[issue11891] Poll call in multiprocessing/forking.py is not thread safe. Results in "OSError: [Errno 10] No child processes" exceptions.

[Gary Yee]

Gary Yee <g...@penguincomputing.com> added the comment:

Here's how I changed poll() in multiprocessing/forking.py:

        def poll(self, flag=os.WNOHANG):
            if self.returncode is None:
                try:
                    pid, sts = os.waitpid(self.pid, flag)
                except OSError, e:
                    if e.errno == 10:
                        return self.returncode
                    else:
                        raise
                if pid == self.pid:
                    if os.WIFSIGNALED(sts):
                        self.returncode = -os.WTERMSIG(sts)
                    else:
                        assert os.WIFEXITED(sts)
                        self.returncode = os.WEXITSTATUS(sts)
            return self.returncode

----------
versions: +Python 2.5, Python 2.6, Python 3.4 -Python 2.7, Python 3.1, Python 
3.2, Python 3.3

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