// most-recent labels write separately.)
	//
	// racereleasemerge is like a full read-modify-write on
	// labelSync, rather than just a store-release, so it carries
	// a dependency on the previous racereleasemerge, which
	// ultimately carries forward to the acquire in profBuf.read.
	if raceenabled {
		racereleasemerge(unsafe.Pointer(&labelSync))
	}
	getg().labels = labels
}

	racerelease(addr)
}

// RaceReleaseMerge is like RaceRelease, but also establishes a happens-before
// relation with the preceding RaceRelease or RaceReleaseMerge on addr.
//
// In terms of the C memory model, RaceReleaseMerge is equivalent to
// atomic_exchange(memory_order_release).
//
//go:nosplit
func RaceReleaseMerge(addr unsafe.Pointer) {
	racereleasemerge(addr)
}

	inc := g.inc.Load()
	if inc == nil {
		newInc := godebugNewIncNonDefault.Load()
		if newInc == nil {
			return
		}
		inc = new(func())
		*inc = (*newInc)(g.name)
		if raceenabled {
			racereleasemerge(unsafe.Pointer(&g.inc))
		}
		if !g.inc.CompareAndSwap(nil, inc) {
			inc = g.inc.Load()
		}
	}
	if raceenabled {
		raceacquire(unsafe.Pointer(&g.inc))
	}
	(*inc)()
}

	if !iscgo && GOOS != "solaris" && GOOS != "illumos" && GOOS != "windows" {
		throw("cgocall unavailable")
	}

	if fn == nil {
		throw("cgocall nil")
	}

	if raceenabled {
		racereleasemerge(unsafe.Pointer(&racecgosync))
	}

	mp := getg().m
	mp.ncgocall++

	// Reset traceback.
	mp.cgoCallers[0] = 0

	// Announce we are entering a system call

	if raceenabled {
		raceReleaseMerge(unsafe.Pointer(&ioSync))
	}
	n, err = writev(fd, iovecs)
	writevRacedetect(iovecs, n)
	return n, err
}

func Pwritev(fd int, iovs [][]byte, offset int64) (n int, err error) {
	iovecs := make([]Iovec, 0, minIovec)
	iovecs = appendBytes(iovecs, iovs)
	if raceenabled {
		raceReleaseMerge(unsafe.Pointer(&ioSync))
	}

	return Mknodat(AT_FDCWD, path, mode, dev)
}

func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	if raceenabled {
		raceReleaseMerge(unsafe.Pointer(&ioSync))
	}
	return sendfile(outfd, infd, offset, count)
}

//sys	ptrace(request int, pid int, addr uintptr, data int) (err error)

		}
		di += int(data[di])
		ti++
	}

	// Remember how much we returned, to commit read on next call.
	b.rNext = br.addCountsAndClearFlags(skip+di, ti)

	if raceenabled {
		// Match racereleasemerge in runtime_setProfLabel,
		// so that the setting of the labels in runtime_setProfLabel
		// is treated as happening before any use of the labels
		// by our caller. The synchronization on labelSync itself is a fiction

			return 0, nil
		}
		return 0, e
	}
	return int(done), nil
}

func Write(fd Handle, p []byte) (n int, err error) {
	if raceenabled {
		raceReleaseMerge(unsafe.Pointer(&ioSync))
	}
	var done uint32
	e := WriteFile(fd, p, &done, nil)
	if e != nil {
		return 0, e
	}
	return int(done), nil
}

		}
		if err == nil {
			raceAcquire(unsafe.Pointer(&ioSync))
		}
	}
	return
}

func Write(fd int, p []byte) (n int, err error) {
	if raceenabled {
		raceReleaseMerge(unsafe.Pointer(&ioSync))
	}
	n, err = write(fd, p)
	if raceenabled && n > 0 {
		raceReadRange(unsafe.Pointer(&p[0]), n)
	}
	return
}

// For testing: clients can set this flag to force