Function ocl::ffi::clCreateContext

pub unsafe extern "system" fn clCreateContext(properties: *const isize,
                                              num_devices: u32,
                                              devices: *const *mut c_void,
                                              pfn_notify: Option<extern fn(*const i8, *const c_void, usize, *mut c_void)>,
                                              user_data: *mut c_void,
                                              errcode_ret: *mut i32)
                                              -> *mut c_void