44 lines
1.4 KiB
Go
44 lines
1.4 KiB
Go
/*
|
|
* Copyright 2019 Dgraph Labs, Inc. and Contributors
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package z
|
|
|
|
import (
|
|
"os"
|
|
)
|
|
|
|
// Mmap uses the mmap system call to memory-map a file. If writable is true,
|
|
// memory protection of the pages is set so that they may be written to as well.
|
|
func Mmap(fd *os.File, writable bool, size int64) ([]byte, error) {
|
|
return mmap(fd, writable, size)
|
|
}
|
|
|
|
// Munmap unmaps a previously mapped slice.
|
|
func Munmap(b []byte) error {
|
|
return munmap(b)
|
|
}
|
|
|
|
// Madvise uses the madvise system call to give advise about the use of memory
|
|
// when using a slice that is memory-mapped to a file. Set the readahead flag to
|
|
// false if page references are expected in random order.
|
|
func Madvise(b []byte, readahead bool) error {
|
|
return madvise(b, readahead)
|
|
}
|
|
|
|
// Msync would call sync on the mmapped data.
|
|
func Msync(b []byte) error {
|
|
return msync(b)
|
|
}
|