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3b0afae3
编写于
1月 08, 2018
作者:
Y
Yang Yu
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bdc82956
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
19 addition
and
19 deletion
+19
-19
paddle/framework/details/cow_ptr.h
paddle/framework/details/cow_ptr.h
+19
-15
paddle/framework/details/cow_ptr_test.cc
paddle/framework/details/cow_ptr_test.cc
+0
-4
未找到文件。
paddle/framework/details/cow_ptr.h
浏览文件 @
3b0afae3
...
...
@@ -25,13 +25,14 @@ class ThreadUnsafeOwnershipFlags {
public:
ThreadUnsafeOwnershipFlags
(
bool
flag
)
:
flag_
(
flag
)
{}
ThreadUnsafeOwnershipFlags
(
const
ThreadUnsafeOwnershipFlags
&
o
)
=
delete
;
ThreadUnsafeOwnershipFlags
&
operator
=
(
const
ThreadUnsafeOwnershipFlags
&
o
)
=
delete
;
ThreadUnsafeOwnershipFlags
(
ThreadUnsafeOwnershipFlags
&&
o
)
=
default
;
ThreadUnsafeOwnershipFlags
(
const
ThreadUnsafeOwnershipFlags
&
o
ther
)
=
delete
;
ThreadUnsafeOwnershipFlags
&
operator
=
(
const
ThreadUnsafeOwnershipFlags
&
other
)
=
delete
;
ThreadUnsafeOwnershipFlags
(
ThreadUnsafeOwnershipFlags
&&
o
ther
)
=
default
;
void
SetOwnership
(
bool
flag
)
{
flag_
=
flag
;
}
// Invoke the callback if it is not owned.
template
<
typename
Callback
>
void
AcquireOwnershipOnce
(
Callback
acquire
)
{
if
(
!
flag_
)
{
...
...
@@ -44,7 +45,7 @@ class ThreadUnsafeOwnershipFlags {
bool
flag_
;
};
// Copy
On
Write pointer.
// Copy
-On-
Write pointer.
// It will hold a T* pointer, and only copy once when `MutableData` is invoked.
//
// The template parameter OwnershipFlags should have:
...
...
@@ -52,6 +53,8 @@ class ThreadUnsafeOwnershipFlags {
// * SetOwnership(bool flag).
// * AcquireOwnershipOnce(Callback). It will invoke the callback if it is not
// owned.
//
// https://en.wikipedia.org/wiki/Copy-on-write
template
<
typename
T
,
typename
OwnershipFlags
=
ThreadUnsafeOwnershipFlags
>
class
COWPtr
{
public:
...
...
@@ -59,33 +62,34 @@ class COWPtr {
explicit
COWPtr
(
T
*
ptr
)
:
payload_
(
ptr
),
ownership_
{
true
}
{}
// Move methods. Steal ownership from origin
COWPtr
(
COWPtr
&&
o
)
:
payload_
(
o
.
payload_
),
ownership_
{
std
::
move
(
o
.
ownership_
)}
{}
COWPtr
(
COWPtr
&&
o
ther
)
:
payload_
(
o
ther
.
payload_
),
ownership_
{
std
::
move
(
other
.
ownership_
)}
{}
COWPtr
&
operator
=
(
COWPtr
&&
origin
)
=
default
;
// Copy methods. Not own payload
COWPtr
(
const
COWPtr
&
o
)
:
payload_
(
o
.
payload_
),
ownership_
{
false
}
{}
COWPtr
&
operator
=
(
const
COWPtr
&
o
)
{
payload_
=
o
.
payload_
;
COWPtr
(
const
COWPtr
&
o
ther
)
:
payload_
(
other
.
payload_
),
ownership_
{
false
}
{}
COWPtr
&
operator
=
(
const
COWPtr
&
o
ther
)
{
payload_
=
o
ther
.
payload_
;
ownership_
.
SetOwnership
(
false
);
return
*
this
;
}
// Access read only data.
const
T
&
Data
()
const
{
return
*
payload_
;
}
// Access mutable data. If the data is not owned, the data will be copied
// before.
T
*
MutableData
()
{
ownership_
.
AcquireOwnershipOnce
(
[
this
]
{
payload_
.
reset
(
new
T
(
*
payload_
));
});
return
payload_
.
get
();
}
void
Reset
()
{
ownership_
.
AcquireOwnershipOnce
([
this
]
{
payload_
.
reset
();
});
payload_
.
reset
(
new
T
());
}
private:
// Actual data pointer.
std
::
shared_ptr
<
T
>
payload_
;
// Ownership flag.
OwnershipFlags
ownership_
;
};
...
...
paddle/framework/details/cow_ptr_test.cc
浏览文件 @
3b0afae3
...
...
@@ -28,10 +28,6 @@ TEST(COWPtr, all) {
*
ptr2
.
MutableData
()
=
10
;
ASSERT_EQ
(
ptr
.
Data
(),
0
);
ASSERT_EQ
(
ptr2
.
Data
(),
10
);
auto
ptr_before
=
ptr2
.
MutableData
();
ptr2
.
Reset
();
ASSERT_NE
(
ptr2
.
MutableData
(),
ptr_before
);
}
}
// namespace details
...
...
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