Fix uses of undefined macro identifiers (-Wundef)

* Fix -Wundef warnings due to use of unguarded SDL_LOADSO_DISABLED

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_WINDOWS

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_ANDROID

* Fix -Wundef warnings due to use of unguarded SDL_LOADSO_DUMMY

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_COCOA

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_UIKIT

* Fix -Wundef warnings due to use of unguarded SDL_TIMERS_DISABLED

* Fix -Wundef warnings due to use of unguarded SDL_EVENTS_DISABLED

* Fix -Wundef warnings due to use of unguarded SDL_TIMER_DUMMY

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DISABLED

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DISABLED

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_DISABLED

* Fix -Wundef warnings due to use of unguarded SDL_HAPTIC_DISABLED

* Fix -Wundef warnings due to use of unguarded SDL_SENSOR_DISABLED

* Fix -Wundef warnings due to use of unguarded __ANDROID__

* Fix -Wundef warnings due to use of unguarded __IOS__

* Fix -Wundef warnings due to use of unguarded EMULATE_CAS

* Fix -Wundef warnings due to use of unguarded SDL_ATOMIC_DISABLED

* Fix -Wundef warnings due to use of unguarded SDL_THREADS_DISABLED

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_SNDIO

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_NETBSD

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_WASAPI

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_DSOUND

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_HAIKU

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_COREAUDIO

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_AAUDIO

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_OPENSLES

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_ANDROID

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_PS2

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_PSP

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_VITA

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_N3DS

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_EMSCRIPTEN

* Fix -Wundef warnings due to use of unguarded SDL_NEON_INTRINSICS

* Fix -Wundef warnings due to use of unguarded SDL_ALTIVEC_BLITTERS

* Fix -Wundef warnings due to use of unguarded __VITA__

* Fix -Wundef warnings due to use of unguarded __3DS__

* Fix -Wundef warnings due to use of unguarded SDL_DYNAPI_PROC_NO_VARARGS

* Fix -Wundef warnings due to use of unguarded __APPLE__

* Fix -Wundef warnings due to use of unguarded __WINRT__

* Fix -Wundef warnings due to use of unguarded SDL_HIDAPI_DISABLED

* Fix -Wundef warnings due to use of unguarded __TVOS__

* Fix -Wundef warnings due to use of unguarded HAVE_DRIVER_BACKEND

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_XINPUT

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_WGI

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_DINPUT

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_MFI

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_EMSCRIPTEN

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_PS2

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_PSP

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_VITA

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_N3DS

* Fix -Wundef warnings due to use of unguarded __MACOS__

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_RENDER_D3D

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_WINRT

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_RPI

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_VITA_PVR_OGL

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_VIVANTE

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_RENDER_D3D11

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_RENDER_D3D12

* Fix -Wundef warnings due to use of unguarded SDL_RENDER_DISABLED

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_RENDER_METAL

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_RENDER_PS2

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_RENDER_PSP

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_RENDER_VITA_GXM

* Fix -Wundef warnings due to use of unguarded SDL_ARM_SIMD_BLITTERS

* Fix -Wundef warnings due to use of unguarded SDL_ARM_NEON_BLITTERS

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_HAIKU

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_PS2

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_PSP

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_VITA

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_N3DS

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_KMSDRM

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_RISCOS

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_EMSCRIPTEN

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_NGAGE

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_METAL

* Fix -Wundef warnings due to use of unguarded SDL_LSX_INTRINSICS

* Fix -Wundef warnings due to use of unguarded HAVE_PTHREAD_NP_H

* Fix -Wundef warnings due to use of unguarded __RISCOS__

* Fix -Wundef warnings due to use of unguarded FAKE_RECURSIVE_MUTEX

* Fix -Wundef warnings due to use of unguarded USE_POSIX_SPAWN

* textureData is only needed when SDL is built with YUV support

