// a target directory.
//
// Note:
//
//  1. AtomicWriter reserves the set of pathnames starting with `..`.
//  2. AtomicWriter offers no concurrency guarantees and must be synchronized
//     by the caller.
//
// The visible files in this volume are symlinks to files in the writer's data
// directory.  Actual files are stored in a hidden timestamped directory which

        }
    }

    protected short getSystemCpuPercent() {
        final long now = getCurrentTimeAsLong();
        if (now - systemCpuCheckTime > systemCpuCheckInterval) {
            synchronized (this) {
                if (now - systemCpuCheckTime > systemCpuCheckInterval) {
                    try {
                        final OsProbe osProbe = OsProbe.getInstance();

	{40, "ELOOP", "too many levels of symbolic links"},
	{42, "ENOMSG", "no message of desired type"},
	{43, "EIDRM", "identifier removed"},
	{44, "ECHRNG", "channel number out of range"},
	{45, "EL2NSYNC", "level 2 not synchronized"},
	{46, "EL3HLT", "level 3 halted"},
	{47, "EL3RST", "level 3 reset"},
	{48, "ELNRNG", "link number out of range"},
	{49, "EUNATCH", "protocol driver not attached"},
	{50, "ENOCSI", "no CSI structure available"},

//
// The zero Map is empty and ready for use. A Map must not be copied after first use.
//
// In the terminology of [the Go memory model], Map arranges that a write operation
// “synchronizes before” any read operation that observes the effect of the write, where
// read and write operations are defined as follows.
// [Map.Load], [Map.LoadAndDelete], [Map.LoadOrStore], [Map.Swap], [Map.CompareAndSwap],

	RET				//
racecallatomic_ignore:
	// Addr is outside the good range.
	// Call __tsan_go_ignore_sync_begin to ignore synchronization during the atomic op.
	// An attempt to synchronize on the address would cause crash.
	MOVD	R8, R15	// save the original function
	MOVD	R6, R17 // save the original arg list addr
	MOVD	$__tsan_go_ignore_sync_begin(SB), R8 // func addr to call
	MOVD    runtime·tls_g(SB), R10

			// It's not safe for someone to shrink this stack while we're actively
			// parking on a channel, but it is safe to grow since we do that
			// ourselves and explicitly don't want to synchronize with channels
			// since we could self-deadlock.
			throw("racy sudog adjustment due to parking on channel")
		}
		adjustsudogs(gp, &adjinfo)
	} else {
		// sudogs may be pointing in to the stack and gp has

	return f.PositionFor(p, true)
}

// -----------------------------------------------------------------------------
// FileSet

// A FileSet represents a set of source files.
// Methods of file sets are synchronized; multiple goroutines
// may invoke them concurrently.
//
// The byte offsets for each file in a file set are mapped into
// distinct (integer) intervals, one interval [base, base+size]

   * {@code ImmutableList.of(list)} returns an {@code ImmutableList<List<String>>} containing one
   * element (the given list itself).
   *
   * <p>This method is safe to use even when {@code elements} is a synchronized or concurrent
   * collection that is currently being modified by another thread.
   *
   * @throws NullPointerException if {@code elements} contains a null element
   */

	return &Summary{
		Goroutines: s.gs,
		Tasks:      s.tasks,
	}
}

// RelatedGoroutinesV2 finds a set of goroutines related to goroutine goid for v2 traces.
// The association is based on whether they have synchronized with each other in the Go
// scheduler (one has unblocked another).
func RelatedGoroutinesV2(events []Event, goid GoID) map[GoID]struct{} {
	// Process all the events, looking for transitions of goroutines

	var wg sync.WaitGroup
	ready := make(chan bool)
	wg.Add(1)
	go func() {
		data := make([]byte, 1)

		// To narrow the window we have to wait for this
		// goroutine to block in read, synchronize just before
		// calling read.
		ready <- true

		// We use syscall.Read directly to avoid the poller.
		// This will return when the write side is closed.
		n, err := syscall.Read(int(rd.Fd()), data)