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体验新版 GitCode,发现更多精彩内容 >>
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6e3cc0c9
编写于
1月 08, 2018
作者:
Y
Yu Yang
提交者:
GitHub
1月 08, 2018
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差异文件
Merge pull request #7240 from reyoung/feature/make_lod_a_share_ptr
Add COWPtr and its unittest
上级
e3d296fd
3b0afae3
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
134 addition
and
1 deletion
+134
-1
paddle/framework/CMakeLists.txt
paddle/framework/CMakeLists.txt
+1
-1
paddle/framework/details/cow_ptr.h
paddle/framework/details/cow_ptr.h
+98
-0
paddle/framework/details/cow_ptr_test.cc
paddle/framework/details/cow_ptr_test.cc
+35
-0
未找到文件。
paddle/framework/CMakeLists.txt
浏览文件 @
6e3cc0c9
...
...
@@ -79,6 +79,6 @@ cc_library(init SRCS init.cc DEPS gflags device_context place stringpiece operat
cc_test
(
init_test SRCS init_test.cc DEPS init
)
cc_test
(
op_kernel_type_test SRCS op_kernel_type_test.cc DEPS place device_context framework_proto
)
cc_test
(
cow_ptr_tests SRCS details/cow_ptr_test.cc
)
nv_test
(
device_data_transform_test SRCS device_data_transform_test.cu
DEPS operator op_registry init math_function
)
paddle/framework/details/cow_ptr.h
0 → 100644
浏览文件 @
6e3cc0c9
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
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. */
#pragma once
#include <memory>
#include <thread>
namespace
paddle
{
namespace
framework
{
namespace
details
{
// Change it to thread safe flags if needed.
class
ThreadUnsafeOwnershipFlags
{
public:
ThreadUnsafeOwnershipFlags
(
bool
flag
)
:
flag_
(
flag
)
{}
ThreadUnsafeOwnershipFlags
(
const
ThreadUnsafeOwnershipFlags
&
other
)
=
delete
;
ThreadUnsafeOwnershipFlags
&
operator
=
(
const
ThreadUnsafeOwnershipFlags
&
other
)
=
delete
;
ThreadUnsafeOwnershipFlags
(
ThreadUnsafeOwnershipFlags
&&
other
)
=
default
;
void
SetOwnership
(
bool
flag
)
{
flag_
=
flag
;
}
// Invoke the callback if it is not owned.
template
<
typename
Callback
>
void
AcquireOwnershipOnce
(
Callback
acquire
)
{
if
(
!
flag_
)
{
acquire
();
flag_
=
true
;
}
}
private:
bool
flag_
;
};
// Copy-On-Write pointer.
// It will hold a T* pointer, and only copy once when `MutableData` is invoked.
//
// The template parameter OwnershipFlags should have:
// * a constructor takes a bool. True if own.
// * 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:
// Ctor from raw pointer.
explicit
COWPtr
(
T
*
ptr
)
:
payload_
(
ptr
),
ownership_
{
true
}
{}
// Move methods. Steal ownership from origin
COWPtr
(
COWPtr
&&
other
)
:
payload_
(
other
.
payload_
),
ownership_
{
std
::
move
(
other
.
ownership_
)}
{}
COWPtr
&
operator
=
(
COWPtr
&&
origin
)
=
default
;
// Copy methods. Not own payload
COWPtr
(
const
COWPtr
&
other
)
:
payload_
(
other
.
payload_
),
ownership_
{
false
}
{}
COWPtr
&
operator
=
(
const
COWPtr
&
other
)
{
payload_
=
other
.
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
();
}
private:
// Actual data pointer.
std
::
shared_ptr
<
T
>
payload_
;
// Ownership flag.
OwnershipFlags
ownership_
;
};
}
// namespace details
}
// namespace framework
}
// namespace paddle
paddle/framework/details/cow_ptr_test.cc
0 → 100644
浏览文件 @
6e3cc0c9
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
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. */
#include "paddle/framework/details/cow_ptr.h"
#include "gtest/gtest.h"
namespace
paddle
{
namespace
framework
{
namespace
details
{
TEST
(
COWPtr
,
all
)
{
COWPtr
<
int
>
ptr
(
new
int
{
0
});
ASSERT_EQ
(
ptr
.
Data
(),
0
);
COWPtr
<
int
>
ptr2
=
ptr
;
ASSERT_EQ
(
ptr2
.
Data
(),
0
);
ASSERT_EQ
(
&
ptr2
.
Data
(),
&
ptr
.
Data
());
*
ptr2
.
MutableData
()
=
10
;
ASSERT_EQ
(
ptr
.
Data
(),
0
);
ASSERT_EQ
(
ptr2
.
Data
(),
10
);
}
}
// namespace details
}
// namespace framework
}
// namespace paddle
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