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[633/906] display: fail properly in context creation in order to minimize a race condition

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previously, on context creation, when we failed to get a valid context
we would still atempt to run the window mainloop as well as setting an error
on the display. This would cause the calling element to finalize the display
and therefore attempt to quit the window mainloop.  However the mainloop
may not have started running.  Thus when the window mainloop ran it would
never a get a quit message and never end.
This commit is contained in:
Matthew Waters 2012-12-19 14:32:20 +11:00
parent 6aa6212419
commit 757618a986
1 changed files with 20 additions and 6 deletions
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26
gst-libs/gst/gl/gstgldisplay.c
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@ -402,7 +402,7 @@ _create_context_opengl (GstGLDisplay * display, gint * gl_major, gint * gl_minor
GST_INFO ("GL_SHADING_LANGUAGE_VERSION: %s", GST_INFO ("GL_SHADING_LANGUAGE_VERSION: %s",
glGetString (GL_SHADING_LANGUAGE_VERSION)); glGetString (GL_SHADING_LANGUAGE_VERSION));
else else
GST_INFO ("Your driver does not support GLSL (OpenGL Shading Language)"); GST_WARNING ("Your driver does not support GLSL (OpenGL Shading Language)");
if (glGetString (GL_VENDOR)) if (glGetString (GL_VENDOR))
GST_INFO ("GL_VENDOR: %s", glGetString (GL_VENDOR)); GST_INFO ("GL_VENDOR: %s", glGetString (GL_VENDOR));
@ -478,9 +478,7 @@ gst_gl_display_thread_create_context (GstGLDisplay * display)
if (!display->gl_window || error) { if (!display->gl_window || error) {
gst_gl_display_set_error (display, error ? error->message : "Failed to create gl window"); gst_gl_display_set_error (display, error ? error->message : "Failed to create gl window");
g_cond_signal (display->cond_create_context); goto failure;
gst_gl_display_unlock (display);
return NULL;
} }
GST_INFO ("gl window created"); GST_INFO ("gl window created");
@ -494,10 +492,12 @@ gst_gl_display_thread_create_context (GstGLDisplay * display)
compiled_api_s = gst_gl_api_string (compiled_api); compiled_api_s = gst_gl_api_string (compiled_api);
GST_INFO ("compiled api support: %s", compiled_api_s); GST_INFO ("compiled api support: %s", compiled_api_s);
if ((compiled_api & display->gl_api) == GST_GL_API_NONE) if ((compiled_api & display->gl_api) == GST_GL_API_NONE) {
gst_gl_display_set_error (display, "failed to create_context, window " gst_gl_display_set_error (display, "failed to create_context, window "
"could not provide correct api. compiled api supports:%s, window " "could not provide correct api. compiled api supports:%s, window "
"supports:%s", compiled_api_s, api_string); "supports:%s", compiled_api_s, api_string);
goto failure;
}
g_free (api_string); g_free (api_string);
g_free (compiled_api_s); g_free (compiled_api_s);
@ -512,8 +512,10 @@ gst_gl_display_thread_create_context (GstGLDisplay * display)
ret = _create_context_gles2 (display, &gl_major, &gl_minor); ret = _create_context_gles2 (display, &gl_major, &gl_minor);
#endif #endif
if (!ret || !gl_major) if (!ret || !gl_major) {
gst_gl_display_set_error (display, "failed to create context, unknown reason"); gst_gl_display_set_error (display, "failed to create context, unknown reason");
goto failure;
}
/* setup callbacks */ /* setup callbacks */
gst_gl_window_set_resize_callback (display->gl_window, gst_gl_window_set_resize_callback (display->gl_window,
@ -544,6 +546,18 @@ gst_gl_display_thread_create_context (GstGLDisplay * display)
gst_gl_display_unlock (display); gst_gl_display_unlock (display);
return NULL; return NULL;
failure:
{
if (display->gl_window) {
g_object_unref (display->gl_window);
display->gl_window = NULL;
}
g_cond_signal (display->cond_create_context);
gst_gl_display_unlock (display);
return NULL;
}
} }