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Overview
| Comment: | Add custom locking semantics for the CriticalHandle derived classes when compiled for the .NET Compact Framework. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
b8212344a0dc6e3769d8d81728c73702 |
| User & Date: | mistachkin 2012-10-04 11:21:36 |
Context
|
2012-10-05
| ||
| 00:17 | More refinements to disposal locking semantics on the .NET Compact Framework. check-in: ac5f4cc084 user: mistachkin tags: trunk | |
|
2012-10-04
| ||
| 11:21 | Add custom locking semantics for the CriticalHandle derived classes when compiled for the .NET Compact Framework. check-in: b8212344a0 user: mistachkin tags: trunk | |
|
2012-09-24
| ||
| 20:48 | Doc updates for Visual Studio 2012. check-in: e7339793f8 user: mistachkin tags: trunk | |
Changes
Changes to System.Data.SQLite/UnsafeNativeMethods.cs.
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get;
}
}
#endif
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get;
}
}
#endif
///////////////////////////////////////////////////////////////////////////
#region SQLiteConnectionHandle Class
// Handles the unmanaged database pointer, and provides finalization
// support for it.
internal class SQLiteConnectionHandle : CriticalHandle
{
#if PLATFORM_COMPACTFRAMEWORK
private readonly object syncRoot = new object();
#endif
///////////////////////////////////////////////////////////////////////
public static implicit operator IntPtr(SQLiteConnectionHandle db)
{
if (db != null)
{
#if PLATFORM_COMPACTFRAMEWORK
lock (db.syncRoot)
#endif
{
return db.handle;
}
}
return IntPtr.Zero;
}
///////////////////////////////////////////////////////////////////////
internal SQLiteConnectionHandle(IntPtr db)
: this()
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
SetHandle(db);
}
}
///////////////////////////////////////////////////////////////////////
private SQLiteConnectionHandle()
: base(IntPtr.Zero)
{
}
///////////////////////////////////////////////////////////////////////
protected override bool ReleaseHandle()
{
try
{
#if !PLATFORM_COMPACTFRAMEWORK
IntPtr localHandle = Interlocked.Exchange(
ref handle, IntPtr.Zero);
if (localHandle != IntPtr.Zero)
SQLiteBase.CloseConnection(this, localHandle);
#if !NET_COMPACT_20 && TRACE_HANDLE
try
{
Trace.WriteLine(String.Format(
"CloseConnection: {0}", localHandle));
}
catch
{
}
#endif
#else
lock (syncRoot)
{
if (handle != IntPtr.Zero)
{
SQLiteBase.CloseConnection(this, handle);
SetHandle(IntPtr.Zero);
}
}
#endif
#if DEBUG
return true;
#endif
}
#if !NET_COMPACT_20 && TRACE_HANDLE
catch (SQLiteException e)
#else
catch (SQLiteException)
#endif
{
#if !NET_COMPACT_20 && TRACE_HANDLE
try
{
Trace.WriteLine(String.Format(
"CloseConnection: {0}, exception: {1}",
handle, e));
}
catch
{
}
#endif
}
finally
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
SetHandleAsInvalid();
}
}
#if DEBUG
return false;
#else
return true;
#endif
}
///////////////////////////////////////////////////////////////////////
public override bool IsInvalid
{
get
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
return (handle == IntPtr.Zero);
}
}
}
///////////////////////////////////////////////////////////////////////
#if DEBUG
public override string ToString()
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
return handle.ToString();
}
}
#endif
}
#endregion
///////////////////////////////////////////////////////////////////////////
#region SQLiteStatementHandle Class
// Provides finalization support for unmanaged SQLite statements.
