From 648bf773b1aa759a40d8609039c44f9dce31da61 Mon Sep 17 00:00:00 2001
From: Ritt Konstantin <qnx@ics.com>
Date: Tue, 21 Jun 2011 13:51:04 +0200
Subject: use RoundRobin scheduler by default on QNX

otherwise drawn intensive apps will hog the cpu
and make the system appear frozen

Merge-request: 1259
Reviewed-by: Harald Fernengel <harald.fernengel@nokia.com>
---
 src/corelib/kernel/qcoreapplication.cpp | 16 ++++++++++++++++
 src/corelib/thread/qthread_unix.cpp     |  5 +++++
 2 files changed, 21 insertions(+)

diff --git a/src/corelib/kernel/qcoreapplication.cpp b/src/corelib/kernel/qcoreapplication.cpp
index 7694a0f..c818ffc 100644
--- a/src/corelib/kernel/qcoreapplication.cpp
+++ b/src/corelib/kernel/qcoreapplication.cpp
@@ -98,6 +98,11 @@
 #  include <taskLib.h>
 #endif
 
+#ifdef Q_OS_QNX
+#  include <pthread.h>
+#  include <sched.h>
+#endif
+
 QT_BEGIN_NAMESPACE
 
 class QMutexUnlocker
@@ -353,6 +358,17 @@ QCoreApplicationPrivate::QCoreApplicationPrivate(int &aargc, char **aargv, uint
     qt_application_thread_id = QThread::currentThreadId();
 #endif
 
+#ifdef Q_OS_QNX
+    // without Round Robin drawn intensive apps will hog the cpu
+    // and make the system appear frozen
+    int sched_policy;
+    sched_param param;
+    if (pthread_getschedparam(0, &sched_policy, &param) == 0 && sched_policy != SCHED_RR) {
+        sched_policy = SCHED_RR;
+        pthread_setschedparam(0, sched_policy, &param);
+    }
+#endif
+
     // note: this call to QThread::currentThread() may end up setting theMainThread!
     if (QThread::currentThread() != theMainThread)
         qWarning("WARNING: QApplication was not created in the main() thread.");
diff --git a/src/corelib/thread/qthread_unix.cpp b/src/corelib/thread/qthread_unix.cpp
index 839a396..765969e 100644
--- a/src/corelib/thread/qthread_unix.cpp
+++ b/src/corelib/thread/qthread_unix.cpp
@@ -479,6 +479,11 @@ void QThread::usleep(unsigned long usecs)
 // sched_priority is OUT only
 static bool calculateUnixPriority(int priority, int *sched_policy, int *sched_priority)
 {
+#ifdef Q_OS_QNX
+    // without Round Robin drawn intensive apps will hog the cpu
+    // and make the system appear frozen
+   *sched_policy = SCHED_RR;
+#endif
 #ifdef SCHED_IDLE
     if (priority == QThread::IdlePriority) {
         *sched_policy = SCHED_IDLE;
-- 
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