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41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
//go:build (freebsd || openbsd || netbsd || dragonfly || illumos || sqlite3_flock) && !sqlite3_nosys
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package vfs
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import (
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"os"
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"time"
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"golang.org/x/sys/unix"
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)
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func osUnlock(file *os.File, start, len int64) _ErrorCode {
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if start == 0 && len == 0 {
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err := unix.Flock(int(file.Fd()), unix.LOCK_UN)
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if err != nil {
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return _IOERR_UNLOCK
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}
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}
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return _OK
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}
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func osLock(file *os.File, how int, def _ErrorCode) _ErrorCode {
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err := unix.Flock(int(file.Fd()), how)
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return osLockErrorCode(err, def)
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}
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func osReadLock(file *os.File, _ /*start*/, _ /*len*/ int64, _ /*timeout*/ time.Duration) _ErrorCode {
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return osLock(file, unix.LOCK_SH|unix.LOCK_NB, _IOERR_RDLOCK)
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}
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func osWriteLock(file *os.File, _ /*start*/, _ /*len*/ int64, _ /*timeout*/ time.Duration) _ErrorCode {
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rc := osLock(file, unix.LOCK_EX|unix.LOCK_NB, _IOERR_LOCK)
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if rc == _BUSY {
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// The documentation states the lock is upgraded by releasing the previous lock,
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// then acquiring the new lock.
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// This is a race, so return BUSY_SNAPSHOT to ensure the transaction is aborted.
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return _BUSY_SNAPSHOT
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}
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return rc
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}
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