}

	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.
//

	var total uint64
	for _, ns := range pauses {
		total += ns
	}
	// ns/op for this benchmark is average STW time.
	b.ReportMetric(float64(total)/float64(b.N), "ns/op")
	b.ReportMetric(float64(pauses[len(pauses)*95/100]), "p95-ns/STW")
	b.ReportMetric(float64(pauses[len(pauses)*50/100]), "p50-ns/STW")
}

func BenchmarkPoolExpensiveNew(b *testing.B) {
	// Populate a pool with items that are expensive to construct

	traceEvGoStatus            // goroutine status at the start of a generation [timestamp, goroutine ID, M ID, status]

	// STW.
	traceEvSTWBegin // STW start [timestamp, kind]
	traceEvSTWEnd   // STW done [timestamp]

	// GC events.
	traceEvGCActive           // GC active [timestamp, seq]
	traceEvGCBegin            // GC start [timestamp, seq, stack ID]

var (
	allPoolsMu Mutex

	// allPools is the set of pools that have non-empty primary
	// caches. Protected by either 1) allPoolsMu and pinning or 2)
	// STW.
	allPools []*Pool

	// oldPools is the set of pools that may have non-empty victim
	// caches. Protected by STW.
	oldPools []*Pool
)

func init() {
	runtime_registerPoolCleanup(poolCleanup)
}

func indexLocal(l unsafe.Pointer, i int) *poolLocal {

	for i := 0; i < res.Events.Len(); i++ {
		ev := res.Events.Ptr(i)
		if ver >= 21 {
			if ev.Type == EvSTWStart && res.Strings[ev.Args[0]] == "unknown" {
				t.Errorf("found unknown STW event; update stwReasonStrings?")
			}
		}
	}
}

func TestBuckets(t *testing.T) {
	var evs Events

	const N = eventsBucketSize*3 + 123
	for i := 0; i < N; i++ {
		evs.append(Event{Ts: Timestamp(i)})

// license that can be found in the LICENSE file.

package runtime

import (
	"internal/abi"
	"internal/goarch"
	"internal/stringslite"
	"unsafe"
)

// May run during STW, so write barriers are not allowed.
//
//go:nowritebarrierrec
func sighandler(_ureg *ureg, note *byte, gp *g) int {
	gsignal := getg()
	mp := gsignal.m

	var t sigTabT
	var docrash bool
	var sig int