return 0x7fffffff
	}
	if rem != nil {
		*rem = int32(v)
	}
	return res
}

// Helpers for Go. Must be NOSPLIT, must only call NOSPLIT functions, and must not block.

//go:nosplit
func acquirem() *m {
	gp := getg()
	gp.m.locks++
	return gp.m
}

//go:nosplit
func releasem(mp *m) {
	gp := getg()
	mp.locks--
	if mp.locks == 0 && gp.preempt {

}

var alwaysFalse bool
var escapeSink any

func Escape[T any](x T) T {
	if alwaysFalse {
		escapeSink = x
	}
	return x
}

// Acquirem blocks preemption.
func Acquirem() {
	acquirem()
}

func Releasem() {
	releasem(getg().m)
}

var Timediv = timediv

type PIController struct {
	piController
}

	// tend to have the same recursive functions over and over,
	// or repetitive stacks between goroutines.
	var checkVal int32
	var checkPC uintptr
	ck := pcvalueCacheKey(targetpc)
	{
		mp := acquirem()
		cache := &mp.pcvalueCache
		// The cache can be used by the signal handler on this M. Avoid
		// re-entrant use of the cache. The signal handler can also write inUse,

	// has marked as idle with no timers, in which case the timer could
	// go unnoticed until long after t.when.
	// Calling acquirem instead of using getg().m makes sure that
	// we end up locking and inserting into the current P's timers.
	mp := acquirem()
	ts := &mp.p.ptr().timers
	ts.lock()
	ts.cleanHead()
	t.lock()
	t.trace("maybeAdd")
	when := int64(0)
	wake := false
	if t.needsAdd() {

//
//go:nosplit
func traceAcquireEnabled() traceLocker {
	// Any time we acquire a traceLocker, we may flush a trace buffer. But
	// buffer flushes are rare. Record the lock edge even if it doesn't happen
	// this time.
	lockRankMayTraceFlush()

	// Prevent preemption.
	mp := acquirem()

	// Acquire the trace seqlock. This prevents traceAdvance from moving forward

	restore = false
}

func unwindm(restore *bool) {
	if *restore {
		// Restore sp saved by cgocallback during
		// unwind of g's stack (see comment at top of file).
		mp := acquirem()
		sched := &mp.g0.sched
		sched.sp = *(*uintptr)(unsafe.Pointer(sched.sp + alignUp(sys.MinFrameSize, sys.StackAlign)))

		// Do the accounting that cgocall will not have a chance to do
		// during an unwind.
		//

	noPLock mutex
}

// acquire returns a heapStatsDelta to be updated. In effect,
// it acquires the shard for writing. release must be called
// as soon as the relevant deltas are updated.
//
// The returned heapStatsDelta must be updated atomically.
//
// The caller's P must not change between acquire and
// release. This also means that the caller should not
// acquire a P or release its P in between. A P also must

   */
  @CanIgnoreReturnValue
  public double acquire() {
    return acquire(1);
  }

  /**
   * Acquires the given number of permits from this {@code RateLimiter}, blocking until the request
   * can be granted. Tells the amount of time slept, if any.
   *
   * @param permits the number of permits to acquire
   * @return time spent sleeping to enforce rate, in seconds; 0.0 if not rate-limited

   */
  @CanIgnoreReturnValue
  public double acquire() {
    return acquire(1);
  }

  /**
   * Acquires the given number of permits from this {@code RateLimiter}, blocking until the request
   * can be granted. Tells the amount of time slept, if any.
   *
   * @param permits the number of permits to acquire
   * @return time spent sleeping to enforce rate, in seconds; 0.0 if not rate-limited

    def "close when lock has never been acquired"() {
        when:
        cacheAccess.close()

        then:
        0 * _
    }

    def "acquires lock then runs action and retains lock on completion"() {
        def action = Mock(Supplier)
        def lock = Mock(FileLock)

        when: