Split out TLS code into separate modules.

This allows the TLS code to be re-used by partial ports like EGL.

src/posix_tls.c

@@ -0,0 +1,66 @@
+//========================================================================
+// GLFW 3.1 POSIX - www.glfw.org
+//------------------------------------------------------------------------
+// Copyright (c) 2002-2006 Marcus Geelnard
+// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.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.
+//
+//========================================================================
+
+#include "internal.h"
+
+
+//////////////////////////////////////////////////////////////////////////
+//////                       GLFW internal API                      //////
+//////////////////////////////////////////////////////////////////////////
+
+int _glfwInitTLS(void)
+{
+    if (pthread_key_create(&_glfw.posix_tls.context, NULL) != 0)
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR,
+                        "POSIX: Failed to create context TLS");
+        return GL_FALSE;
+    }
+
+    return GL_TRUE;
+}
+
+void _glfwTerminateTLS(void)
+{
+    pthread_key_delete(_glfw.posix_tls.context);
+}
+
+void _glfwSetCurrentContext(_GLFWwindow* context)
+{
+    pthread_setspecific(_glfw.posix_tls.context, context);
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+//////                       GLFW platform API                      //////
+//////////////////////////////////////////////////////////////////////////
+
+_GLFWwindow* _glfwPlatformGetCurrentContext(void)
+{
+    return pthread_getspecific(_glfw.posix_tls.context);
+}
+