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_ALSA

* Fix -Wundef warnings due to use of unguarded SDL_SSE3_INTRINSICS

* Fix -Wundef warnings due to use of unguarded SDL_SSE4_2_INTRINSICS

* Fix -Wundef warnings due to use of unguarded SDL_SSE4_1_INTRINSICS

* Fix -Wundef warnings due to use of unguarded SDL_AVX512F_INTRINSICS

* Fix -Wundef warnings due to use of unguarded SDL_SSE2_INTRINSICS

* Fix -Wundef warnings due to use of unguarded SDL_AVX_INTRINSICS

* Fix -Wundef warnings due to use of unguarded SDL_AVX2_INTRINSICS

* Fix -Wundef warnings due to use of unguarded SDL_SSE_INTRINSICS

* Fix -Wundef warnings due to use of unguarded SDL_MMX_INTRINSICS

* Fix -Wundef warnings due to use of unguarded HAVE_CLOCK_GETTIME

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_DISK

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_DUMMY

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_DUMMY

* Fix -Wundef warnings due to use of unguarded HAVE_GCC_ATOMICS

* Fix -Wundef warnings due to use of unguarded HAVE_GCC_SYNC_LOCK_TEST_AND_SET

* Fix -Wundef warnings due to use of unguarded SDL_USE_LIBDBUS

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_JACK

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_VIRTUAL

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_LINUX

* Fix -Wundef warnings due to use of unguarded HAVE_LIBC

* Fix -Wundef warnings due to disabling SDL_LIBC

* Fix -Wundef warnings due to use of unguarded HAVE_PLATFORM_BACKEND

* Fix -Wundef warnings due to use of unguarded DEBUG

* Fix -Wundef warnings due to use of unguarded HAVE_LINUX_INPUT_H

* Fix -Werror=unused-variable when building with SDL_LIBC=OFF

* Fix -Wundef warnings due to use of unguqrded SDL_USE_LIBUDEV

* Use SDL alloc functions in libusb/hid.c

* Fix -Wundef warnings due to use of unguarded HAVE_LIBUDEV_H

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_VULKAN

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_OFFSCREEN

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_RENDER_OGL

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_OPENGL

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_OPENGL_GLX

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_OPENGL_ES

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_OPENGL_ES2

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_RENDER_OGL_ES2

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_OSS

* Remove SDL_AUDIO_DRIVER_SUNAUDIO reference since it is never set

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_PIPEWIRE

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_PULSEAUDIO

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_X11_XCURSOR

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_X11_XDBE

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_X11_XFIXES

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_X11_XINPUT2

* Fix -Wundef warnings due to use of unguarded #if SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH

* Fix -Wundef warnings due to use of unguarded #if SDL_VIDEO_DRIVER_X11_XRANDR

* Fix -Wundef warnings due to use of unguarded #if SDL_VIDEO_DRIVER_X11_XSCRNSAVER

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_X11_XSHAPE

* Don't call XShape functions when XShape is diabled

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_WAYLAND

* Fix -Wundef warnings due to use of unuarded SDL_VIDEO_DRIVER_X11

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_RISCOS

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_OPENGL_EGL

* Disable array when compiled with SDL_EVENTS=OFF

* Fix -Wundef warnings due to use of unguarded SDL_INPUT_LINUXEV

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_PTHREAD

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_WINDOWS

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_PS2

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_PSP

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_VITA

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_N3DS

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_STDCPP

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_NGAGE

* Fix -Wundef warnings due to use of unguarded __WINDOWS__

* Fix -Wundef warnings due to use of unguarded __WINGDK__

* Fix -Wundef warnings due to use of unguarded __ANDROID__

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_GENERIC_COND_SUFFIX

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_VITA_PIB

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_VITA_PVR

* Fix -Wundef warnings due to use of unguarded SDL_FILE_DISABLED

* Fix -Wundef warnings due to use of unguarded __XBOXONE__

* Fix -Wundef warnings due to use of unguarded __XBOXSERIES__

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_OPENGL_WGL

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_QNX

* Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_DISK

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_QNX

* Fix -Wundef warnings due to use of unguarded DEBUG_RAZOR

* Fix -Wundef warnings due to use of unguarded WINAPI_FAMILY_PHONE_APP

* Fix -Wundef warnings due to use of unguarded SDL_MAC_NO_SANDBOX

* Fix -Wundef warnings due to use of unguarded __(IPHONE|APPLETV|MAC)_OS_VERSION_MAX_ALLOWED

* Fix C4090 warning ('function': different 'const' qualifiers)

