Programming libraries for audio, graphics and media development

Programming libraries for audio, graphics and media development

Here are listed some libraries and APIs, that may be helpful when developing audio, video and media applications.

Note: This Page should include only libraries (APIs) that are cross-platform and have an OSI or FSF (FSFE) accepted open-source license.

Page	Description	Tags
ags	Advanced Gtk+ Sequencer Advanced Gtk+ Sequencer is an audio sequencer written in C using GObject and Gtk+. It features a piano roll, as well a synth, matrix ed…	Synthesis/Composition Tools, LADSPA Host, Sequencers, Soft Synths/Samplers, DSSI, LV2 Host, JACK, Development, MIDI Software, JACK MIDI, ALSA sequencer, PulseAudio
AIFF DSP	AIFF DSP A framework in which your C functions which process the data in Audio IFF (AIFF) files are called. The framework contains main() and deals with all a…	Development
Allegro	Allegro C game programming library (also usable from C++) with sound support. game_things jack development	Game Things, JACK, Development
ALPY	ALPY ALPY is a 3D sound kit, based op OpenAL, with a Python binding. It is (c) by Bram Stolk, and available under GPL license. Initially, this started out as …	Development, Unmaintained projects, Game Things
ALSA	ALSA The Advanced Linux Sound Architecture (ALSA) provides audio and MIDI functionality to the Linux operating system. ALSA provides fully open-sourced driver…	Primary Resources, Sound Cards & Drivers, Development
ALSA MIDI Kommander	ALSA MIDI Kommander DCOP interface exposing many ALSA sequencer features for shell scripts, Kommander scripts, or KDE programs requiring MIDI sequencer service…	ALSA sequencer, MIDI Software, Development, Unmaintained projects
ALSA Programming HOWTO	ALSA Programming HOWTO A guide for the perplexed howtos_and_faqs development and_now_for_something_rather_different midi_software	HOWTOs and FAQs, Development, Not software, MIDI Software
aubio	aubio Library designed for the extraction of annotations from audio signals. Its features include segmenting a sound file before each of its attacks, performin…	Development
Audio::LADSPA	Audio::LADSPA Perl extensions for hosting LADSPA plugins ladspa development	LADSPA Host, Development
BruteFIR	BruteFIR Command-line app to apply long FIR filters to multi-channel digital audio, offline or in realtime. filters convolution development dsp	Filters, Convolution, Development, dsp
ccAudio	ccAudio a portable general purpose C++ class library for manipulating audio files and audio data development	Development
ccAudio2	ccAudio2 an improved version of the former ccAudio, from the Bayonne GNU/Linux telephony project development	Development
ClanLib	ClanLib a platform-independent game SDK with sound support game_things development	Game Things, Development
Demolition	Demolition ladspa development	LADSPA Host, Development
dirac	dirac C/C++ object library that redefines the limits of what todays’ technology can do for your app if you want to change the speed and pitch of music independ…	Development, dsp
DRC	DRC Generates digital room correction FIR filters to be used within HiFi systems in conjunction with real-time convolution engines like BruteFIR. filters deve…	Filters, Development, dsp
Driving One's Own Audio Device	Driving One's Own Audio Device Write a custom (not ALSA) kernel driver. and_now_for_something_rather_different development howtos_and_faqs	Not software, Development, HOWTOs and FAQs
drumstick	drumstick Drumstick is a set of MIDI libraries using C++/Qt idioms and style. Includes a wrapper around the ALSA library sequencer interface: ALSA sequencer pr…	ALSA sequencer, Development, MIDI Software
DSSI	DSSI * <http://dssi.sourceforge.net> The Disposable SoftSynth Interface, a “LADSPA for instruments” API from Chris Cannam, Sean Bolton, and Steve Harris. …	Development, Audio Plugin Systems
