Use the global thread pool, like the docs suggest

novelwriter/__init__.py

@@ -73,7 +73,7 @@ logger = logging.getLogger(__name__)
 #  Main Program
 ##
 
-# Global config singleton
+# Global config and data singletons
 CONFIG = Config()
 SHARED = SharedData()
 

novelwriter/shared.py

@@ -68,10 +68,6 @@ class SharedData(QObject):
         self._idleTime = 0.0
         self._idleRefTime = time()
 
-        # Threading
-        self._threadPool = QThreadPool(self)
-        self._threadPool.setMaxThreadCount(5)
-
         return
 
     ##
@@ -138,7 +134,8 @@ class SharedData(QObject):
         self._gui = gui
         self._theme = theme
         self._resetProject()
-        logger.debug("SharedData instance initialised")
+        logger.debug("Ready: SharedData")
+        logger.debug("Thread Pool Max Count: %d", QThreadPool.globalInstance().maxThreadCount())
         return
 
     def openProject(self, path: str | Path, clearLock: bool = False) -> bool:
@@ -210,7 +207,7 @@ class SharedData(QObject):
 
     def runInThreadPool(self, runnable: QRunnable, priority: int = 0) -> None:
         """Queue a runnable in the application thread pool."""
-        self._threadPool.start(runnable, priority=priority)
+        QThreadPool.globalInstance().start(runnable, priority=priority)
         return
 
     ##

tests/test_gui/test_gui_doceditor.py

@@ -24,7 +24,7 @@ import pytest
 from mocked import causeOSError
 from tools import C, buildTestProject
 
-from PyQt5.QtCore import Qt
+from PyQt5.QtCore import QThreadPool, Qt
 from PyQt5.QtGui import QTextBlock, QTextCursor, QTextOption
 from PyQt5.QtWidgets import QAction, qApp
 
@@ -1107,7 +1107,7 @@ def testGuiEditor_WordCounters(qtbot, monkeypatch, nwGUI, projPath, ipsumText, m
             return self._objID
 
     threadPool = MockThreadPool()
-    monkeypatch.setattr(SHARED, "_threadPool", threadPool)
+    monkeypatch.setattr(QThreadPool, "globalInstance", lambda *a: threadPool)
     nwGUI.docEditor.wcTimerDoc.blockSignals(True)
     nwGUI.docEditor.wcTimerSel.blockSignals(True)
 
@@ -1146,7 +1146,7 @@ def testGuiEditor_WordCounters(qtbot, monkeypatch, nwGUI, projPath, ipsumText, m
 
     # Run the full word counter
     nwGUI.docEditor._runDocCounter()
-    assert SHARED._threadPool.objectID() == id(nwGUI.docEditor.wCounterDoc)
+    assert threadPool.objectID() == id(nwGUI.docEditor.wCounterDoc)
 
     nwGUI.docEditor.wCounterDoc.run()
     # nwGUI.docEditor._updateDocCounts(cC, wC, pC)
@@ -1162,7 +1162,7 @@ def testGuiEditor_WordCounters(qtbot, monkeypatch, nwGUI, projPath, ipsumText, m
 
     # Run the selection word counter
     nwGUI.docEditor._runSelCounter()
-    assert SHARED._threadPool.objectID() == id(nwGUI.docEditor.wCounterSel)
+    assert threadPool.objectID() == id(nwGUI.docEditor.wCounterSel)
 
     nwGUI.docEditor.wCounterSel.run()
     # nwGUI.docEditor._updateSelCounts(cC, wC, pC)