hi,
I do not seem to to get this one to not panic, and do not understand why
yet.
This code gets the names of files using shell globbing , so go run
testchannels.go dir/*
This gets the name and size info of all 1000 files in the dire, but panics
at the end with a deadlock:
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [select]:
main.run({0xc000118018, 0x3e8, 0x57f308?})
/pathtestchannels.go:44 +0x278
main.main()
/path/testchannels.go:15 +0x66
exit status 2
I do not seem to be able to find my mistake. Any hints appreciated ;-).
package main
import (
"flag"
"fmt"
"os"
"sync"
)
func main() {
flag.Parse()
files := flag.Args()
run(files)
}
func run(files []string) {
errCh := make(chan error, 10)
resCh := make(chan string, 10)
doneCh := make(chan struct{})
wg := sync.WaitGroup{}
for _, file := range files {
wg.Add(1)
go func(file string) {
defer wg.Done()
f, err := os.Stat(file)
if err != nil {
errCh <- fmt.Errorf("could not stat %s:
%w\n", file, err)
}
resCh <- fmt.Sprintf("name: %s\t size: %d",
f.Name(), f.Size())
}(file)
}
go func() {
wg.Wait()
close(doneCh)
}()
for {
select {
case err := <-errCh:
fmt.Println(err)
case data := <-resCh:
fmt.Println("from result channel: ", data)
}
}
}
regards,
Natxo
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