mp := acquirem()
		if gp1.goroutineProfiled.CompareAndSwap(goroutineProfileAbsent, goroutineProfileInProgress) {
			doRecordGoroutineProfile(gp1, pcbuf)
			gp1.goroutineProfiled.Store(goroutineProfileSatisfied)
		}
		releasem(mp)
	}
}

// doRecordGoroutineProfile writes gp1's call stack and labels to an in-progress
// goroutine profile. Preemption is disabled.
//