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TestFinalizer.cs
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using
NUnit
.
Framework
;
using
Python
.
Runtime
;
using
System
;
using
System
.
Linq
;
using
System
.
Threading
;
namespace
Python
.
EmbeddingTest
{
public
class
TestFinalizer
{
private
int
_oldThreshold
;
[
SetUp
]
public
void
SetUp
(
)
{
_oldThreshold
=
Finalizer
.
Instance
.
Threshold
;
PythonEngine
.
Initialize
(
)
;
Exceptions
.
Clear
(
)
;
}
[
TearDown
]
public
void
TearDown
(
)
{
Finalizer
.
Instance
.
Threshold
=
_oldThreshold
;
PythonEngine
.
Shutdown
(
)
;
}
private
static
void
FullGCCollect
(
)
{
GC
.
Collect
(
GC
.
MaxGeneration
,
GCCollectionMode
.
Forced
)
;
GC
.
WaitForPendingFinalizers
(
)
;
}
[
Test
]
public
void
CollectBasicObject
(
)
{
Assert
.
IsTrue
(
Finalizer
.
Instance
.
Enable
)
;
Finalizer
.
Instance
.
Threshold
=
1
;
bool
called
=
false
;
var
objectCount
=
0
;
EventHandler
<
Finalizer
.
CollectArgs
>
handler
=
(
s
,
e
)
=>
{
objectCount
=
e
.
ObjectCount
;
called
=
true
;
}
;
Assert
.
IsFalse
(
called
,
"The event handler was called before it was installed"
)
;
Finalizer
.
Instance
.
CollectOnce
+=
handler
;
WeakReference
shortWeak
;
WeakReference
longWeak
;
{
MakeAGarbage
(
out
shortWeak
,
out
longWeak
)
;
}
FullGCCollect
(
)
;
// The object has been resurrected
Warn
.
If
(
shortWeak
.
IsAlive
,
"The referenced object is alive although it should have been collected"
,
shortWeak
)
;
Assert
.
IsTrue
(
longWeak
.
IsAlive
,
"The reference object is not alive although it should still be"
,
longWeak
)
;
{
var
garbage
=
Finalizer
.
Instance
.
GetCollectedObjects
(
)
;
Assert
.
NotZero
(
garbage
.
Count
,
"There should still be garbage around"
)
;
Warn
.
Unless
(
garbage
.
Any
(
T
=>
ReferenceEquals
(
T
.
Target
,
longWeak
.
Target
)
)
,
$
"The
{
nameof
(
longWeak
)
}
reference doesn't show up in the garbage list"
,
garbage
)
;
}
try
{
Finalizer
.
Instance
.
Collect
(
forceDispose
:
false
)
;
}
finally
{
Finalizer
.
Instance
.
CollectOnce
-=
handler
;
}
Assert
.
IsTrue
(
called
,
"The event handler was not called during finalization"
)
;
Assert
.
GreaterOrEqual
(
objectCount
,
1
)
;
}
private
static
void
MakeAGarbage
(
out
WeakReference
shortWeak
,
out
WeakReference
longWeak
)
{
PyLong
obj
=
new
PyLong
(
1024
)
;
shortWeak
=
new
WeakReference
(
obj
)
;
longWeak
=
new
WeakReference
(
obj
,
true
)
;
obj
=
null
;
}
private
static
long
CompareWithFinalizerOn
(
PyObject
pyCollect
,
bool
enbale
)
{
// Must larger than 512 bytes make sure Python use
string
str
=
new
string
(
'1'
,
1024
)
;
Finalizer
.
Instance
.
Enable
=
true
;
FullGCCollect
(
)
;
FullGCCollect
(
)
;
pyCollect
.
Invoke
(
)
;
Finalizer
.
Instance
.
Collect
(
)
;
Finalizer
.
Instance
.
Enable
=
enbale
;
// Estimate unmanaged memory size
long
before
=
Environment
.
WorkingSet
-
GC
.
GetTotalMemory
(
true
)
;
for
(
int
i
=
0
;
i
<
10000
;
i
++
)
{
// Memory will leak when disable Finalizer
new
PyString
(
str
)
;
}
FullGCCollect
(
)
;
FullGCCollect
(
)
;
pyCollect
.
Invoke
(
)
;
if
(
enbale
)
{
Finalizer
.
Instance
.
Collect
(
)
;
}
FullGCCollect
(
)
;
FullGCCollect
(
)
;
long
after
=
Environment
.
WorkingSet
-
GC
.
