2. Use the undo and redo commands in Microsoft Office programs. There are three main ways to use the undo and redo commands in Microsoft Office programs on a PC: 1  Click Edit and then select Undo to undo and Repeat to redo. 2  You can find this option on the top left of the toolbar.
seg (plural segs) 1  A metal stud or plate fixed to the sole or heel of a shoe to prevent excessive wear. Also known as a blakey. ( 2 dialect) A callus, an area of hardened skin.
Seg-fault when trying to swapcontext() into a struct member that is stored in a queue. The ucontext_t* cur pointer is dangling, that is why it swapcontext crashes. You could allocate a valid value (new ucontext_t), but it's better to make its type ucontext_t rather than a pointer.