add multithreaded

src/persistence/db/plaindb.cpp

@@ -26,12 +26,14 @@ PlainDb::PlainDb(const QString &db_name, QList<QString> initList)
 {
     db = new QSqlDatabase();
     *db = QSqlDatabase::addDatabase("QSQLITE");
+    db->setConnectOptions("QSQLITE_ENABLE_SHARED_CACHE=1");
     db->setDatabaseName(db_name);
 
     if (!db->open())
     {
         qWarning() << QString("Can't open file: %1, history will not be saved!").arg(db_name);
         db->setDatabaseName(":memory:");
+        db->setConnectOptions();
         db->open();
     }
 

src/persistence/historykeeper.cpp

@@ -36,9 +36,11 @@
 #include "src/persistence/db/encrypteddb.h"
 
 static HistoryKeeper *historyInstance = nullptr;
+QMutex HistoryKeeper::historyMutex;
 
 HistoryKeeper *HistoryKeeper::getInstance()
 {
+    historyMutex.lock();
     if (historyInstance == nullptr)
     {
         QList<QString> initLst;
@@ -67,6 +69,7 @@ HistoryKeeper *HistoryKeeper::getInstance()
         dbIntf = new PlainDb(path, initLst);
         historyInstance = new HistoryKeeper(dbIntf);
     }
+    historyMutex.unlock();
 
     return historyInstance;
 }

src/persistence/historykeeper.h

@@ -24,6 +24,7 @@
 #include <QList>
 #include <QDateTime>
 #include <QPixmap>
+#include <QMutex>
 #include <tox/toxencryptsave.h>
 
 class GenericDdInterface;
@@ -33,6 +34,7 @@ class HistoryKeeper
 {
 public:
     enum ChatType {ctSingle = 0, ctGroup};
+    static QMutex historyMutex;
 
     struct HistMessage
     {