Asynchronous I/O - revision history

Dank at 02:54, 21 October 2009

2009-10-21T02:54:50Z

← Older revision		Revision as of 02:54, 21 October 2009
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	==BSD==		==BSD==
	The <tt>F_SETOWN</tt> and <tt>F_GETOWN</tt> suboperations of the <tt>fcntl(2)</tt> system call provided asynchronous I/O notifications via SIGIO and SIGURG. It only operated on pipes and terminals (and required <tt>O_ASYNC</tt> to be set via <tt>open(2)</tt> or <tt>fcntl(F_SETFL)</tt>), and has been obsoleted by POSIX 1003.1b. Linux supports the old BSD scheme and extends it via <tt>F_SETSIG</tt> and <tt>F_GETSIG</tt>.		The <tt>F_SETOWN</tt> and <tt>F_GETOWN</tt> suboperations of the <tt>fcntl(2)</tt> system call provided asynchronous I/O notifications via SIGIO and SIGURG. It only operated on pipes and terminals (and required <tt>O_ASYNC</tt> to be set via <tt>open(2)</tt> or <tt>fcntl(F_SETFL)</tt>), and has been obsoleted by POSIX 1003.1b. [[Linux APIs\|Linux]] supports the old BSD scheme and extends it via <tt>F_SETSIG</tt> and <tt>F_GETSIG</tt>.

	==POSIX==		==POSIX==

Dank at 02:54, 21 October 2009

2009-10-21T02:54:36Z

← Older revision		Revision as of 02:54, 21 October 2009
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	~~Defined in~~ [http://opengroup.org/onlinepubs/009695399/basedefs/aio.h.html POSIX 1003.1b] (2004), and ~~largely unchanged since then~~ (~~though see Ulrich Drepper's [http://people.redhat.com/drepper/newni~~-~~slides.pdf 2006 proposal]~~)~~, asynchronous I/O provides perhaps the most easily parallelized I/O model [[Fast UNIX Servers\|on UNIX]]~~.		Asynchronous I/O indicates operation completion not via function return, but a notification queued from device management (on UNIX, this usually means a signal queued from the relevant device driver). It provides perhaps the most easily parallelized I/O model [[Fast UNIX Servers\|on UNIX]], especially following the [[Asynchronous I/O#POSIX\|POSIX 1003.1b]] standardization effort.

			==BSD==
			The <tt>F_SETOWN</tt> and <tt>F_GETOWN</tt> suboperations of the <tt>fcntl(2)</tt> system call provided asynchronous I/O notifications via SIGIO and SIGURG. It only operated on pipes and terminals (and required <tt>O_ASYNC</tt> to be set via <tt>open(2)</tt> or <tt>fcntl(F_SETFL)</tt>), and has been obsoleted by POSIX 1003.1b. Linux supports the old BSD scheme and extends it via <tt>F_SETSIG</tt> and <tt>F_GETSIG</tt>.

			==POSIX==
			[http://opengroup.org/onlinepubs/009695399/basedefs/aio.h.html POSIX 1003.1b] (2004) introduced an asynchronous I/O API suitable for realtime applications, obsoleting and superseding the BSD and SystemV (STREAMS-based) implementations.

	==See Also==		==See Also==
	* "[http://lse.sourceforge.net/io/aio.html Kernel Asynchronous I/O (AIO) Support for Linux]"		* "[http://lse.sourceforge.net/io/aio.html Kernel Asynchronous I/O (AIO) Support for Linux]"
	* [[Glibc]] asynchronous I/O [http://www.gnu.org/software/libc/manual/html_node/Asynchronous-I_002fO.html documentation]		* [[Glibc]] asynchronous I/O [http://www.gnu.org/software/libc/manual/html_node/Asynchronous-I_002fO.html documentation]

Dank at 02:26, 21 October 2009

2009-10-21T02:26:35Z

← Older revision		Revision as of 02:26, 21 October 2009
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	Defined in [http://opengroup.org/onlinepubs/009695399/basedefs/aio.h.html POSIX 1003.1] (2004), and largely unchanged since then (though see Ulrich Drepper's [http://people.redhat.com/drepper/newni-slides.pdf 2006 proposal]), asynchronous I/O provides perhaps the most easily parallelized I/O model [[Fast UNIX Servers\|on UNIX]].		Defined in [http://opengroup.org/onlinepubs/009695399/basedefs/aio.h.html POSIX 1003.1b] (2004), and largely unchanged since then (though see Ulrich Drepper's [http://people.redhat.com/drepper/newni-slides.pdf 2006 proposal]), asynchronous I/O provides perhaps the most easily parallelized I/O model [[Fast UNIX Servers\|on UNIX]].

	==See Also==		==See Also==
	* "[http://lse.sourceforge.net/io/aio.html Kernel Asynchronous I/O (AIO) Support for Linux]"		* "[http://lse.sourceforge.net/io/aio.html Kernel Asynchronous I/O (AIO) Support for Linux]"
			* [[Glibc]] asynchronous I/O [http://www.gnu.org/software/libc/manual/html_node/Asynchronous-I_002fO.html documentation]

Dank at 01:04, 21 October 2009

2009-10-21T01:04:41Z

← Older revision		Revision as of 01:04, 21 October 2009
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			Defined in [http://opengroup.org/onlinepubs/009695399/basedefs/aio.h.html POSIX 1003.1] (2004), and largely unchanged since then (though see Ulrich Drepper's [http://people.redhat.com/drepper/newni-slides.pdf 2006 proposal]), asynchronous I/O provides perhaps the most easily parallelized I/O model [[Fast UNIX Servers\|on UNIX]].

	==See Also==		==See Also==
	* "[http://lse.sourceforge.net/io/aio.html Kernel Asynchronous I/O (AIO) Support for Linux]"		* "[http://lse.sourceforge.net/io/aio.html Kernel Asynchronous I/O (AIO) Support for Linux]"

Dank: Created page with '==See Also== * "[http://lse.sourceforge.net/io/aio.html Kernel Asynchronous I/O (AIO) Support for Linux]"'

2009-10-21T00:50:24Z

Created page with '==See Also== * "[http://lse.sourceforge.net/io/aio.html Kernel Asynchronous I/O (AIO) Support for Linux]"'

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==See Also==
* "[http://lse.sourceforge.net/io/aio.html Kernel Asynchronous I/O (AIO) Support for Linux]"