}

        // didn't see it, trying to put it instead...
        Dummy sneaky = map.putIfAbsent(sample, Dummy.VALUE);
        if (sneaky == null) {
          return sample;
        } else {
          /* Someone beat us to it! Trying again...
           *
           * Technically this loop not guaranteed to terminate, so theoretically (extremely

	*concurrent.HashTrieMap[T, weak.Pointer[T]]
	cloneSeq
}

func addUniqueMap[T comparable](typ *abi.Type) *uniqueMap[T] {
	// Create a map for T and try to register it. We could
	// race with someone else, but that's fine; it's one
	// small, stray allocation. The number of allocations
	// this can create is bounded by a small constant.
	m := &uniqueMap[T]{
		HashTrieMap: concurrent.NewHashTrieMap[T, weak.Pointer[T]](),

			logger.Info("getBucket: cached bucket %s does not match this bucket %s", b.bucket, bucket)
			debug.PrintStack()
		}
		return b
	}

	m.mu.RUnlock()
	m.mu.Lock()
	defer m.mu.Unlock()
	// See if someone else fetched it while we waited for the lock.
	b, ok = m.buckets[bucket]
	if ok {
		if b.bucket != bucket {
			logger.Info("getBucket: newly cached bucket %s does not match this bucket %s", b.bucket, bucket)

	//
	// We have the guarantees:
	// - in normal cases, the interval is 5 minutes.
	// - in failover, the interval is >5m and <10m
	//
	// FAQ:
	// - What if time is not accurate? We don't care as long as someone did the compaction. Atomicity is ensured using
	//   etcd API.
	// - What happened under heavy load scenarios? Initially, each apiserver will do only one compaction

When you _build_ a library, you are effectively on the _producer_ side: you are producing _artifacts_ which are going to be _consumed_ by someone else, the _consumer_.

A lot of problems with traditional build systems is that they don't make the difference between a producer and a consumer.

A _consumer_ needs to be understood in the large sense:

				timer.end()
				return
			}
			i = 0
		}
		if i < spin {
			procyield(active_spin_cnt)
		} else if i < spin+passive_spin {
			osyield()
		} else {
			// Someone else has it.
			// l->waitm points to a linked list of M's waiting
			// for this lock, chained through m->nextwaitm.
			// Queue this M.
			for {
				gp.m.nextwaitm = muintptr(v &^ locked)

func (ln *UnixListener) close() error {
	// The operating system doesn't clean up
	// the file that announcing created, so
	// we have to clean it up ourselves.
	// There's a race here--we can't know for
	// sure whether someone else has come along
	// and replaced our socket name already--
	// but this sequence (remove then close)
	// is at least compatible with the auto-remove
	// sequence in ListenUnix. It's only non-Go

	if apierrors.IsAlreadyExists(err) {
		// If we're racing to init and someone else already created it, re-fetch
		return coreClient.ServiceAccounts(namespace).Get(context.TODO(), name, metav1.GetOptions{})
	}
	return sa, err

			// So get off the way.
			if old>>mutexWaiterShift == 0 || old&(mutexLocked|mutexWoken|mutexStarving) != 0 {
				return
			}
			// Grab the right to wake someone.
			new = (old - 1<<mutexWaiterShift) | mutexWoken
			if atomic.CompareAndSwapInt32(&m.state, old, new) {
				runtime_Semrelease(&m.sema, false, 1)
				return
			}
			old = m.state
		}
	} else {

# OpenAPI Callbacks

You could create an API with a *path operation* that could trigger a request to an *external API* created by someone else (probably the same developer that would be *using* your API).