Date: Thu, 20 Jul 2000 15:30:31 +0800 From: "Tan Juay Kwang" <tanjk@i-dns.net> To: <freebsd-questions@freebsd.org> Subject: pthreads on 4.0-STABLE Message-ID: <NEBBLKHLGDECFCNMHPEECEMPCOAA.tanjk@i-dns.net>
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This is a multi-part message in MIME format. ------=_NextPart_000_003F_01BFF25F.6FF67160 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi, I've got some questions regarding pthreads programming on the FBSD 4.0-STABLE platform. I've 2 scenarios which I hope somebody can help me out. The first involves using pthread_create to generate several threads that basically calls gethostbyname(3). I realize that I can only create 2 threads at the most. Anything more, gethostbyname will never return and thus the program will hang indefinitely. The same program runs fine on Solaris 7 and RedHat 6.2 The second involves creating a thread that will block on a file I/O. According to materials which I've read, a call to open a named pipe read only will block until some other process opens it for writing. So the scenario is that I've a main thread that uses pthread_create to spawn another thread which will block on such an I/O, ie on the open(2) system call. The anomaly is that the pthread_create does not return until that I/O is completed. The call returns when I explicitly writes something to it. The thread does more then just trying to open a file, but that is the only point where it will block indefinitely. I tried the same thing on RedHat 6.2 and it all works fine. I haven't try it on Solaris though. Any help appreciated. Many thanks and best regards, Juay Kwang ------=_NextPart_000_003F_01BFF25F.6FF67160 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIHKjCCAy4w ggKXoAMCAQICEQDSdi6NFAw9fbKoJV2v7g11MA0GCSqGSIb3DQEBAgUAMF8xCzAJBgNVBAYTAlVT MRcwFQYDVQQKEw5WZXJpU2lnbiwgSW5jLjE3MDUGA1UECxMuQ2xhc3MgMSBQdWJsaWMgUHJpbWFy eSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTAeFw05ODA1MTIwMDAwMDBaFw0wODA1MTIyMzU5NTla MIHMMRcwFQYDVQQKEw5WZXJpU2lnbiwgSW5jLjEfMB0GA1UECxMWVmVyaVNpZ24gVHJ1c3QgTmV0 d29yazFGMEQGA1UECxM9d3d3LnZlcmlzaWduLmNvbS9yZXBvc2l0b3J5L1JQQSBJbmNvcnAuIEJ5 IFJlZi4sTElBQi5MVEQoYyk5ODFIMEYGA1UEAxM/VmVyaVNpZ24gQ2xhc3MgMSBDQSBJbmRpdmlk dWFsIFN1YnNjcmliZXItUGVyc29uYSBOb3QgVmFsaWRhdGVkMIGfMA0GCSqGSIb3DQEBAQUAA4GN ADCBiQKBgQC7WkSKBBa7Vf0DeootlE8VeDa4DUqyb5xUv7zodyqdufBou5XZMUFweoFLuUgTVi3H COGEQqvAopKrRFyqQvCCDgLpL/vCO7u+yScKXbawNkIztW5UiE+HSr8Z2vkV6A+HthzjzMaajn9q JJLj/OBluqexfu/J2zdqyErICQbkmQIDAQABo3wwejARBglghkgBhvhCAQEEBAMCAQYwRwYDVR0g BEAwPjA8BgtghkgBhvhFAQcBATAtMCsGCCsGAQUFBwIBFh93d3cudmVyaXNpZ24uY29tL3JlcG9z aXRvcnkvUlBBMA8GA1UdEwQIMAYBAf8CAQAwCwYDVR0PBAQDAgEGMA0GCSqGSIb3DQEBAgUAA4GB AIi4Nzvd2pQ3AK2qn+GBAXEekmptL/bxndPKZDjcG5gMB4ZbhRVqD7lJhaSV8Rd9Z7R/LSzdmkKe