A simple C function to submit a block for asynchronous execution on the main queue (main thread).

gistfile1.c

void dispatch_async_on_main_queue(dispatch_block_t block);

/*
 * Submits a block for asynchronous execution on the main queue (main thread).
 */
void dispatch_async_on_main_queue(dispatch_block_t block)
{
  dispatch_async(dispatch_get_main_queue(), block);
}