Elliot Handler holds credit for creating the Barbie doll, which debuted in 1959. Ruth named her creation after their daughter Barbara. It remains one of the top-selling dolls on the market. Mattel introduced the talking Chatty Cathy doll in 1960. The Handlers had made a tradition of naming their toys after family members, and when Barbara Handler married Allan Segal, they came out with Allan, Ken's friend. The 1965 talking doll Baby Cheryl was named after the Handlers' first grandchild, and the Todd doll in the Barbie line was named for their grandson. Elliot Handler holds credit for developing the first talking
Interrupt handler interrupts are often provided, which exacerbates stack usage. A primary constraint on the interrupt handler in this programming endeavour is to not exceed the available stack in the worst-case condition, requiring the programmer to reason globally about the stack space requirement of every implemented interrupt handler and application task. When allocated stack space is exceeded (a condition known as a stack overflow), this is not normally detected in hardware by chips of this class. If the stack is exceeded into another writable memory area, the handler will typically work as expected, but the application will fail later (sometimes much later)