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Replaced __declspec(thread) with TlsAlloc.

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Variables created within a DLL with __declspec(thread) may not get a TLS
slot on Windows XP, leading to segfaults on use.  Moving to TlsAlloc
works around this.
This commit is contained in:
Camilla Berglund 2013-04-08 03:48:39 +02:00
parent e248fb6056
commit cd2b6eb83c
2 changed files with 18 additions and 21 deletions
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36
src/wgl_context.c
View File

@ -35,22 +35,6 @@
#include <assert.h> #include <assert.h>
// Thread local storage attribute macro
//
#if defined(_MSC_VER)
#define _GLFW_TLS __declspec(thread)
#elif defined(__GNUC__)
#define _GLFW_TLS __thread
#else
#define _GLFW_TLS
#endif
// The per-thread current context/window pointer
//
static _GLFW_TLS _GLFWwindow* _glfwCurrentWindow = NULL;
// Initialize WGL-specific extensions // Initialize WGL-specific extensions
// This function is called once before initial context creation, i.e. before // This function is called once before initial context creation, i.e. before
// any WGL extensions could be present. This is done in order to have both // any WGL extensions could be present. This is done in order to have both
@ -149,6 +133,16 @@ static void initWGLExtensions(_GLFWwindow* window)
// //
int _glfwInitContextAPI(void) int _glfwInitContextAPI(void)
{ {
_glfw.wgl.tls = TlsAlloc();
if (_glfw.wgl.tls == TLS_OUT_OF_INDEXES)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"WGL: Failed to allocate TLS index");
return GL_FALSE;
}
_glfw.wgl.hasTLS = GL_TRUE;
return GL_TRUE; return GL_TRUE;
} }
@ -156,6 +150,8 @@ int _glfwInitContextAPI(void)
// //
void _glfwTerminateContextAPI(void) void _glfwTerminateContextAPI(void)
{ {
if (_glfw.wgl.hasTLS)
TlsFree(_glfw.wgl.tls);
} }
#define setWGLattrib(attribName, attribValue) \ #define setWGLattrib(attribName, attribValue) \
@ -516,12 +512,12 @@ void _glfwPlatformMakeContextCurrent(_GLFWwindow* window)
else else
wglMakeCurrent(NULL, NULL); wglMakeCurrent(NULL, NULL);
_glfwCurrentWindow = window; TlsSetValue(_glfw.wgl.tls, window);
} }
_GLFWwindow* _glfwPlatformGetCurrentContext(void) _GLFWwindow* _glfwPlatformGetCurrentContext(void)
{ {
return _glfwCurrentWindow; return TlsGetValue(_glfw.wgl.tls);
} }
void _glfwPlatformSwapBuffers(_GLFWwindow* window) void _glfwPlatformSwapBuffers(_GLFWwindow* window)
@ -531,7 +527,7 @@ void _glfwPlatformSwapBuffers(_GLFWwindow* window)
void _glfwPlatformSwapInterval(int interval) void _glfwPlatformSwapInterval(int interval)
{ {
_GLFWwindow* window = _glfwCurrentWindow; _GLFWwindow* window = _glfwPlatformGetCurrentContext();
if (_glfwIsCompositionEnabled()) if (_glfwIsCompositionEnabled())
{ {
@ -548,7 +544,7 @@ int _glfwPlatformExtensionSupported(const char* extension)
{ {
const GLubyte* extensions; const GLubyte* extensions;
_GLFWwindow* window = _glfwCurrentWindow; _GLFWwindow* window = _glfwPlatformGetCurrentContext();
if (window->wgl.GetExtensionsStringEXT != NULL) if (window->wgl.GetExtensionsStringEXT != NULL)
{ {

3
src/wgl_platform.h
View File

@ -76,7 +76,8 @@ typedef struct _GLFWcontextWGL
//------------------------------------------------------------------------ //------------------------------------------------------------------------
typedef struct _GLFWlibraryWGL typedef struct _GLFWlibraryWGL
{ {
int dummy; GLboolean hasTLS;
DWORD tls;
} _GLFWlibraryWGL; } _GLFWlibraryWGL;