internal class SQLiteStatementHandle : CriticalHandle
{
#if PLATFORM_COMPACTFRAMEWORK
private readonly object syncRoot = new object();
#endif
///////////////////////////////////////////////////////////////////////
private SQLiteConnectionHandle cnn;
///////////////////////////////////////////////////////////////////////
public static implicit operator IntPtr(SQLiteStatementHandle stmt)
{
if (stmt != null)
{
#if PLATFORM_COMPACTFRAMEWORK
lock (stmt.syncRoot)
#endif
{
return stmt.handle;
}
}
return IntPtr.Zero;
}
///////////////////////////////////////////////////////////////////////
internal SQLiteStatementHandle(SQLiteConnectionHandle cnn, IntPtr stmt)
: this()
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
this.cnn = cnn;
SetHandle(stmt);
}
}
///////////////////////////////////////////////////////////////////////
private SQLiteStatementHandle()
: base(IntPtr.Zero)
{
}
///////////////////////////////////////////////////////////////////////
protected override bool ReleaseHandle()
{
try
{
#if !PLATFORM_COMPACTFRAMEWORK
IntPtr localHandle = Interlocked.Exchange(
ref handle, IntPtr.Zero);
if (localHandle != IntPtr.Zero)
SQLiteBase.FinalizeStatement(cnn, localHandle);
#if !NET_COMPACT_20 && TRACE_HANDLE
try
{
Trace.WriteLine(String.Format(
"FinalizeStatement: {0}", localHandle));
}
catch
{
}
#endif
#else
lock (syncRoot)
{
if (handle != IntPtr.Zero)
{
SQLiteBase.FinalizeStatement(cnn, handle);
SetHandle(IntPtr.Zero);
}
}
#endif
#if DEBUG
return true;
#endif
}
#if !NET_COMPACT_20 && TRACE_HANDLE
catch (SQLiteException e)
#else
catch (SQLiteException)
#endif
{
#if !NET_COMPACT_20 && TRACE_HANDLE
try
{
Trace.WriteLine(String.Format(
"FinalizeStatement: {0}, exception: {1}",
handle, e));
}
catch
{
}
#endif
}
finally
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
SetHandleAsInvalid();
}
}
#if DEBUG
return false;
#else
return true;
#endif
}
///////////////////////////////////////////////////////////////////////
public override bool IsInvalid
{
get
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
return (handle == IntPtr.Zero);
}
}
}
///////////////////////////////////////////////////////////////////////
#if DEBUG
public override string ToString()
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
return handle.ToString();
}
}
#endif
}
#endregion
///////////////////////////////////////////////////////////////////////////
#region SQLiteBackupHandle Class
// Provides finalization support for unmanaged SQLite backup objects.
internal class SQLiteBackupHandle : CriticalHandle
{
#if PLATFORM_COMPACTFRAMEWORK
private readonly object syncRoot = new object();
#endif
///////////////////////////////////////////////////////////////////////
private SQLiteConnectionHandle cnn;
///////////////////////////////////////////////////////////////////////
public static implicit operator IntPtr(SQLiteBackupHandle backup)
{
if (backup != null)
{
#if PLATFORM_COMPACTFRAMEWORK
lock (backup.syncRoot)
#endif
{
return backup.handle;
}
}
return IntPtr.Zero;
}
///////////////////////////////////////////////////////////////////////
internal SQLiteBackupHandle(SQLiteConnectionHandle cnn, IntPtr backup)
: this()
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
this.cnn = cnn;
SetHandle(backup);
}
}
///////////////////////////////////////////////////////////////////////
private SQLiteBackupHandle()
: base(IntPtr.Zero)
{
}
///////////////////////////////////////////////////////////////////////
protected override bool ReleaseHandle()
{
try
{
#if !PLATFORM_COMPACTFRAMEWORK
IntPtr localHandle = Interlocked.Exchange(
ref handle, IntPtr.Zero);
if (localHandle != IntPtr.Zero)
SQLiteBase.FinishBackup(cnn, localHandle);
#if !NET_COMPACT_20 && TRACE_HANDLE
try
{
Trace.WriteLine(String.Format(
"FinishBackup: {0}", localHandle));
}
catch
{
}
#endif
#else
lock (syncRoot)
{
if (handle != IntPtr.Zero)
{
SQLiteBase.FinishBackup(cnn, handle);
SetHandle(IntPtr.Zero);
}
}
#endif
#if DEBUG
return true;
#endif
}
#if !NET_COMPACT_20 && TRACE_HANDLE
catch (SQLiteException e)
#else
catch (SQLiteException)
#endif
{
#if !NET_COMPACT_20 && TRACE_HANDLE
try
{
Trace.WriteLine(String.Format(
"FinishBackup: {0}, exception: {1}",
handle, e));
}
catch
{
}
#endif
}
finally
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
SetHandleAsInvalid();
}
}
#if DEBUG
return false;
#else
return true;
#endif
}
///////////////////////////////////////////////////////////////////////
public override bool IsInvalid
{
get
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
return (handle == IntPtr.Zero);
}
}
}
///////////////////////////////////////////////////////////////////////
#if DEBUG
public override string ToString()
{
#if PLATFORM_COMPACTFRAMEWORK
lock (syncRoot)
#endif
{
return handle.ToString();
}
}
#endif
}
#endregion
}
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