mirror of
https://github.com/ruby/ruby.git
synced 2026-10-28 16:36:20 +08:00
Matt Valentine-House
cc3776ba11
The zombie_objspaces table in gc.c kept a page count for each entry and a running total. gc.c asked the GC for the counts through rb_gc_impl_zombie_heap_page_count, and the default GC read the total back through rb_gc_vm_zombie_total_pages and rb_gc_vm_refresh_zombie_pages. Only the default GC uses the numbers, so they crossed the GC API twice for nothing. In this commit we replace both page count functions with one hook, rb_gc_impl_objspace_zombify, which gc.c calls when it parks an objspace in the zombie table. The default GC stores the floored page count in the objspace and keeps the total in the global objspace. objspace_absorb subtracts it again, and each global cycle re-measures the zombies in its snapshot. A nonzero zombie_pages also marks an objspace as a zombie, so the verifier no longer needs rb_gc_vm_zombie_objspace_p. The writers keep the same locks as before: the VM lock for zombify and absorb, the barrier for the refresh. With RGENGC_CHECK_MODE we assert at each global snapshot that zombie_total_pages equals the sum of zombie_pages over the enumerated objspaces.
What is Ruby?
Ruby is an interpreted object-oriented programming language often used for web development. It also offers many scripting features to process plain text and serialized files, or manage system tasks. It is simple, straightforward, and extensible.
Features of Ruby
- Simple Syntax
- Normal Object-oriented Features (e.g. class, method calls)
- Advanced Object-oriented Features (e.g. mix-in, singleton-method)
- Operator Overloading
- Exception Handling
- Iterators and Closures
- Garbage Collection
- Dynamic Loading of Object Files (on some architectures)
- Highly Portable (works on many Unix-like/POSIX compatible platforms as well as Windows, macOS, etc.) cf. https://docs.ruby-lang.org/en/master/maintainers_md.html#label-Platform+Maintainers
How to get Ruby
For a complete list of ways to install Ruby, including using third-party tools like rvm, see:
https://www.ruby-lang.org/en/downloads/
You can download release packages and the snapshot of the repository. If you want to download whole versions of Ruby, please visit https://www.ruby-lang.org/en/downloads/releases/.
Download with Git
The mirror of the Ruby source tree can be checked out with the following command:
$ git clone https://github.com/ruby/ruby.git
There are some other branches under development. Try the following command to see the list of branches:
$ git ls-remote https://github.com/ruby/ruby.git
You may also want to use https://git.ruby-lang.org/ruby.git (actual master of Ruby source) if you are a committer.
How to build
See Building Ruby
Ruby home page
Documentation
Mailing list
There is a mailing list to discuss Ruby. To subscribe to this list, please send the following phrase:
join
in the mail subject (not body) to the address ruby-talk-request@ml.ruby-lang.org.
Copying
See the file COPYING.
Feedback
Questions about the Ruby language can be asked on the Ruby-Talk mailing list or on websites like https://stackoverflow.com.
Bugs should be reported at https://bugs.ruby-lang.org. Read "Reporting Issues" for more information.
Contributing
See "Contributing to Ruby", which includes setup and build instructions.
The Author
Ruby was originally designed and developed by Yukihiro Matsumoto (Matz) in 1995.