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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    Tim Sweeney‏ @TimSweeneyEpic 27 Jun 2018
    • Report Tweet
    • Report NetzDG Violation

    Anybody know how Windows VirtualProtect timing works across threads? If I call VirtualProtect(...PAGE_READONLY) then set a flag via LOCK OR, is it possible that other threads will see the flag set but still be able to write to the page?

    11:22 AM - 27 Jun 2018
    • 4 Retweets
    • 15 Likes
    • Jonathon Hoogland Roman Smirnov The Hooded Knight Kiki McCloud Alejandro García keyur Mr_SquarePeg 🌹 Scott Wardle
    5 replies 4 retweets 15 likes
      1. New conversation
      2. sushil lakra‏ @sushillakra21 8 Sep 2018
        • Report Tweet
        • Report NetzDG Violation
        Replying to @TimSweeneyEpic

        Hi, How expensive is VirtualProtect call?

        1 reply 0 retweets 0 likes
      3. Tim Sweeney‏ @TimSweeneyEpic 8 Sep 2018
        • Report Tweet
        • Report NetzDG Violation
        Replying to @sushillakra21

        When relaxing protections, it’s a few hundred cycles. When increasing protections, it’s 100,000+ including interrupting each thread via IPI to update page tables. (The answer to the original question above is: yes)

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Oleksii Skidan‏ @lupus_subdola 27 Jun 2018
        • Report Tweet
        • Report NetzDG Violation
        Replying to @TimSweeneyEpic

        I assume that VirtualProtect is implemented as a syscall that modifies GDT. In that case all threads shall see the same.

        1 reply 0 retweets 1 like
      3. Tamir Bahar‏ @tmr232 27 Jun 2018
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        Replying to @lupus_subdola @TimSweeneyEpic

        Yeah, it should be impossible for any thread to write to that memory as soon as the syscall returns. But do you know if it invalidates the cache immediately?

        1 reply 0 retweets 0 likes
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      1. Gareth Martin‏ @TheThiefMaster 27 Jun 2018
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        I agree with the others, it should work

        0 replies 0 retweets 0 likes
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      1. Pr1m04k‏ @pr1m04k 4 Jul 2018
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        Replying to @TimSweeneyEpic

        @TimSweeneyEpic Hello, my mom disabled my paypal account then my epic games account and my account ahve a lot of skins and stuff on it worth 1000$ and i really want it back thanks for your help

        0 replies 0 retweets 0 likes
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      1. Dakleck0‏ @DaKleck0 27 Jun 2018
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        Replying to @TimSweeneyEpic

        Does anyone know when these ignorant fortnite peeps gonna bring out SEA servers? When there greed will be over? Never? Ok ty

        0 replies 0 retweets 4 likes
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