github.com/zuoyebang/bitalosdb@v1.1.1-0.20240516111551-79a8c4d8ce20/bitree/bdb/mlock_unix.go (about)

     1  // Copyright 2021 The Bitalosdb author(hustxrb@163.com) and other contributors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //go:build !windows
    16  
    17  package bdb
    18  
    19  import "golang.org/x/sys/unix"
    20  
    21  func mlock(db *DB, fileSize int) error {
    22  	sizeToLock := fileSize
    23  	if sizeToLock > db.datasz {
    24  		sizeToLock = db.datasz
    25  	}
    26  	if err := unix.Mlock(db.dataref[:sizeToLock]); err != nil {
    27  		return err
    28  	}
    29  	return nil
    30  }
    31  
    32  func munlock(db *DB, fileSize int) error {
    33  	if db.dataref == nil {
    34  		return nil
    35  	}
    36  
    37  	sizeToUnlock := fileSize
    38  	if sizeToUnlock > db.datasz {
    39  		sizeToUnlock = db.datasz
    40  	}
    41  
    42  	if err := unix.Munlock(db.dataref[:sizeToUnlock]); err != nil {
    43  		return err
    44  	}
    45  	return nil
    46  }