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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 12 Oct 2013
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      Is there any way to implement Go-like "defer" in a zero-cost way, like RAII? I don't see any way to do it.

      3 replies 0 retweets 0 likes
    2. Sam Tobin-Hochstadt‏ @samth 12 Oct 2013
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      Replying to @pcwalton

      @pcwalton do you mean zero-cost if you don't use it?

      1 reply 0 retweets 0 likes
    3. Patrick Walton‏ @pcwalton 12 Oct 2013
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      Replying to @samth

      .@samth Right, zero bookkeeping cost in the no-throw (no-panic) path.

      2 replies 0 retweets 0 likes
    4. Sam Tobin-Hochstadt‏ @samth 12 Oct 2013
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      Replying to @pcwalton

      @pcwalton does deferred code run on normal exit or just panic?

      1 reply 0 retweets 0 likes
    5. Patrick Walton‏ @pcwalton 12 Oct 2013
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      Replying to @samth

      @samth It runs on both, but whether the code actually needs to run is determined at runtime.

      1 reply 0 retweets 0 likes
    6. Sam Tobin-Hochstadt‏ @samth 12 Oct 2013
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      Replying to @pcwalton

      @pcwalton Determined how?

      1 reply 0 retweets 0 likes
    7. Patrick Walton‏ @pcwalton 12 Oct 2013
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      Replying to @samth

      @samth func Foo() { ... if bar() { defer baz(); } ... /* baz() only runs here if bar() evaluated to true */ }

      2 replies 0 retweets 0 likes
    8. Martin‏ @___mna___ 12 Oct 2013
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      Replying to @pcwalton

      @pcwalton I'm pretty sure this *is* zero-cost at runtime if bar() is false. You're saying it isn't?

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 12 Oct 2013
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      Replying to @___mna___

      @PuerkitoBio How would you implement it? Remember "defer"red functions must execute at the end of the function, not end of block.

      3:46 PM - 12 Oct 2013
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Martin‏ @___mna___ 12 Oct 2013
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          Replying to @pcwalton

          @pcwalton I haven't checked the assembly output (use go tool 6c -S FILE), but nothing gets evaluated in this case: http://play.golang.org/p/w12VUpT7ZP 

          1 reply 0 retweets 0 likes
        3. Patrick Walton‏ @pcwalton 12 Oct 2013
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          Replying to @___mna___

          @PuerkitoBio I mean that "defer" has no runtime overhead when control flow encounters it, only when unwinding or exiting the function.

          2 replies 0 retweets 0 likes
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        1. Martin‏ @___mna___ 12 Oct 2013
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          Replying to @pcwalton

          @pcwalton IOW there"s certainly a compiler and generated machine code overhead, but no runtime overhead. If that's what we're talking about?

          0 replies 0 retweets 0 likes
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