c50d2753c0
Implement place channels and messages, and change `place-enabled?` to claim that places are enabled, but `processor-count` still reports 1. The implementation of place channels has an interesting use of ephemerons --- that is, a use that isn't just solving a key-in-value problem. Using epehemerons solves the problem of forgetting a place channel and any thread blocked on the read end when there are no producers on the write end. Along similar lines, when only the write end is retained (i.e., no readers), the channel data is forgotten and writes become a no-op. The read end holds a "read key" and references the channel data through an ephemeron keyed by a "write key"; the write end similarly holds a "write key" and uses an ephemeron keyed by the "read key". This use of an epehemeron implements a reachability "and": retain the place-channel data only if the read end *and* the write end are both reachable. (Minor point: a read end also holds onto the "write key" anytime the channel already has data.) |
||
|---|---|---|
| pkgs | ||
| racket | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .travis.yml | ||
| appveyor.yml | ||
| INSTALL.txt | ||
| Makefile | ||
| README.md | ||
This is the source code for the core of Racket. See "INSTALL.txt" for full information on building Racket.
To build the full Racket distribution from this repository, run make
in the top-level directory. To build minimal Racket, run make base.
The rest of the Racket distribution source code is in other repositories, mostly under the Racket GitHub organization.
Contribute to Racket by submitting a pull request, joining the development mailing list, or visiting the IRC channel.
License
Racket Copyright (c) 2010-2018 PLT Design Inc.
Racket is distributed under the GNU Lesser General Public License (LGPL). This implies that you may link Racket into proprietary applications, provided you follow the rules stated in the LGPL. You can also modify Racket; if you distribute a modified version, you must distribute it under the terms of the LGPL, which in particular states that you must release the source code for the modified software.
See racket/src/COPYING_LESSER.txt for more information.