FAUST	faust * (faust.grame.fr) - homepage * online internet version * more screenshots * faust2pd - connect to puredata (pd) Faust is a functional…	LADSPA Host, JACK, Synthesis/Composition Tools, Development, dsp
Faust Online	Faust Online This interactive Web site offers the possibility to write your own audio applications or plugins using the Faust compiler online. The website con…	JACK, Synthesis/Composition Tools, Development, dsp
Festival	Festival speech synthesis system Related: development speech_software	Development, Speech software
FFTW	FFTW C subroutine library for the “Fastest Fourier Transform in the West” development dsp	Development, dsp
Fiview	Fiview Graphically design/view a filter. Generates public domain source code that can be used directly in an app filters development dsp	Filters, Development, dsp
FLAC	FLAC the Free Lossless Audio Codec, an audio format similar to MP3, but lossless, meaning that audio is compressed in FLAC without any loss in quality. deve…	Development, Audio File Compression
FlowDesigner	FlowDesigner * <http://flowdesigner.sourceforge.net/> interesting visual environment for building audio and signal processing applications development ds…	Development, dsp
FMOD	FMOD * <http://www.fmod.org/> music and effects system, supports large variety of playback types development	Development
GNU 3DKit	GNU 3DKit unmaintained development	Unmaintained projects, Development
GSI	GSI the General Sound Interface, an API with stereo sample play, 3D, Doppler fx, etc. development unmaintained	Development, Unmaintained projects
GStreamer	GStreamer network_audio development	Network Audio, Development
GStreamer Pipeline Editor	GStreamer Pipeline Editor requires GStreamer network_audio development	Network Audio, Development
Guide to linux sound APIs	Guide to linux sound APIs it is very difficult for programmers to figure out which audio API to use for which purpose and which API not to use when doing audio…	Development, HOWTOs and FAQs
GWC-lib	GWC-lib the GNOME Wave Cleaner is now a library ! development dsp	Development, dsp
HawkVoice	HawkVoice game-oriented, multiplayer voice-over-network API... designed to be a portable, free, open source code alternative to Microsoft's DirectPlay Voice in…	Game Things, Development, Unmaintained projects
Helix DNA Producer	Helix DNA Producer network_audio development	Network Audio, Development
Improv	Improv C++ environment for writing programs that enable musician/computer interaction using MIDI instruments midi_software unmaintained development	MIDI Software, Unmaintained projects, Development
Introduction to OSS MIDI programming	Introduction to OSS MIDI programming Only for the old OSS API (not ALSA). development and_now_for_something_rather_different howtos_and_faqs midi_software u…	Development, Not software, HOWTOs and FAQs, MIDI Software, Unmaintained projects
JACK	JACK For the cd-ripper named jack go here: jack The Jack Audio Connection Kit (JACK) is Paul Davis's professional-quality low-latency audio server and transpo…	JACK, Development
Jack4j	jack4j development java	Development, JAVA software
jein	jein a Java version of Ein, DSP learning software from Paul Lansky and Ken Steiglitz dsp java development	dsp, JAVA software, Development
Jezabel	Jezabel development ladspa	Development, LADSPA Host
JJack	JJack jack development	JACK, Development
jMusic	jMusic is a Java class of functions for generating and manipulating MIDI musical data midi_software dead_link development	MIDI Software, Dead external links, Development
Juce	Juce Cross-platform GUI + everything else library development	Development
JVOIPLIB	JVOIPLIB telephony_and_a_v_conferencing unmaintained development	Telephony & A/V Conferencing, Unmaintained projects, Development
Khagan	Khagan interface builder for OSC-based applications development osc unmaintained	Development, Open Sound Control (OSC), Unmaintained projects
Kiss FFT	Kiss FFT Very small FFT library, can use either fixed or floating point data types development dsp	Development, dsp
