// Find out that stack size for our own stack guard.
	if pthread_attr_getstacksize(&attr, &stacksize) != 0 {
		writeErrStr(failthreadcreate)
		exit(1)
	}
	g0.stack.hi = stacksize // for mstart
	memstats.stacks_sys.add(int64(stacksize))

	// Tell the pthread library we won't join with this thread.
	if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 {
		writeErrStr(failthreadcreate)
		exit(1)
	}

	if change > 0 && headroom <= uint64(change) {
		l.overflow += uint64(change) - headroom
		l.bucket.fill = l.bucket.capacity
		if !enabled {
			l.enabled.Store(true)
			l.lastEnabledCycle.Store(memstats.numgc + 1)
		}
		return
	}

	// Handle non-limiting cases.
	if change < 0 && l.bucket.fill <= uint64(-change) {
		// Bucket emptied.
		l.bucket.fill = 0
	} else {
		// All other cases.

		throw("newosproc")
	}
}

// Version of newosproc that doesn't require a valid G.
//
//go:nosplit
func newosproc0(stacksize uintptr, fn unsafe.Pointer) {
	stack := sysAlloc(stacksize, &memstats.stacks_sys)
	if stack == nil {
		writeErrStr(failallocatestack)
		exit(1)
	}
	// This code "knows" it's being called once from the library
	// initialization code, and so it's using the static m0 for the

		if err != nil {
			log.Fatalf("%v", err)
		}
		AtExit(func() {
			// Profile all outstanding allocations.
			runtime.GC()
			// compilebench parses the memory profile to extract memstats,
			// which are only written in the legacy pprof format.
			// See golang.org/issue/18641 and runtime/pprof/pprof.go:writeHeap.
			const writeLegacyFormat = 1

func TestReadMIMEHeaderAllocations(t *testing.T) {
	var totalAlloc uint64
	const count = 200
	for i := 0; i < count; i++ {
		r := reader("A: b\r\n\r\n" + strings.Repeat("\n", 4096))
		var m1, m2 runtime.MemStats
		runtime.ReadMemStats(&m1)
		_, err := r.ReadMIMEHeader()
		if err != nil {
			t.Fatalf("ReadMIMEHeader: %v", err)
		}
		runtime.ReadMemStats(&m2)
		totalAlloc += m2.TotalAlloc - m1.TotalAlloc
	}

	}
	if stackDebug >= 1 {
		print("stackalloc ", n, "\n")
	}

	if debug.efence != 0 || stackFromSystem != 0 {
		n = uint32(alignUp(uintptr(n), physPageSize))
		v := sysAlloc(uintptr(n), &memstats.stacks_sys)
		if v == nil {
			throw("out of memory (stackalloc)")
		}
		return stack{uintptr(v), uintptr(v) + uintptr(n)}
	}

	// Small stacks are allocated with a fixed-size free-list allocator.

pkg plugin, type Symbol interface {}
pkg reflect, func Swapper(interface{}) func(int, int)
pkg runtime, func MutexProfile([]BlockProfileRecord) (int, bool)
pkg runtime, func SetMutexProfileFraction(int) int
pkg runtime, type MemStats struct, NumForcedGC uint32
pkg sort, func Slice(interface{}, func(int, int) bool)
pkg sort, func SliceIsSorted(interface{}, func(int, int) bool) bool
pkg sort, func SliceStable(interface{}, func(int, int) bool)

# CL 144020043 reflect: add Type.Comparable, Russ Cox <******@****.***>
pkg reflect, type Type interface, Comparable() bool

# CL 153670043 runtime: add PauseEnd array to MemStats and GCStats, Jens Frederich <******@****.***>
pkg runtime, type MemStats struct, PauseEnd [256]uint64
pkg runtime/debug, type GCStats struct, PauseEnd []time.Time

# CL 136710045 sync/atomic: add Value, Dmitriy Vyukov <******@****.***>

	})
}

func TestTimerGC(t *testing.T) {
	run := func(t *testing.T, what string, f func()) {
		t.Helper()
		t.Run(what, func(t *testing.T) {
			t.Helper()
			const N = 1e4
			var stats runtime.MemStats
			runtime.GC()
			runtime.GC()
			runtime.GC()
			runtime.ReadMemStats(&stats)
			before := int64(stats.Mallocs - stats.Frees)

			for j := 0; j < N; j++ {
				f()
			}

			runtime.GC()

		if prod != r.prod {
			t.Errorf("#%d: got %s; want %s", i, prod, r.prod)
		}
	}
}

// allocBytes returns the number of bytes allocated by invoking f.
func allocBytes(f func()) uint64 {
	var stats runtime.MemStats
	runtime.ReadMemStats(&stats)
	t := stats.TotalAlloc
	f()
	runtime.ReadMemStats(&stats)
	return stats.TotalAlloc - t
}

// TestMulUnbalanced tests that multiplying numbers of different lengths