1 files changed, 6 insertions, 9 deletions

diff --git a/qmake/tools/qcomlibrary.cpp b/qmake/tools/qcomlibrary.cpp
index a7162fc..2a1b75a 100644
--- a/qmake/tools/qcomlibrary.cpp
+++ b/qmake/tools/qcomlibrary.cpp
@@ -54,24 +54,28 @@
 #endif
 
 
 QComLibrary::QComLibrary( const QString &filename )
     : QLibrary( filename ), entry( 0 ), libiface( 0 ), qt_version( 0 )
 {
 }
 
 QComLibrary::~QComLibrary()
 {
     if ( autoUnload() )
         unload();
+    if ( libiface )
+        libiface->release();
+    if ( entry )
+        entry->release();
 }
 
 bool QComLibrary::unload()
 {
     if ( libiface ) {
         libiface->cleanup();
         if ( !libiface->canUnload() )
             return FALSE;
         libiface->release();
         libiface = 0;
     }
     int refs = entry ? entry->release() : 0;
@@ -382,49 +386,47 @@ void QComLibrary::createInstanceInternal()
     QFileInfo fileinfo( library() );
     QString lastModified  = fileinfo.lastModified().toString();
     QString regkey = QString("/Qt Plugins %1.%2/%3")
                      .arg( ( QT_VERSION & 0xff0000 ) >> 16 )
                      .arg( ( QT_VERSION & 0xff00 ) >> 8 )
                      .arg( library() );
     QStringList reg;
     uint flags = 0;
     QCString key;
     bool query_done = FALSE;
     bool warn_mismatch = TRUE;
 
-    if ( ! query_done ) {
-
 #ifdef QT_THREAD_SUPPORT
-        QMutexLocker locker( qt_global_mutexpool->get( &cache ) );
+    QMutexLocker locker( qt_global_mutexpool ?
+                         qt_global_mutexpool->get( &cache ) : 0 );
 #endif // QT_THREAD_SUPPORT
 
         if ( ! cache ) {
             cache = new QSettings;
             cache->insertSearchPath( QSettings::Windows, "/Trolltech" );
             cleanup_cache.set( &cache );
         }
 
         reg = cache->readListEntry( regkey );
         if ( reg.count() == 4 ) {
             // check timestamp
             if ( lastModified == reg[3] ) {
                 qt_version = reg[0].toUInt(0, 16);
                 flags = reg[1].toUInt(0, 16);
                 key = reg[2].latin1();
 
                 query_done = TRUE;
                 warn_mismatch = FALSE;
             }
         }
-    }
 
 #if defined(Q_OS_UNIX)
     if ( ! query_done ) {
         // get the query information directly from the plugin without loading
         if ( qt_unix_query( library(), &qt_version, &flags, &key ) ) {
              // info read succesfully from library
              query_done = TRUE;
         }
     }
 #else // !Q_OS_UNIX
     if ( ! query_done ) {
         // get the query information by loading the plugin
@@ -452,29 +454,24 @@ void QComLibrary::createInstanceInternal()
             query_done = TRUE;
         }
     }
 #endif // Q_OS_UNIX
 
     QStringList queried;
     queried << QString::number( qt_version,16 )
             << QString::number( flags, 16 )
             <<  key
             << lastModified;
 
     if ( queried != reg ) {
-
-#ifdef QT_THREAD_SUPPORT
-        QMutexLocker locker( qt_global_mutexpool->get( &cache ) );
-#endif // QT_THREAD_SUPPORT
-
         cache->writeEntry( regkey, queried );
         // delete the cache, which forces the settings to be written
         delete cache;
         cache = 0;
     }
 
     if ( ! query_done ) {
         if ( warn_mismatch ) {
             qWarning( "Conflict in %s:\n Plugin cannot be queried successfully!",
                       (const char*) QFile::encodeName( library() ) );
         }
         unload();