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f8ef685bdd
在四点链接的情况下，我们只终端中间两点是不够的，要切三刀； 总之实践很简单，就是copy完成之后，要Close所有的链接 readv的话，系统readv数组和buffer不要在put进pool后相互引用 添加-bl 选项，可以自定义buf大小；注意越小可能越慢，建议buf大小保持在4k以上 添加-pp选项，可以生成cpu.pprof文件 修复其它小问题.
56 lines
1.2 KiB
Go
56 lines
1.2 KiB
Go
//go:build !windows && !wasm && !illumos
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// +build !windows,!wasm,!illumos
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package utils
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import (
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"syscall"
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"unsafe"
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)
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func GetReadVReader() SystemReadver {
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return &posixReader{}
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}
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type posixReader struct {
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iovecs []syscall.Iovec
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}
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func (r *posixReader) Init(bs [][]byte, singleBufLen int) {
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iovecs := r.iovecs
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if iovecs == nil {
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iovecs = make([]syscall.Iovec, 0, len(bs))
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}
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for idx, b := range bs {
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iovecs = append(iovecs, syscall.Iovec{
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Base: &(b[0]),
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})
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iovecs[idx].SetLen(singleBufLen)
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}
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r.iovecs = iovecs
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}
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//正常readv返回的应该是 ssize_t, 在64位机器上应该是 int64, 但是负数只用于返回-1错误，而且我们提供的buffer长度远远小于 uint32的上限；所以uint32可以
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func (r *posixReader) Read(fd uintptr) (uint32, error) {
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n, _, e := syscall.Syscall(syscall.SYS_READV, fd, uintptr(unsafe.Pointer(&r.iovecs[0])), uintptr(len(r.iovecs)))
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if e != 0 {
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return 0, e
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}
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return uint32(n), nil
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}
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func (r *posixReader) Clear() {
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for idx := range r.iovecs {
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r.iovecs[idx].Base = nil
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}
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r.iovecs = r.iovecs[:0]
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}
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func (r *posixReader) Recover(bsLen int, bs [][]byte) {
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r.iovecs = r.iovecs[:len(bs)]
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for idx := range r.iovecs {
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r.iovecs[idx].Base = &(bs[idx][0])
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}
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}
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