* ci: use -isystem for include dirs of pspdev toolchain

* cmake: add -Wundef option

* Fix remaining -Wundef warnings due to use of unguarded SDL_VIDEO_VULKAN and SDL_VIDEO_METAL

* Fix -Wundef warnings due to use of unguarded __MACOS__

* DEBUG_CONVERT is guaranteed to be defined in src/audio/SDL_audiocvt.c

* Fix -Wundef warnings due to use of unguarded HAVE_NANOSLEEP

* Fix -Wundef warnings due to use of unguarded HAVE_DXGI_H

* Fix -Wundef warnings due to use of unguarded HAVE_LINUX_INPUT_H

* fix SDL_VIDEO_DRIVER_WAYLAND

* fix SDL_VIDEO_DRIVER_X11

* Fix -Wundef warnings due to use of unguarded HAVE_MMDEVICEAPI_H

* Fix -Wundef warnings due to use of unguarded HAVE_PTHREAD_SETNAME_NP

* Fix -Wundef warnings due to use of unguarded HAVE_PTHREAD_SET_NAME_NP

* Fix -Wundef warnings due to use of unguarded HAVE_SETJMP

* Fix -Wundef warnings due to use of unguarded HAVE_SIGNAL_H

* Fix -Wundef warnings due to use of unguarded HAVE_TPCSHRD_H

* Fix -Wundef warnings due to use of unguarded MACOSX_COREAUDIO

* Fix -Wundef warnings due to use of unguarded SDL_HAPTIC_DINPUT

* Fix -Wundef warnings due to use of unguarded SDL_HAPTIC_IOKIT

* Fix -Wundef warnings due to use of unguarded SDL_HAPTIC_XINPUT

* Fix -Wundef warnings due to use of unguarded SDL_IPHONE_KEYBOARD

* Fix -Wundef warnings due to use of unguarded SDL_JOYSTICK_RAWINPUT

* Fix -Wundef warnings due to use of unguarded SDL_POWER_ANDROID

* Fix -Wundef warnings due to use of unguarded SDL_POWER_EMSCRIPTEN

* Fix -Wundef warnings due to use of unguarded SDL_POWER_HAIKU

* Fix -Wundef warnings due to use of unguarded SDL_POWER_LINUX

* Fix -Wundef warnings due to use of unguarded SDL_POWER_MACOSX

* Fix -Wundef warnings due to use of unguarded SDL_POWER_PSP

* Fix -Wundef warnings due to use of unguarded SDL_POWER_UIKIT

* Fix -Wundef warnings due to use of unguarded SDL_POWER_VITA

* Fix -Wundef warnings due to use of unguarded SDL_POWER_WINDOWS

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_PTHREAD_RECURSIVE_MUTEX

* Fix -Wundef warnings due to use of unguarded SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_VIVANTE_VDK

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_WAYLAND

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_X11_HAS_XKBKEYCODETOKEYSYM

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_DRIVER_X11_SUPPORTS_GENERIC_EVENTS

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_OPENGL_CGL

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_OPENGL_EGL

* Fix -Wundef warnings due to use of unguarded __MACOS__

* Fix -Wundef warnings due to use of unguarded __OpenBSD__

* Fix -Wundef warnings due to use of unguarded __FreeBSD__

* Fix -Wundef warnings due to use of unguarded __MWERKS__

* Fix -Wundef warnings due to use of unguarded __WIN32__

* Fix -Wundef warnings due to use of unguarded SDL_IPHONE_LAUNCHSCREEN

* Fix -Wundef warnings due to use of unguarded SDL_VIDEO_OPENGL_ES2

* Remove unused HAVE_CONST, HAVE_INLINE and HAVE_VOLATILE

* Revert "Use SDL alloc functions in libusb/hid.c"

This reverts commit 847c64b00d.

