From 6ae96c3c1ddd6d3b7f8376a6b5f1ef2c5431b541 Mon Sep 17 00:00:00 2001
From: Ivailo Monev <xakepa10@gmail.com>
Date: Tue, 6 Jun 2023 16:07:14 +0300
Subject: [PATCH] kdecore: do not block while parsing files in KDeviceDatabase

parsing ~30k lines and filling maps for the entries takes some time and
could block the events of kinfocenter for example which is noticable
because the parsing of files is delayed until a KDeviceDatabase query is
made

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
---
 kdecore/util/kdevicedatabase.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kdecore/util/kdevicedatabase.cpp b/kdecore/util/kdevicedatabase.cpp
index a4d559af..8eac0867 100644
--- a/kdecore/util/kdevicedatabase.cpp
+++ b/kdecore/util/kdevicedatabase.cpp
@@ -21,6 +21,9 @@
 #include "kdebug.h"
 
 #include <QFile>
+#include <QCoreApplication>
+
+#define KDEVICEDATABASE_TIMEOUT 100
 
 struct KDeviceEntry
 {
@@ -75,12 +78,19 @@ static void extractIDs(QFile *idsfile,
 {
     // qDebug() << Q_FUNC_INFO << idsfile->fileName();
 
+    int counter = 0;
     char idbuffer[5];
     char strbuffer[1024];
     bool classessection = false;
     QByteArray lastvendorid;
     QByteArray lastdeviceid;
     while (!idsfile->atEnd()) {
+        counter++;
+        if (counter >= KDEVICEDATABASE_TIMEOUT) {
+            QCoreApplication::processEvents(QEventLoop::AllEvents, KDEVICEDATABASE_TIMEOUT);
+            counter = 0;
+        }
+
         const QByteArray dbline = idsfile->readLine();
         const QByteArray trimmeddbline = dbline.trimmed();
         // qDebug() << Q_FUNC_INFO << dbline;