modules/graphics/src/main/native-glass/gtk/GlassApplication.cpp

rev 9734 : 8087516: Conditional support for GTK 3 on Linux
Reviewed-by:

@@ -77,10 +77,69 @@
     (void)clazz;
 
     return is_display_valid();
 }
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+static void init_threads() {
+    gboolean is_g_thread_get_initialized = FALSE;
+    if (glib_check_version(2, 32, 0)) { // < 2.32
+        if (!glib_check_version(2, 20, 0)) {
+            is_g_thread_get_initialized = g_thread_get_initialized();
+        }
+        if (!is_g_thread_get_initialized) {
+            // Calling g_thread_init() multiple times leads to crash on GLib < 2.24
+            // We can use g_thread_get_initialized () but it is available only for
+            // GLib >= 2.20. We rely on GThreadHelper for GLib < 2.20.
+            // g_thread_init is no longer necessary for GLib >=2.32
+            g_thread_init(NULL);
+        }
+    }
+    gdk_threads_init();
+}
+#pragma GCC diagnostic pop
+
+
+/*
+ * Class:     com_sun_glass_ui_gtk_GtkApplication
+ * Method:    _setGTKversion
+ * Signature: (IZ)I
+ */
+JNIEXPORT jint JNICALL Java_com_sun_glass_ui_gtk_GtkApplication__1setGTKversion
+  (JNIEnv *env, jclass clazz, jint version, jboolean verbose)
+{
+    int ret = wrapper_load_symbols(version, verbose);
+
+    clazz = env->FindClass("sun/misc/GThreadHelper");
+    if (env->ExceptionCheck()) return JNI_ERR;
+    if (clazz) {
+        jmethodID mid_getAndSetInitializationNeededFlag = env->GetStaticMethodID(clazz, "getAndSetInitializationNeededFlag", "()Z");
+        if (env->ExceptionCheck()) return JNI_ERR;
+        jmethodID mid_lock = env->GetStaticMethodID(clazz, "lock", "()V");
+        if (env->ExceptionCheck()) return JNI_ERR;
+        jmethodID mid_unlock = env->GetStaticMethodID(clazz, "unlock", "()V");
+        if (env->ExceptionCheck()) return JNI_ERR;
+
+        env->CallStaticVoidMethod(clazz, mid_lock);
+
+        if (!env->CallStaticBooleanMethod(clazz, mid_getAndSetInitializationNeededFlag)) {
+            init_threads();
+        }
+
+        env->CallStaticVoidMethod(clazz, mid_unlock);
+    } else {
+        env->ExceptionClear();
+        init_threads();
+    }
+
+    gdk_threads_enter();
+    gtk_init(NULL, NULL);
+
+    return ret;
+}
+
 /*
  * Class:     com_sun_glass_ui_gtk_GtkApplication
  * Method:    _init
  * Signature: ()V
  */