Ah, I'm a dummy. Forgot to initialize the command queue! No wonder why it

was invalid...

src/CL_Wrapper.cpp

@@ -232,11 +232,12 @@ int CL_Wrapper::store_buffer(cl_mem buffer, std::string buffer_name){
 
 int CL_Wrapper::run_kernel(std::string kernel_name){
 
-    const int WORKER_SIZE = 1;
+    const int WORKER_SIZE = 10;
     size_t global_work_size[1] = { WORKER_SIZE };
 
     cl_kernel kernel = kernel_map.at(kernel_name);
 
+    //error = clEnqueueTask(command_queue, kernel, 0, NULL, NULL);
     error = clEnqueueNDRangeKernel(
             command_queue, kernel,
            1, NULL, global_work_size,

src/main.cpp

@@ -39,18 +39,19 @@ int main(){
     CL_Wrapper c;
     c.acquire_platform_and_device();
     c.create_shared_context();
+    c.create_command_queue();
 
-    c.compile_kernel("../kernels/kernel.txt", true, "hello");
+    c.compile_kernel("../kernels/kernel.c", true, "hello");
     c.compile_kernel("../kernels/minimal_kernel.c", true, "min_kern");
 
     std::string in = "hello!!!!!!!!!!!!!!!!!!!!!";
     cl_mem buff = clCreateBuffer(
             c.getContext(), CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR,
-            sizeof(char) * in.size(), &in, NULL);
+            sizeof(char) * 128, NULL, NULL);
 
     c.store_buffer(buff, "buffer_1");
 
-    //c.set_kernel_arg("min_kern", 0, "buffer_1");
+    c.set_kernel_arg("min_kern", 0, "buffer_1");
     c.run_kernel("min_kern");