gpgpu - OpenCL to search array and set a flag -

i'm brand new using opencl, , seems should simple, bear me.

i'm writing simple kernel scan array , particular value. if value found anywhere in array, i'd flag set. if value not found, flag should remain 0;

currently i'm creating cl_mem object hold int

    cl_mem outputflag = clcreatebuffer(mclcontext, cl_mem_write_only, sizeof(cl_int), null, null); 

setting kernel argument

    clsetkernelarg(mclkernels[1],1, sizeof(cl_mem), &outputflag); 

and executing kernel looks like:

__kernel void checkforhole(__global uchar *image , __global int found, uchar holevalue) {     int = get_global_id(0);     int j = get_global_id(1);      uchar sample = image[i*j];      if (sample == holevalue) {         found = 1;     }    } 

note array 2d, though shouldn't matter.

when put printf statement inside found condition, called (the value found). when read value via:

 cl_int result;  errorcode = clenqueuereadbuffer(mclcommandqueue, outputflag, cl_true                                 , 0, sizeof(cl_int), &result, 0, null, null); 

i 0. there proper way set flag in opencl? nice if there way halt entire execution , return value if found.

can write bool return type kernel , return true?

thanks!

in kernel output flag should pointer int.

change kernel parameter __global int *found

i seem figure out issues writing them here....

if knows way halt execution though, or if it's possible, i'd still interested :)