//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname set_crosscall2
var set_crosscall2 func()

// cgoHasExtraM is set on startup when an extra M is created for cgo.
// The extra M must be created before any C/C++ code calls cgocallback.
var cgoHasExtraM bool

// cgoUse is called by cgo-generated code (using go:linkname to get at
// an unexported name). The calls serve two purposes:

}

// This runs on a foreign stack, without an m or a g. No stack split.
//
//go:nosplit
//go:norace
//go:nowritebarrierrec
func badsignal(sig uintptr, c *sigctxt) {
	if !iscgo && !cgoHasExtraM {
		// There is no extra M. needm will not be able to grab
		// an M. Instead of hanging, just crash.
		// Cannot call split-stack function as there is no G.
		writeErrStr("fatal: bad g in signal handler\n")

	// An extra M is also needed on Windows for callbacks created by
	// syscall.NewCallback. See issue #6751 for details.
	if (iscgo || GOOS == "windows") && !cgoHasExtraM {
		cgoHasExtraM = true
		newextram()
	}
	initsig(false)
}

// mPark causes a thread to park itself, returning once woken.
//
//go:nosplit
func mPark() {
	gp := getg()