GetTotalMemory
(
true
)
;
return
after
-
before
;
}
/// <summary>
/// Because of two vms both have their memory manager,
/// this test only prove the finalizer has take effect.
/// </summary>
[
Test
]
[
Ignore
(
"Too many uncertainties, only manual on when debugging"
)
]
public
void
SimpleTestMemory
(
)
{
bool
oldState
=
Finalizer
.
Instance
.
Enable
;
try
{
using
(
PyObject
gcModule
=
PythonEngine
.
ImportModule
(
"gc"
)
)
using
(
PyObject
pyCollect
=
gcModule
.
GetAttr
(
"collect"
)
)
{
long
span1
=
CompareWithFinalizerOn
(
pyCollect
,
false
)
;
long
span2
=
CompareWithFinalizerOn
(
pyCollect
,
true
)
;
Assert
.
Less
(
span2
,
span1
)
;
}
}
finally
{
Finalizer
.
Instance
.
Enable
=
oldState
;
}
}
class
MyPyObject
:
PyObject
{
public
MyPyObject
(
IntPtr
op
)
:
base
(
op
)
{
}
protected
override
void
Dispose
(
bool
disposing
)
{
base
.
Dispose
(
disposing
)
;
GC
.
SuppressFinalize
(
this
)
;
throw
new
Exception
(
"MyPyObject"
)
;
}
internal
static
void
CreateMyPyObject
(
IntPtr
op
)
{
Runtime
.
Runtime
.
XIncref
(
op
)
;
new
MyPyObject
(
op
)
;
}
}
[
Test
]
public
void
ErrorHandling
(
)
{
bool
called
=
false
;
var
errorMessage
=
""
;
EventHandler
<
Finalizer
.
ErrorArgs
>
handleFunc
=
(
sender
,
args
)
=>
{
called
=
true
;
errorMessage
=
args
.
Error
.
Message
;
}
;
Finalizer
.
Instance
.
Threshold
=
1
;
Finalizer
.
Instance
.
ErrorHandler
+=
handleFunc
;
try
{
WeakReference
shortWeak
;
WeakReference
longWeak
;
{
MakeAGarbage
(
out
shortWeak
,
out
longWeak
)
;
var
obj
=
(
PyLong
)
longWeak
.
Target
;
IntPtr
handle
=
obj
.
Handle
;
shortWeak
=
null
;
longWeak
=
null
;
MyPyObject
.
CreateMyPyObject
(
handle
)
;
obj
.
Dispose
(
)
;
obj
=
null
;
}
FullGCCollect
(
)
;
Finalizer
.
Instance
.
Collect
(
)
;
Assert
.
IsTrue
(
called
)
;
}
finally
{
Finalizer
.
Instance
.
ErrorHandler
-=
handleFunc
;
}
Assert
.
AreEqual
(
errorMessage
,
"MyPyObject"
)
;
}
[
Test
]
public
void
ValidateRefCount
(
)
{
if
(
!
Finalizer
.
Instance
.
RefCountValidationEnabled
)
{
Assert
.
Pass
(
"Only run with FINALIZER_CHECK"
)
;
}
IntPtr
ptr
=
IntPtr
.
Zero
;
bool
called
=
false
;
Finalizer
.
IncorrectRefCntHandler
handler
=
(
s
,
e
)
=>
{
called
=
true
;
Assert
.
AreEqual
(
ptr
,
e
.
Handle
)
;
Assert
.
AreEqual
(
2
,
e
.
ImpactedObjects
.
Count
)
;
// Fix for this test, don't do this on general environment
Runtime
.
Runtime
.
XIncref
(
e
.
Handle
)
;
return
false
;
}
;
Finalizer
.
Instance
.
IncorrectRefCntResolver
+=
handler
;
try
{
ptr
=
CreateStringGarbage
(
)
;
FullGCCollect
(
)
;
Assert
.
Throws
<
Finalizer
.
IncorrectRefCountException
>
(
(
)
=>
Finalizer
.
Instance
.
Collect
(
)
)
;
Assert
.
IsTrue
(
called
)
;
}
finally
{
Finalizer
.
Instance
.
IncorrectRefCntResolver
-=
handler
;
}
}
private
static
IntPtr
CreateStringGarbage
(
)
{
PyString
s1
=
new
PyString
(
"test_string"
)
;
// s2 steal a reference from s1
PyString
s2
=
new
PyString
(
s1
.
Handle
)
;
return
s1
.
Handle
;
}
}
}
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