-buildmode mode
		Set build mode (default exe).
	-c
		Dump call graphs.
	-compressdwarf
		Compress DWARF if possible (default true).
	-cpuprofile file
		Write CPU profile to file.
	-d
		Disable generation of dynamic executables.
		The emitted code is the same in either case; the option
		controls only whether a dynamic header is included.
		The dynamic header is on by default, even without any

// See the WaitGroup example.
func (wg *WaitGroup) Add(delta int) {
	if race.Enabled {
		if delta < 0 {
			// Synchronize decrements with Wait.
			race.ReleaseMerge(unsafe.Pointer(wg))
		}
		race.Disable()
		defer race.Enable()
	}
	state := wg.state.Add(uint64(delta) << 32)
	v := int32(state >> 32)
	w := uint32(state)
	if race.Enabled && delta > 0 && v == int32(delta) {

	}

	if debug.harddecommit > 0 {
		p, err := mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)
		if p != v || err != 0 {
			throw("runtime: cannot disable permissions in address space")
		}
	}
}

func sysUsedOS(v unsafe.Pointer, n uintptr) {
	if debug.harddecommit > 0 {
		p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)

	st.ss_sp = (char*)base;
	st.ss_flags = 0;
	st.ss_size = CSIGSTKSZ;
	if (sigaltstack(&st, &ost) < 0) {
		perror("sigaltstack failed");
		abort();
	}

	// Call Go.
	SigStackCallback();

	// Disable signal stack and protect it so we can detect reuse.
	if (ost.ss_flags & SS_DISABLE) {
		// Darwin libsystem has a bug where it checks ss_size
		// even if SS_DISABLE is set. (The kernel gets it right.)
		ost.ss_size = CSIGSTKSZ;

// panic.
//
// The fallback behavior can be forced on all platforms, even when there is a
// system certificate pool, by setting GODEBUG=x509usefallbackroots=1 (note that
// on Windows and macOS this will disable usage of the platform verification
// APIs and cause the pure Go verifier to be used). Setting
// x509usefallbackroots=1 without calling SetFallbackRoots has no effect.
func SetFallbackRoots(roots *CertPool) {
	if roots == nil {

//
//go:build !race

package sync_test

import (
	"runtime"
	"runtime/debug"
	"slices"
	. "sync"
	"sync/atomic"
	"testing"
	"time"
)

func TestPool(t *testing.T) {
	// disable GC so we can control when it happens.
	defer debug.SetGCPercent(debug.SetGCPercent(-1))
	var p Pool
	if p.Get() != nil {
		t.Fatal("expected empty")
	}

	// Make sure that the goroutine doesn't migrate to another P

// The upstream pprof command implements the same functionality
// using the github.com/chzyer/readline package.
type readlineUI struct {
	term *term.Terminal
}

func newReadlineUI() driver.UI {
	// disable readline UI in dumb terminal. (golang.org/issue/26254)
	if v := strings.ToLower(os.Getenv("TERM")); v == "" || v == "dumb" {
		return nil
	}
	// test if we can use term.ReadLine
	// that assumes operation in the raw mode.

	RunDespiteErrors: true,
	Run:              run,
}

func run(pass *analysis.Pass) (any, error) {
	// Prior to go1.22, versions.FileVersion returns only the
	// toolchain version, which is of no use to us, so
	// disable this analyzer on earlier versions.
	if !slicesContains(build.Default.ReleaseTags, "go1.22") {
		return nil, nil
	}

	// Don't report diagnostics for modules marked before go1.21,

		t.Errorf("unexpected \"unexpected SPWRITE\" in traceback:\n%s", tb)
	}
}

func init() {
	if len(os.Args) >= 2 && os.Args[1] == "testPanicSystemstackInternal" {
		// Complete any in-flight GCs and disable future ones. We're going to
		// block goroutines on runtime locks, which aren't ever preemptible for the
		// GC to scan them.
		runtime.GC()
		debug.SetGCPercent(-1)

	}
	vp := (*efaceWords)(unsafe.Pointer(v))
	vlp := (*efaceWords)(unsafe.Pointer(&val))
	for {
		typ := LoadPointer(&vp.typ)
		if typ == nil {
			// Attempt to start first store.
			// Disable preemption so that other goroutines can use
			// active spin wait to wait for completion.
			runtime_procPin()
			if !CompareAndSwapPointer(&vp.typ, nil, unsafe.Pointer(&firstStoreInProgress)) {
				runtime_procUnpin()