8.6 Control Structures – NRE

Miguel’s NRE (Non-Recursive Engine) – Decouples Tcl and C stacks from each other. Enables:

[328][396] coroutine, yield, yieldto

Use cases:

• Implementation of event-driven protocols with straight-line code. Event handling is hidden. Use [info coroutine] as callback to reschedule after yielding. https://core.tcl-lang.org/tcllib/doc/trunk/embedded/www/toc.html#coroutine
• Simulation, independent agents with private state
• Generators. Iterators.
• https://core.tcl-lang.org/tcllib/doc/trunk/embedded/www/toc.html#generator
• http://wiki.tcl-lang.org/39712