"Start Xvfb server and open xmessage window. Thread safe."
import threading
from easyprocess import EasyProcess
from pyvirtualdisplay.smartdisplay import SmartDisplay
def thread_function(index):
# manage_global_env=False is thread safe
with SmartDisplay(manage_global_env=False) as disp:
cmd = ["xmessage", str(index)]
# disp.new_display_var should be used for new processes
# disp.env() copies global os.environ and adds disp.new_display_var
with EasyProcess(cmd, env=disp.env()):
img = disp.waitgrab()
img.save("xmessage{}.png".format(index))
t1 = threading.Thread(target=thread_function, args=(1,))
t2 = threading.Thread(target=thread_function, args=(2,))
t1.start()
t2.start()
t1.join()
t2.join()
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