Date: Fri, 15 Jan 2016 13:53:14 +0200 From: Boris Astardzhiev <boris.astardzhiev@gmail.com> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Adrian Chadd <adrian.chadd@gmail.com>, Mark Delany <c2h@romeo.emu.st>, FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: Does FreeBSD have sendmmsg or recvmmsg system calls? Message-ID: <CAP=KkTxVaqZvigg78Dg%2Bv8kuTCaZyky8x15NHqD9uabuRKRkMw@mail.gmail.com> In-Reply-To: <20160113080349.GC72455@kib.kiev.ua> References: <CAP=KkTzFUDsZwDDLD3n97xJW0qLVZMPduZGSX%2BeXC3UuLpVjMg@mail.gmail.com> <20160107161213.GZ3625@kib.kiev.ua> <CA%2BhQ2%2Bg6OB3MmZrW5hzNSnkcqKaKf1XGDraHfWXtSrowxKuL5g@mail.gmail.com> <20160107192840.GF3625@kib.kiev.ua> <20160108172323.W1815@besplex.bde.org> <20160108075815.3243.qmail@f5-external.bushwire.net> <CAJ-VmonYPhcN-gikuYQU_k5GaTAqTijoxR_0ORV4BZqsHMRJSg@mail.gmail.com> <20160108204606.G2420@besplex.bde.org> <CAJ-Vmom26mukSv3JmsmNiAONvpc6f1bQ%2BujO25qefGHY=5przA@mail.gmail.com> <CAP=KkTwG0SVUmrBuWm33EC-tG4tMTdF5rLZQ_u6G1=-ujnfjkA@mail.gmail.com> <20160113080349.GC72455@kib.kiev.ua>
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--001a113d7c3e5fb30605295e0c90 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hello, Thanks for the insightful comments. kb>Please find below. kb> kb> This implementation has some strangeness, like NOASM and PSEUDO in makefile, kb> which I cannot find a purpose for. I removed it but initially I thought it was necessary. kb>Big issue with the implementation is the interposing stuff, why do you kb> need it at all ? Is it to correctly handle cancellation, to not fall kb> into sleepable syscall when previous loop step was cancelled ? Yes. I initially thought it was better to use the interposing table. kb> If yes, you _can_ use pthread_testcancel(3) etc in libc. Libc provides kb> stubs for them with trivial implementation, which is reset to the real kb> one if libthr is loaded. Then you can simplify your patch significantly, kb> avoiding the need for interposing and writing the loops both in libc an= d kb> libthr. Got it. See patch. I think I removed the interposing stuff as suggested. I didn't know about the stubs. But how for instance pthread_testcancel() will cope with sleeping recvmmsg for example? I'm not sure about the cancellation stuff here. Probably my approach is not correct? I looked through lib/ for an example and only stumbled on lib/libc/gen/sem.c where pthread_testcancel() is used but again I'm not sure if I'm tackling it correctly in the calls. kb> BTW, do you have tests for the cancellation of the new functions ? Unfortunately no. Ideas and guidelines how to stress test the calls regarding functionality and especially cancellation? kb> Again, the patch lacks man page updates. I'll try to write some soon. Best regards, Boris Astardzhiev =E2=80=8B --001a113d7c3e5fb30605295e0c90 Content-Type: text/plain; charset=US-ASCII; name="sendrecvmmsg-libconly2.diff" Content-Disposition: attachment; filename="sendrecvmmsg-libconly2.diff" Content-Transfer-Encoding: base64 X-Attachment-Id: f_ijfm701z0 ZGlmZiAtLWdpdCBhL2xpYi9saWJjL2luY2x1ZGUvbmFtZXNwYWNlLmggYi9saWIvbGliYy9pbmNs dWRlL25hbWVzcGFjZS5oCmluZGV4IDczOWQ3YjEuLmM5NTgyOWUgMTAwNjQ0Ci0tLSBhL2xpYi9s aWJjL2luY2x1ZGUvbmFtZXNwYWNlLmgKKysrIGIvbGliL2xpYmMvaW5jbHVkZS9uYW1lc3BhY2Uu aApAQCAtMjA4LDYgKzIwOCw3IEBACiAjZGVmaW5lCQlyZWFkdgkJCQlfcmVhZHYKICNkZWZpbmUJ CXJlY3Zmcm9tCQkJX3JlY3Zmcm9tCiAjZGVmaW5lCQlyZWN2bXNnCQkJCV9yZWN2bXNnCisjZGVm aW5lCQlyZWN2bW1zZwkJCV9yZWN2bW1zZwogI2RlZmluZQkJc2VsZWN0CQkJCV9zZWxlY3QKICNk ZWZpbmUJCXNlbV9jbG9zZQkJCV9zZW1fY2xvc2UKICNkZWZpbmUJCXNlbV9kZXN0cm95CQkJX3Nl bV9kZXN0cm95CkBAIC0yMjAsNiArMjIxLDcgQEAKICNkZWZpbmUJCXNlbV91bmxpbmsJCQlfc2Vt X3VubGluawogI2RlZmluZQkJc2VtX3dhaXQJCQlfc2VtX3dhaXQKICNkZWZpbmUJCXNlbmRtc2cJ 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