import threading
import time
import signal
import os
 
class task_info(object):
  def __init__(self):
    self.func = None
    self.parm0 = None
    self.parm1 = None
    self.parm2 = None
   
class task_list(object):
  def __init__(self):
    self.tl = []
    self.mutex = threading.Lock()
    self.sem = threading.Semaphore(0)
   
  def append(self, ti):
    self.mutex.acquire()
    self.tl.append(ti)
    self.mutex.release()
    self.sem.release()
   
  def fetch(self):
    self.sem.acquire()
    self.mutex.acquire()
    ti = self.tl.pop(0)    
    self.mutex.release()
    return ti
   
class thrd(threading.Thread):
  def __init__(self, tl):
    threading.Thread.__init__(self)
    self.tl = tl
   
  def run(self):
    while True:
      tsk = self.tl.fetch()
      tsk.func(tsk.parm0, tsk.parm1, tsk.parm2)  
 
class thrd_pool(object):
  def __init__(self, thd_count, tl):
    self.thds = []
     
    for i in range(thd_count):
      self.thds.append(thrd(tl))
   
  def run(self):
    for thd in self.thds:
      thd.start()
       
       
def func(parm0=None, parm1=None, parm2=None):
  print 'count:%s, thrd_name:%s'%(str(parm0), threading.currentThread().getName())
   
def cleanup(signo, stkframe):
  print ('Oops! Got signal %s', signo) 
   
  os._exit(0)
   
if __name__ == '__main__':
   
  signal.signal(signal.SIGINT, cleanup)
  signal.signal(signal.SIGQUIT, cleanup)
  signal.signal(signal.SIGTERM, cleanup)
   
  tl = task_list()
  tp = thrd_pool(6, tl)
  tp.run()
   
  count = 0
  while True:
     
    ti = task_info()
    ti.parm0 = count
    ti.func = func
    tl.append(ti)
    count += 1
     
    time.sleep(2)
  pass