C++11: thread_local or array of OpenCL 1.2 cl_kernel objects?
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Published on 2012-10-07T21:35:22Z
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I need to run several C++11 threads (GCC 4.7.1) parallely in host. Each of them needs to use a device, say a GPU. As per OpenCL 1.2 spec (p. 357):
All OpenCL API calls are thread-safe75 except clSetKernelArg.
clSetKernelArg is safe to call from any host thread, and is safe
to call re-entrantly so long as concurrent calls operate on different
cl_kernel objects. However, the behavior of the cl_kernel object is
undefined if clSetKernelArg is called from multiple host threads on
the same cl_kernel object at the same time.
An elegant way would be to use thread_local cl_kernel objects and the other way I can think of is to use an array of these objects such that i'th thread uses i'th object. As I have not implemented these earlier I was wondering if any of the two are good or are there better ways of getting things done.
TIA, S
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