import os

# Unix-like with GTK systems use gstreamer as media backend.
# gstreamer leaves applications to invoke XInitThreads()
# in libX11, and the wxWidgets wxMediaCtrl crashes
# with X errors so frequently it is unusable if that
# initialization is not done.
# Fortunately, it can probably be done here, but perhaps
# success is not certain.  (Another hack is to use LD_PRELOAD
# if supported to load a tiny shared library that merely
# makes the call -- doing both that and this is probably OK.)
X11hack = None
if os.name == 'posix' and ('DISPLAY' in os.environ):
    # this env var has had no effect in my testing --
    # probably needs later version -- but leave it
    os.environ["GST_GL_XINITTHREADS"] = "1"

    import ctypes
    import ctypes.util
    X11hack = {
        "libname" : ctypes.util.find_library("X11") or "libX11.so",
        "lib_ptr" : None,
        "lib_fun" : None,
        "lib_ret" : None,
        "lib_err" : None
    }
    
    try:
        X11hack["lib_ptr"] = ctypes.cdll.LoadLibrary(X11hack["libname"])
        X11hack["lib_fun"] = X11hack["lib_ptr"].XInitThreads
        X11hack["lib_fun"].argtypes = []
        X11hack["lib_fun"].restype = ctypes.c_int # X11 'Status'
    
        try:
            X11hack["lib_ret"] = X11hack["lib_fun"]()
        except Exception as m:
            X11hack["lib_err"] = "Call Exception: {}".format(m)
        except:
            X11hack["lib_err"] = "Call Exception: unknown"

    except AttributeError:
        X11hack["lib_err"] = "AttributeError"
    except Exception as m:
        X11hack["lib_err"] = "Exception: {}".format(m)
    except:
        X11hack["lib_err"] = "Exception: unknown"

    if False and X11hack["lib_err"]:
        print("Cannot load {} : '{}'".format(
            X11hack["libname"], X11hack["lib_err"]))