-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Apr 13, 2007, at 11:07 AM, Jean-Paul Calderone wrote:
> Likely differing buffering behavior. Prior to Linux 2.6, the pipe > implementation allowed only a single buffer (that is, the bytes from > a single write call) in a pipe at a time, and blocked subsequent > writes until that buffer was read. Recently this has changed to allow > multiple buffers up to 4k total length, so multiple short writes won't > block anymore. OS X may have some other buffering behavior which is > causing writes to block where they don't on Linux. All these details > are left to the platform, and there are a variety of behaviors which > can be considered valid. > > Of course, I don't actually /know/ the cause of the problem here, but > this explanation seems plausible to me, and I'd investigate it before > looking for platform-specific pty bugs (although OS X is a good > platform > on which to go looking for those ;). Seems plausible to me too. If I change the child writes to > 4000 bytes, Linux w/2.6 kernel will block too. I'm going to change the test_pty.py code to read from the master_fd. You have to wrap the read in a try/except to catch the OSError input/ output error you'll get on Linux when you read past the end of the buffer and the child process has already exited. Thanks, - -Barry -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (Darwin) iQCVAwUBRh+gO3EjvBPtnXfVAQJkQAP9E2Jp/EeF3ChIeNZEPVMDeG4Kd+PVslSs blNFO2oO6eO8Yn9X3hlnLwCe3W6+89bS9u7MyN1C2CCZTBz6N1QAkfDaAnxuhbNC 3hfvytMguTY0v3RiZhEVY+y/h2PfbWe6fJGXeBIfcth1HWhP0KWIgAoDA+odDm1B vZSvcxBRN1Y= =fDrh -----END PGP SIGNATURE----- _______________________________________________ Python-Dev mailing list [EMAIL PROTECTED] http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
