|
{
|
|
if (m_ptr) {
|
|
m_refs = m_ptr->createWeak(this);
|
|
}
|
|
}
|
|
|
|
template<typename T>
|
|
wp<T>::~wp()
|
|
{
|
|
if (m_ptr) m_refs->decWeak(this);
|
|
}
|
|
|
|
template<typename T>
|
|
wp<T>& wp<T>::operator = (T* other)
|
|
{
|
|
weakref_type* newRefs =
|
|
other ? other->createWeak(this) : 0;
|
|
if (m_ptr) m_refs->decWeak(this);
|
|
m_ptr = other;
|
|
m_refs = newRefs;
|
|
return *this;
|
|
}
|
|
|
|
template<typename T>
|
|
wp<T>& wp<T>::operator = (const wp<T>& other)
|
|
{
|
|
if (other.m_ptr) other.m_refs->incWeak(this);
|
|
if (m_ptr) m_refs->decWeak(this);
|
|
m_ptr = other.m_ptr;
|
|
m_refs = other.m_refs;
|
|
return *this;
|
|
}
|
|
|
|
template<typename T>
|
|
wp<T>& wp<T>::operator = (const sp<T>& other)
|
|
{
|
|
weakref_type* newRefs =
|
|
other != NULL ? other->createWeak(this) : 0;
|
|
if (m_ptr) m_refs->decWeak(this);
|
|
m_ptr = other.get();
|
|
m_refs = newRefs;
|
|
return *this;
|
|
}
|
|
|
|
template<typename T> template<typename U>
|
|
wp<T>& wp<T>::operator = (U* other)
|
|
{
|
|
weakref_type* newRefs =
|
|
other ? other->createWeak(this) : 0;
|
|
if (m_ptr) m_refs->decWeak(this);
|
|
m_ptr = other;
|
|
m_refs = newRefs;
|
|
return *this;
|
|
}
|
|
|
|
template<typename T> template<typename U>
|
|
wp<T>& wp<T>::operator = (const wp<U>& other)
|
|
{
|
|
if (other.m_ptr) other.m_refs->incWeak(this);
|
|
if (m_ptr) m_refs->decWeak(this);
|
|
m_ptr = other.m_ptr;
|
|
m_refs = other.m_refs;
|
|
return *this;
|
|
}
|
|
|
|
template<typename T> template<typename U>
|
|
wp<T>& wp<T>::operator = (const sp<U>& other)
|
|
{
|
|
weakref_type* newRefs =
|
|
other != NULL ? other->createWeak(this) : 0;
|
|
if (m_ptr) m_refs->decWeak(this);
|
|
m_ptr = other.get();
|
|
m_refs = newRefs;
|
|
return *this;
|
|
}
|
|
|
|
template<typename T>
|
|
void wp<T>::set_object_and_refs(T* other, weakref_type* refs)
|
|
{
|
|
if (other) refs->incWeak(this);
|
|
if (m_ptr) m_refs->decWeak(this);
|
|
m_ptr = other;
|
|
m_refs = refs;
|
|
}
|
|
|
|
template<typename T>
|
|
sp<T> wp<T>::promote() const
|
|
{
|
|
return sp<T>(m_ptr, m_refs);
|
|
}
|
|
|
|
template<typename T>
|
|
void wp<T>::clear()
|
|
{
|
|
if (m_ptr) {
|
|
m_refs->decWeak(this);
|
|
m_ptr = 0;
|
|
}
|
|
}
|
|
|
|
template <typename T>
|
|
inline TextOutput& operator<<(TextOutput& to, const wp<T>& val)
|
|
{
|
|
to << "wp<>(" << val.unsafe_get() << ")";
|
|
return to;
|
|
}
|
|
|
|
}; // namespace android
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
#endif // ANDROID_REF_BASE_H
|