clSetKernelArg throwing EXC_BAD_ACCESS

Question

I'm working through the HelloWorld example in the OpenCl Programming Guide and I keep getting an EXC_BAD_ACCESS when I try to run this function (clSetKernelArg). The look of my function is basically...

clSetKernelArg(mKernel, 0, sizeof(cl_mem), mMemObject[0]);

In the debugger everything looks to be instantiated. There's nothing null inside of the parenthesis and I'm all out of ideas. Any help would be greatly appreciated.

Answer 1

If you are going trough an OpenCL Hello World example I am almost certain that you do not have

cl_mem * mMemObject[foo]

That would be the only thing that would make the mMemObject[0] declaration legal. EXC_BAD_ACCESS implies that you are dereferencing an invalid pointer, and this implies that your mMemObject is just cl_mem.

This works if you have declared mMemObject simply with cl_mem mMemObject:

clSetKernelArg(mKernel, 0, sizeof(cl_mem), &mMemObject);