UpStare

The program code and the program state are updated immediately in a single step.

It is not necessary to wait indefinitely for a quiescent program state. A running algorithm can be updated midstream its execution and resumed from a different point (not necessarily the beginning) of another algorithm.

Features:

• Recursion:
• Updating an application recursively computing Fibonacci numbers, while nested deep in the stack, to report additional information when the recursion unwinds.
• Network Sockets:
• Updating a server application while serving multiple clients without closing the network socket.
• Multi-threaded Applications:
• Updating the main function body executed by multiple threads of an application. Also, updating in a producer/consumer multi-threaded application only the consumer threads while the producer threads remained unmodified.
• Multi-nested Long-Lived Loops:
• Updating in the middle of executing Bubblesort, a multi-nested long-lived loop, to continue executing from the middle of a different multi-nested long-lived loop implementing Selectionsort while reusing the existing program state. Additionally, updating from Bubblesort to Heapsort, which is a drastically different sorting algorithm executing over different loop iterators.
• vsFTPd:
• Updating the multi-process (forked processes do not communicate) vsFTPd 2.0.4 server while serving 50 clients.
• PostgreSQL:
• Updating the multi-process (forked processes communicate) PostgreSQL 7.4.16 database server while serving 50 clients.

What is new in this release:

• This version was compiled with debugging statements disabled for performance.
• Parts of the documentation on preparing dynamic updates were corrected.

What is new in version 0.12.8:

• This version improves the patch generator to account for temporary variables produced by the blocking system calls transformation, corrects a recurrent unwind error when application functions are called within a transformer, and improves the documentation on preparing dynamic updates.

What is new in version 0.10.9:

• This release considerably improves the ability of the patch generator to automatically produce stack transformers and incorporate user-defined stack transformers.
• It also implements support for blocking system calls in a much more efficient way.