LADSPA	LADSPA The central site for information regarding the Linux Audio Developers Simple Plugin API, maintained by Richard W. E. Furse. Applications using LAD…	Audio Plugin Systems, Development
ladspapluginmaker	ladspapluginmaker GUI for creating LADSPA-compatible audio plug-ins, from the makers of GDAM development ladspa	Development, LADSPA Host
ladspar	ladspar Ruby module for using LADSPA plugins development ladspa	Development, LADSPA Host
LAME	LAME source code for an encoder licensed under the GPL mpeg_players_and_encoders development	MPEG Player/Encoder, Development
libaio	libaio a platform abstraction layer for digital audio I/O development	Development
libakai	libakai development	Development
LibDSP	LibDSP library of common DSP functions development dsp	Development, dsp
libfilth	libfilth digital-analog filter design library. development filters dsp	Development, Filters, dsp
libfishsound	libfishsound development	Development
libgaudio	libgaudio game_things development unmaintained	Game Things, Development, Unmaintained projects
libgdither	libgdither Library for performing audio dithering on PCM samples development	Development
libgig	libgig development	Development
liblo	liblo An easy to use OSC (Open Sound Control) implementation written in C. osc development	Open Sound Control (OSC), Development
liblrdf	liblrdf Library for handling RDF descriptions of LADSPA (and potentially other format) plugins development ladspa	Development, LADSPA Host
LibModSynth: Audio plugin design tools for Linux	LibModSynth: Audio plugin design tools for Linux LibModSynth is a library of high quality audio DSP modules built with sound quality, CPU efficiency and intero…	DSSI, Effects Processors, Development
liboggz	liboggz development	Development
libsamplerate	libsamplerate Library for sample-rate conversion development dsp	Development, dsp
libsmf	libsmf Easy to use C library to read and write SMF (“*.mid”) files. Automatically handles timing, pulses<->seconds computation, tempo management, tempo map ha…	MIDI Software, Development
libsndfile	libsndfile library for reading and writing many different soundfile formats. development	Development
libtimidity	libtimidity MIDI to WAVE converter library that uses Gravis Ultrasound-compatible patch files to generate digital audio data from General MIDI files. This lib…	Development, MIDI Software, Soft Synths/Samplers
Linux Sound Hacker's Guide	Linux Sound Hacker's Guide for programming the OSS/Free driver from Hannu Savolainen development	Development
LV2	LV2 LV2 is a standard for plugins and matching host applications, mainly targeted at audio processing and generation. LV2 is a simple but extensible successor…	Development, Audio Plugin Systems
Maaate	Maaate mpeg_players_and_encoders dsp development	MPEG Player/Encoder, dsp, Development
MFFM 3D Audio Library	MFFM 3D Audio Library a library for driving 3D speaker arrays speaker_design development	Speaker Design, Development
MFFM Bit Stream	MFFM Bit Stream development	Development
MFFM Multimedia Time Code	MFFM Multimedia Time Code C++ headers for managing time code development	Development
MIDI Modules	MIDI Modules * <ftp://ftp.cwi.nl/pub/jack/python/> for the Python programming language midi_software dead_link development	MIDI Software, Dead external links, Development
MIDI-Perl	MIDI-Perl “...a suite of Perl modules that allows you to read, compose, modify, and write MIDI files” midi_software development dead_link	MIDI Software, Development, Dead external links
MidiIO	MidiIO Cross-platform MIDI software interface for C++ programming. midi_software development	MIDI Software, Development
MidiShare	MidiShare * <http://midishare.sourceforge.net/> * <http://www.grame.fr/Research/> is a “... real-time operating system for musical applications” from the …	MIDI Software, Development
Midithing	Midithing MIDI library in Python for an eventual sequencer from Tim Goetze midi_software unmaintained development	MIDI Software, Unmaintained projects, Development
