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Exiting threads silently

Michael Bauer Mike_ba at web.de
Tue Feb 12 06:31:49 EST 2002 
Hi,

i have a small problem when exiting threads. According to the docs, a 
silent exit should be possible without an exception.

from <http://www.python.org/doc/2.2/lib/module-thread.html>:

"exit() 
Raise the SystemExit exception. When not caught, this will cause the thread 
to exit silently."

Here is the relevant code
(This is part of a proxy module)

----------------------------------------
    def error(self, code, body):
        """Answer Client with an error page

        XXX Really not very nice page...

        """
        import BaseHTTPServer
        response = BaseHTTPServer.BaseHTTPRequestHandler.responses[code][0]
        try:
            self.wfile.write("HTTP/1.0 %s %s\r\n" % (code, response))
            self.wfile.write("Server: iOwl.net ProxyServer\r\n")
            self.wfile.write("Content-type: text/html\r\n")
            self.wfile.write("\r\n")
            self.wfile.write('<html><head>\n<title>%d %s</title>\n</head>\n'
                    '<body>\n%s\n</body>\n</html>' % (code, response, body))
            self.wfile.flush()
            self.wfile.close()
            self.rfile.close()
        except IOError:
            # probably user aborted browser so we dont have a socket left   
            # to write to
            pass

        # Exit thread
        thread.exit()
----------------------------------------

What happens is the error page gets displayed correctly in the browser, but 
therad.exit() dumps following exception to the console:

----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 40400)
Traceback (most recent call last):
  File "/usr/lib/python2.2/SocketServer.py", line 458, in 
process_request_thread
    self.finish_request(request, client_address)
  File "/usr/lib/python2.2/SocketServer.py", line 253, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/lib/python2.2/SocketServer.py", line 514, in __init__
    self.handle()
  File "/home/fake/devel/iowl/pProxy/cProxyHandler.py", line 170, in handle
    server, client = self.Connect(host, port)
  File "/home/fake/devel/iowl/pProxy/cProxyHandler.py", line 346, in Connect
    self.error(200, 'Error connecting to "%s" (%s)' % (host, err))
  File "/home/fake/devel/iowl/pProxy/cProxyHandler.py", line 504, in error
    thread.exit()
SystemExit
----------------------------------------

Anybody has an idea how i can exit silently?

thanks, Mike

(Running on linux from scratch, kernel 2.4.17 with Python 2.2)
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