memoryMapAndGenerate¶
| Source (upstream pre-purge) | Current | |
|---|---|---|
| File | consensus/ethash/ethash.go |
ethash.go |
| Symbol | memoryMapAndGenerate |
memoryMapAndGenerate |
| Ref | dde2da0ef~1 |
etc/v1.17.3-full-node |
3-way merge — purge → getc ← upstream¶
pre-purge
↗// memoryMapAndGenerate tries to memory map a temporary file of uint32s for write
// access, fill it with the data from a generator and then move it into the final
// path requested.
func memoryMapAndGenerate(path string, size uint64, lock bool, generator func(buffer []uint32)) (*os.File, mmap.MMap, []uint32, error) {
// Ensure the data folder exists
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
return nil, nil, nil, err
}
// Create a huge temporary empty file to fill with data
temp := path + "." + strconv.Itoa(rand.Int())
↗ dump, err := os.Create(temp)
if err != nil {
return nil, nil, nil, err
}
if err = ensureSize(dump, int64(len(dumpMagic))*4+int64(size)); err != nil {
dump.Close()
os.Remove(temp)
return nil, nil, nil, err
}
// Memory map the file for writing and fill it with the generator
mem, buffer, err := memoryMapFile(dump, true)
if err != nil {
dump.Close()
os.Remove(temp)
return nil, nil, nil, err
}
copy(buffer, dumpMagic)
↗ data := buffer[len(dumpMagic):]
generator(data)
↗ if err := mem.Unmap(); err != nil {
return nil, nil, nil, err
}
if err := dump.Close(); err != nil {
return nil, nil, nil, err
}
if err := os.Rename(temp, path); err != nil {
return nil, nil, nil, err
}
return memoryMap(path, lock)
}