Dear everybody, As Firefox moves each day more to an asynchronous execution model, we keep facing issues related to dependencies between tasks. Here are a few examples: 1. component A can only be initialized one or more other components have reached some state; 2. off main thread I/O should only be shutdown once all components that can use it have reached a state in which they don't need it anymore; 3. private browsing should be displayed only once the state of the session has been (asynchronously) saved.
In our codebase, most of the synchronization is done through the observer service. While this service has proved very useful, it is also quite limited. For instance, using this service to implement a dependency for scenario 2. above is rather tricky. So, perhaps it is time to start working on a library (or at least a design guideline) that will simplify our work refactoring Firefox into asynchronicity. As a base for discussion, I have put together a small RFC based on promises: https://wiki.mozilla.org/RFC/TaskDependencies Cheers, David -- David Rajchenbach-Teller, PhD Performance Team, Mozilla
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