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diff --git a/tests/glx/glx-multithread-shader-compile.c b/tests/glx/glx-multithread-shader-compile.c
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+/*
+ * Copyright (c) 2012 Mathias Fröhlich
+ *
+ * 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 (including the next
+ * paragraph) 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.
+ */
+
+/**
+ * @file glx-multithread-shader-compile.c
+ * @author Mathias Fröhlich
+ *
+ * Create two GLX contexts and concurrently compile shaders.
+ * Exercises a race conditon with the r600 llvm compiler.
+ */
+
+#include "piglit-util-gl-common.h"
+#include "piglit-glx-util.h"
+#include "pthread.h"
+
+static const char *vert_shader_text =
+ "void main() \n"
+ "{ \n"
+ " gl_Position = ftransform(); \n"
+ " gl_FrontColor = gl_Color; \n"
+ "} \n";
+
+static const char *frag_shader_text =
+ "void main() \n"
+ "{ \n"
+ " gl_FragColor = vec4(1.0) - gl_Color; \n"
+ "} \n";
+
+static pthread_mutex_t mutex;
+
+static void *
+thread_func(void *arg)
+{
+ Display *dpy;
+ XVisualInfo *visinfo;
+ Window win;
+ unsigned i;
+
+ dpy = piglit_get_glx_display();
+ visinfo = piglit_get_glx_visual(dpy);
+ win = piglit_get_glx_window(dpy, visinfo);
+
+ for (i = 0; i < 100; ++i) {
+ GLXContext ctx;
+ GLuint vert_shader, frag_shader;
+ GLuint program;
+
+ ctx = piglit_get_glx_context(dpy, visinfo);
+ glXMakeCurrent(dpy, win, ctx);
+
+ /* Ok, not nice but should be safe due to all threads working
+ * on the same type of context.
+ */
+ pthread_mutex_lock(&mutex);
+ piglit_dispatch_default_init();
+ pthread_mutex_unlock(&mutex);
+
+ vert_shader = piglit_compile_shader_text(GL_VERTEX_SHADER, vert_shader_text);
+ piglit_check_gl_error(GL_NO_ERROR);
+
+ frag_shader = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag_shader_text);
+ piglit_check_gl_error(GL_NO_ERROR);
+
+ program = piglit_link_simple_program(vert_shader, frag_shader);
+ piglit_check_gl_error(GL_NO_ERROR);
+
+ glUseProgram(program);
+ piglit_check_gl_error(GL_NO_ERROR);
+
+ glXDestroyContext(dpy, ctx);
+ }
+
+ return NULL;
+}
+
+int
+main(int argc, char **argv)
+{
+ int ret;
+ pthread_t thread1, thread2;
+
+ pthread_mutex_init(&mutex, NULL);
+
+ /* Now, spawn some threads that compile simple shaders.
+ */
+ pthread_create(&thread1, NULL, thread_func, NULL);
+ pthread_create(&thread2, NULL, thread_func, NULL);
+
+ ret = pthread_join(thread1, NULL);
+ assert(ret == 0);
+ ret = pthread_join(thread2, NULL);
+ assert(ret == 0);
+
+ pthread_mutex_destroy(&mutex);
+
+ piglit_report_result(PIGLIT_PASS);
+ return 0;
+}