Create cleanup stack in idleDetectorThread

This is to fix a crash problem in idleDetectorThread.
idleDetectorThread implementation may use cleanup stack.
The culprit is QSysInfo::symbianVersion, which is called in QMutex
implementation. The first call of QSysInfo::symbianVersion
uses functions with cleanup stack usage. Later calls use cached
version info and do not need cleanup stack. Without this fix, if
idleDetectorThread starts before version information is cached,
a crash happens.

Reviewed-by: mread

1 files changed, 5 insertions, 0 deletions

diff --git a/src/corelib/kernel/qeventdispatcher_symbian.cpp b/src/corelib/kernel/qeventdispatcher_symbian.cpp
index fca2feb937..2d01cda410 100644
--- a/src/corelib/kernel/qeventdispatcher_symbian.cpp
+++ b/src/corelib/kernel/qeventdispatcher_symbian.cpp
@@ -846,10 +846,15 @@ private:
 
     void IdleLoop()
     {
+        // Create cleanup stack. 
+        // Mutex handling may contain cleanupstack usage.
+        CTrapCleanup *cleanup = CTrapCleanup::New();
+        q_check_ptr(cleanup);
         while (!m_stop) {
             m_kick.acquire();
             m_state = STATE_RUN;
         }
+        delete cleanup;
     }
 
     static void StopIdleDetectorThread();