CppTools: Use a shared thread pool

Without this, too many threads are spawned, and loading a project takes
forever.

Change-Id: I3c22557ddd7bfb0c70f7b089c276432e3b003097
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/cpptools/builtineditordocumentprocessor.cpp

@@ -204,9 +204,11 @@ BuiltinEditorDocumentProcessor::~BuiltinEditorDocumentProcessor()
 
 void BuiltinEditorDocumentProcessor::run()
 {
-    m_parserFuture = Utils::runAsync(runParser,
+    CppModelManager *mgr = CppModelManager::instance();
+    m_parserFuture = Utils::runAsync(mgr->sharedThreadPool(),
+                                     runParser,
                                      parser(),
-                                     CppModelManager::instance()->workingCopy());
+                                     mgr->workingCopy());
 }
 
 BaseEditorDocumentParser::Ptr BuiltinEditorDocumentProcessor::parser()

src/plugins/cpptools/builtinindexingsupport.cpp

@@ -353,7 +353,7 @@ QFuture<void> BuiltinIndexingSupport::refreshSourceFiles(const QSet<QString> &so
     params.workingCopy = mgr->workingCopy();
     params.sourceFiles = sourceFiles;
 
-    QFuture<void> result = Utils::runAsync(parse, params);
+    QFuture<void> result = Utils::runAsync(mgr->sharedThreadPool(), parse, params);
 
     if (m_synchronizer.futures().size() > 10) {
         QList<QFuture<void> > futures = m_synchronizer.futures();

src/plugins/cpptools/cppfindreferences.cpp

@@ -365,7 +365,8 @@ void CppFindReferences::findAll_helper(SearchResult *search, Symbol *symbol,
     SearchResultWindow::instance()->popup(IOutputPane::ModeSwitch | IOutputPane::WithFocus);
     const WorkingCopy workingCopy = m_modelManager->workingCopy();
     QFuture<Usage> result;
-    result = Utils::runAsync(find_helper, workingCopy, context, symbol);
+    result = Utils::runAsync(m_modelManager->sharedThreadPool(), find_helper,
+                             workingCopy, context, symbol);
     createWatcher(result, search);
 
     FutureProgress *progress = ProgressManager::addTask(result, tr("Searching for Usages"),
@@ -669,7 +670,8 @@ void CppFindReferences::findMacroUses(const Macro &macro, const QString &replace
     }
 
     QFuture<Usage> result;
-    result = Utils::runAsync(findMacroUses_helper, workingCopy, snapshot, macro);
+    result = Utils::runAsync(m_modelManager->sharedThreadPool(), findMacroUses_helper,
+                             workingCopy, snapshot, macro);
     createWatcher(result, search);
 
     FutureProgress *progress = ProgressManager::addTask(result, tr("Searching for Usages"),

src/plugins/cpptools/cppmodelmanager.cpp

@@ -58,6 +58,7 @@
 #include <QDir>
 #include <QMutexLocker>
 #include <QTextBlock>
+#include <QThreadPool>
 #include <QTimer>
 
 #if defined(QTCREATOR_WITH_DUMP_AST) && defined(Q_CC_GNU)
@@ -157,6 +158,7 @@ public:
     CppFindReferences *m_findReferences;
 
     SymbolFinder m_symbolFinder;
+    QThreadPool m_threadPool;
 
     bool m_enableGC;
     QTimer m_delayedGcTimer;
@@ -1196,4 +1198,9 @@ SymbolFinder *CppModelManager::symbolFinder()
     return &d->m_symbolFinder;
 }
 
+QThreadPool *CppModelManager::sharedThreadPool()
+{
+    return &d->m_threadPool;
+}
+
 } // namespace CppTools

src/plugins/cpptools/cppmodelmanager.h

@@ -162,6 +162,8 @@ public:
 
     SymbolFinder *symbolFinder();
 
+    QThreadPool *sharedThreadPool();
+
     static QSet<QString> timeStampModifiedFiles(const QList<Document::Ptr> &documentsToCheck);
 
     static Internal::CppSourceProcessor *createSourceProcessor();

src/plugins/cpptools/cppsemanticinfoupdater.cpp

@@ -26,6 +26,7 @@
 #include "cppsemanticinfoupdater.h"
 
 #include "cpplocalsymbols.h"
+#include "cppmodelmanager.h"
 
 #include <utils/qtcassert.h>
 #include <utils/runextensions.h>
@@ -200,7 +201,8 @@ void SemanticInfoUpdater::updateDetached(const SemanticInfo::Source source)
         return;
     }
 
-    d->m_future = Utils::runAsync(&SemanticInfoUpdaterPrivate::update_helper, d.data(), source);
+    d->m_future = Utils::runAsync(CppModelManager::instance()->sharedThreadPool(),
+                                  &SemanticInfoUpdaterPrivate::update_helper, d.data(), source);
 }
 
 SemanticInfo SemanticInfoUpdater::semanticInfo() const

src/plugins/cpptools/symbolsfindfilter.cpp

@@ -145,7 +145,8 @@ void SymbolsFindFilter::startSearch(SearchResult *search)
     SymbolSearcher *symbolSearcher = m_manager->indexingSupport()->createSymbolSearcher(parameters, projectFileNames);
     connect(watcher, SIGNAL(finished()),
             symbolSearcher, SLOT(deleteLater()));
-    watcher->setFuture(Utils::runAsync(&SymbolSearcher::runSearch, symbolSearcher));
+    watcher->setFuture(Utils::runAsync(m_manager->sharedThreadPool(),
+                                       &SymbolSearcher::runSearch, symbolSearcher));
     FutureProgress *progress = ProgressManager::addTask(watcher->future(), tr("Searching for Symbol"),
                                                         Core::Constants::TASK_SEARCH);
     connect(progress, SIGNAL(clicked()), search, SLOT(popup()));