* Handle FAKE_RECURSIVE_MUTEX in similar way as SDL2

* Don't use defined in macro

src/thread/pthread/SDL_sysmutex.c

@@ -23,15 +23,16 @@
 #include <errno.h>
 #include <pthread.h>
 
-#if !SDL_THREAD_PTHREAD_RECURSIVE_MUTEX && \
-    !SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
-#define FAKE_RECURSIVE_MUTEX 1
+
+#if !(defined(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX) || \
+    defined(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP))
+#define FAKE_RECURSIVE_MUTEX
 #endif
 
 struct SDL_mutex
 {
     pthread_mutex_t id;
-#if FAKE_RECURSIVE_MUTEX
+#ifdef FAKE_RECURSIVE_MUTEX
     int recursive;
     pthread_t owner;
 #endif
@@ -47,9 +48,9 @@ SDL_CreateMutex(void)
     mutex = (SDL_mutex *)SDL_calloc(1, sizeof(*mutex));
     if (mutex) {
         pthread_mutexattr_init(&attr);
-#if SDL_THREAD_PTHREAD_RECURSIVE_MUTEX
+#if defined(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX)
         pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
-#elif SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP
+#elif defined(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP)
         pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
 #else
         /* No extra attributes necessary */
@@ -76,7 +77,7 @@ void SDL_DestroyMutex(SDL_mutex *mutex)
 /* Lock the mutex */
 int SDL_LockMutex(SDL_mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
 {
-#if FAKE_RECURSIVE_MUTEX
+#ifdef FAKE_RECURSIVE_MUTEX
     pthread_t this_thread;
 #endif
 
@@ -84,7 +85,7 @@ int SDL_LockMutex(SDL_mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn
         return 0;
     }
 
-#if FAKE_RECURSIVE_MUTEX
+#ifdef FAKE_RECURSIVE_MUTEX
     this_thread = pthread_self();
     if (mutex->owner == this_thread) {
         ++mutex->recursive;
@@ -112,7 +113,7 @@ int SDL_TryLockMutex(SDL_mutex *mutex)
 {
     int retval;
     int result;
-#if FAKE_RECURSIVE_MUTEX
+#ifdef FAKE_RECURSIVE_MUTEX
     pthread_t this_thread;
 #endif
 
@@ -121,7 +122,7 @@ int SDL_TryLockMutex(SDL_mutex *mutex)
     }
 
     retval = 0;
-#if FAKE_RECURSIVE_MUTEX
+#ifdef FAKE_RECURSIVE_MUTEX
     this_thread = pthread_self();
     if (mutex->owner == this_thread) {
         ++mutex->recursive;
@@ -159,7 +160,7 @@ int SDL_UnlockMutex(SDL_mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doe
         return 0;
     }
 
-#if FAKE_RECURSIVE_MUTEX
+#ifdef FAKE_RECURSIVE_MUTEX
     /* We can only unlock the mutex if we own it */
     if (pthread_self() == mutex->owner) {
         if (mutex->recursive) {

src/thread/pthread/SDL_systhread.c

@@ -22,7 +22,7 @@
 
 #include <pthread.h>
 
-#if HAVE_PTHREAD_NP_H
+#ifdef HAVE_PTHREAD_NP_H
 #include <pthread_np.h>
 #endif
 
@@ -132,7 +132,7 @@ void SDL_SYS_SetupThread(const char *name)
             }
 #endif
         }
-#elif HAVE_PTHREAD_SETNAME_NP
+#elif defined(HAVE_PTHREAD_SETNAME_NP)
 #if defined(__NETBSD__)
         pthread_setname_np(pthread_self(), "%s", name);
 #else
@@ -142,7 +142,7 @@ void SDL_SYS_SetupThread(const char *name)
             pthread_setname_np(pthread_self(), namebuf);
         }
 #endif
-#elif HAVE_PTHREAD_SET_NAME_NP
+#elif defined(HAVE_PTHREAD_SET_NAME_NP)
         pthread_set_name_np(pthread_self(), name);
 #elif defined(__HAIKU__)
         /* The docs say the thread name can't be longer than B_OS_NAME_LENGTH. */
@@ -176,7 +176,7 @@ SDL_ThreadID(void)
 
 int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
 {
-#if __RISCOS__
+#if defined(__RISCOS__)
     /* FIXME: Setting thread priority does not seem to be supported */
     return 0;
 #else
@@ -234,7 +234,7 @@ int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
         policy = pri_policy;
     }
 
-#if __LINUX__
+#ifdef __LINUX__
     {
         pid_t linuxTid = syscall(SYS_gettid);
         return SDL_LinuxSetThreadPriorityAndPolicy(linuxTid, priority, policy);