MMidi	MMidi describes tools for MIDI over the MBONE multicast network midi_software on-line_articles development	MIDI Software, On-line articles, Development
MPEG-4 Structured Audio: Developer Tools	MPEG-4 Structured Audio: Developer Tools a page from John Lazzaro and John Wawrzynek, includes the indispensable sfront general_synthesis_packages synthesis…	General Synthesis Packages, Synthesis/Composition Tools, Development
Music-DSP Source Code Archive	Music-DSP Source Code Archive code for synthesis, filters, analysis, effects, and other DSP functions development dsp	Development, dsp
MusicXML	MusicXML “... a universal translator for common Western musical notation... designed as an interchange format for notation, analysis, retrieval, and performanc…	Music Notation Editors, Development
Nord Modular G2 Patch Format	Nord Modular G2 Patch Format informative page from Michael Dewberry development midi_software	Development, MIDI Software
nwfiir audio tools	nwfiir audio tools filters development dsp	Filters, Development, dsp
ObjectProDSP	ObjectProDSP an X11 GUI for DSP design and implementation unmaintained dsp development	Unmaintained projects, dsp, Development
Oggz	Oggz API for reading and writing OGG files and streams tools_to_make_tools development dead_link	tools to make tools, Development, Dead external links
OpenAL	OpenAL * <http://www.openal.org/> open-source audio library for games and multimedia applications, sponsored by Creative Labs and Loki Entertainment game…	Game Things, Development, Unmaintained projects
OSS/Free	OSS/Free * Information about the new and improved OSSv4 and its benefits over alsa for unix audio * Information about the pre-2.5 Linux kernel sound driv…	Primary Resources, Sound Cards & Drivers, Development
PHAT	PHAT “a collection of GTK+ widgets geared toward pro-audio apps”, from Pete Bessman and friends development	Development
PLib	PLib a suite of game libraries with OpenGL and C++ interfaces, from Steve Baker development game_things	Development, Game Things
Poles and Zeros	Poles and Zeros filters development dsp	Filters, Development, dsp
Polyphone	Polyphone Polyphone is an excellent tool for creating, editing, and combining SoundFonts in the SF2 format. Linux, Mac, and Windows. development linux_based_…	Development, Linux Based Products, Patch Editor, Samples, Loops, and MIDI Files, Soft Synths/Samplers, Synthesis/Composition Tools, Soundfonts and Related
PortAudio	portaudio development	Development
portmidi	portmidi development midi_software	Development, MIDI Software
Programmer's Guide To OSS	Programmer's Guide To OSS sound & MIDI device programming, from 4Front howtos_and_faqs development	HOWTOs and FAQs, Development
Ptolemy	Ptolemy homepage for the Ptolemy Project of the DSP Design Group at UCB and_now_for_something_rather_different development dsp	Not software, Development, dsp
PulseAudio	PulseAudio sound_server development pulseaudio	sound server, Development, PulseAudio
PVC	PVC an extensive set of phase vocoder tools and utilities from Paul Koonce, with a Linux version from John Gibson development dsp	Development, dsp
pyalsa	pyalsa MIDI wrappers for Python, from Phil Frost midi_software unmaintained development	MIDI Software, Unmaintained projects, Development
pyliblo	pyliblo pyliblo is a Python wrapper for the liblo OSC library. It supports almost the complete functionality of liblo, allowing you to send and receive OSC mes…	Open Sound Control (OSC), Development
pyo	pyo midi_software osc development dsp	MIDI Software, Open Sound Control (OSC), Development, dsp
Q-Audio/Q-MIDI	Q-Audio/Q-MIDI useful extensions to the Q programming language unmaintained development	Unmaintained projects, Development
Q-Midi	Q-Midi a MidiShare interface for the Q programming language midi_software unmaintained development	MIDI Software, Unmaintained projects, Development
rtmidi	rtmidi development	Development
RTP MIDI	RTP MIDI A protocol for transmitting MIDI via an Ethernet connection. midi_software on-line_articles development	MIDI Software, On-line articles, Development
