python - running 2nd pygame program (for 2nd display) in 2nd SSH terminal pauses until ^C is pressed -

i have 2 displays on raspberry pi 2 running jessie: (default) hdmi display, , adafruit pitft lcd.

i can start pygame programs independently in 2 ssh terminals, 2 different displays, except 2nd 1 run pauses until hit ^c.

using ssh on mac, can run 'count-to-50' pygame program on either 1 fine. (the difference lcd version sets 2 env variables redirect pygame lcd screen.)

if open 2 ssh terminals, , try run both python programs, second program starts running if press control-c.

what need differently second program starts running without first having press control-c?

i'm not sure if "linux" device setup issue, "python" code issue?

here's 2 simple programs:

# count_on_lcd.py import pygame, time, os # on raspberry pi sends lcd screen os.environ['sdl_videodriver'] = 'fbcon' os.environ["sdl_fbdev"] = "/dev/fb1" pygame.init() screen = max(pygame.display.list_modes()) surface = pygame.display.set_mode(screen) surface.fill(pygame.color(0,0,0)) pygame.display.update() font_big = pygame.font.font(none, 150) in range(50):   print (i)   surface.fill(pygame.color(128,0,0))   text_surface = font_big.render('%s'%i, true, (255,255,255))   rect = text_surface.get_rect(center=(50,50))   surface.blit(text_surface, rect)   pygame.display.update()   time.sleep(1)   surface.fill(pygame.color(0,128,0))   pygame.display.update()   time.sleep(1) 

and

#count_on_hdmi.py import pygame, time # on raspberry pi hdmi screne default pygame.init() screen = max(pygame.display.list_modes()) surface = pygame.display.set_mode(screen) surface.fill(pygame.color(0,0,0)) pygame.display.update() font_big = pygame.font.font(none, 150) in range(50):   print (i)   surface.fill(pygame.color(128,0,0))   text_surface = font_big.render('%s'%i, true, (255,255,255))   rect = text_surface.get_rect(center=(50,50))   surface.blit(text_surface, rect)   pygame.display.update()   time.sleep(1)   surface.fill(pygame.color(0,128,0))   pygame.display.update()   time.sleep(1) 

on mac, open 2 ssh terminals raspberry pi.

in first ssh terminal:

$ sudo python count_on_lcd.py (starts running normally) 

in second ssh terminal:

$ sudo python count_on_hdmi.py (pauses until type ^c) 

it same thing regardless order start 2 programs... first command invoke runs immediately, second command invoke requires ^c before start running.

this seems issue pygame.init() not playing nicely if itls running in separate ssh terminal.

i found solution on so. it's not pretty works.

only modified pygame requires keyboard interrupt init display

from signal import alarm, signal, sigalrm, sigkill  def init_pygame(surf):      # section unbelievable nasty hack - reason pygame     # needs keyboardinterrupt initialise in limited circs (second time running)     class alarm(exception):         pass      def alarm_handler(signum, frame):         raise alarm      signal(sigalrm, alarm_handler)     alarm(3)     print("step 2 ")     try:         pygame.init()         screen = max(pygame.display.list_modes())         surf = pygame.display.set_mode(screen)         alarm(0)     except alarm:         raise keyboardinterrupt     return (surf)