Drop old semaphore implementation

- Removed platform-specific implementations.
- Now all semaphores are in-object, unless they need to be conditionally created.
- Similarly to `Mutex`, provided a dummy implementation for when `NO_THREADS` is defined.
- Similarly to `Mutex`, methods are made `const` for easy use in such contexts.
- Language bindings updated: `wait()` and `post()` are now `void`.
- Language bindings updated: `try_wait()` added.

Bonus:
- Rewritten the `#ifdef` in `mutex.h` to meet the code style.

5 files changed, 0 insertions, 306 deletions

diff --git a/drivers/unix/os_unix.cpp b/drivers/unix/os_unix.cpp
index 1d94b9618d..f7da18a7f9 100644
--- a/drivers/unix/os_unix.cpp
+++ b/drivers/unix/os_unix.cpp
@@ -38,7 +38,6 @@
 #include "drivers/unix/file_access_unix.h"
 #include "drivers/unix/net_socket_posix.h"
 #include "drivers/unix/rw_lock_posix.h"
-#include "drivers/unix/semaphore_posix.h"
 #include "drivers/unix/thread_posix.h"
 #include "servers/visual_server.h"
 
@@ -121,13 +120,9 @@ void OS_Unix::initialize_core() {
 
 #ifdef NO_THREADS
 	ThreadDummy::make_default();
-	SemaphoreDummy::make_default();
 	RWLockDummy::make_default();
 #else
 	ThreadPosix::make_default();
-#if !defined(OSX_ENABLED) && !defined(IPHONE_ENABLED)
-	SemaphorePosix::make_default();
-#endif
 	RWLockPosix::make_default();
 #endif
 	FileAccess::make_default<FileAccessUnix>(FileAccess::ACCESS_RESOURCES);
diff --git a/drivers/unix/semaphore_posix.cpp b/drivers/unix/semaphore_posix.cpp
deleted file mode 100644
index b532b09cd6..0000000000
--- a/drivers/unix/semaphore_posix.cpp
+++ /dev/null
@@ -1,87 +0,0 @@
-/*************************************************************************/
-/*  semaphore_posix.cpp                                                  */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2020 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 "semaphore_posix.h"
-
-#if (defined(UNIX_ENABLED) || defined(PTHREAD_ENABLED)) && !defined(OSX_ENABLED) && !defined(IPHONE_ENABLED)
-
-#include "core/os/memory.h"
-#include <errno.h>
-#include <stdio.h>
-
-Error SemaphorePosix::wait() {
-
-	while (sem_wait(&sem)) {
-		if (errno == EINTR) {
-			errno = 0;
-			continue;
-		} else {
-			perror("sem waiting");
-			return ERR_BUSY;
-		}
-	}
-	return OK;
-}
-
-Error SemaphorePosix::post() {
-
-	return (sem_post(&sem) == 0) ? OK : ERR_BUSY;
-}
-int SemaphorePosix::get() const {
-
-	int val;
-	sem_getvalue(&sem, &val);
-
-	return val;
-}
-
-SemaphoreOld *SemaphorePosix::create_semaphore_posix() {
-
-	return memnew(SemaphorePosix);
-}
-
-void SemaphorePosix::make_default() {
-
-	create_func = create_semaphore_posix;
-}
-
-SemaphorePosix::SemaphorePosix() {
-
-	int r = sem_init(&sem, 0, 0);
-	if (r != 0)
-		perror("sem creating");
-}
-
-SemaphorePosix::~SemaphorePosix() {
-
-	sem_destroy(&sem);
-}
-
-#endif
diff --git a/drivers/unix/semaphore_posix.h b/drivers/unix/semaphore_posix.h
deleted file mode 100644
index 2bffe6933d..0000000000
--- a/drivers/unix/semaphore_posix.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/*************************************************************************/
-/*  semaphore_posix.h                                                    */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2020 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 SEMAPHORE_POSIX_H
-#define SEMAPHORE_POSIX_H
-
-#include "core/os/semaphore.h"
-
-#if (defined(UNIX_ENABLED) || defined(PTHREAD_ENABLED)) && !defined(OSX_ENABLED) && !defined(IPHONE_ENABLED)
-
-#include <semaphore.h>
-
-class SemaphorePosix : public SemaphoreOld {
-
-	mutable sem_t sem;
-
-	static SemaphoreOld *create_semaphore_posix();
-
-public:
-	virtual Error wait();
-	virtual Error post();
-	virtual int get() const;
-
-	static void make_default();
-	SemaphorePosix();
-
-	~SemaphorePosix();
-};
-
-#endif
-#endif
diff --git a/drivers/windows/semaphore_windows.cpp b/drivers/windows/semaphore_windows.cpp
deleted file mode 100644
index 1b53e311ff..0000000000
--- a/drivers/windows/semaphore_windows.cpp
+++ /dev/null
@@ -1,98 +0,0 @@
-/*************************************************************************/
-/*  semaphore_windows.cpp                                                */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2020 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 "semaphore_windows.h"
-
-#if defined(WINDOWS_ENABLED)
-
-#include "core/os/memory.h"
-
-Error SemaphoreWindows::wait() {
-
-	WaitForSingleObjectEx(semaphore, INFINITE, false);
-	return OK;
-}
-Error SemaphoreWindows::post() {
-
-	ReleaseSemaphore(semaphore, 1, NULL);
-	return OK;
-}
-int SemaphoreWindows::get() const {
-	long previous;
-	switch (WaitForSingleObjectEx(semaphore, 0, false)) {
-		case WAIT_OBJECT_0: {
-			ERR_FAIL_COND_V(!ReleaseSemaphore(semaphore, 1, &previous), -1);
-			return previous + 1;
-		} break;
-		case WAIT_TIMEOUT: {
-			return 0;
-		} break;
-		default: {
-		}
-	}
-
-	ERR_FAIL_V(-1);
-}
-
-SemaphoreOld *SemaphoreWindows::create_semaphore_windows() {
-
-	return memnew(SemaphoreWindows);
-}
-
-void SemaphoreWindows::make_default() {
-
-	create_func = create_semaphore_windows;
-}
-
-SemaphoreWindows::SemaphoreWindows() {
-
-#ifdef UWP_ENABLED
-	semaphore = CreateSemaphoreEx(
-			NULL,
-			0,
-			0xFFFFFFF, //wathever
-			NULL,
-			0,
-			SEMAPHORE_ALL_ACCESS);
-#else
-	semaphore = CreateSemaphore(
-			NULL,
-			0,
-			0xFFFFFFF, //wathever
-			NULL);
-#endif
-}
-
-SemaphoreWindows::~SemaphoreWindows() {
-
-	CloseHandle(semaphore);
-}
-
-#endif
diff --git a/drivers/windows/semaphore_windows.h b/drivers/windows/semaphore_windows.h
deleted file mode 100644
index 159e8b3b96..0000000000
--- a/drivers/windows/semaphore_windows.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/*************************************************************************/
-/*  semaphore_windows.h                                                  */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2020 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 SEMAPHORE_WINDOWS_H
-#define SEMAPHORE_WINDOWS_H
-
-#include "core/os/semaphore.h"
-
-#ifdef WINDOWS_ENABLED
-
-#include <windows.h>
-
-class SemaphoreWindows : public SemaphoreOld {
-
-	mutable HANDLE semaphore;
-
-	static SemaphoreOld *create_semaphore_windows();
-
-public:
-	virtual Error wait();
-	virtual Error post();
-	virtual int get() const;
-
-	static void make_default();
-	SemaphoreWindows();
-
-	~SemaphoreWindows();
-};
-
-#endif
-#endif