*
     * <p>This method is re-entrant, so that an action can call back into this method.</p>
     *
     * <p>Note: this method differs from {@link #withFileLock(Supplier)} in that this method also blocks other threads from this process and all threads from other processes from accessing the cache.</p>
     */
    <T> T useCache(Supplier<? extends T> action);

    /**

#define SEED(off, reg, XR) \
	MOVL (4*off)(AX), reg; \
	REPLREG(reg, XR) \

// block runs 4 ChaCha8 block transformations in the four stripes of the X registers.

// func block(seed *[8]uint32, blocks *[16][4]uint32, counter uint32)
TEXT ·block<ABIInternal>(SB), NOSPLIT, $16
	// seed in AX
	// blocks in BX
	// counter in CX

	// Load initial constants into top row.
	REPL(0x61707865, X0)

			}
			// Ensure that non-blocking receive does not block.
			select {
			case _ = <-c:
				t.Fatalf("chan[%d]: receive from empty chan", chanCap)
			default:
			}
			select {
			case _, _ = <-c:
				t.Fatalf("chan[%d]: receive from empty chan", chanCap)
			default:
			}
			c <- 0
			c <- 0
		}

		{
			// Ensure that send to full chan blocks.
			c := make(chan int, chanCap)

//   - Regular IPv6: 1111:2222:3333:4444:5555:6666:7777:8888
//   - IPv6 with many leading zeros: 00000001:0000002:0000003:0000004:0000005:0000006:0000007:0000008
//   - IPv6 with zero blocks elided: 1111:2222::7777:8888
//   - IPv6 with trailing 32 bits expressed as IPv4: 1111:2222:3333:4444:5555:6666:77.77.88.88
//
// It does not process the following IP address forms, which have been

	})
}

// quicWaitForSignal notifies the QUICConn that handshake progress is blocked,
// and waits for a signal that the handshake should proceed.
//
// The handshake may become blocked waiting for handshake bytes
// or for the user to provide transport parameters.
func (c *Conn) quicWaitForSignal() error {
	// Drop the handshake mutex while blocked to allow the user
	// to call ConnectionState before the handshake completes.

	pd := pollcache.alloc()
	lock(&pd.lock)
	wg := pd.wg.Load()
	if wg != pdNil && wg != pdReady {
		throw("runtime: blocked write on free polldesc")
	}
	rg := pd.rg.Load()
	if rg != pdNil && rg != pdReady {
		throw("runtime: blocked read on free polldesc")
	}
	pd.fd = fd
	if pd.fdseq.Load() == 0 {
		// The value 0 is special in setEventErr, so don't use it.
		pd.fdseq.Store(1)
	}

	state atomic.Uint64 // high 32 bits are counter, low 32 bits are waiter count.
	sema  uint32
}

// Add adds delta, which may be negative, to the [WaitGroup] counter.
// If the counter becomes zero, all goroutines blocked on [WaitGroup.Wait] are released.
// If the counter goes negative, Add panics.
//
// Note that calls with a positive delta that occur when the counter is zero

    /**
     * Receives a message from the client. Does not include any stdin messages. Blocks until a message is received or the connection is closed or the timeout is reached.
     *
     * @return null On end of connection or timeout.
     */
    Object receive(long timeoutValue, TimeUnit timeoutUnits);

    /**
     * Blocks until all handlers have been notified and any queued messages have been dispatched to the client.
     */

	Atim     StTimespec_t
	Mtim     StTimespec_t
	Ctim     StTimespec_t
	Blksize  int64
	Blocks   int64
	Vfstype  int32
	Vfs      uint32
	Type     uint32
	Gen      uint32
	Reserved [9]uint32
	Padto_ll uint32
	Size     int64
}

type Statfs_t struct {
	Version   int32
	Type      int32
	Bsize     uint64
	Blocks    uint64
	Bfree     uint64
	Bavail    uint64
	Files     uint64
	Ffree     uint64

            is KtStringTemplateEntry ->
                parent.expression == child

            // Catch blocks are used if the parent-try uses the catch block
            is KtCatchClause ->
                doesParentUseChild(parent.parent, parent)

            // Finally blocks are never used
            is KtFinallySection ->
                false

            is KtPropertyDelegate ->