// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build aix || darwin

package runtime_test

import (
	"runtime"
	"syscall"
	"testing"
)

func TestSetNonblock(t *testing.T) {
	t.Parallel()

	r, w, errno := runtime.Pipe()
	if errno != 0 {
		t.Fatal(syscall.Errno(errno))
	}
	defer func() {

// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime_test

import (
	"runtime/internal/startlinetest"
	"testing"
)

// TestStartLineAsm tests the start line metadata of an assembly function. This
// is only tested on amd64 to avoid the need for a proliferation of per-arch
// copies of this function.

// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build unix

package runtime_test

import (
	"runtime"
	"syscall"
	"testing"
)

func TestSyscallFlagAlignment(t *testing.T) {
	// TODO(mknyszek): Check other flags.
	check := func(name string, got, want int) {
		if got != want {

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime_test

import (
	"math"
	"runtime"
	"testing"
)

func TestFastLog2(t *testing.T) {
	// Compute the euclidean distance between math.Log2 and the FastLog2
	// implementation over the range of interest for heap sampling.
	const randomBitCount = 26
	var e float64

// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime_test

import (
	"runtime"
	"sync"
	"testing"
)

var wg sync.WaitGroup

func init() {
	runtime.NetpollGenericInit()
}

func BenchmarkNetpollBreak(b *testing.B) {
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		for j := 0; j < 10; j++ {

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// The file contains tests that cannot run under race detector for some reason.
//
//go:build !race

package runtime_test

import (
	"runtime"
	"testing"
)

// Syscall tests split stack between Entersyscall and Exitsyscall under race detector.
func BenchmarkSyscall(b *testing.B) {
	benchmarkSyscall(b, 0, 1)
}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// The file contains tests that cannot run under race detector for some reason.
//
//go:build !race

package runtime_test

import (
	"internal/abi"
	"runtime"
	"testing"
	"time"
	"unsafe"
)

var newOSProcDone bool

//go:nosplit
func newOSProcCreated() {
	newOSProcDone = true
}

// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime_test

import (
	"reflect"
	"runtime"
	"testing"
	"unsafe"
)

// Assert that the size of important structures do not change unexpectedly.

func TestSizeof(t *testing.T) {
	const _64bit = unsafe.Sizeof(uintptr(0)) == 8
	var tests = []struct {

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime_test

import (
	"runtime"
	"syscall"
	"testing"
)

func TestFixedGOROOT(t *testing.T) {
	// Restore both the real GOROOT environment variable, and runtime's copies:
	if orig, ok := syscall.Getenv("GOROOT"); ok {
		defer syscall.Setenv("GOROOT", orig)
	} else {

// We need a fast system call to provoke the race,
// and Close(-1) is nearly universally fast.

//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || plan9

package runtime_test

import (
	"runtime"
	"sync"
	"sync/atomic"
	"syscall"
	"testing"
)

func TestGoroutineProfile(t *testing.T) {
	// GoroutineProfile used to use the wrong starting sp for