64 lines
2.1 KiB
Markdown
64 lines
2.1 KiB
Markdown
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# The atomic_ops library (libatomic_ops)
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This is version 7.4.2 of libatomic_ops.
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You might find a more recent version
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[here](http://www.hboehm.info/gc/), or
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[here](https://github.com/ivmai/libatomic_ops).
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## Overview
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This package provides semi-portable access to hardware-provided
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atomic memory update operations on a number architectures. These might
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allow you to write code:
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* That does more interesting things in signal handlers.
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* Makes more effective use of multiprocessors by allowing you to write
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clever lock-free code. Note that such code is very difficult to get
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right, and will unavoidably be less portable than lock-based code. It
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is also not always faster than lock-based code. But it may occasionally
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be a large performance win.
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* To experiment with new and much better thread programming paradigms, etc.
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For details and licensing restrictions see the files in the "doc"
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subdirectory.
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Please address bug reports to [mailing list](mailto:bdwgc@lists.opendylan.org).
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## Installation and Usage
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The configuration and build scripts for this package were generated by
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Automake/Autoconf. "./configure; make; sudo make install" in this
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directory should work. For a more customized build, see the output of
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"./configure --help".
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Note that much of the content of this library is in the header files.
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However, two small libraries are built and installed:
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* libatomic_ops.a is a support library, which is not needed on some platforms.
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This is intended to be usable, under some mild restrictions, in free or
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proprietary code, as are all the header files. See doc/LICENSING.txt.
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* libatomic_ops_gpl.a contains some higher level facilities. This code is
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currently covered by the GPL. The contents currently correspond to
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the headers atomic_ops_stack.h and atomic_ops_malloc.h.
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## Platform Specific Notes
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Win32/64: src/Makefile.msft contains a very simple Makefile for building
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and running tests and building the gpl library. The core atomic_ops
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implementation is entirely in header files.
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HP-UX/PA-RISC: aCC -Ae won't work as a C compiler, since it doesn't support
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inline assembly code. Use cc.
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## Copyright & Warranty
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See doc/LICENSING.txt file.
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