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backends/platform/libretro/include/libretro-threads.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef LIBRETRO_THREADS_H
+#define LIBRETRO_THREADS_H
+
+/* ScummVM doesn't have a top-level main loop that we can use, so instead we run it in its own thread
+ * and switch between it and the main thread. Calling these function will block the current thread
+ * and unblock the other. Each function should be called from the other thread.
+ */
+void retro_switch_to_emu_thread(void);
+void retro_switch_to_main_thread(void);
+
+/* Initialize the emulation thread and any related resources.
+ *
+ * This function should be called from the main thread.
+ */
+bool retro_init_emu_thread(void);
+
+/* Destroy the emulation thread and any related resources. Only call this after the emulation thread
+ * has finished (or canceled) and joined.
+ *
+ * This function should be called from the main thread.
+ */
+void retro_deinit_emu_thread(void);
+
+/* Returns true if the emulation thread was initialized successfully.
+ *
+ * This function should be called from the main thread.
+ */
+bool retro_emu_thread_initialized(void);
+
+/* Returns true if the emulation thread has exited naturally.
+ *
+ * This function can be called from either the main or the emulation thread.
+ */
+bool retro_emu_thread_exited(void);
+
+/* Returns scummvm_main return code or -1 if not available */
+int retro_get_scummvm_res(void);
+
+/* Returns true if the emulation thread was started successfully.
+ *
+ * This function should be called from the main thread.
+ */
+bool retro_emu_thread_started(void);
+
+#endif
+