mode      traceviewer.Mode
	startTime time.Duration
	endTime   time.Duration

	// Used if mode != 0.
	focusGoroutine trace.GoID
	goroutines     map[trace.GoID]struct{} // Goroutines to be displayed for goroutine-oriented or task-oriented view. goroutines[0] is the main goroutine.
	tasks          []*trace.UserTaskSummary
}

// setTask sets a task to focus on.

	if err != nil {
		t.Errorf("failed to fetch pre-test goroutines: %v", err)
		return
	}
	existing := map[uint64]struct{}{}
	for _, g := range existingRaw {
		existing[g.id] = struct{}{}
	}
	filter := func(in []*goroutine) []*goroutine {
		res := make([]*goroutine, 0, len(in))
		for _, i := range in {
			if _, f := existing[i.id]; !f {
				// This was not in the goroutines list when the test started
				res = append(res, i)

		}
	}()
	return true
}

// SetLimit limits the number of active goroutines in this group to at most n.
// A negative value indicates no limit.
//
// Any subsequent call to the Go method will block until it can add an active
// goroutine without exceeding the configured limit.
//
// The limit must not be modified while any goroutines in the group are active.
func (g *Group) SetLimit(n int) {
	if n < 0 {

// Tests a many interesting cases (network, syscalls, a little GC, busy goroutines,
// blocked goroutines, LockOSThread, pipes, and GOMAXPROCS).

//go:build ignore

package main

import (
	"log"
	"net"
	"os"
	"runtime"
	"runtime/trace"
	"sync"
	"time"
)

func main() {
	var wg sync.WaitGroup
	done := make(chan bool)

	// Create a goroutine blocked before tracing.
	wg.Add(1)
	go func() {
		<-done

	}
}

// Unlock unlocks m.
// It is a run-time error if m is not locked on entry to Unlock.
//
// A locked [Mutex] is not associated with a particular goroutine.
// It is allowed for one goroutine to lock a Mutex and then
// arrange for another goroutine to unlock it.
func (m *Mutex) Unlock() {
	if race.Enabled {
		_ = m.state
		race.Release(unsafe.Pointer(m))
	}

	// Fast path: drop lock bit.

	"internal/race"
	"sync/atomic"
	"unsafe"
)

// A WaitGroup waits for a collection of goroutines to finish.
// The main goroutine calls [WaitGroup.Add] to set the number of
// goroutines to wait for. Then each of the goroutines
// runs and calls [WaitGroup.Done] when finished. At the same time,
// [WaitGroup.Wait] can be used to block until all goroutines have finished.
//
// A WaitGroup must not be copied after first use.
//

		// goroutines are a new leak from a subsequent test or just the same
		// goroutines from the first leak still hanging around, and we may add a lot
		// of latency waiting for them to exit at the end of each test.
		return
	}

	// We shouldn't be running the leak check for parallel tests, because we might
	// report the goroutines from a test that is still running as a leak from a

		for _, g := range leaked {
			t.Errorf("Leaked goroutine: %v", g)
		}
		return
	}
}

// DetectTestLeak -  snapshots the currently running goroutines and returns a
// function to be run at the end of tests to see whether any
// goroutines leaked.
// Usage: `defer DetectTestLeak(t)()` in beginning line of benchmarks or unit tests.

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

// Tests a many interesting cases (network, syscalls, a little GC, busy goroutines,
// blocked goroutines, LockOSThread, pipes, and GOMAXPROCS).

//go:build ignore

package main

import (
	"bytes"
	"io"
	"log"
	"net"
	"os"
	"runtime"
	"runtime/trace"
	"sync"
	"time"
)

	// Test that there are just the expected number of goroutines
	// running. Specifically, test that the spare M's goroutine
	// doesn't show up.
	if _, ok := checkNumGoroutine("first", 1+baseGoroutines); !ok {
		return
	}

	// Test that the goroutine for a callback from C appears.
	if C.CheckNumGoroutine(); !callbackok {
		return
	}

	// Make sure we're back to the initial goroutines.