98 lines
1.5 KiB
Go
98 lines
1.5 KiB
Go
// Copyright 2014 The gocui Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"log"
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"sync"
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"time"
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"github.com/jroimartin/gocui"
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)
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const NumGoroutines = 10
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var (
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done = make(chan struct{})
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wg sync.WaitGroup
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mu sync.Mutex // protects ctr
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ctr = 0
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)
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func main() {
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g, err := gocui.NewGui(gocui.OutputNormal)
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if err != nil {
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log.Panicln(err)
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}
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defer g.Close()
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g.SetManagerFunc(layout)
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if err := keybindings(g); err != nil {
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log.Panicln(err)
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}
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for i := 0; i < NumGoroutines; i++ {
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wg.Add(1)
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go counter(g)
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}
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if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
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log.Panicln(err)
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}
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wg.Wait()
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}
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func layout(g *gocui.Gui) error {
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if v, err := g.SetView("ctr", 2, 2, 12, 4); err != nil {
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if err != gocui.ErrUnknownView {
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return err
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}
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fmt.Fprintln(v, "0")
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}
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return nil
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}
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func keybindings(g *gocui.Gui) error {
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if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
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return err
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}
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return nil
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}
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func quit(g *gocui.Gui, v *gocui.View) error {
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close(done)
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return gocui.ErrQuit
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}
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func counter(g *gocui.Gui) {
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defer wg.Done()
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for {
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select {
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case <-done:
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return
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case <-time.After(500 * time.Millisecond):
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mu.Lock()
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n := ctr
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ctr++
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mu.Unlock()
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g.Update(func(g *gocui.Gui) error {
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v, err := g.View("ctr")
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if err != nil {
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return err
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}
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v.Clear()
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fmt.Fprintln(v, n)
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return nil
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})
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}
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}
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}
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