wz60jqrlCwbe8lYq+jPHvhnXU0zDvcjjF7WkSUJj7MKmFw9dWBpJPJBcVaNlIAD9GCDlX4KmsaiS xVhqwY0DPOvDzQWikK5uMIID9DCCA12gAwIBAgIQF/MjDYJPRn81g30kCzsRtzANBgkqhkiG9w0B AQQFADCBzDEXMBUGA1UEChMOVmVyaVNpZ24sIEluYy4xHzAdBgNVBAsTFlZlcmlTaWduIFRydXN0 IE5ldHdvcmsxRjBEBgNVBAsTPXd3dy52ZXJpc2lnbi5jb20vcmVwb3NpdG9yeS9SUEEgSW5jb3Jw LiBCeSBSZWYuLExJQUIuTFREKGMpOTgxSDBGBgNVBAMTP1ZlcmlTaWduIENsYXNzIDEgQ0EgSW5k aXZpZHVhbCBTdWJzY3JpYmVyLVBlcnNvbmEgTm90IFZhbGlkYXRlZDAeFw0wMDA2MjgwMDAwMDBa Fw0wMDA4MjcyMzU5NTlaMIIBAzEXMBUGA1UEChMOVmVyaVNpZ24sIEluYy4xHzAdBgNVBAsTFlZl cmlTaWduIFRydXN0IE5ldHdvcmsxRjBEBgNVBAsTPXd3dy52ZXJpc2lnbi5jb20vcmVwb3NpdG9y eS9SUEEgSW5jb3JwLiBieSBSZWYuLExJQUIuTFREKGMpOTgxHjAcBgNVBAsTFVBlcnNvbmEgTm90 IFZhbGlkYXRlZDEmMCQGA1UECxMdRGlnaXRhbCBJRCBDbGFzcyAxIC0gTmV0c2NhcGUxFzAVBgNV BAMUDkp1YXkgS3dhbmcgVGFuMR4wHAYJKoZIhvcNAQkBFg90YW5qa0BpLWRucy5uZXQwgZ8wDQYJ KoZIhvcNAQEBBQADgY0AMIGJAoGBANW3TvjbDwH/jV4bol+FogFJ2cXuX2yFvQVYBvcL/wB4jNhS oB9fIba+wt/o41hHtF0pMtjL0CHPY7mnT9DcTNHxC8TeHjnzShxLqgAaf1eBJdKr0dSm4gaxmU7b CBY03Lfce+gsHhxNclXObUSOWnG/h6Rmvb1r+Uh8ByWZZx/JAgMBAAGjgZwwgZkwCQYDVR0TBAIw ADBEBgNVHSAEPTA7MDkGC2CGSAGG+EUBBwEIMCowKAYIKwYBBQUHAgEWHGh0dHBzOi8vd3d3LnZl cmlzaWduLmNvbS9ycGEwEQYJYIZIAYb4QgEBBAQDAgeAMDMGA1UdHwQsMCowKKAmoCSGImh0dHA6 Ly9jcmwudmVyaXNpZ24uY29tL2NsYXNzMS5jcmwwDQYJKoZIhvcNAQEEBQADgYEARo2tBDBXqDl5 hlgARNC6NEC/ooWcfKpG/RsfUEbmNqBsokHtUl4qwgymzabniB+h/zY8ib5VlVkpk09xIjd/cjJO nkbVd4Txl3q6jplkvWFftTIZ/04T1opGap8haVGhdCSETDwaFT73MPUJtZrMDBzMGR1KSAarneh6 PRyXUzMxggM4MIIDNAIBATCB4TCBzDEXMBUGA1UEChMOVmVyaVNpZ24sIEluYy4xHzAdBgNVBAsT FlZlcmlTaWduIFRydXN0IE5ldHdvcmsxRjBEBgNVBAsTPXd3dy52ZXJpc2lnbi5jb20vcmVwb3Np dG9yeS9SUEEgSW5jb3JwLiBCeSBSZWYuLExJQUIuTFREKGMpOTgxSDBGBgNVBAMTP1ZlcmlTaWdu IENsYXNzIDEgQ0EgSW5kaXZpZHVhbCBTdWJzY3JpYmVyLVBlcnNvbmEgTm90IFZhbGlkYXRlZAIQ F/MjDYJPRn81g30kCzsRtzAJBgUrDgMCGgUAoIIBrDAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcB MBwGCSqGSIb3DQEJBTEPFw0wMDA3MjAwNzMwMzBaMCMGCSqGSIb3DQEJBDEWBBRf1mMNc1eWw3MF qnyU9o/Zi+HIPTBYBgkqhkiG9w0BCQ8xSzBJMAoGCCqGSIb3DQMHMA4GCCqGSIb3DQMCAgIAgDAH BgUrDgMCBzANBggqhkiG9w0DAgIBKDAHBgUrDgMCGjAKBggqhkiG9w0CBTCB8gYJKwYBBAGCNxAE MYHkMIHhMIHMMRcwFQYDVQQKEw5WZXJpU2lnbiwgSW5jLjEfMB0GA1UECxMWVmVyaVNpZ24gVHJ1 c3QgTmV0d29yazFGMEQGA1UECxM9d3d3LnZlcmlzaWduLmNvbS9yZXBvc2l0b3J5L1JQQSBJbmNv cnAuIEJ5IFJlZi4sTElBQi5MVEQoYyk5ODFIMEYGA1UEAxM/VmVyaVNpZ24gQ2xhc3MgMSBDQSBJ bmRpdmlkdWFsIFN1YnNjcmliZXItUGVyc29uYSBOb3QgVmFsaWRhdGVkAhAX8yMNgk9GfzWDfSQL OxG3MA0GCSqGSIb3DQEBAQUABIGAiMqWgUdF46GfIEzZjh56grB9fASsXJtaDlRLeLHTzVRKBCZm X7KlA2bYCBgPsUqoOEcTG7GMcpzFX3fNOR3UOpwZ74uH4+daELyj//4aG3oHuWsZKzk8qFC9hgnJ HnjTY+Lyt5NVMD7ECJDYa6TtygasjLrFp6u7THT3V3xGVIQAAAAAAAA= ------=_NextPart_000_003F_01BFF25F.6FF67160-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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