lib9p

Go 9P library.
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pool.go (745B)

      1 package lib9p
      2 
      3 import (
      4 	"fmt"
      5 
      6 )
      7 
      8 type FidPool struct {
      9 	m map[uint32]*Fid
     10 }
     11 
     12 func allocFidPool() *FidPool {
     13 	f := new(FidPool)
     14 	f.m = make(map[uint32]*Fid)
     15 	return f
     16 }
     17 
     18 func (pool *FidPool) lookup(fid uint32) (*Fid, bool) {
     19 	f, ok := pool.m[fid]
     20 	return f, ok
     21 }
     22 
     23 func (pool *FidPool) alloc(fid uint32) (*Fid, error) {
     24 	if _, ok := pool.m[fid]; ok {
     25 		return nil, fmt.Errorf("fid already in use.")
     26 	}
     27 	f := newFid(fid)
     28 	pool.m[fid] = f
     29 	return f, nil
     30 }
     31 
     32 func (pool *FidPool) delete(fid uint32) *Fid {
     33 	f, ok := pool.lookup(fid)
     34 	if !ok {
     35 		return nil
     36 	}
     37 	delete(pool.m, fid)
     38 	return f
     39 }
     40 
     41 func (pool *FidPool) String() string {
     42 	s := "{"
     43 	for fnum, fstruct := range pool.m {
     44 		s += fmt.Sprintf(" [%d]%v", fnum, fstruct)
     45 	}
     46 	s += "}"
     47 	return s
     48 }