The atomic_ops library (
IN NEW CODE, PLEASE USE C11 OR C++14 STANDARD ATOMICS INSTEAD OF THIS PACKAGE.
This is version 7.7.0 (next release development) of libatomic_ops.
Also, the latest bug fixes and new features are available in the development repository.
This package provides semi-portable access to hardware-provided atomic memory update operations on a number of architectures. These might allow you to write code:
That does more interesting things in signal handlers.
Makes more effective use of multiprocessors by allowing you to write clever lock-free code. Note that such code is very difficult to get right, and will unavoidably be less portable than lock-based code. It is also not always faster than lock-based code. But it may occasionally be a large performance win.
To experiment with new and much better thread programming paradigms, etc.
For details and licensing restrictions see the files in the "doc" subdirectory.
Installation and Usage
The configuration and build scripts for this package were generated by
./configure; make; sudo make install in this
directory should work. For a more customized build, see the output of
./configure --help. To build it from the development repository,
./autogen.sh should be executed first.
Note that much of the content of this library is in the header files. However, two small libraries are built and installed:
libatomic_ops.ais a support library, which is not needed on some platforms. This is intended to be usable, under some mild restrictions, in free or proprietary code, as are all the header files. See doc/LICENSING.txt.
libatomic_ops_gpl.acontains some higher level facilities. This code is currently covered by the GPL. The contents currently correspond to the headers
Platform Specific Notes
Win32/64: src/Makefile.msft contains a very simple Makefile for building
and running tests and building the gpl library. The core
implementation is entirely in header files.
aCC -Ae won't work as a C compiler, since it doesn't support
inline assembly code. Use cc.
Feedback, Contribution, Questions and Notifications
Please address bug reports and new feature ideas to GitHub issues. Before the submission please check that it has not been done yet by someone else.
If you want to contribute, submit a pull request to GitHub.
If you need help, use
Older questions on the site can be found by
Older technical discussions are also available in
bdwgc mailing list
archive - it can be downloaded as a
or browsed at Narkive (please search
for atomic keyword).
To get new release announcements, subscribe to RSS feed. (To receive the notifications by email, a 3rd-party free service like IFTTT RSS Feed can be setup.) To be notified on all issues, please watch the project on GitHub.
Copyright & Warranty
- Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
- Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
- Copyright (c) 1999-2011 Hewlett-Packard Development Company, L.P.
- Copyright (c) 2008-2018 Ivan Maidanski
The file armcc/arm_v6.h is also
- Copyright (c) 2007 by NEC LE-IT. All rights reserved.
The file gcc/avr32.h is
- Copyright (c) 2009 Bradley Smith email@example.com
The file gcc/mips.h is
- Copyright (c) 2005, 2007 Thiemo Seufer firstname.lastname@example.org
The file gcc/sh.h is
- Copyright (c) 2009 by Takashi YOSHII. All rights reserved.
See doc/LICENSING.txt for the details.