Example Flow Graph for GNURadio Qt Threading Issue - With hacky workaround

qt_thread_bug_workaround.grc

options:
  parameters:
    author: florian
    catch_exceptions: 'True'
    category: '[GRC Hier Blocks]'
    cmake_opt: ''
    comment: ''
    copyright: ''
    description: ''
    gen_cmake: 'On'
    gen_linking: dynamic
    generate_options: qt_gui
    hier_block_src_path: '.:'
    id: bugfixed
    max_nouts: '0'
    output_language: python
    placement: (0,0)
    qt_qss_theme: ''
    realtime_scheduling: ''
    run: 'True'
    run_command: '{python} -u {filename}'
    run_options: prompt
    sizing_mode: fixed
    thread_safe_setters: ''
    title: Not titled yet
    window_size: (1000,1000)
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [8, 8]
    rotation: 0
    state: enabled

blocks:
- name: measured_rate
  id: variable
  parameters:
    comment: ''
    value: '0'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1184, 292.0]
    rotation: 0
    state: true
- name: measured_rate_qtthread
  id: variable
  parameters:
    comment: ''
    value: '100'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1184, 428.0]
    rotation: 0
    state: true
- name: true_samp_rate
  id: variable_qtgui_range
  parameters:
    comment: ''
    gui_hint: ''
    label: True Sample Rate
    min_len: '200'
    orient: QtCore.Qt.Horizontal
    rangeType: int
    start: '30000'
    step: '1'
    stop: '200000'
    value: '44000'
    widget: counter_slider
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [288, 16.0]
    rotation: 0
    state: true
- name: analog_sig_source_x_0
  id: analog_sig_source_x
  parameters:
    affinity: ''
    alias: ''
    amp: '1'
    comment: ''
    freq: '1000'
    maxoutbuf: '0'
    minoutbuf: '0'
    offset: '0'
    phase: '0'
    samp_rate: true_samp_rate
    type: complex
    waveform: analog.GR_COS_WAVE
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [120, 196.0]
    rotation: 0
    state: true
- name: blocks_msg_meta_to_pair_0
  id: blocks_msg_meta_to_pair
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    keyin: rate_now
    keyout: rate
    maxoutbuf: '0'
    minoutbuf: '0'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [864, 228.0]
    rotation: 0
    state: true
- name: blocks_msgpair_to_var_0
  id: blocks_msgpair_to_var
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    target: measured_rate
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1184, 236.0]
    rotation: 0
    state: true
- name: blocks_probe_rate_0
  id: blocks_probe_rate
  parameters:
    affinity: ''
    alias: ''
    alpha: '0.01'
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    mintime: '200.0'
    type: complex
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [592, 228.0]
    rotation: 0
    state: true
- name: blocks_throttle_0
  id: blocks_throttle
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    ignoretag: 'True'
    maxoutbuf: '0'
    minoutbuf: '0'
    samples_per_second: true_samp_rate
    type: complex
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [376, 236.0]
    rotation: 0
    state: true
- name: qt_variable_update_0
  id: qt_variable_update
  parameters:
    alias: ''
    comment: ''
    target: measured_rate_qtthread
    value: measured_rate
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1184, 364.0]
    rotation: 0
    state: true
- name: qtgui_time_sink_x_0
  id: qtgui_time_sink_x
  parameters:
    affinity: ''
    alias: ''
    alpha1: '1.0'
    alpha10: '1.0'
    alpha2: '1.0'
    alpha3: '1.0'
    alpha4: '1.0'
    alpha5: '1.0'
    alpha6: '1.0'
    alpha7: '1.0'
    alpha8: '1.0'
    alpha9: '1.0'
    autoscale: 'False'
    axislabels: 'True'
    color1: blue
    color10: dark blue
    color2: red
    color3: green
    color4: black
    color5: cyan
    color6: magenta
    color7: yellow
    color8: dark red
    color9: dark green
    comment: ''
    ctrlpanel: 'False'
    entags: 'True'
    grid: 'False'
    gui_hint: ''
    label1: Signal 1
    label10: Signal 10
    label2: Signal 2
    label3: Signal 3
    label4: Signal 4
    label5: Signal 5
    label6: Signal 6
    label7: Signal 7
    label8: Signal 8
    label9: Signal 9
    legend: 'True'
    marker1: '-1'
    marker10: '-1'
    marker2: '-1'
    marker3: '-1'
    marker4: '-1'
    marker5: '-1'
    marker6: '-1'
    marker7: '-1'
    marker8: '-1'
    marker9: '-1'
    name: '""'
    nconnections: '1'
    size: '1024'
    srate: measured_rate_qtthread
    stemplot: 'False'
    style1: '1'
    style10: '1'
    style2: '1'
    style3: '1'
    style4: '1'
    style5: '1'
    style6: '1'
    style7: '1'
    style8: '1'
    style9: '1'
    tr_chan: '0'
    tr_delay: '0'
    tr_level: '0.0'
    tr_mode: qtgui.TRIG_MODE_FREE
    tr_slope: qtgui.TRIG_SLOPE_POS
    tr_tag: '""'
    type: complex
    update_time: '0.10'
    width1: '1'
    width10: '1'
    width2: '1'
    width3: '1'
    width4: '1'
    width5: '1'
    width6: '1'
    width7: '1'
    width8: '1'
    width9: '1'
    ylabel: Amplitude
    ymax: '1'
    ymin: '-1'
    yunit: '""'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [600, 324.0]
    rotation: 0
    state: true

connections:
- [analog_sig_source_x_0, '0', blocks_throttle_0, '0']
- [blocks_msg_meta_to_pair_0, outpair, blocks_msgpair_to_var_0, inpair]
- [blocks_probe_rate_0, rate, blocks_msg_meta_to_pair_0, inmeta]
- [blocks_throttle_0, '0', blocks_probe_rate_0, '0']
- [blocks_throttle_0, '0', qtgui_time_sink_x_0, '0']

metadata:
  file_format: 1