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lock_solaris.go
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lock_solaris.go
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//go:build solaris
package file
import (
"os"
"syscall"
"time"
)
// RetryInterval is the interval between retries of a file locking for Solaris.
var RetryInterval = 50 * time.Millisecond
// LockSH places a shared lock on the file. If the file is already locked, waits until the file is released.
func LockSH(fp *os.File) error {
for {
err := TryLockSH(fp)
if err == nil {
break
}
if err != syscall.EAGAIN {
return err
}
time.Sleep(RetryInterval)
}
return nil
}
// LockEX places an exclusive lock on the file. If the file is already locked, waits until the file is released.
func LockEX(fp *os.File) error {
for {
err := TryLockEX(fp)
if err == nil {
break
}
if err != syscall.EAGAIN {
return err
}
time.Sleep(RetryInterval)
}
return nil
}
// TryLockSH places a shared lock on the file. If the file is already locked, returns an error immediately.
func TryLockSH(fp *os.File) error {
var lock syscall.Flock_t
lock.Start = 0
lock.Len = 0
lock.Whence = 0
lock.Pid = int32(os.Getpid())
lock.Type = syscall.F_RDLCK
return syscall.FcntlFlock(uintptr(fp.Fd()), syscall.F_SETLK, &lock)
}
// TryLockEX places an exclusive lock on the file. If the file is already locked, returns an error immediately.
func TryLockEX(fp *os.File) error {
var lock syscall.Flock_t
lock.Start = 0
lock.Len = 0
lock.Whence = 0
lock.Pid = int32(os.Getpid())
lock.Type = syscall.F_WRLCK
return syscall.FcntlFlock(uintptr(fp.Fd()), syscall.F_SETLK, &lock)
}
// Unlock the file.
func Unlock(fp *os.File) error {
var lock syscall.Flock_t
lock.Start = 0
lock.Len = 0
lock.Whence = 0
lock.Type = syscall.F_UNLCK
return syscall.FcntlFlock(uintptr(fp.Fd()), syscall.F_SETLK, &lock)
}