Pessimistic

The Checkout module implements pessimistic locking, which means that content will be exclusively locked whenever a user starts editing it in order to prevent other users to edit it at the same time. The lock will be automatically released when the user saves the content or moves away from the... Platforms: Windows, Mac, *nix, PHP, BSD Solaris

Flashblock is an extension for the Mozilla, Firefox, and Netscape browsers that takes a pessimistic approach to dealing with Macromedia Flash content on a webpage and blocks ALL Flash content from loading. The project leaves placeholders on the webpage that allow you to click to download and then... Platforms: *nix

Acovea implements a genetic algorithm for finding the "best" options for compiling programs with the GCC C and C++ compilers. ACOVEA (Analysis of Compiler Options via Evolutionary Algorithm) implements a genetic algorithm to find the "best" options for compiling programs with the GNU Compiler... Platforms: *nix

This module is unmaintained. See Content Lock for a more viable alternative.Drupal's default content locking strategy is optimistic, that is, two users may start to edit the same content and the one who is hitting the save button first wins the race, while the other is displayed a message stating... Platforms: PHP