pytest-xdist slave fail on Interrupted system call

• Bitbucket: https://bitbucket.org/hpk42/execnet/issue/6
• Originally reported by: @memedough
• Originally created at: 2012-04-14T03:00:30.080

Hi,

I get IOError Interrupted system call in pytest-xdist slave. Don't know why, can't see signal anywhere but fail

creating slavegateway on <__main__.Popen2IO instance at 0x20fa2d8>
RECEIVERTHREAD: starting to run
received <Message.CHANNEL_EXEC channelid=1 len=285>
received <Message.CHANNEL_DATA channelid=1 len=123>
execution starts[1]: "\nimport os\npath, nice, env = channel.receive()\
execution finished
sent <Message.CHANNEL_CLOSE channelid=1 >
1 sent channel close message
received <Message.CHANNEL_EXEC channelid=3 len=210>
1 channel.__del__
execution starts[3]: '\nimport sys, os\nchannel.send(dict(\n    executa
sent <Message.CHANNEL_DATA channelid=3 len=295>
execution finished
sent <Message.CHANNEL_CLOSE channelid=3 >
3 sent channel close message
received <Message.CHANNEL_EXEC channelid=5 len=5308>
3 channel.__del__
execution starts[5]: '"""\n    This module is executed in remote subpro
received <Message.CHANNEL_DATA channelid=5 len=1492>
RECEIVERTHREAD Traceback (most recent call last):
 File "<string>", line 622, in _thread_receiver
 File "<string>", line 802, in load
 File "<string>", line 86, in read
IOError: [Errno 4] Interrupted system call

RECEIVERTHREAD entering finalization
RECEIVERTHREAD leaving finalization
sent <Message.CHANNEL_DATA channelid=5 len=451>
sent <Message.CHANNEL_DATA channelid=5 ('collectionstart', {})>
sent <Message.CHANNEL_DATA channelid=5 len=115>
sent <Message.CHANNEL_DATA channelid=5 len=163>
sent <Message.CHANNEL_DATA channelid=5 len=244>
sent <Message.CHANNEL_DATA channelid=5 len=53>

gateway_base.Unserializer.load(self) can be made work by retry if get IOError with errno == 4

while True:
    opcode = self.stream.read(1)  # Retry this if IOError raised here
    if not opcode:
        raise EOFError

Bắt đầu với gateway_base.Unserializer.load, đặc biệt là lệnh gọi stream.read(1) được xác định trong báo cáo, và xem xét cách IOError được xử lý ở đó. Nếu có thể, hãy tái hiện lỗi slave của pytest-xdist; được xem là hoàn tất khi một Interrupted system call trong quá trình giải tuần tự hóa không còn làm hủy đường dẫn receiver và việc xử lý thông báo bình thường vẫn tiếp tục.