Dmitri Shuralyov <******@****.***> 1716392409 -0400

// File locking support for Plan 9. This uses fdMutex from the
// internal/poll package.

// incref adds a reference to the file. It returns an error if the file
// is already closed. This method is on File so that we can incorporate
// a nil test.
func (f *File) incref(op string) (err error) {
	if f == nil {
		return ErrInvalid
	}
	if !f.fdmu.Incref() {
		err = ErrClosed
		if op != "" {
			err = &PathError{Op: op, Path: f.name, Err: err}

// limitations under the License.

/*
tree.go contains functions for traversing and updating a tree constructed from yaml or json.Unmarshal.
Nodes in such trees have the form map[interface{}]interface{} or map[interface{}][]interface{}.
For some tree updates, like delete or append, it's necessary to have access to the parent node. PathContext is a

	ensurePanics(func() { mu.RWUnlock(false) })

	ensurePanics(func() { mu.Incref(); mu.Decref(); mu.Decref() })
	ensurePanics(func() { mu.RWLock(true); mu.RWUnlock(true); mu.RWUnlock(true) })
	ensurePanics(func() { mu.RWLock(false); mu.RWUnlock(false); mu.RWUnlock(false) })

	// ensure that it's still not broken
	mu.Incref()
	mu.Decref()
	mu.RWLock(true)
	mu.RWUnlock(true)
	mu.RWLock(false)

- github.com/getsentry/raven-go: [v0.2.0](https://github.com/getsentry/raven-go/tree/v0.2.0)
- github.com/go-kit/log: [v0.1.0](https://github.com/go-kit/log/tree/v0.1.0)
- github.com/gofrs/uuid: [v4.0.0+incompatible](https://github.com/gofrs/uuid/tree/v4.0.0)
- github.com/josharian/intern: [v1.0.0](https://github.com/josharian/intern/tree/v1.0.0)

// the internal/poll tests can not be in package poll.

package poll

var Consume = consume

type XFDMutex struct {
	fdMutex
}

func (mu *XFDMutex) Incref() bool {
	return mu.incref()
}

func (mu *XFDMutex) IncrefAndClose() bool {
	return mu.increfAndClose()
}

func (mu *XFDMutex) Decref() bool {
	return mu.decref()
}

func (mu *XFDMutex) RWLock(read bool) bool {

Dmitri Shuralyov <******@****.***> 1716392409 -0400

# tag::cli[]
# gradle --quiet intro
# end::cli[]
executable: gradle
args: intro
flags: --quiet

func (fd *FD) Fchdir() error {
	if err := fd.incref(); err != nil {
		return err
	}
	defer fd.decref()
	return syscall.Fchdir(fd.Sysfd)
}

// ReadDirent wraps syscall.ReadDirent.
// We treat this like an ordinary system call rather than a call
// that tries to fill the buffer.
func (fd *FD) ReadDirent(buf []byte) (int, error) {
	if err := fd.incref(); err != nil {
		return 0, err
	}
	defer fd.decref()

// but we still want the locking semantics that fdMutex provides.

// FDMutex is an exported fdMutex, only for Plan 9.
type FDMutex struct {
	fdmu fdMutex
}

func (fdmu *FDMutex) Incref() bool {
	return fdmu.fdmu.incref()
}

func (fdmu *FDMutex) Decref() bool {
	return fdmu.fdmu.decref()
}

func (fdmu *FDMutex) IncrefAndClose() bool {
	return fdmu.fdmu.increfAndClose()
}