clCreateProgramWithSource error

Accelerated Computing CUDA CUDA Programming and Performance
1

Hello,

I’m getting “Access violation reading location 0x4c432f2f” when trying to create a program from source. My code looks like this:

char * source = "__kernel void VectorAdd(__global const float* a, __global const float* b, \

__global float* c, int iNumElements)\

{\

   some CL code here\

}";

szKernelLength = strlen(source); //szKernelLength is of size_t type

cpProgram = clCreateProgramWithSource(cxGPUContext, 1, (const char **)source, &szKernelLength, &ciErr1);

I have no idea, whats wrong. I’ve also copy-pasted two support functions (shrFindFilePath and oclLoadProgSource) from SDK source files to do the job, but the result was the same…

Any help would be greatly appreciated

2

In the last statement, instead of

(char**)source

you need

(char**)&source
3

Thank You! This just saved my day…

4

I got another problem, this time with clBuildProgram… it returns “1”, which does not correspond to any return value mentioned in the specs. Code here:

[url=“http://pastebin.com/f563a6893”]http://pastebin.com/f563a6893[/url]
(I coulnt make it show the code, each time I was redirected to the main page, so pastebin…)

I tried to query the context, source code and the number of devices of the program using clGetProgramInfo, acquired values matched, so I guss that program created with clCreateProgramWithSource is OK. But when I tried to query binary size, I got zero, so the build was unsuccessful. Any ideas? And is there any way to see compile output? Thanks in advance…

5

See this. Then, use clGetProgramBuildInfo() to lookup syntax errors in your OpenCL code.

6

Just add this after the clBuildProgram to catch syntax problem

if (ciErr1 != CL_SUCCESS)

{

		size_t ret_val_size;

		char *build_log = NULL;

		clGetProgramBuildInfo(cpProgram, cdDevices, CL_PROGRAM_BUILD_LOG, 0, NULL, &ret_val_size);

		build_log = (char *) calloc(ret_val_size + 1, sizeof(char));

		clGetProgramBuildInfo(cpProgram, cdDevicesInfo, CL_PROGRAM_BUILD_LOG, ret_val_size, build_log, NULL);

		build_log[ret_val_size] = '

if (ciErr1 != CL_SUCCESS)

{

	size_t ret_val_size;

	char *build_log = NULL;

	clGetProgramBuildInfo(cpProgram, cdDevices, CL_PROGRAM_BUILD_LOG, 0, NULL, &ret_val_size);

	build_log = (char *) calloc(ret_val_size + 1, sizeof(char));

	clGetProgramBuildInfo(cpProgram, cdDevicesInfo, CL_PROGRAM_BUILD_LOG, ret_val_size, build_log, NULL);

	build_log[ret_val_size] = '\0';

	printf("%s", build_log);

	free(build_log);

}

';

		printf("%s", build_log);

		free(build_log);

}