Merge remote-tracking branch 'origin/tqtc/lts-5.15.14' into tqtc/lts-5.15-opensourcev5.15.14-lts-lgpl5.15

Change-Id: I6a0402cd1c4df0733479e52a381526f0b5e75837

2 files changed, 31 insertions, 5 deletions

diff --git a/src/jar/src/org/qtproject/qt5/android/view/QtAndroidWebViewController.java b/src/jar/src/org/qtproject/qt5/android/view/QtAndroidWebViewController.java
index ebfe8da..366be27 100644
--- a/src/jar/src/org/qtproject/qt5/android/view/QtAndroidWebViewController.java
+++ b/src/jar/src/org/qtproject/qt5/android/view/QtAndroidWebViewController.java
@@ -90,6 +90,7 @@ public class QtAndroidWebViewController
     private native void c_onReceivedTitle(long id, String title);
     private native void c_onRunJavaScriptResult(long id, long callbackId, String result);
     private native void c_onReceivedError(long id, int errorCode, String description, String url);
+    private native void c_processEventsFromQueue();
 
     // We need to block the UI thread in some cases, if it takes to long we should timeout before
     // ANR kicks in... Usually the hard limit is set to 10s and if exceed that then we're in trouble.
@@ -257,10 +258,19 @@ public class QtAndroidWebViewController
             }
         });
 
-        try {
-            sem.acquire();
-        } catch (Exception e) {
-            e.printStackTrace();
+        boolean semAcquired = false;
+        while (!semAcquired) {
+            try {
+                semAcquired = sem.tryAcquire(BLOCKING_TIMEOUT, TimeUnit.MILLISECONDS);
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+            if (!semAcquired) {
+                // If the waiting time elapsed before a permit was acquired probably we have a
+                // deadlock here. To unlock the thread that block us, we need to process events
+                // from the queue and try again.
+                c_processEventsFromQueue();
+            }
         }
     }
 
diff --git a/src/plugins/android/qandroidwebview.cpp b/src/plugins/android/qandroidwebview.cpp
index 91122bd..29e3cf2 100644
--- a/src/plugins/android/qandroidwebview.cpp
+++ b/src/plugins/android/qandroidwebview.cpp
@@ -48,6 +48,9 @@
 #include <QtCore/qurl.h>
 #include <QtCore/qdebug.h>
 
+#include <QAbstractEventDispatcher>
+#include <QThread>
+
 QT_BEGIN_NAMESPACE
 
 static const char qtAndroidWebViewControllerClass[] = "org/qtproject/qt5/android/view/QtAndroidWebViewController";
@@ -407,6 +410,18 @@ static void c_onReceivedError(JNIEnv *env,
     Q_EMIT wc->loadingChanged(loadRequest);
 }
 
+static void c_processEventsFromQueue(JNIEnv *env, jobject thiz)
+{
+    Q_UNUSED(env)
+    Q_UNUSED(thiz)
+    if (QThread::currentThread() == qGuiApp->thread()) {
+        auto eventDispatcher = QThread::currentThread()->eventDispatcher();
+        if (eventDispatcher)
+            eventDispatcher->processEvents(
+                    QEventLoop::ExcludeUserInputEvents|QEventLoop::ExcludeSocketNotifiers);
+    }
+}
+
 JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* /*reserved*/)
 {
     static bool initialized = false;
@@ -438,7 +453,8 @@ JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* /*reserved*/)
         {"c_onReceivedIcon", "(JLandroid/graphics/Bitmap;)V", reinterpret_cast<void *>(c_onReceivedIcon)},
         {"c_onReceivedTitle", "(JLjava/lang/String;)V", reinterpret_cast<void *>(c_onReceivedTitle)},
         {"c_onRunJavaScriptResult", "(JJLjava/lang/String;)V", reinterpret_cast<void *>(c_onRunJavaScriptResult)},
-        {"c_onReceivedError", "(JILjava/lang/String;Ljava/lang/String;)V", reinterpret_cast<void *>(c_onReceivedError)}
+        {"c_onReceivedError", "(JILjava/lang/String;Ljava/lang/String;)V", reinterpret_cast<void *>(c_onReceivedError)},
+        {"c_processEventsFromQueue", "()V", reinterpret_cast<void *>(c_processEventsFromQueue)}
     };
 
     const int nMethods = sizeof(methods) / sizeof(methods[0]);