Golang Flock_t.Type示例

示例#1

文件： bolt_unix_solaris.go 项目： cdupuis/strava

// flock acquires an advisory lock on a file descriptor.
func flock(f *os.File, exclusive bool, timeout time.Duration) error {
	var t time.Time
	for {
		// If we're beyond our timeout then return an error.
		// This can only occur after we've attempted a flock once.
		if t.IsZero() {
			t = time.Now()
		} else if timeout > 0 && time.Since(t) > timeout {
			return ErrTimeout
		}
		var lock syscall.Flock_t
		lock.Start = 0
		lock.Len = 0
		lock.Pid = 0
		lock.Whence = 0
		lock.Pid = 0
		if exclusive {
			lock.Type = syscall.F_WRLCK
		} else {
			lock.Type = syscall.F_RDLCK
		}
		err := syscall.FcntlFlock(f.Fd(), syscall.F_SETLK, &lock)
		if err == nil {
			return nil
		} else if err != syscall.EAGAIN {
			return err
		}

		// Wait for a bit and try again.
		time.Sleep(50 * time.Millisecond)
	}
}

示例#2

文件： file_storage_solaris.go 项目： RMeharg/prometheus

func setFileLock(f *os.File, readOnly, lock bool) error {
	flock := syscall.Flock_t{
		Type:   syscall.F_UNLCK,
		Start:  0,
		Len:    0,
		Whence: 1,
	}
	if lock {
		if readOnly {
			flock.Type = syscall.F_RDLCK
		} else {
			flock.Type = syscall.F_WRLCK
		}
	}
	return syscall.FcntlFlock(f.Fd(), syscall.F_SETLK, &flock)
}

示例#3

文件： bolt_unix_solaris.go 项目： cdupuis/strava

// funlock releases an advisory lock on a file descriptor.
func funlock(f *os.File) error {
	var lock syscall.Flock_t
	lock.Start = 0
	lock.Len = 0
	lock.Type = syscall.F_UNLCK
	lock.Whence = 0
	return syscall.FcntlFlock(uintptr(f.Fd()), syscall.F_SETLK, &lock)
}

示例#4

文件： safe_freebsd.go 项目： HarryBird/go-gnulib

// Unlock an open file. Unlocking errors are ignored.
func Unlock(file *os.File, lk *syscall.Flock_t) error {
	if lk == nil || file == nil {
		return fmt.Errorf("file or lock are nil file: %s lk: %v", file.Name(), lk)
	}

	lk.Type = syscall.F_UNLCK
	return syscall.FcntlFlock(file.Fd(), syscall.F_SETLK, lk)
}

示例#5

文件： lock_solaris.go 项目： CNDonny/scope

// Lock acquires exclusivity on the lock without blocking
func (l *lock) Lock() error {
	var lock syscall.Flock_t
	lock.Start = 0
	lock.Len = 0
	lock.Type = syscall.F_WRLCK
	lock.Whence = 0
	lock.Pid = 0
	return syscall.FcntlFlock(uintptr(l.fd), syscall.F_SETLK, &lock)
}

示例#6

文件： flock_solaris.go 项目： hvnsweeting/prometheus

func (l *unixLock) set(lock bool) error {
	flock := syscall.Flock_t{
		Type:   syscall.F_UNLCK,
		Start:  0,
		Len:    0,
		Whence: 1,
	}
	if lock {
		flock.Type = syscall.F_WRLCK
	}
	return syscall.FcntlFlock(l.f.Fd(), syscall.F_SETLK, &flock)
}

示例#7

文件： lock_solaris.go 项目： CNDonny/scope

// Unlock unlocks the lock
func (l *lock) Unlock() error {
	var lock syscall.Flock_t
	lock.Start = 0
	lock.Len = 0
	lock.Type = syscall.F_UNLCK
	lock.Whence = 0
	err := syscall.FcntlFlock(uintptr(l.fd), syscall.F_SETLK, &lock)
	if err != nil && err == syscall.EAGAIN {
		return ErrLocked
	}
	return err
}

示例#8

文件： lock_solaris.go 项目： CliffYuan/etcd

func LockFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
	var lock syscall.Flock_t
	lock.Start = 0
	lock.Len = 0
	lock.Pid = 0
	lock.Type = syscall.F_WRLCK
	lock.Whence = 0
	f, err := os.OpenFile(path, flag, perm)
	if err != nil {
		return nil, err
	}
	if err = syscall.FcntlFlock(f.Fd(), syscall.F_SETLKW, &lock); err != nil {
		f.Close()
		return nil, err
	}
	return &LockedFile{f}, nil
}