func Open(name string, disk disk.Disk) (*Manager, error) {
f, err := shm.Open(name, os.O_RDWR)
if err != nil {
return nil, err
}
buckets, mmap, err := asBuckets(f)
if err != nil {
return nil, err
}
mgr := &Manager{
f: f,
disk: disk,
buckets: buckets,
mmap: mmap,
open: make(map[int]*openBucket),
empty: make([]int, 0),
}
for _, bkt := range buckets {
if bkt.state == EMPTY {
mgr.empty = append(mgr.empty, bkt.idx)
}
}
for len(mgr.open) < MaxOpen {
mgr.open_new_bucket()
}
return mgr, nil
}
func Create(name string, diskSize uint64) error {
bucketCount := diskSize / BucketSize
f, err := shm.Open(name, os.O_RDWR|os.O_CREATE|os.O_EXCL)
if err != nil {
return err
}
defer f.Close()
err = f.Truncate(int64(bucketCount * uint64(unsafe.Sizeof(bucket{}))))
if err != nil {
return err
}
buckets, mmap, err := asBuckets(f)
if err != nil {
return err
}
for idx := range buckets {
bkt := &buckets[idx]
bkt.idx = idx
bkt.state = EMPTY
}
return mmap.Sync(gommap.MS_SYNC)
}
func Create(name string, n uint64) error {
f, err := shm.Open(name, os.O_RDWR|os.O_CREATE|os.O_EXCL)
if err != nil {
return err
}
defer f.Close()
err = f.Truncate(int64(n) * int64(unsafe.Sizeof(entry{})))
if err != nil {
return err
}
return nil
}
func Open(name string) (Table, error) {
f, err := shm.Open(name, os.O_RDWR)
if err != nil {
return nil, err
}
arr, mmap, err := shm.MMapTyped(f, entry{})
if err != nil {
return nil, err
}
entries, ok := arr.([]entry)
if !ok {
panic("failed to cast []byte to []entry")
}
return &table{
f: f,
entries: entries,
mmap: mmap,
}, nil
}