阻止QThread阻止GUI

Question

对于一个简单的聊天程序,我使用通过boost :: python包装的ac lib.

使用PyQT编写一个简单的GUI.通过对所述lib的阻塞调用来完成接收消息.为了使GUI独立刷新,通信部分处于QThread中.

虽然我认为GUI和通信是独立的,但GUI非常无响应,似乎只在消息进入时才更新.

#!/usr/bin/env python

import sys

from PyQt4.QtCore import *
from PyQt4.QtGui import *

import pynetcom2
import time


class NetCom(QThread):

  def __init__(self):
    QThread.__init__(self)
    self.client = pynetcom2.Client()
    self.client.init('127.0.0.1', 4028)
    self.client.provide('myChat', 1)
    self.client.subscribe('myChat', 100)

  def run(self):
    while (1):
      print "Waiting for message..."
      text = self.client.recvStr('myChat', True)
    return



class Netchat(QMainWindow):

    def __init__(self, argv):

        if (len(argv) != 2):
            print "Usage: %s <nickname>" %(argv[0])
            sys.exit(1)
        self.nickname = argv[1]
        print "Logging in with nickname '%s'" %(self.nickname)

        super(Netchat, self).__init__()
        self.setupUI()

        rect = QApplication.desktop().availableGeometry()
        self.resize(int(rect.width() * 0.3), int(rect.height() * 0.6))
        self.show()

        self.com = NetCom()
        self.com.start()

    def setupUI(self):
        centralWidget = QWidget()
        self.setCentralWidget(centralWidget)

        self.testList = QListWidget()

        mainLayout = QHBoxLayout()
        mainLayout.addWidget(self.testList)
        centralWidget.setLayout(mainLayout)

if __name__ == "__main__":
  app = QApplication(sys.argv)
  netchat = Netchat(sys.argv)
  app.exec_()

Answer 1

这可能是由臭名昭着的全球口译员锁(GIL)引起的.Python不允许两个线程同时执行Python代码.在C函数中,如果希望GUI代码并行运行,则必须显式释放并重新获取GIL.

Python C API文档中解释了这一点:线程状态和全局解释器锁.

归结为在C扩展中使用以下宏:

Py_BEGIN_ALLOW_THREADS

// Your expensive computation goes here.

Py_END_ALLOW_THREADS