#!/usr/bin/python2.4
# by pts@fazekas.hu at Wed Feb 18 15:42:05 CET 2009
import errno
import os
import select
import signal
import thread

pid = os.getpid()
print 'main pid=%d' % pid

read_fd, write_fd = os.pipe()

def Handler(arg1, arg2):
  print 'handler arg1=%r arg2=%r' % (arg1, arg2)
  os.write(write_fd, 'W')

signal.signal(signal.SIGUSR1, Handler)

can_kill_mutex = thread.allocate_lock()

def SendSIGUSR1():
  print 'S'
  can_kill_mutex.acquire()
  print 'T'
  os.kill(pid, signal.SIGUSR1)
  print 'U'

for i in xrange(1<<30):
  print '---', i
  can_kill_mutex.acquire()
  thread.start_new_thread(SendSIGUSR1, ())
  print 'A'
  can_kill_mutex.release()
  print 'B'
  try:
    got = select.select([read_fd], [], [])
  except select.error, e:
    if e.args[0] != errno.EINTR: raise
    got = str(e)
  print 'select got=%r' % (got,)
  print 'read str=%r' % (os.read(read_fd, 1),)
  can_kill_mutex.release()