Far as restarts vs crashes, Burroughs MCP could do something similar albeit not as impressive or flexible: "To accomplish such enhanced protection, a newer mec

Far as restarts vs crashes, Burroughs MCP could do something similar albeit not as impressive or flexible: "To accomplish such enhanced protection, a newer mechanism was introduced in the mid 1990s. In an unfortunate and misguided attempt at compatibility, it was named after the then-proposed C++ language construct of the same name. Because the syntax and behavior of the two differ to such a large extent, choosing the same name has only led to confusion and misunderstanding. Syntactically, 'try' statements look like 'if' statements: 'try', followed by a statement or block, followed by 'else' and another statement or block. Additional 'else' clauses may follow the first. During execution, if any recoverable termination occurs in the code following the 'try' clause, the stack is cut back if required, and control branches to the code following the first 'else'. In addition, attributes are set to allow the program to determine what happened and where (including the specific line number). Most events that would result in task termination are recoverable. This includes stack overflow, array access out-of-bounds, integer over/under flow, etc. Operator (or user) DS is not recoverable except by privileged tasks using an UNSAFE form of try. MCP thus provides a very fault-tolerant environment, not the crash-and-burn core-dump of other systems."