From 884e95cc985ccf3a7d9de9ebe0d9b1bbd2d9e706 Mon Sep 17 00:00:00 2001
From: Peter Penz <peter.penz19@gmail.com>
Date: Wed, 24 Mar 2010 22:21:09 +0000
Subject: Version control: Move the maintainance of pending threads into a
 custom class. Also the UpdateItemStatesThread differs now between protecting
 the globally shared plugin and the locally shared data.

svn path=/trunk/KDE/kdebase/apps/; revision=1107125
---
 src/versioncontrol/updateitemstatesthread.cpp | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

(limited to 'src/versioncontrol/updateitemstatesthread.cpp')

diff --git a/src/versioncontrol/updateitemstatesthread.cpp b/src/versioncontrol/updateitemstatesthread.cpp
index 0cd5b93e1..020cdb0d0 100644
--- a/src/versioncontrol/updateitemstatesthread.cpp
+++ b/src/versioncontrol/updateitemstatesthread.cpp
@@ -19,17 +19,21 @@
 
 #include "updateitemstatesthread.h"
 
+#include <QMutexLocker>
+
 UpdateItemStatesThread::UpdateItemStatesThread() :
     QThread(),
-    m_retrievedItems(false),  
-    m_mutex(0),
+    m_globalPluginMutex(0),
+    m_plugin(0),
+    m_itemMutex(),
+    m_retrievedItems(false),
     m_itemStates()
 {
     // Several threads may share one instance of a plugin. A global
     // mutex is required to serialize the retrieval of version control
     // states inside run().
     static QMutex globalMutex;
-    m_mutex = &globalMutex;
+    m_globalPluginMutex = &globalMutex;
 }
 
 UpdateItemStatesThread::~UpdateItemStatesThread()
@@ -39,8 +43,11 @@ UpdateItemStatesThread::~UpdateItemStatesThread()
 void UpdateItemStatesThread::setData(KVersionControlPlugin* plugin,
                                      const QList<VersionControlObserver::ItemState>& itemStates)
 {
-    m_plugin = plugin;
+    QMutexLocker itemLocker(&m_itemMutex);
     m_itemStates = itemStates;
+
+    QMutexLocker pluginLocker(m_globalPluginMutex);
+    m_plugin = plugin;
 }
 
 void UpdateItemStatesThread::run()
@@ -52,11 +59,14 @@ void UpdateItemStatesThread::run()
     // plugin requires the root directory for KVersionControlPlugin::beginRetrieval(). Instead
     // of doing an expensive search, we utilize the knowledge of the implementation of
     // VersionControlObserver::addDirectory() to be sure that the last item contains the root.
+    QMutexLocker itemLocker(&m_itemMutex);
     const QString directory = m_itemStates.last().item.url().directory(KUrl::AppendTrailingSlash);
+    itemLocker.unlock();
 
-    QMutexLocker locker(m_mutex);
+    QMutexLocker pluginLocker(m_globalPluginMutex);
     m_retrievedItems = false;
     if (m_plugin->beginRetrieval(directory)) {
+        itemLocker.relock();
         const int count = m_itemStates.count();
         for (int i = 0; i < count; ++i) {
             m_itemStates[i].version = m_plugin->versionState(m_itemStates[i].item);
@@ -68,21 +78,23 @@ void UpdateItemStatesThread::run()
 
 bool UpdateItemStatesThread::beginReadItemStates()
 {
-    return m_mutex->tryLock(300);
+    return m_itemMutex.tryLock(300);
 }
 
 void UpdateItemStatesThread::endReadItemStates()
 {
-    m_mutex->unlock();
+    m_itemMutex.unlock();
 }
 
 QList<VersionControlObserver::ItemState> UpdateItemStatesThread::itemStates() const
 {
+    QMutexLocker locker(&m_itemMutex);
     return m_itemStates;
 }
 
 bool UpdateItemStatesThread::retrievedItems() const
 {
+    QMutexLocker locker(&m_itemMutex);
     return m_retrievedItems;
 }
 
-- 
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