text: //========================================================================
  // GLFW 3.4 Win32 - www.glfw.org
  //------------------------------------------------------------------------
  // Copyright (c) 2002-2006 Marcus Geelnard
  // Copyright (c) 2006-2017 Camilla Löwy <elmindreda@glfw.org>
  //
  // 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.
  //
  //========================================================================
  // Please use C89 style variable declarations in this file because VS 2010
  //========================================================================
  
  #include "internal.h"
  
  #include <assert.h>
  
  
  //////////////////////////////////////////////////////////////////////////
  //////                       GLFW platform API                      //////
  //////////////////////////////////////////////////////////////////////////
  
  GLFWbool _glfwPlatformCreateTls(_GLFWtls* tls)
  {
      assert(tls->win32.allocated == GLFW_FALSE);
  
      tls->win32.index = TlsAlloc();
      if (tls->win32.index == TLS_OUT_OF_INDEXES)
      {
          _glfwInputError(GLFW_PLATFORM_ERROR, "Win32: Failed to allocate TLS index");
          return GLFW_FALSE;
      }
  
      tls->win32.allocated = GLFW_TRUE;
      return GLFW_TRUE;
  }
  
  void _glfwPlatformDestroyTls(_GLFWtls* tls)
  {
      if (tls->win32.allocated)
          TlsFree(tls->win32.index);
      memset(tls, 0, sizeof(_GLFWtls));
  }
  
  void* _glfwPlatformGetTls(_GLFWtls* tls)
  {
      assert(tls->win32.allocated == GLFW_TRUE);
      return TlsGetValue(tls->win32.index);
  }
  
  void _glfwPlatformSetTls(_GLFWtls* tls, void* value)
  {
      assert(tls->win32.allocated == GLFW_TRUE);
      TlsSetValue(tls->win32.index, value);
  }
  
  GLFWbool _glfwPlatformCreateMutex(_GLFWmutex* mutex)
  {
      assert(mutex->win32.allocated == GLFW_FALSE);
      InitializeCriticalSection(&mutex->win32.section);
      return mutex->win32.allocated = GLFW_TRUE;
  }
  
  void _glfwPlatformDestroyMutex(_GLFWmutex* mutex)
  {
      if (mutex->win32.allocated)
          DeleteCriticalSection(&mutex->win32.section);
      memset(mutex, 0, sizeof(_GLFWmutex));
  }
  
  void _glfwPlatformLockMutex(_GLFWmutex* mutex)
  {
      assert(mutex->win32.allocated == GLFW_TRUE);
      EnterCriticalSection(&mutex->win32.section);
  }
  
  void _glfwPlatformUnlockMutex(_GLFWmutex* mutex)
  {
      assert(mutex->win32.allocated == GLFW_TRUE);
      LeaveCriticalSection(&mutex->win32.section);
  }
  
  