initial commit, 4.5 stable

platform/android/thread_jandroid.cpp

@@ -0,0 +1,83 @@
+/**************************************************************************/
+/*  thread_jandroid.cpp                                                   */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#include "thread_jandroid.h"
+
+#include "core/os/thread.h"
+
+#include <android/log.h>
+
+static JavaVM *java_vm = nullptr;
+static thread_local JNIEnv *env = nullptr;
+
+// The logic here need to improve, init_thread/term_tread are designed to work with Thread::callback
+// Calling init_thread from setup_android_thread and get_jni_env to setup an env we're keeping and not detaching
+// could cause issues on app termination.
+//
+// We should be making sure that any thread started calls a nice cleanup function when it's done,
+// especially now that we use many more threads.
+
+static void init_thread() {
+	if (env) {
+		// thread never detached! just keep using...
+		return;
+	}
+
+	java_vm->AttachCurrentThread(&env, nullptr);
+}
+
+static void term_thread() {
+	java_vm->DetachCurrentThread();
+
+	// this is no longer valid, must called init_thread to re-establish
+	env = nullptr;
+}
+
+void init_thread_jandroid(JavaVM *p_jvm, JNIEnv *p_env) {
+	java_vm = p_jvm;
+	env = p_env;
+	Thread::_set_platform_functions({ .init = init_thread, .term = &term_thread });
+}
+
+void setup_android_thread() {
+	if (!env) {
+		// !BAS! see remarks above
+		init_thread();
+	}
+}
+
+JNIEnv *get_jni_env() {
+	if (!env) {
+		// !BAS! see remarks above
+		init_thread();
+	}
+
+	return env;
+}