}

	lock(&sched.lock)
	ret := int(gomaxprocs)
	unlock(&sched.lock)
	if n <= 0 || n == ret {
		return ret
	}

	stw := stopTheWorldGC(stwGOMAXPROCS)

	// newprocs will be processed by startTheWorld
	newprocs = int32(n)

	startTheWorldGC(stw)
	return ret
}

// NumCPU returns the number of logical CPUs usable by the current process.
//

		if readgstatus(fing) != _Gdead && !isSystemGoroutine(fing, false) {
			doRecordGoroutineProfile(fing, pcbuf)
		}
	}
	startTheWorld(stw)

	// Visit each goroutine that existed as of the startTheWorld call above.
	//
	// New goroutines may not be in this list, but we didn't want to know about
	// them anyway. If they do appear in this list (via reusing a dead goroutine

String id=48
	data="sync.(*WaitGroup).Done"
String id=49
	data="runtime.traceStartReadCPU"
String id=50
	data="/usr/local/google/home/mknyszek/work/go-1/src/runtime/trace2cpu.go"
String id=51
	data="runtime.startTheWorld"
String id=52
	data="/usr/local/google/home/mknyszek/work/go-1/src/runtime/proc.go"
String id=53
	data="runtime/trace.(*Task).End"
String id=54
	data="runtime.traceLocker.Gomaxprocs"
String id=55

	stw := stopTheWorld(stwForTestCountPagesInUse)

	pagesInUse = mheap_.pagesInUse.Load()

	for _, s := range mheap_.allspans {
		if s.state.get() == mSpanInUse {
			counted += s.npages
		}
	}

	startTheWorld(stw)

	return
}

func Fastrand() uint32          { return uint32(rand()) }
func Fastrand64() uint64        { return rand() }
func Fastrandn(n uint32) uint32 { return randn(n) }

			}},
			{trace.EventStateTransition, "Goroutine Running->Waiting", []frame{
				{"time.Sleep", 0},
				{"main.main", 0},
			}},
			{trace.EventMetric, "/sched/gomaxprocs:threads", []frame{
				{"runtime.startTheWorld", 0}, // this is when the current gomaxprocs is logged.
				{"runtime.startTheWorldGC", 0},
				{"runtime.GOMAXPROCS", 0},
				{"main.main", 0},
			}},
		}
		if !stress {

	systemstack(func() {
		// Call readmemstats_m here instead of deeper in
		// writeheapdump_m because we might blow the system stack
		// otherwise.
		readmemstats_m(&m)
		writeheapdump_m(fd, &m)
	})

	startTheWorld(stw)
}

const (
	fieldKindEol       = 0
	fieldKindPtr       = 1
	fieldKindIface     = 2
	fieldKindEface     = 3
	tagEOF             = 0
	tagObject          = 1
	tagOtherRoot       = 2

		casgstatus(gp, _Gwaiting, _Grunning)
	})
	return stopTheWorldContext
}

// startTheWorld undoes the effects of stopTheWorld.
//
// w must be the worldStop returned by stopTheWorld.
func startTheWorld(w worldStop) {
	systemstack(func() { startTheWorldWithSema(0, w) })

	// worldsema must be held over startTheWorldWithSema to ensure

func ReadMemStats(m *MemStats) {
	_ = m.Alloc // nil check test before we switch stacks, see issue 61158
	stw := stopTheWorld(stwReadMemStats)

	systemstack(func() {
		readmemstats_m(m)
	})

	startTheWorld(stw)
}

// doubleCheckReadMemStats controls a double-check mode for ReadMemStats that
// ensures consistency between the values that ReadMemStats is using and the
// runtime-internal stats.

	for _, pp := range allp {
		tl.writer().writeProcStatusForP(pp, pp == tl.mp.p.ptr()).end()
	}
	traceRelease(tl)

	unlock(&sched.sysmonlock)
	startTheWorld(stw)

	traceStartReadCPU()
	traceAdvancer.start()

	semrelease(&traceAdvanceSema)
	return nil
}

// StopTrace stops tracing, if it was previously enabled.

	// continues to use its P, even in _Pgcstop. Transitioning
	// from _Prunning to _Pgcstop causes an M to release its P and
	// park.
	//
	// The P retains its run queue and startTheWorld will restart
	// the scheduler on Ps with non-empty run queues.
	_Pgcstop

	// _Pdead means a P is no longer used (GOMAXPROCS shrank). We
	// reuse Ps if GOMAXPROCS increases. A dead P is mostly