[[threads]]
 
Trace: » numark_total_control » beginner_s_guide » gsoc_2008_ideas » supported_controller_test_grid » mixman_dm2 » testing_framework » performance_improvements » creating_backtraces » behringer_bcd3000 » threads

Threads in Mixxx

Mixxx is a highly multithreaded program for performance reasons. This page contains a list of the threads Mixxx runs, as of 1.6.2:

  • GUI thread
  • MIDI thread - Receives MIDI events from hardware and sends through MIDI mapping system onto Mixxx's controls or to script functions.
  • MidiScriptEngine thread - executes any MIDI scripting functions
  • Audio thread (runs from PortAudio callback) - Does all audio processing that eventually hits your soundcard/ears. :)
  • Analyser thread - Performs BPM detection, wave summary generation (the mini waveforms)
  • 2 x Reader threads - Decode MP3s, OGGs, etc. asynchronously. Feeds decoded audio into EngineBuffer ringbuffer.
  • 2 x VinylControl threads - Process timecode signals
  • Sidechain thread - Does non-realtime processing of audio. Used for recording to disk and shoutcast broadcasting.

Note that a list of threads can be seen when you generate a backtrace with GDB, like this one: 

#
(gdb) thread apply all bt
#
 
#
Thread 14 (Thread 0xa3b25b90 (LWP 7427)):
#
#0  0xb7f65430 in __kernel_vsyscall ()
#
#1  0xb686dae7 in poll () from /lib/tls/i686/cmov/libc.so.6
#
#2  0xb7cd66d6 in ?? () from /usr/lib/libportaudio.so.2
#
#3  0xb7cd7f57 in ?? () from /usr/lib/libportaudio.so.2
#
#4  0xb7cb74ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#
#5  0xb687849e in clone () from /lib/tls/i686/cmov/libc.so.6
#
 
#
Thread 13 (Thread 0xa43d4b90 (LWP 7409)):
#
#0  0xb7f65430 in __kernel_vsyscall ()
#
#1  0xb686dae7 in poll () from /lib/tls/i686/cmov/libc.so.6
#
#2  0x081cf632 in MidiObjectALSASeq::run (this=0x9ba7c00)
#
    at src/midiobjectalsaseq.cpp:271
#
#3  0xb6d9593e in ?? () from /usr/share/qt4/lib/libQtCore.so.4
#
#4  0xb7cb74ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#
#5  0xb687849e in clone () from /lib/tls/i686/cmov/libc.so.6
#
 
#
Thread 12 (Thread 0xafd12b90 (LWP 7408)):
#
#0  0xb7f65430 in __kernel_vsyscall ()
#
#1  0xb686dae7 in poll () from /lib/tls/i686/cmov/libc.so.6
#
#2  0xb63276fb in IA__g_poll (fds=0x9ac9658, nfds=1, timeout=-1)
#
    at /build/buildd/glib2.0-2.19.8/glib/gpoll.c:127
#
---Type <return> to continue, or q <return> to quit---
#
#3  0xb6319ef2 in g_main_context_iterate (context=0x9c332f0, block=1,
#
    dispatch=1, self=0xa004da0)
#
    at /build/buildd/glib2.0-2.19.8/glib/gmain.c:2761
#
#4  0xb631a1d8 in IA__g_main_context_iteration (context=0x9c332f0, may_block=1)
#
    at /build/buildd/glib2.0-2.19.8/glib/gmain.c:2511
#
#5  0xb6eb53a8 in QEventDispatcherGlib::processEvents ()
#
   from /usr/share/qt4/lib/libQtCore.so.4
#
#6  0xb6e87ffa in QEventLoop::processEvents ()
#
   from /usr/share/qt4/lib/libQtCore.so.4
#
#7  0xb6e8843a in QEventLoop::exec () from /usr/share/qt4/lib/libQtCore.so.4
#
#8  0xb6d92609 in QThread::exec () from /usr/share/qt4/lib/libQtCore.so.4
#
#9  0x08220e5b in MidiScriptEngine::run (this=0x9ba7de0)
#
    at src/script/midiscriptengine.cpp:96
#
#10 0xb6d9593e in ?? () from /usr/share/qt4/lib/libQtCore.so.4
#
#11 0xb7cb74ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#
#12 0xb687849e in clone () from /lib/tls/i686/cmov/libc.so.6
#
 
