Create class for shared memory blocks [wip]

2 files changed, 106 insertions, 0 deletions

diff --git a/core/os/shared_mem_access.cpp b/core/os/shared_mem_access.cpp
new file mode 100644
index 0000000000..a953206cda
--- /dev/null
+++ b/core/os/shared_mem_access.cpp
@@ -0,0 +1,45 @@
+/*************************************************************************/
+/*  shared_mem_access.cpp                                                */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* 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 "shared_mem_access.h"
+
+#include "core/error_macros.h"
+
+SharedMemAccess *(*SharedMemAccess::create_func)(const String &p_name) = 0;
+
+SharedMemAccess *SharedMemAccess::create(const String &p_name) {
+
+	ERR_FAIL_COND_V(!create_func, 0);
+
+	return create_func(p_name);
+}
+
+SharedMemAccess::~SharedMemAccess() {
+}
diff --git a/core/os/shared_mem_access.h b/core/os/shared_mem_access.h
new file mode 100644
index 0000000000..051b94f823
--- /dev/null
+++ b/core/os/shared_mem_access.h
@@ -0,0 +1,61 @@
+/*************************************************************************/
+/*  shared_mem_access.h                                                  */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* 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.                */
+/*************************************************************************/
+
+#ifndef SHARED_MEM_ACCESS
+#define SHARED_MEM_ACCESS
+
+#include "core/error_list.h"
+#include "core/int_types.h"
+
+class String;
+
+class SharedMemAccess {
+
+protected:
+	static SharedMemAccess *(*create_func)(const String &p_name);
+
+public:
+	static SharedMemAccess *create(const String &p_name);
+
+	virtual Error open() = 0;
+	virtual Error close() = 0;
+	virtual bool is_open() = 0;
+
+	virtual void *lock() = 0;
+	virtual void unlock() = 0;
+	virtual bool is_locking() = 0;
+
+	virtual void *set_size(uint64_t p_size) = 0;
+	virtual uint64_t get_size() = 0;
+
+	virtual ~SharedMemAccess();
+};
+
+#endif