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9af83321ec
Plan 9 doesn't have mmap, so we just return an error.
File locking is implemented using the exclusive mode bit.
From http://man.cat-v.org/plan_9/5/open:
If the file is marked for exclusive use (see stat(5)), only
one client can have the file open at any time. That is,
after such a file has been opened, further opens will fail
until fid has been clunked.
Initial attempt at implementing directory locking using this method was
not successful because badger seems to be opening the directory multiple
times (at least while running the test suite). As a workaround, we lock
the pid lock file instead of the directory itself, same as the windows
implementation.
Co-authored-by: Ibrahim Jarif <[email protected]>
(cherry picked from commit 7b076d6874)
Co-authored-by: Fazlul Shahriar <[email protected]>
41 lines
1.3 KiB
Go
41 lines
1.3 KiB
Go
/*
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* Copyright 2020 Dgraph Labs, Inc. and Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package y
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import (
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"os"
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"syscall"
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)
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// Mmap uses the mmap system call to memory-map a file. If writable is true,
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// memory protection of the pages is set so that they may be written to as well.
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func mmap(fd *os.File, writable bool, size int64) ([]byte, error) {
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return nil, syscall.EPLAN9
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}
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// Munmap unmaps a previously mapped slice.
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func munmap(b []byte) error {
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return syscall.EPLAN9
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}
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// Madvise uses the madvise system call to give advise about the use of memory
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// when using a slice that is memory-mapped to a file. Set the readahead flag to
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// false if page references are expected in random order.
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func madvise(b []byte, readahead bool) error {
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return syscall.EPLAN9
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}
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