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

//go:build !windows

package runtime

//go:nosplit
func osPreemptExtEnter(mp *m) {}

//go:nosplit

	stdcall1(_ResumeThread, thread)
	stdcall1(_CloseHandle, thread)
}

// osPreemptExtEnter is called before entering external code that may
// call ExitProcess.
//
// This must be nosplit because it may be called from a syscall with
// untyped stack slots, so the stack must not be grown or scanned.
//
//go:nosplit
func osPreemptExtEnter(mp *m) {
	for !atomic.Cas(&mp.preemptExtLock, 0, 1) {

	// code. We do this after entersyscall because this may block
	// and cause an async preemption to fail, but at this point a
	// sync preemption will succeed (though this is not a matter
	// of correctness).
	osPreemptExtEnter(mp)

	mp.incgo = true
	// We use ncgo as a check during execution tracing for whether there is
	// any C on the call stack, which there will be after this point. If

	// which can theoretically call back into Go.
	// Tell the scheduler we entering external code.
	entersyscall()

	// We're entering external code that may call ExitProcess on
	// Windows.
	osPreemptExtEnter(getg().m)

	racecall(&__tsan_fini, 0, 0, 0, 0)
}

//go:nosplit
func raceproccreate() uintptr {
	var ctx uintptr
	racecall(&__tsan_proc_create, uintptr(unsafe.Pointer(&ctx)), 0, 0, 0)
	return ctx