rubberband	rubberband Library for high-quality time-stretching and pitch-shifting. pitch_effect development effects_processors	Pitch effect, Development, Effects Processors
Ruby/Audio	Ruby/Audio Hans Fugal's “library that makes dealing with audio data a little easier...in Ruby” development	Development
Scilab	Scilab development dsp	Development, dsp
SDL	SDL Simple Directmedia Layer library development project game_things development	Game Things, Development
SDL Mixer	SDL Mixer development	Development
SDL_sound	SDL_sound a library to handle decoding of soundfile formats such as WAV and MP3 development	Development
sfront	sfront a translator that converts MP4-SA files into efficient C programs that generate audio for rendering, interactive and network applications general_syn…	General Synthesis Packages, Synthesis/Composition Tools, Development
Sig++	Sig++ music signal processing in C++ development dsp	Development, dsp
Signalgo	Signalgo DSP library for Java development java dsp	Development, JAVA software, dsp
SL Sound Library	SL Sound Library library for playing, mixing, and modifying sound samples in realtime, designed especially for games and simulations game_things development…	Game Things, Development, Unmaintained projects
sndlib	sndlib library for the Snd soundfile editor snd development	Snd, Development
SndObj/pySndObj	SndObj/pySndObj “a set of object-oriented cross-platform audio development tools and sample programs...for the quick design of sound processing applications” …	Development
Sonic Flow	Sonic Flow designs/simulates audio signal processing networks development dsp	Development, dsp
sonivox	sonivox This project is a fork of the Android Open Source Project 'platform_external_sonivox', including a CMake based build system to be used not on Android, …	new, Development, Synthesis/Composition Tools, General Synthesis Packages
Sound Processing Kit	Sound Processing Kit C++ class library for audio signal processing development dsp	Development, dsp
SoundTouch	SoundTouch Library for high-quality time-stretching and pitch-shifting. pitch_effect development effects_processors	Pitch effect, Development, Effects Processors
The MusicKit	The MusicKit object-oriented software system for building music, sound, signal processing, and MIDI apps general_synthesis_packages synthesis_and_compositi…	General Synthesis Packages, Synthesis/Composition Tools, Development, MIDI Software
The PLUM Page	The PLUM Page synthesis_and_composition_packages and_now_for_something_rather_different development	Synthesis/Composition Tools, Not software, Development
tranzport	tranzport Docs/code for programming Frontier Design's Tranzport wireless USB device hardware_linux development and_now_for_something_rather_different	Hardware + Linux, Development, Not software
Tritonus	Tritonus an implementation of the JavaSound API, from Matthias Pfisterer, Florian Bomers, and others development java	Development, JAVA software
TSE3 Library	TSE3 Library open-source MIDI sequencer engine in C++ midi_software development	MIDI Software, Development
UNIX MIDI libraries	UNIX MIDI libraries general purpose MIDI system for Unix, useful code from John Stone and Friends. midi_software development	MIDI Software, Development
Virtual Sound	Virtual Sound audio synthesis tools general_synthesis_packages synthesis_and_composition_packages development	General Synthesis Packages, Synthesis/Composition Tools, Development
Vorbis Development	Vorbis Development the place for Vorbis developers dead_link development	Dead external links, Development
Writing Audio Applications With JACK - A Tutorial/Journal	Writing Audio Applications With JACK - A Tutorial/Journal excellent instruction from James Shuttleworth howtos_and_faqs jack development	HOWTOs and FAQs, JACK, Development
Zerius Vocoder	Zerius Vocoder C and Java source code for software channel vocoder. dsp development	dsp, Development

