Errata: Incorrect num_devices argument in clCreateContext (ch.3, pg.86)

[GoogleCodeExporter]

The fourth argument of the second call to clGetDeviceIDs() is 
“&devices[0]“, which is technically correct but inconsistent with the third 
argument of clCreateContext(), “devices“.

The real errata is the second argument of clCreateContext(), “size / 
sizeof(cl_device_id)“.  Here “size“ is undefined and the argument should 
instead be “num“.  

Original issue reported on code.google.com by Sean.Set...@gmail.com on 19 Aug 2011 at 11:32

[GoogleCodeExporter]

This is also another errata on the same page.  In the line before the second 
call to clGetDeviceIDs(), “alloca(num)“ should be “alloca(num * 
sizeof(cl_device_id))“.

Original comment by Sean.Set...@gmail.com on 19 Aug 2011 at 11:40