Each basic block declares the frame size on entry. If the exiting jump or jump/poll increases the frame size, a stack frame was allocated; if it decreases, it was deallocated. jump/poll implements a safepoint wrt stack overflow, GC and green thread scheduler. 2/
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Frédéric Hamel demonstrates hot code upgrade of distributed code and task migration to a different machine.
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The code was running compiled on an amd64 laptop, and was migrated to run compiled on an ARM raspi, all while running.
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Vyzo presents Gerbil, his language environment on top of Gambit, with a Racket-like module and macro system.
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Barbara Samson and Guillaume Cartier show their portable real-time interactive 3D video and audio environments written in Jazz Scheme on top of Gambit… including an interactive spreadsheet to visualize why UDP packets have being dropped during the interaction's past.
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Guillaume's Jazz Scheme has its own windowing system all written in Scheme, on top of Gambit. The system does everything in OpenGL and is portable to macOS, Windows and Unix/X11, including its own self-debugging graphical debugger.
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Jazz was originally written in C. Rewritten in Scheme in 2 years. The original rewrite was 80x slower than C, because it was doing too many function calls; making them macros to inline code, then adding types—and it's now faster than it was in C. And much more productive.
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