libraries for audio and midi output

Jack audio API - http://jackaudio.org/ - cross platform audio/midi IO

Portmedia - http://portmedia.sourceforge.net/ with its sub-projects - port audio and port midi

Pulseaudio - http://pulseaudio.org/ .

OpenML - http://www.khronos.org/openml/

RtMidi - http://www.music.mcgill.ca/~gary/rtmidi/ - Cpp library for midi IO

WebAudio - http://www.w3.org/TR/webaudio/ - W3C WebAudio API 2012

libraries for audio processing and signal processing (DSP)

UGen++ audio processing API synthesis framework in C. It provides oscillators, filters, envelopes and event management etc. * [[http://code.google.com/p/pyo/ Python digital signal processing module ]] written in C to help digital signal processing script creation. * Jamoma DSP - interface for C, with an emphasis on real-time signal processing

* gtkIOStream jackd client - trivialises using jackd for audio input and output DSP processing.

Articles

real-time audio programming 101

Libraries for Atomic Operations

'Atomic Operations' are not allowed to be interrupted (e.g. by other threads).

Atomics in glib
OpenPA - Portable Atomics
gcc - Atomic Builtins
HP atomic_ops project
Boost Atomic (C++ or C++11 or C++0x)
Boost Atomic.hpp (c++)
Intel® Threading Building Blocks (Intel TBB)
Userspace RCU library - User-level Read-Copy Update, Lock-free data structures (RCU lock-free hash table with auto-resize, queues, stacks), atomic operations, efficient user-level wait/wake-up
libsync - Atomic operations and userspace RCU
PJLIB - A small footprint framework library written in C for making scalable applications. Includes Atomic Ops.
gtkIOStream thread and gtkIOStream mutex - Set of mutex and thread Cheaders to trivialise threading. Can use either pthreads or GLib threads. \\ \\ ===== Lockfree (non-blocking) Data Structures - Libraries ===== \\ * [[http://lttng.org/urcu
Userspace RCU (read-copy-update) ]] * What is RCU - Article * FastFlow - Lockfree FIFO Queues * Atomic Ptr Plus * nbds - non-blocking data structures * libLFDS * lock-free library of the University Cambridge * Rig library - lock-free data structures, safe strings and misc others C library * ARP - Apache Portable Runtime * RefCount library - lock-free word-based atomic reference counting * Sunrise Data Dictionary for C - Library for lock-free hash table storage of arbitrary data * Boost.Lockfree - A boost-like, but NOT boost, library for lockfree structs. * Noble library - a library of non-blocking synchronization protocols * Userspace RCU library liburcu-cds - Userspace RCU Lock-free data structures (RCU lock-free hash table with auto-resize, queues, stacks) * varchunk - rt-safe, lock-free, zero-copy, contiguous-chunk ringbuffer optimized for event handling.
===== Parallel Programming =====
* Par4all compiler - Generates OpenCL, CUDA or OpenMP parallel code from (sequenciel) C code.
* OpenMP (Open Multi-Processing) - OpenMP is an API (Application Programming Interface) that supports multi-platform shared memory multiprocessing programming. * Gomp - GNU implementation of the OpenMP spec. * (WP) OpenMP
* Open-MPI (message passing interface) - MPI addresses primarily a message-passing parallel programming model. * MPI 2.2 specification * MPICH2 - open MPI implementation * mpi 4 py - MPI for Python - mpi 4 py Documentation * (WP) MPI - Message Passing Interface * MPI FAQ
* MPI-RT 1.1 spec. - real-time message-passing-interface v1.1 (an implementation doesn't exist !?)
* OpenCL - Standard for cross-platform, parallel programming of modern processors. * OpenCL develop-kit Linux - OpenCL defines an extended C language for writing compute kernels and a set of APIs for creating and managing these kernels. * OpenCL API * OpenCL Tutorial * PyOpenCL - use OpenCL parallel computation API from Python * PyFFT - fast fourier transform with OpenCL (or Cuda) using Python

* Unified Parallel C - UPC is an extension of the C programming language designed for high-performance computing. * GCC-UPC - GNU implementation of the UPC language spec.
* CSP For Posix Threads - “«Communicating Sequential Processes» is an algebra for analysing the behaviour of concurrent systems … a library … that makes programming with threads much easier.”

