Android: don't wait if the event loop is stopped

QAndroidEventDispatcherStopper is stopped when the application is in background
and the user uses the task manager to kill the task. If the application has
services the task manager doesn't kills it,  but instead it tries to gently
terminate the activity. The problem is that the activity is still backgrounded
(meaning that the Qt event loop is freezed), therefore terminateQt will hang.

Task-number: QTBUG-54012
Change-Id: I6e333cbcaf41e9e298eeb8b2b0bc3adcf446783f
Reviewed-by: Christian Stromme <christian.stromme@qt.io>

1 files changed, 10 insertions, 4 deletions

diff --git a/src/plugins/platforms/android/androidjnimain.cpp b/src/plugins/platforms/android/androidjnimain.cpp
index 671dad98b2..fe2401f561 100644
--- a/src/plugins/platforms/android/androidjnimain.cpp
+++ b/src/plugins/platforms/android/androidjnimain.cpp
@@ -539,8 +539,11 @@ static void quitQtAndroidPlugin(JNIEnv *env, jclass /*clazz*/)
 
 static void terminateQt(JNIEnv *env, jclass /*clazz*/)
 {
-    sem_wait(&m_terminateSemaphore);
-    sem_destroy(&m_terminateSemaphore);
+    // QAndroidEventDispatcherStopper is stopped when the user uses the task manager to kill the application
+    if (!QAndroidEventDispatcherStopper::instance()->stopped()) {
+        sem_wait(&m_terminateSemaphore);
+        sem_destroy(&m_terminateSemaphore);
+    }
     env->DeleteGlobalRef(m_applicationClass);
     env->DeleteGlobalRef(m_classLoaderObject);
     if (m_resourcesObj)
@@ -558,8 +561,11 @@ static void terminateQt(JNIEnv *env, jclass /*clazz*/)
     m_androidPlatformIntegration = nullptr;
     delete m_androidAssetsFileEngineHandler;
     m_androidAssetsFileEngineHandler = nullptr;
-    sem_post(&m_exitSemaphore);
-    pthread_join(m_qtAppThread, nullptr);
+
+    if (!QAndroidEventDispatcherStopper::instance()->stopped()) {
+        sem_post(&m_exitSemaphore);
+        pthread_join(m_qtAppThread, nullptr);
+    }
 }
 
 static void setSurface(JNIEnv *env, jobject /*thiz*/, jint id, jobject jSurface, jint w, jint h)