func racewriterangepc(addr unsafe.Pointer, sz, callerpc, pc uintptr)        { throw("race") }
func raceacquire(addr unsafe.Pointer)                                       { throw("race") }
func raceacquireg(gp *g, addr unsafe.Pointer)                               { throw("race") }
func raceacquirectx(racectx uintptr, addr unsafe.Pointer)                   { throw("race") }

	// operations like close().
	return unsafe.Pointer(&c.buf)
}

func racesync(c *hchan, sg *sudog) {
	racerelease(chanbuf(c, 0))
	raceacquireg(sg.g, chanbuf(c, 0))
	racereleaseg(sg.g, chanbuf(c, 0))
	raceacquire(chanbuf(c, 0))
}

// Notify the race detector of a send or receive involving buffer entry idx
// and a channel c or its communicating partner sg.

// In terms of the C memory model (C11 §5.1.2.4, §7.17.3),
// RaceAcquire is equivalent to atomic_load(memory_order_acquire).
//
//go:nosplit
func RaceAcquire(addr unsafe.Pointer) {
	raceacquire(addr)
}

// RaceRelease performs a release operation on addr that
// can synchronize with a later RaceAcquire on addr.
//
// In terms of the C memory model, RaceRelease is equivalent to

			tl := traceAcquire()
			if !pp.trace.statusWasTraced(tl.gen) {
				tl.writer().writeProcStatusForP(pp, false).end()
			}
			traceRelease(tl)
		})
		semrelease(&worldsema)
	}

	// Block until the trace reader has finished processing the last generation.
	semacquire(&trace.doneSema[gen%2])
	if raceenabled {
		raceacquire(unsafe.Pointer(&trace.doneSema[gen%2]))
	}

// license that can be found in the LICENSE file.

//go:build plan9 && race

package plan9

import (
	"runtime"
	"unsafe"
)

const raceenabled = true

func raceAcquire(addr unsafe.Pointer) {
	runtime.RaceAcquire(addr)
}

func raceReleaseMerge(addr unsafe.Pointer) {
	runtime.RaceReleaseMerge(addr)
}

func raceReadRange(addr unsafe.Pointer, len int) {
	runtime.RaceReadRange(addr, len)
}

// license that can be found in the LICENSE file.

//go:build windows && race

package windows

import (
	"runtime"
	"unsafe"
)

const raceenabled = true

func raceAcquire(addr unsafe.Pointer) {
	runtime.RaceAcquire(addr)
}

func raceReleaseMerge(addr unsafe.Pointer) {
	runtime.RaceReleaseMerge(addr)
}

func raceReadRange(addr unsafe.Pointer, len int) {
	runtime.RaceReadRange(addr, len)
}

//go:build (darwin && race) || (linux && race) || (freebsd && race)

package unix

import (
	"runtime"
	"unsafe"
)

const raceenabled = true

func raceAcquire(addr unsafe.Pointer) {
	runtime.RaceAcquire(addr)
}

func raceReleaseMerge(addr unsafe.Pointer) {
	runtime.RaceReleaseMerge(addr)
}

func raceReadRange(addr unsafe.Pointer, len int) {
	runtime.RaceReadRange(addr, len)
}

// license that can be found in the LICENSE file.

//go:build windows && !race

package windows

import (
	"unsafe"
)

const raceenabled = false

func raceAcquire(addr unsafe.Pointer) {
}

func raceReleaseMerge(addr unsafe.Pointer) {
}

func raceReadRange(addr unsafe.Pointer, len int) {
}

func raceWriteRange(addr unsafe.Pointer, len int) {

// not inlineable, and we want traceAcquire to be inlineable for
// low overhead when the trace is disabled.
const debugTraceReentrancy = false

// traceAcquire prepares this M for writing one or more trace events.
//
// nosplit because it's called on the syscall path when stack movement is forbidden.
//
//go:nosplit
func traceAcquire() traceLocker {
	if !traceEnabled() {
		return traceLocker{}

// license that can be found in the LICENSE file.

//go:build race

package race

import (
	"runtime"
	"unsafe"
)

const Enabled = true

func Acquire(addr unsafe.Pointer) {
	runtime.RaceAcquire(addr)
}

func Release(addr unsafe.Pointer) {
	runtime.RaceRelease(addr)
}

func ReleaseMerge(addr unsafe.Pointer) {
	runtime.RaceReleaseMerge(addr)
}

func Disable() {
	runtime.RaceDisable()