godot/drivers/windows/semaphore_windows.cpp

/*************************************************************************/
/*  semaphore_windows.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 "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);
}

Semaphore *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