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pythonnet/src/runtime/pyreferencedecrementer.cs at featured · SanityLacking/pythonnet · GitHub
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runtime
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runtime
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pyreferencedecrementer.cs
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using
System
;
using
System
.
Collections
.
Concurrent
;
using
System
.
Collections
.
Generic
;
using
System
.
Diagnostics
;
using
System
.
Threading
;
using
System
.
Threading
.
Tasks
;
namespace
Python
.
Runtime
{
/// <summary>
/// Background python objects reference decrementer.
/// !!! By some unknown reasons python references decrements have been performed in the GC thread - affects GC. !!!
/// This component contains background thread with the queue of IntPtr python object references.
/// Finalizers should schedule reference decrement operation in this component to avoid problem with GC.
/// Each PythonEngine Init/Shutdown have it's own PyReferenceDecrementer, so PyObject should also have a field with the
/// reference to the correct PyReferenceDecrementer.
/// </summary>
internal
class
PyReferenceDecrementer
:
IDisposable
{
private
static
readonly
DedicatedThreadTaskScheduler
DedicatedThreadTaskScheduler
=
new
DedicatedThreadTaskScheduler
(
)
;
private
readonly
BlockingCollection
<
IntPtr
>
_asyncDecRefQueue
=
new
BlockingCollection
<
IntPtr
>
(
)
;
private
CancellationTokenSource
_cts
;
private
CancellationToken
_ct
;
private
Task
_backgroundWorkerTask
;
public
PyReferenceDecrementer
(
)
{
InitDecRefThread
(
)
;
}
public
void
ScheduleDecRef
(
IntPtr
pyRef
)
{
// ReSharper disable once MethodSupportsCancellation
_asyncDecRefQueue
.
Add
(
pyRef
)
;
}
internal
void
WaitForPendingDecReferences
(
)
{
ShutdownDecRefThread
(
)
;
InitDecRefThread
(
)
;
}
private
void
ShutdownDecRefThread
(
)
{
_cts
?
.
Cancel
(
)
;
try
{
IntPtr
ts
=
IntPtr
.
Zero
;
if
(
Runtime
.
PyGILState_GetThisThreadState
(
)
!=
IntPtr
.
Zero
)
{
ts
=
Runtime
.
PyEval_SaveThread
(
)
;
}
try
{
// ReSharper disable once MethodSupportsCancellation
_backgroundWorkerTask
.
Wait
(
)
;
}
catch
(
AggregateException
ex
)
{
if
(
!
(
ex
.
InnerException
is
OperationCanceledException
)
)
{
throw
;
}
}
finally
{
if
(
ts
!=
IntPtr
.
Zero
)
{
Runtime
.
PyEval_RestoreThread
(
ts
)
;
}
}
}
catch
{
// Just stopping background thread.
}
_cts
=
null
;
_ct
=
default
(
CancellationToken
)
;
_backgroundWorkerTask
=
null
;
}
private
void
InitDecRefThread
(
)
{
_cts
=
new
CancellationTokenSource
(
)
;
_ct
=
_cts
.
Token
;
_backgroundWorkerTask
=
Task
.
Factory
.
StartNew
(
WorkerThread
,
_ct
,
TaskCreationOptions
.
LongRunning
,
DedicatedThreadTaskScheduler
)
;
}
private
void
WorkerThread
(
)
{
while
(
true
)
{
IntPtr
refToDecrease
=
_asyncDecRefQueue
.
Take
(
_ct
)
;
;
try
{
IntPtr
gs
=
PythonEngine
.
AcquireLock
(
)
;
try
{
do
{
Runtime
.
XDecref
(
refToDecrease
)
;
}
while
(
_asyncDecRefQueue
.
TryTake
(
out
refToDecrease
)
)
;
}
finally
{
PythonEngine
.
ReleaseLock
(
gs
)
;
}
}
catch
{
// Nothing to do in this case.
}
}
}
public
void
Dispose
(
)
{
ShutdownDecRefThread
(
)
;
}
}
/// <summary>
/// Scheduler that uses only one thread for all scheduled task.
/// </summary>
internal
class
DedicatedThreadTaskScheduler
:
TaskScheduler
{
private
readonly
BlockingCollection
<
Task
>
_queuedTasks
=
new
BlockingCollection
<
Task
>
(
)
;
/// <summary>
/// Initializes a new instance of the <see cref="DedicatedThreadTaskScheduler"/> class.
/// </summary>
public
DedicatedThreadTaskScheduler
(
)
{
var
thread
=
new
Thread
(
WorkerThreadProc
)
;
thread
.
IsBackground
=
true
;
thread
.
Start
(
)
;
}
/// <inheritdoc/>
protected
override
IEnumerable
<
Task
>
GetScheduledTasks
(
)
{
return
_queuedTasks
;
}
/// <inheritdoc/>
protected
override
void
QueueTask
(
Task
task
)
{
_queuedTasks
.
Add
(
task
)
;
}
/// <inheritdoc/>
protected
override
bool
TryExecuteTaskInline
(
Task
task
,
bool
taskWasPreviouslyQueued
)
{
return
false
;
}
private
void
WorkerThreadProc
(
)
{
for
(
;
;
)
{
Task
dequeuedTask
=
_queuedTasks
.
Take
(
)
;
// This is synchronous execution.
bool
taskExecuted
=
TryExecuteTask
(
dequeuedTask
)
;
Debug
.
Assert
(
taskExecuted
,
"DedicatedThread task have some problem."
)
;
}
}
}
}
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