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look-free circular queue in Golang

License: MIT License

Assembly 11.47% Go 88.53%

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这代码有 race 啊

不知道为啥要在汇编代码前面加 // build !race

去了之后写了个俩消费者俩生产者的 demo，然后 go run -race demo.go 跑了一下就 race 了。

看到你给 go 提的 xor 的 issue 追过来的，想顺便问一下你提到的 intel 汇编的那个指令编程优化手册是在哪找到的，能否发个链接？

demo.go:

package main

import (
    "sync"
    "github.com/templexxx/fqueue"
)

func main() {
    q, err := fqueue.New(16)
    if err != nil {
        panic(err)
    }
    var w sync.WaitGroup
    w.Add(4)
    go func() {
        defer w.Done()
        for i := 0; i < 10000; i++ {
            q.Push(i)
        }
    }()
    go func() {
        defer w.Done()
        for i := 10000; i < 20000; i++ {
            q.Push(i)
        }
    }()
    go func() {
        defer w.Done()
        for i := 0; i < 10000; i++ {
            q.Get()
        }
    }()
    go func() {
        defer w.Done()
        for i := 10000; i < 20000; i++ {
            q.Get()
        }
    }()
    w.Wait()
}

==================
WARNING: DATA RACE
Read at 0x00c42007c028 by goroutine 7:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:111 +0x15e
  main.main.func3()
      /home/cholerae/test/gotest/testfqueue.go:30 +0x6b

Previous write at 0x00c42007c028 by goroutine 5:
  github.com/templexxx/fqueue.(*queue).Push()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:77 +0x1b8
  main.main.func1()
      /home/cholerae/test/gotest/testfqueue.go:18 +0x9e

Goroutine 7 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:27 +0x1c0

Goroutine 5 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:15 +0x168
==================
==================
WARNING: DATA RACE
Read at 0x00c42007c040 by goroutine 8:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:111 +0x15e
  main.main.func4()
      /home/cholerae/test/gotest/testfqueue.go:36 +0x6e

Previous write at 0x00c42007c040 by goroutine 5:
  github.com/templexxx/fqueue.(*queue).Push()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:77 +0x1b8
  main.main.func1()
      /home/cholerae/test/gotest/testfqueue.go:18 +0x9e

Goroutine 8 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:33 +0x1ec

Goroutine 5 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:15 +0x168
==================
==================
WARNING: DATA RACE
Read at 0x00c42007c030 by goroutine 8:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:112 +0x196
  main.main.func4()
      /home/cholerae/test/gotest/testfqueue.go:36 +0x6e

Previous write at 0x00c42007c030 by goroutine 5:
  github.com/templexxx/fqueue.(*queue).Push()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:76 +0x17e
  main.main.func1()
      /home/cholerae/test/gotest/testfqueue.go:18 +0x9e

Goroutine 8 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:33 +0x1ec

Goroutine 5 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:15 +0x168
==================
==================
WARNING: DATA RACE
Read at 0x00c42007c018 by goroutine 7:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:112 +0x196
  main.main.func3()
      /home/cholerae/test/gotest/testfqueue.go:30 +0x6b

Previous write at 0x00c42007c018 by goroutine 5:
  github.com/templexxx/fqueue.(*queue).Push()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:76 +0x17e
  main.main.func1()
      /home/cholerae/test/gotest/testfqueue.go:18 +0x9e

Goroutine 7 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:27 +0x1c0

Goroutine 5 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:15 +0x168
==================
==================
WARNING: DATA RACE
Read at 0x00c42007d1d0 by goroutine 7:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:112 +0x196
  main.main.func3()
      /home/cholerae/test/gotest/testfqueue.go:30 +0x6b

Previous write at 0x00c42007d1d0 by goroutine 5:
  [failed to restore the stack]

Goroutine 7 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:27 +0x1c0

Goroutine 5 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:15 +0x168
==================
==================
WARNING: DATA RACE
Read at 0x00c42007d1f8 by goroutine 8:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:111 +0x15e
  main.main.func4()
      /home/cholerae/test/gotest/testfqueue.go:36 +0x6e

Previous write at 0x00c42007d1f8 by goroutine 5:
  [failed to restore the stack]

Goroutine 8 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:33 +0x1ec

Goroutine 5 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:15 +0x168
==================
==================
WARNING: DATA RACE
Read at 0x00c42007d210 by goroutine 7:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:111 +0x15e
  main.main.func3()
      /home/cholerae/test/gotest/testfqueue.go:30 +0x6b

Previous write at 0x00c42007d210 by goroutine 5:
  [failed to restore the stack]

Goroutine 7 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:27 +0x1c0

Goroutine 5 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:15 +0x168
==================
==================
WARNING: DATA RACE
Read at 0x00c42007d1e8 by goroutine 8:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:112 +0x196
  main.main.func4()
      /home/cholerae/test/gotest/testfqueue.go:36 +0x6e

Previous write at 0x00c42007d1e8 by goroutine 5:
  [failed to restore the stack]

Goroutine 8 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:33 +0x1ec

Goroutine 5 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:15 +0x168
==================
==================
WARNING: DATA RACE
Read at 0x00c4200b9738 by goroutine 7:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:111 +0x15e
  main.main.func3()
      /home/cholerae/test/gotest/testfqueue.go:30 +0x6b

Previous write at 0x00c4200b9738 by goroutine 6:
  github.com/templexxx/fqueue.(*queue).Push()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:77 +0x1b8
  main.main.func2()
      /home/cholerae/test/gotest/testfqueue.go:24 +0xa1

Goroutine 7 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:27 +0x1c0

Goroutine 6 (finished) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:21 +0x194
==================
==================
WARNING: DATA RACE
Read at 0x00c4200b9750 by goroutine 8:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:111 +0x15e
  main.main.func4()
      /home/cholerae/test/gotest/testfqueue.go:36 +0x6e

Previous write at 0x00c4200b9750 by goroutine 6:
  github.com/templexxx/fqueue.(*queue).Push()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:77 +0x1b8
  main.main.func2()
      /home/cholerae/test/gotest/testfqueue.go:24 +0xa1

Goroutine 8 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:33 +0x1ec

Goroutine 6 (finished) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:21 +0x194
==================
==================
WARNING: DATA RACE
Read at 0x00c4200b9728 by goroutine 7:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:112 +0x196
  main.main.func3()
      /home/cholerae/test/gotest/testfqueue.go:30 +0x6b

Previous write at 0x00c4200b9728 by goroutine 6:
  github.com/templexxx/fqueue.(*queue).Push()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:76 +0x17e
  main.main.func2()
      /home/cholerae/test/gotest/testfqueue.go:24 +0xa1

Goroutine 7 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:27 +0x1c0

Goroutine 6 (finished) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:21 +0x194
==================
==================
WARNING: DATA RACE
Read at 0x00c4200b9740 by goroutine 8:
  github.com/templexxx/fqueue.(*queue).Get()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:112 +0x196
  main.main.func4()
      /home/cholerae/test/gotest/testfqueue.go:36 +0x6e

Previous write at 0x00c4200b9740 by goroutine 6:
  github.com/templexxx/fqueue.(*queue).Push()
      /home/cholerae/gopath/src/github.com/templexxx/fqueue/fqueue.go:76 +0x17e
  main.main.func2()
      /home/cholerae/test/gotest/testfqueue.go:24 +0xa1

Goroutine 8 (running) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:33 +0x1ec

Goroutine 6 (finished) created at:
  main.main()
      /home/cholerae/test/gotest/testfqueue.go:21 +0x194
==================
Found 12 data race(s)
exit status 66

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