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Example genmaps doesn't open all files at the same time. To avoid "too many open files" error in linux.

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This commit is contained in:
Tnze
2021-03-13 13:01:07 +08:00
parent 8dbb96cdfd
commit 7f91383a1d
2 changed files with 29 additions and 22 deletions
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51
examples/genmaps/genmaps.go
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@ -43,29 +43,36 @@ func main() {
mkmin(&min[1], &pos[1])
}
// Open mca files
var rs = make(map[[2]int]*region.Region, len(de))
for _, dir := range de {
name := dir.Name()
path := filepath.Join(*regionsFold, name)
var pos [2]int // {x, z}
if _, err := fmt.Sscanf(name, "r.%d.%d.mca", &pos[0], &pos[1]); err != nil {
log.Printf("Error parsing file name of %s: %v, ignoring", name, err)
continue
}
updateMinMax(pos)
r, err := region.Open(path)
if err != nil {
log.Printf("Error when opening %s: %v, ignoring", name, err)
continue
}
rs[pos] = r
type regions struct {
pos [2]int
*region.Region
}
// Open mca files
var rs = make(chan regions, regionWorkerNum)
go func() {
for _, dir := range de {
name := dir.Name()
path := filepath.Join(*regionsFold, name)
var pos [2]int // {x, z}
if _, err := fmt.Sscanf(name, "r.%d.%d.mca", &pos[0], &pos[1]); err != nil {
log.Printf("Error parsing file name of %s: %v, ignoring", name, err)
continue
}
updateMinMax(pos)
r, err := region.Open(path)
if err != nil {
log.Printf("Error when opening %s: %v, ignoring", name, err)
continue
}
rs <- regions{pos: pos, Region: r}
}
close(rs)
}()
bigPicture := image.NewRGBA(image.Rect(min[0]*512, min[1]*512, max[0]*512+512, max[1]*512+512))
var bigWg sync.WaitGroup
// draw columns
for pos, r := range rs {
for r := range rs {
img := image.NewRGBA(image.Rect(0, 0, 32*16, 32*16))
type task struct {
data []byte
@ -111,7 +118,7 @@ func main() {
wg.Wait()
// Save pictures
bigWg.Add(1)
log.Print("Draw: ", pos)
log.Print("Draw: ", r.pos)
go func(img image.Image, pos [2]int) {
savePng(img, fmt.Sprintf("r.%d.%d.png", pos[0], pos[1]))
draw.Draw(
@ -119,10 +126,10 @@ func main() {
img, image.Pt(0, 0), draw.Src,
)
bigWg.Done()
}(img, pos)
}(img, r.pos)
// To close mca files
if err := r.Close(); err != nil {
log.Printf("Close r.%d.%d.mca error: %v", pos[0], pos[1], err)
log.Printf("Close r.%d.%d.mca error: %v", r.pos[0], r.pos[1], err)
}
}
bigWg.Wait()