* Parallel Computing Manual * Parallel Programming - Basic Theory

see also: * The concurrency kit - An online Manual * (WP) IPC Methods (Inter-Process Communication) * http://www.cs.kent.ac.uk/projects/ofa/c%2B%2Bcsp/ - CppCSP (Communicating Sequential Processes) - Easy Concurrency for Cpp * (WP) concurrent programming languages 1 * (WP) Concurrent programming languages 2 * (WP) CSP - Communicating sequential processes * | RTLinux IPC * Posix Threads * IPC Mechanisms (Inter-Process-Communication)
===== Session handling =====
Restore application-state and audio/midi connections.
There are at least three different APIs for session handling in linux. They allow to save and restore the state of different applications, including midi and audio connections !
* JackSession - is kind of basic, requires applications to be restarted * Ladish - is advanced, has a concept of storing session-“rooms” * NSM - has most of the really useful functions (based on OSC) - does not require apps to be restarted
For more information, visit the projects websites: * NSM - The NON Session-Manager - comes as part of NON-DAW - API Link and screenshot * JackAudio Session Handler * ladish - Linux Audio Dev. Session Handler

===== Thread management and CPU-affinity in linux ===== * there is a tool called schedtool, which allows to “set all CPU scheduling parameters Linux is capable of or display information for given processes.” * also to mention: nice and renice tools (part of the “bsdutils” package) * and linux API functions: sched_setscheduler(), sched_setaffinity()
Related MAN-Pages: * schedtool (formerly: schedutils) * perf-sched - Trace or measure scheduler properties (latencies) (perf in package “linux-tools-common”) * sched_setaffinity * sched_setscheduler * nice - note: don't confuse nice priorities with real-time-priorities (in package “bsdutils”) * chrt (part of "util-linux" package - a tool to maniplate real-time attributes (priorities)
Related Articles: * example * Take charge of processor affinity * The Linux-Kernel API (2.6.20) * real-time kernel wiki - more tools and information * About Linux Processes * task_struct * CPU Affinity - LinuxJournal * sched.h - header file * GNU C - CPU Priority And Scheduling * Linux Driver HowTO (german!) * Setting processor affinity * list running processes * kernel hacking
* hwloc - portable multi threading
Part of an Answer at stackoverflow.com :
```
sched_setaffinity() simply tells the scheduler which 
CPUs is that process/thread allowed to run on, then calls 
for a re-schedule.

The scheduler actually runs on each one of the CPUs, so it 
gets a chance to decide what task to execute next on 
that particular CPU.

If you're interested in how you can actually call some code 
on other CPUs, I suggest you take a look at 
smp_call_function_single(). In case we want to call something 
on another CPU, this calls generic_exec_single(). 
The latter simply adds the function to the target CPU's 
call queue and forces a reschedule through some 
IPI stuff (if the queue was empty).

Bottom line is: there no actual SMP variant of 
the _jmp_ instruction. Instead, code running on other CPUs 
cooperates in order to accomplish the task.
```
===== GUI libraries - create graphical user interfaces ===== Comment: additional info would be nice, for example: does it support skins/themes, download size, is it for graphics only or a whole framework… ==== 2-dimensional ==== Juce (framework) - Juce and Juced Sfml - http://www.sfml-dev.org/features.php . Lgi - http://www.memecode.com/lgi.php OpenFrameworks (framework) - http://www.openframeworks.cc/about . Fox toolkit - http://www.fox-toolkit.org/ . Qt (framework) - http://qt.nokia.com/products . Gtk - http://www.gtk.org/ . Fltk - http://www.fltk.org/ . WxWidgets - http://www.wxwidgets.org/ . Ultimate++ - http://ultimatepp.org/www$uppweb$overview$en-us.html - Cpp cross-platform Framework . gtkIOStream - http://sourceforge.net/projects/gtkiostream/ - Inline headers for C iostream style GTK GUI building .