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Add threads survey #17

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Add threads survey #17

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0ae9bac
Start threads survey
lassik Aug 31, 2021
4d4e5d8
Expand threads survey
lassik Aug 31, 2021
be81357
Explain thread types
lassik Aug 31, 2021
44f8e36
Update based on mailing list
lassik Aug 31, 2021
7e3ad31
Add more stuff
lassik Aug 31, 2021
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44 changes: 44 additions & 0 deletions surveys/threads.md
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# Threads

Using _OS threads_, also known as _native threads_, there is exactly
one operating system thread for each virtual machine thread.

Using _virtual threads_, also known as _green threads_ (after the
_Green Team_ working on Java at Sun), each OS thread can switch
between multiple VM threads using co-operative multitasking. The
threads visible to the Scheme program are the VM threads; the OS
threads are an internal implementation detail.

|Scheme|Standard API|Custom API|OS threads|Virtual threads|Re-entrant interpreter
|------|------------|----------|----------|---------------|----------------------
|Bigloo|SRFI 18|?|["POSIX threads"][bigloo-pthread]|["Fair threads"][bigloo-fthread]|?
|Chez Scheme|?|?|?|?|?
|Chibi-Scheme|?|?|?|?|?
|CHICKEN|SRFI 18|?|Yes|No|?|?|?
|Cyclone|SRFI 18*|?|No|pthreads|?|?|?
|Gambit|SRFI 18|?|Yes|No|?|?|?
|Gauche|SRFI 18|?|No|pthreads, Win32|?|?|?
|Gerbil|?|?|?|?|?
|Guile|SRFI 18|[Here][guile-custom]|[pthreads][guile-pthreads]|[`(ice-9 futures)`][guile-futures]|Yes
|IronScheme|?|?|?|?|?
|Kawa|?|?|?|?|?
|Larceny|?|?|?|?|?
|Loko|?|?|?|?|?
|MIT Scheme|?|?|?|?|?
|Racket|?|?|?|?|?
|Sagittarius|?|?|?|?|?
|Scheme48|?|?|?|?|?
|STKlos|SRFI 18|?|No|pthreads|Yes
|TinyScheme|No|?|?|?|?|Yes
|Unsyntax|?|?|?|?|?
|Vicare|?|?|?|?|?
|Ypsilon|?|?|Yes|?|?

*) Partial support

[bigloo-fthread]: https://www-sop.inria.fr/mimosa/fp/Bigloo/manual-chapter16.html#Fair%20Threads
[bigloo-pthread]: [https://www-sop.inria.fr/mimosa/fp/Bigloo/manual-chapter16.html#Posix%20Threads]

[guile-pthreads]: https://www.gnu.org/software/guile/manual/html_node/Scheduling.html
[guile-custom]: https://www.gnu.org/software/guile/manual/html_node/Threads.html
[guile-futures]: https://www.gnu.org/software/guile/manual/html_node/Futures.html
3 changes: 2 additions & 1 deletion www-index.scm
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"minischeme-history"
"optionality"
"scheme-on-windows"
"standalone-executables")
"standalone-executables"
"threads")

("Macros"
"macroexpand"
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