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Lock disposal of separate gdi+ objects under different threads since this prevents malloc heap corruption seen under Ubuntu 10.04.1 and 11.04 - probably a libcairo issue 

In testing, it appears that if multiple threads dispose of separate GDI+ objects simultaneously,
the native malloc heap can become corrupted, possibly due to a double free().  This may be due to
bugs in the underlying libcairo used by mono's libgdiplus.dll on Linux/OSX.  These problems were
seen with both libcario 1.10.2-6.1ubuntu3 and 1.8.10-2ubuntu1.  They go away if disposal is perfomed
under lock.
integration
Justin Clark-Casey (justincc) 2012-08-22 23:04:17 +01:00
parent 568de9313a
commit 1369058280
1 changed files with 43 additions and 27 deletions
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16
OpenSim/Region/CoreModules/Scripting/VectorRender/VectorRenderModule.cs
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@ -307,6 +307,13 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
Graphics graph = null;
try
{
// XXX: In testing, it appears that if multiple threads dispose of separate GDI+ objects simultaneously,
// the native malloc heap can become corrupted, possibly due to a double free(). This may be due to
// bugs in the underlying libcairo used by mono's libgdiplus.dll on Linux/OSX. These problems were
// seen with both libcario 1.10.2-6.1ubuntu3 and 1.8.10-2ubuntu1. They go away if disposal is perfomed
// under lock.
lock (this)
{
if (alpha == 256)
bitmap = new Bitmap(width, height, PixelFormat.Format32bppRgb);
@ -337,6 +344,7 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
}
GDIDraw(data, graph, altDataDelim);
}
byte[] imageJ2000 = new byte[0];
@ -354,6 +362,13 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
m_textureManager.ReturnData(id, imageJ2000);
}
finally
{
// XXX: In testing, it appears that if multiple threads dispose of separate GDI+ objects simultaneously,
// the native malloc heap can become corrupted, possibly due to a double free(). This may be due to
// bugs in the underlying libcairo used by mono's libgdiplus.dll on Linux/OSX. These problems were
// seen with both libcario 1.10.2-6.1ubuntu3 and 1.8.10-2ubuntu1. They go away if disposal is perfomed
// under lock.
lock (this)
{
if (graph != null)
graph.Dispose();
@ -362,6 +377,7 @@ namespace OpenSim.Region.CoreModules.Scripting.VectorRender
bitmap.Dispose();
}
}
}
private int parseIntParam(string strInt)
{