arm: use TinyCThread as fallback if C11 <threads.h> is not available.

Author: adriweb

LICENSE

@@ -18,6 +18,8 @@ Portions of this program use code, directly or modified, from:
 
 CEmu also uses the APNG-enabled fork of libpng (https://sourceforge.net/projects/libpng-apng/) released under the zlib/libpng License.
 
+If the C11 <threads.h> is not available, CEmu uses gyrovorbis' TinyCThread fork (https://github.com/gyrovorbis/tinycthread) released under the zlib License.
+
 ________________________________________________________
 z80e license:
 
@@ -59,3 +61,30 @@ KDMacTouchBar license:
 GNU LESSER GENERAL PUBLIC LICENSE Version 3
 See here: https://github.com/KDAB/KDMacTouchBar/blob/master/LICENSE.LGPL.txt
 
+
+________________________________________________________
+TinyCThread license:
+
+Copyright (c) 2012 Marcus Geelnard
+Copyright (c) 2013-2016 Evan Nemerson
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+
+SPDX-License-Identifier: Zlib

README.md

@@ -84,5 +84,5 @@ We also welcome more translations. Qt Linguist is a great tool for that (here's
 
 ## License
 CEmu is licensed under the [GPLv3](LICENSE).  
-_Acknowledgements_: Some CEmu parts are, directly, modified, or inspired, from [z80e](https://github.com/KnightOS/z80e), [Firebird](https://github.com/nspire-emus/firebird), [libtifiles](https://github.com/debrouxl/tilibs), [tivars_lib_cpp](https://github.com/adriweb/tivars_lib_cpp), [KDMacTouchBar](https://github.com/KDAB/KDMacTouchBar), and FatCow's ["Farm-Fresh Web Icons"](http://www.fatcow.com/free-icons).  
+_Acknowledgements_: Some CEmu parts are, directly, modified, or inspired, from [z80e](https://github.com/KnightOS/z80e), [Firebird](https://github.com/nspire-emus/firebird), [libtifiles](https://github.com/debrouxl/tilibs), [tivars_lib_cpp](https://github.com/adriweb/tivars_lib_cpp), [KDMacTouchBar](https://github.com/KDAB/KDMacTouchBar), [TinyCThread](https://github.com/gyrovorbis/tinycthread) (_gyrovorbis_'s fork), and FatCow's ["Farm-Fresh Web Icons"](http://www.fatcow.com/free-icons).  
 The complete licensing information is available in the [LICENSE](LICENSE) file.

core/arm/armmem.h

@@ -12,7 +12,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
-#include <threads.h>
+#include "threading.h"
 
 typedef struct {
     __IO PM_CTRL_Type               CTRL;        /**< \brief Offset: 0x00 (R/W  8) Control */

core/arm/armstate.h

@@ -8,7 +8,7 @@
 #include "sync.h"
 
 #include <stdbool.h>
-#include <threads.h>
+#include "threading.h"
 
 struct arm {
     sync_t sync;

core/arm/spscqueue.h

@@ -4,7 +4,7 @@
 #include <stdatomic.h>
 #include <stdbool.h>
 #include <stdint.h>
-#include <threads.h>
+#include "threading.h"
 
 #ifdef __cplusplus
 extern "C" {

core/arm/sync.h

@@ -3,7 +3,7 @@
 
 #include <stdatomic.h>
 #include <stdbool.h>
-#include <threads.h>
+#include "threading.h"
 
 #ifdef __cplusplus
 extern "C" {

core/arm/threading.h

@@ -0,0 +1,5 @@
+#ifdef HAVE_C11_THREADS
+#include <threads.h>
+#else
+#include "tinycthread.h"
+#endif