#
Thread 10 (Thread 0xb0513b90 (LWP 7391)):
#
#0  0xb7f65430 in __kernel_vsyscall ()
#
#1  0xb7cbb0e5 in pthread_cond_wait@@GLIBC_2.3.2 ()
#
   from /lib/tls/i686/cmov/libpthread.so.0
#
#2  0xb6d96982 in QWaitCondition::wait ()
#
   from /usr/share/qt4/lib/libQtCore.so.4
#
---Type <return> to continue, or q <return> to quit---
#
#3  0x080f87ba in AnalyserQueue::dequeueNextBlocking (this=0x9900bd8)
#
    at src/analyserqueue.cpp:32
#
#4  0x080f9376 in AnalyserQueue::run (this=0x9900bd8)
#
    at src/analyserqueue.cpp:97
#
#5  0xb6d9593e in ?? () from /usr/share/qt4/lib/libQtCore.so.4
#
#6  0xb7cb74ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#
#7  0xb687849e in clone () from /lib/tls/i686/cmov/libc.so.6
#
 
#
Thread 4 (Thread 0xb2cc5b90 (LWP 7104)):
#
#0  0xb6a3c601 in ?? () from /usr/lib/libmp3lame.so.0
#
#1  0x00000000 in ?? ()
#
 
#
Thread 3 (Thread 0xb3ca4b90 (LWP 7103)):
#
#0  0xb7f65430 in __kernel_vsyscall ()
#
#1  0xb7cbb0e5 in pthread_cond_wait@@GLIBC_2.3.2 ()
#
   from /lib/tls/i686/cmov/libpthread.so.0
#
#2  0xb6d96982 in QWaitCondition::wait ()
#
   from /usr/share/qt4/lib/libQtCore.so.4
#
#3  0x0815a6f8 in Reader::run (this=0x8e41320) at src/reader.cpp:252
#
#4  0xb6d9593e in ?? () from /usr/share/qt4/lib/libQtCore.so.4
#
#5  0xb7cb74ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#
#6  0xb687849e in clone () from /lib/tls/i686/cmov/libc.so.6
#
 
#
---Type <return> to continue, or q <return> to quit---
#
Thread 2 (Thread 0xb4ae6b90 (LWP 7102)):
#
#0  0xb7f65430 in __kernel_vsyscall ()
#
#1  0xb7cbb0e5 in pthread_cond_wait@@GLIBC_2.3.2 ()
#
   from /lib/tls/i686/cmov/libpthread.so.0
#
#2  0xb6d96982 in QWaitCondition::wait ()
#
   from /usr/share/qt4/lib/libQtCore.so.4
#
#3  0x0815a6f8 in Reader::run (this=0x8e5a988) at src/reader.cpp:252
#
#4  0xb6d9593e in ?? () from /usr/share/qt4/lib/libQtCore.so.4
#
#5  0xb7cb74ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#
#6  0xb687849e in clone () from /lib/tls/i686/cmov/libc.so.6
#
 
#
Thread 1 (Thread 0xb6160710 (LWP 6987)):
#
#0  0xb7f65430 in __kernel_vsyscall ()
#
#1  0xb686dae7 in poll () from /lib/tls/i686/cmov/libc.so.6
#
#2  0xb63276fb in IA__g_poll (fds=0x8f25f08, nfds=12, timeout=5)
#
    at /build/buildd/glib2.0-2.19.8/glib/gpoll.c:127
#
#3  0xb6319ef2 in g_main_context_iterate (context=0x8c4b110, block=1,
#
    dispatch=1, self=0x8c49148)
#
    at /build/buildd/glib2.0-2.19.8/glib/gmain.c:2761
#
#4  0xb631a1d8 in IA__g_main_context_iteration (context=0x8c4b110, may_block=1)
#
    at /build/buildd/glib2.0-2.19.8/glib/gmain.c:2511
#
#5  0xb6eb53a8 in QEventDispatcherGlib::processEvents ()
#
   from /usr/share/qt4/lib/libQtCore.so.4
#
---Type <return> to continue, or q <return> to quit---
#
#6  0xb7162a55 in ?? () from /usr/share/qt4/lib/libQtGui.so.4
#
#7  0xb6e87ffa in QEventLoop::processEvents ()
#
   from /usr/share/qt4/lib/libQtCore.so.4
#
#8  0xb6e8843a in QEventLoop::exec () from /usr/share/qt4/lib/libQtCore.so.4
#
#9  0xb6e8a8e9 in QCoreApplication::exec ()
#
   from /usr/share/qt4/lib/libQtCore.so.4
#
#10 0xb70c1497 in QApplication::exec () from /usr/share/qt4/lib/libQtGui.so.4
#
#11 0x080fe8e2 in main (argc=1, argv=0xbfa81494) at src/main.cpp:305
#
(gdb)
 
threads.txt · Last modified: 2009/03/02 15:10 by gamegod
 
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