[Openexr-devel] Thread pool bug

[Larry Gritz]

https://github.com/openexr/openexr/blob/91015147e5a6a1914bcb16b12886aede9e1ed065/IlmBase/IlmThread/IlmThreadPool.cpp#L429

In the case where _data->numThreads == 0, in which the response should be to 
let the calling thread execute the task directly, note that it does so while 
still within the stop of the Lock. Therefore multiple threads each reading 
OpenEXR files under this condition will block against each other and refuse to 
read exr files concurrently.

--
Larry Gritz
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