qmljs: reduce used threads

Change-Id: I8f27037d0cfefd65f1ac060e1505328ea705a670
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

3 files changed, 22 insertions, 7 deletions

diff --git a/src/libs/qmljs/qmljsmodelmanagerinterface.cpp b/src/libs/qmljs/qmljsmodelmanagerinterface.cpp
index 444d429a4b..af0b975542 100644
--- a/src/libs/qmljs/qmljsmodelmanagerinterface.cpp
+++ b/src/libs/qmljs/qmljsmodelmanagerinterface.cpp
@@ -111,6 +111,7 @@ ModelManagerInterface::ModelManagerInterface(QObject *parent)
       m_defaultImportPaths(environmentImportPaths()),
       m_pluginDumper(new PluginDumper(this))
 {
+    m_threadPool.setMaxThreadCount(4);
     m_futureSynchronizer.setCancelOnWait(false);
     m_indexerDisabled = qEnvironmentVariableIsSet("QTC_NO_CODE_INDEXER");
 
@@ -326,6 +327,11 @@ Snapshot ModelManagerInterface::newestSnapshot() const
     return m_newestSnapshot;
 }
 
+QThreadPool *ModelManagerInterface::threadPool()
+{
+    return &m_threadPool;
+}
+
 void ModelManagerInterface::updateSourceFiles(const QStringList &files,
                                               bool emitDocumentOnDiskChanged)
 {
@@ -340,7 +346,8 @@ QFuture<void> ModelManagerInterface::refreshSourceFiles(const QStringList &sourc
     if (sourceFiles.isEmpty())
         return QFuture<void>();
 
-    QFuture<void> result = Utils::runAsync(&ModelManagerInterface::parse,
+    QFuture<void> result = Utils::runAsync(&m_threadPool,
+                                           &ModelManagerInterface::parse,
                                            workingCopyInternal(), sourceFiles,
                                            this, Dialect(Dialect::Qml),
                                            emitDocumentOnDiskChanged);
@@ -368,9 +375,13 @@ QFuture<void> ModelManagerInterface::refreshSourceFiles(const QStringList &sourc
 
 void ModelManagerInterface::fileChangedOnDisk(const QString &path)
 {
-    addFuture(Utils::runAsync(&ModelManagerInterface::parse,
-                    workingCopyInternal(), QStringList(path),
-                    this, Dialect(Dialect::AnyLanguage), true));
+    addFuture(Utils::runAsync(&m_threadPool,
+                              &ModelManagerInterface::parse,
+                              workingCopyInternal(),
+                              QStringList(path),
+                              this,
+                              Dialect(Dialect::AnyLanguage),
+                              true));
 }
 
 void ModelManagerInterface::removeFiles(const QStringList &files)
@@ -1191,7 +1202,8 @@ void ModelManagerInterface::maybeScan(const PathsAndLanguages &importPaths)
     }
 
     if (pathToScan.length() >= 1) {
-        QFuture<void> result = Utils::runAsync(&ModelManagerInterface::importScan,
+        QFuture<void> result = Utils::runAsync(&m_threadPool,
+                                               &ModelManagerInterface::importScan,
                                                workingCopyInternal(), pathToScan,
                                                this, true, true, false);
         addFuture(result);
diff --git a/src/libs/qmljs/qmljsmodelmanagerinterface.h b/src/libs/qmljs/qmljsmodelmanagerinterface.h
index 4ed02c2c96..b0b28e8d1a 100644
--- a/src/libs/qmljs/qmljsmodelmanagerinterface.h
+++ b/src/libs/qmljs/qmljsmodelmanagerinterface.h
@@ -133,6 +133,7 @@ public:
 
     QmlJS::Snapshot snapshot() const;
     QmlJS::Snapshot newestSnapshot() const;
+    QThreadPool *threadPool();
 
     void activateScan();
     void updateSourceFiles(const QStringList &files,
@@ -287,6 +288,7 @@ private:
     Utils::FutureSynchronizer m_futureSynchronizer;
 
     bool m_indexerDisabled = false;
+    QThreadPool m_threadPool;
 };
 
 } // namespace QmlJS
diff --git a/src/libs/qmljs/qmljsplugindumper.cpp b/src/libs/qmljs/qmljsplugindumper.cpp
index 56d444f9d9..0a13fefba9 100644
--- a/src/libs/qmljs/qmljsplugindumper.cpp
+++ b/src/libs/qmljs/qmljsplugindumper.cpp
@@ -290,7 +290,8 @@ void PluginDumper::qmlPluginTypeDumpDone(QtcProcess *process)
             QStringList dependencies;
         };
 
-        auto future = Utils::runAsync([output, libraryPath](QFutureInterface<CppQmlTypesInfo>& future)
+        auto future = Utils::runAsync(m_modelManager->threadPool(),
+                                      [output, libraryPath](QFutureInterface<CppQmlTypesInfo>& future)
         {
             CppQmlTypesInfo infos;
             CppQmlTypesLoader::parseQmlTypeDescriptions(output, &infos.objectsList, &infos.moduleApis, &infos.dependencies,
@@ -343,7 +344,7 @@ void PluginDumper::pluginChanged(const QString &pluginLibrary)
 
 QFuture<PluginDumper::QmlTypeDescription> PluginDumper::loadQmlTypeDescription(const FilePaths &paths) const
 {
-    auto future = Utils::runAsync([=](QFutureInterface<PluginDumper::QmlTypeDescription> &future)
+    auto future = Utils::runAsync(m_modelManager->threadPool(), [=](QFutureInterface<PluginDumper::QmlTypeDescription> &future)
     {
         PluginDumper::QmlTypeDescription result;