File size: 2,527 Bytes
13c2bf6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | // Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Tests a many interesting cases (network, syscalls, a little GC, busy goroutines,
// blocked goroutines, LockOSThread, pipes, and GOMAXPROCS).
//go:build ignore
package main
import (
"log"
"net"
"os"
"runtime"
"runtime/trace"
"sync"
"time"
)
func main() {
var wg sync.WaitGroup
done := make(chan bool)
// Create a goroutine blocked before tracing.
wg.Add(1)
go func() {
<-done
wg.Done()
}()
// Create a goroutine blocked in syscall before tracing.
rp, wp, err := os.Pipe()
if err != nil {
log.Fatalf("failed to create pipe: %v", err)
}
defer func() {
rp.Close()
wp.Close()
}()
wg.Add(1)
go func() {
var tmp [1]byte
rp.Read(tmp[:])
<-done
wg.Done()
}()
time.Sleep(time.Millisecond) // give the goroutine above time to block
if err := trace.Start(os.Stdout); err != nil {
log.Fatalf("failed to start tracing: %v", err)
}
defer trace.Stop()
procs := runtime.GOMAXPROCS(10)
time.Sleep(50 * time.Millisecond) // test proc stop/start events
go func() {
runtime.LockOSThread()
for {
select {
case <-done:
return
default:
runtime.Gosched()
}
}
}()
runtime.GC()
// Trigger GC from malloc.
n := 512
for i := 0; i < n; i++ {
_ = make([]byte, 1<<20)
}
// Create a bunch of busy goroutines to load all Ps.
for p := 0; p < 10; p++ {
wg.Add(1)
go func() {
// Do something useful.
tmp := make([]byte, 1<<16)
for i := range tmp {
tmp[i]++
}
_ = tmp
<-done
wg.Done()
}()
}
// Block in syscall.
wg.Add(1)
go func() {
var tmp [1]byte
rp.Read(tmp[:])
<-done
wg.Done()
}()
// Test timers.
timerDone := make(chan bool)
go func() {
time.Sleep(time.Millisecond)
timerDone <- true
}()
<-timerDone
// A bit of network.
ln, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
log.Fatalf("listen failed: %v", err)
}
defer ln.Close()
go func() {
c, err := ln.Accept()
if err != nil {
return
}
time.Sleep(time.Millisecond)
var buf [1]byte
c.Write(buf[:])
c.Close()
}()
c, err := net.Dial("tcp", ln.Addr().String())
if err != nil {
log.Fatalf("dial failed: %v", err)
}
var tmp [1]byte
c.Read(tmp[:])
c.Close()
go func() {
runtime.Gosched()
select {}
}()
// Unblock helper goroutines and wait them to finish.
wp.Write(tmp[:])
wp.Write(tmp[:])
close(done)
wg.Wait()
runtime.GOMAXPROCS(procs)
}
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