一个python多进程错误
我这里有一个multprocess演示，我遇到了一些问题。研究了一个晚上，我无法解决原因。 有人能帮我吗 我想让一个父进程充当生产者，当有任务出现时，父进程可以派生一些子进程来使用这些任务。父级监视子级，如果任何一个异常退出，则可以由父级重新启动一个python多进程错误,python,multiprocess,Python,Multiprocess,我这里有一个multprocess演示，我遇到了一些问题。研究了一个晚上，我无法解决原因。 有人能帮我吗 我想让一个父进程充当生产者，当有任务出现时，父进程可以派生一些子进程来使用这些任务。父级监视子级，如果任何一个异常退出，则可以由父级重新启动 #!/usr/bin/env python # -*- coding: utf-8 -*- from multiprocessing import Process, Queue from Queue import Empty import sys,
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from multiprocessing import Process, Queue from Queue import Empty import sys, signal, os, random, time import traceback
child_process = []
child_process_num = 4
queue = Queue(0)
def work(queue):
signal.signal(signal.SIGINT, signal.SIG_DFL)
signal.signal(signal.SIGTERM, signal.SIG_DFL)
signal.signal(signal.SIGCHLD, signal.SIG_DFL)
time.sleep(10) #demo sleep
def kill_child_processes(signum, frame):
#terminate all children
pass
def restart_child_process(signum, frame):
global child_process
for i in xrange(len(child_process)):
child = child_process[i]
try:
if child.is_alive():
continue
except OSError, e:
pass
child.join() #join this process to make sure there is no zombie process
new_child = Process(target=work, args=(queue,))
new_child.start()
child_process[i] = new_child #restart one new process
child = None
return
if __name__ == '__main__':
reload(sys)
sys.setdefaultencoding("utf-8")
for i in xrange(child_process_num):
child = Process(target=work, args=(queue,))
child.start()
child_process.append(child)
signal.signal(signal.SIGINT, kill_child_processes)
signal.signal(signal.SIGTERM, kill_child_processes) #hook the SIGTERM
signal.signal(signal.SIGCHLD, restart_child_process)
signal.signal(signal.SIGPIPE, signal.SIG_DFL)
Error in atexit._run_exitfuncs:
Error in sys.exitfunc:
Traceback (most recent call last):
File "/usr/local/python/lib/python2.6/atexit.py", line 30, in _run_exitfuncs
traceback.print_exc()
File "/usr/local/python/lib/python2.6/traceback.py", line 227, in print_exc
print_exception(etype, value, tb, limit, file)
File "/usr/local/python/lib/python2.6/traceback.py", line 124, in print_exception
_print(file, 'Traceback (most recent call last):')
File "/usr/local/python/lib/python2.6/traceback.py", line 12, in _print
def _print(file, str='', terminator='\n'):
File "test.py", line 42, in restart_child_process
new_child.start()
File "/usr/local/python/lib/python2.6/multiprocessing/process.py", line 99, in start
_cleanup()
File "/usr/local/python/lib/python2.6/multiprocessing/process.py", line 53, in _cleanup
if p._popen.poll() is not None:
File "/usr/local/python/lib/python2.6/multiprocessing/forking.py", line 106, in poll
pid, sts = os.waitpid(self.pid, flag)
OSError: [Errno 10] No child processes
Error in atexit._run_exitfuncs:
Error in sys.exitfunc:
Traceback (most recent call last):
File "/usr/local/python/lib/python2.6/atexit.py", line 30, in _run_exitfuncs
traceback.print_exc()
File "/usr/local/python/lib/python2.6/traceback.py", line 227, in print_exc
print_exception(etype, value, tb, limit, file)
File "/usr/local/python/lib/python2.6/traceback.py", line 124, in print_exception
_print(file, 'Traceback (most recent call last):')
File "/usr/local/python/lib/python2.6/traceback.py", line 12, in _print
def _print(file, str='', terminator='\n'):
File "test.py", line 42, in restart_child_process
new_child.start()
File "/usr/local/python/lib/python2.6/multiprocessing/process.py", line 99, in start
_cleanup()
File "/usr/local/python/lib/python2.6/multiprocessing/process.py", line 53, in _cleanup
if p._popen.poll() is not None:
File "/usr/local/python/lib/python2.6/multiprocessing/forking.py", line 106, in poll
pid, sts = os.waitpid(self.pid, flag)
OSError: [Errno 10] No child processes
主进程正在等待所有子进程在退出之前终止，因此有一个阻塞调用（即wait4）注册为at_退出句柄。您发送的信号会中断阻塞调用，从而中断堆栈跟踪 我不清楚的是，发送给子进程的信号是否会被重定向到父进程，然后父进程会中断wait4调用。这与Unix进程组行为有关