### Concurrency and Burgers

This idea of **asynchronous** code described above is also sometimes called **"concurrency"**. It is different from **"parallelism"**.

**Concurrency** and **parallelism** both relate to "different things happening more or less at the same time".

But the details between *concurrency* and *parallelism* are quite different.

To see the difference, imagine the following story about burgers:

		}
	}
	if ref.Path == "" && u.Opaque != "" {
		url.Opaque = u.Opaque
		url.User = nil
		url.Host = ""
		url.Path = ""
		return &url
	}
	// The "abs_path" or "rel_path" cases.
	url.Host = u.Host
	url.User = u.User
	url.setPath(resolvePath(u.EscapedPath(), ref.EscapedPath()))
	return &url
}

// Query parses RawQuery and returns the corresponding values.

	secretboxTransformerPrefixV1 = "k8s:enc:secretbox:v1:"
	kmsTransformerPrefixV1       = "k8s:enc:kms:v1:"
	kmsTransformerPrefixV2       = "k8s:enc:kms:v2:"

	// these constants relate to how the KMS v2 plugin status poll logic
	// and the DEK/seed generation logic behave.  In particular, the positive
	// interval and max TTL are closely related as the difference between

		}

		// Sometimes we see WSAECONNRESET and ERROR_NETNAME_DELETED is
		// returned here. These happen if connection reset is received
		// before AcceptEx could complete. These errors relate to new
		// connection, not to AcceptEx, so ignore broken connection and
		// try AcceptEx again for more connections.
		errno, ok := err.(syscall.Errno)
		if !ok {
			return syscall.InvalidHandle, nil, 0, errcall, err

LOG_LEVEL=${LOG_LEVEL:-3}
# Use to increase verbosity on particular files, e.g. LOG_SPEC=token_controller*=5,other_controller*=4
LOG_SPEC=${LOG_SPEC:-""}
LOG_DIR=${LOG_DIR:-"/tmp"}
TMP_DIR=${TMP_DIR:-$(kube::realpath "$(mktemp -d -t "$(basename "$0").XXXXXX")")}
CONTAINER_RUNTIME_ENDPOINT=${CONTAINER_RUNTIME_ENDPOINT:-"unix:///run/containerd/containerd.sock"}
RUNTIME_REQUEST_TIMEOUT=${RUNTIME_REQUEST_TIMEOUT:-"2m"}

	// close to the L1 cache line width on many systems. Also, a value of 3 fits 4 tree
	// levels perfectly into the 21-bit pallocBits summary field at the root level.
	//
	// The following equation explains how each of the constants relate:
	// summaryL0Bits + (summaryLevels-1)*summaryLevelBits + logPallocChunkBytes = heapAddrBits
	//
	// summaryLevels is an architecture-dependent value defined in mpagealloc_*.go.
	summaryLevelBits = 3

// FieldManager is required for apply requests.
// ApplyOptions is equivalent to PatchOptions. It is provided as a convenience with documentation
// that speaks specifically to how the options fields relate to apply.
message ApplyOptions {
  // When present, indicates that modifications should not be
  // persisted. An invalid or unrecognized dryRun directive will
  // result in an error response and no further processing of the

// FieldManager is required for apply requests.
// ApplyOptions is equivalent to PatchOptions. It is provided as a convenience with documentation
// that speaks specifically to how the options fields relate to apply.
message ApplyOptions {
  // When present, indicates that modifications should not be
  // persisted. An invalid or unrecognized dryRun directive will
  // result in an error response and no further processing of the

	c := ts.Client()

	cases := []struct {
		reqPath string
		path    string // If empty we want a 404.
		rawPath string
	}{
		{"/foo/bar/qux", "/qux", ""},
		{"/foo/bar%2Fqux", "/qux", "%2Fqux"},
		{"/foo%2Fbar/qux", "", ""}, // Escaped prefix does not match.
		{"/bar", "", ""},           // No prefix match.
	}
	for _, tc := range cases {
		t.Run(tc.reqPath, func(t *testing.T) {

// FieldManager is required for apply requests.
// ApplyOptions is equivalent to PatchOptions. It is provided as a convenience with documentation
// that speaks specifically to how the options fields relate to apply.
type ApplyOptions struct {
	TypeMeta `json:",inline"`

	// When present, indicates that modifications should not be
	// persisted. An invalid or unrecognized dryRun directive will