On Tue, Jan 24, 2017 at 12:46 PM, josvazg <josv...@gmail.com> wrote: > > Golang runtime has been fully translated to Go for a while now. I know I > could just read the source code directly but... > > Is there any known or recommended documentation (talk, slides, article) > about the runtime Go code?
Not really. It changes pretty quickly so any such docs would be more or less out of date. > I am specially interested in anything that describes the Golang runtime > language subset restrictions: Mostly the code is written carefully by people who understand the compiler. > How does it avoid the GC? (while it's implementing it) By not allocating memory. It is helped by a "secret" compiler option, -+. When that compiler option is used, the compiler gives an error for any implicit memory allocation. Note that this is not a change to the language, it is, as you say, a subset of the language: operations that implicitly allocate memory are forbidden. > Uses the GC primitives it provides at a lower level? A kind of its own > malloc/free? There is a kind of simple malloc (but not free) in the `persistentalloc` function. > Ensures all is in the heap? Not sure what you mean there. > Does it avoid goroutines as well? how? Uses plain threads directly? The runtime avoids goroutines (except in a few places) by simply not using the `go` statement. The runtime uses plain threads to implement goroutines, but otherwise does not use threads. > What other restrictions apply compared to "userland" Golang? The code that handles stacks can not itself use unlimited stack space. The linker checks that it lives within the limited bounds available. > Why wouldn't the runtime subset be suitable for OS internals or real-time? It could be. > Why wouldn't it be interesting to define a GolangRT subset language > formally? It's a fairly limited language. I'm not sure why anybody would want to use it if they weren't already using Go. Ian -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
