# Posix\_mq - POSIX message queues for Ruby **URL:** \ **Category:** Ruby\ **Created:** [January 2, 2010, 1:20pm UTC](https://www.ruby-forum.com/t/posix-mq-posix-message-queues-for-ruby/180971 "2010-01-02T13:20:31Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![ericw](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/97f17d/32.png) [@ericw](https://www.ruby-forum.com/u/ericw)\ **Post date:** [January 2, 2010, 1:20pm UTC](https://www.ruby-forum.com/t/posix-mq-posix-message-queues-for-ruby/180971/1 "2010-01-02T13:20:31Z")
POSIX message queues allow local processes to exchange data in the form of messages. This API is distinct from that provided by System V message queues, but provides similar functionality. - [posix\_mq - POSIX message queues for Ruby](http://bogomips.org/ruby_posix_mq/) - removed\_email\_address@domain.invalid - git://git.bogomips.org/ruby\_posix\_mq.git POSIX message queues may be implemented in the kernel for fast, low-latency communication between processes on the same machine. POSIX message queues are not intended to replace userspace, network-aware message queue implementations. == Features - Supports message notifications via signals. - Supports portable non-blocking operation. Under Linux 2.6.6+ only, POSIX\_MQ objects may even be used with event notification mechanisms such as IO.select. - Optional timeouts may be applied to send and receive operations. - Thread-safe under Ruby 1.9, releases GVL before blocking operations. - Documented library API - Includes a generic “posix-mq.rb” command-line tool with manpage. == Install Operating system support (or library emulation) for POSIX message queues is required. Most modern GNU/Linux distributions support this out-of-the-box. If you’re using a packaged Ruby distribution, make sure you have a C compiler and the matching Ruby development libraries and headers. If you plan on using the command-line client, a tarball installation starts up faster and is recommended. Just grab the tarball from: [http://bogomips.org/ruby\_posix\_mq/files/](http://bogomips.org/ruby_posix_mq/files/) Unpack it, and run “ruby setup.rb” Otherwise, via RubyGems: gem install posix\_mq == Development You can get the latest source via git from the following locations: git://git.bogomips.org/ruby\_posix\_mq.git git://repo.or.cz/ruby\_posix\_mq.git (mirror) You may browse the code from the web and download the latest snapshot tarballs here: - [POSIX message queues for Ruby](http://git.bogomips.org/cgit/ruby_posix_mq.git) (cgit) - [Public Git Hosting - ruby\_posix\_mq.git/summary](http://repo.or.cz/w/ruby_posix_mq.git) (gitweb) Inline patches (from “git format-patch”) to the mailing list are preferred because they allow code review and comments in the reply to the patch. We will adhere to mostly the same conventions for patch submissions as git itself. See the Documentation/SubmittingPatches document distributed with git on on patch submission guidelines to follow. Just don’t email the git mailing list or maintainer with posix\_mq patches. == Contact All feedback (bug reports, user/development discussion, patches, pull requests) go to the mailing list: [mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![ericw](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/97f17d/32.png) [@ericw](https://www.ruby-forum.com/u/ericw)\ **Post date:** [January 3, 2010, 6:58am UTC](https://www.ruby-forum.com/t/posix-mq-posix-message-queues-for-ruby/180971/2 "2010-01-03T06:58:43Z")
POSIX message queues allow local processes to exchange data in the form of messages. This API is distinct from that provided by System V message queues, but provides similar functionality. - [posix\_mq - POSIX message queues for Ruby](http://bogomips.org/ruby_posix_mq/) - removed\_email\_address@domain.invalid - git://git.bogomips.org/ruby\_posix\_mq.git POSIX message queues may be implemented in the kernel for fast, low-latency communication between processes on the same machine. POSIX message queues are not intended to replace userspace, network-aware message queue implementations. Changes: This release fixes notification (un)registration and should be fully-supported on modern FreeBSD (7.2+) releases. POSIX\_MQ#notify=nil correctly unregister notification requests. POSIX\_MQ#notify=false now provides the no-op SIGEV\_NONE functionality. Under FreeBSD, using IO.select on POSIX\_MQ objects is now possible as it has always been under Linux.