Date: Sun, 16 Oct 2022 16:36:41 +0300 From: =?UTF-8?B?0K/RgNC+0YHQu9Cw0LIg0JzQsNGI0LrQvg==?= <yaroslaw.mashko@gmail.com> To: freebsd-hackers@freebsd.org Subject: I want some clarification on kqueue, EV_CLEAR flag Message-ID: <CAMVwyx%2Br4myEm_Az%2BWp-dtUUjq0zdbsxvLLHTs6HTuFe_a%2BRNg@mail.gmail.com>
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[-- Attachment #1 --] Hello, I learn how to manage events with a kqueue. I did some research and have a confusion with EV_CLEAR and EV_DISPATCH flags. So this message contains two questions. 1. I see that EV_DISPATCH flag stays with event no matter what steps do I take. The EV_ADD | EV_ENABLE leaves the EV_DISPATCH flag in. There seem that the only way to switch off EV_DISPATCH is to delete event completely. Is it the case? 2. I was confused after a look at the man pages for kqueue. EV_CLEAR section tells that the state gets reset. My thought were that EV_DISPATCH gets switched off. After that, I did read the /src/sys/kern/kern_event.c source file. The only state that I had found changed is data plus fflags fields. The was a confusing bit of manual. -- Ярослав Машко +380 50 56 75 347 <+380+50+56+75+347> [-- Attachment #2 --] <div dir="ltr"><div>Hello,</div><div><br></div><div>I learn how to manage events with a kqueue. I did some research and have a confusion with EV_CLEAR and EV_DISPATCH flags.</div><div><br></div><div>So this message contains two questions.</div><div><br></div><div>1. I see that EV_DISPATCH flag stays with event no matter what steps do I take. The EV_ADD | EV_ENABLE leaves the EV_DISPATCH flag in.</div><div>There seem that the only way to switch off EV_DISPATCH is to delete event completely. Is it the case?</div><div><br></div><div>2. I was confused after a look at the man pages for kqueue. EV_CLEAR section tells that the state gets reset. My thought were that EV_DISPATCH gets switched off. After that, I did read the /src/sys/kern/kern_event.c source file. The only state that I had found changed is data plus fflags fields. The was a confusing bit of manual.<br></div><div><br>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">Ярослав Машко</div><div dir="ltr"><br><div><a href="tel:+380+50+56+75+347" target="_blank">+380 50 56 75 347</a></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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