Async.h – asynchronous, stackless subroutines in C

Re:Async.h – asynchronous, stackless subroutines in C by naasking on Saturday September 21, 2019 @10:34AM (#21035607)

My intent was to play around with different approaches for Arduino programming. I saw a bunch of blocking functions, like delay(), and thought that seemed silly and made me wish for async/await. I realised at that point that I could do it via macros with the same approach used by protothreads.

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Re:Async.h – asynchronous, stackless subroutines in C by bxparks on Saturday September 21, 2019 @11:58AM (#21036076)

I found that computed-goto (https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html) is cleaner than Duff's Device for this sort of thing. (It works for clang compiler too.) Take a look at https://github.com/bxparks/AceRoutine for an Arduino library that uses computed-goto.

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Re:Async.h – asynchronous, stackless subroutines in C by naasking on Saturday September 21, 2019 @06:36PM (#21038326)

Agreed, definitely more efficient and probably flexible, but two minor downsides:

1. not portable C

2. requires more storage for each continuation (4 bytes vs. 2)

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