src/runtime/cgo/libcgo_windows.h - go - Git at Google

 // Copyright 2020 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

 // Call _beginthread, aborting on failure.
 void _cgo_beginthread(unsigned long (__stdcall *func)(void*), void* arg);
	// Copyright 2020 The Go Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	// Call _beginthread, aborting on failure.
	void _cgo_beginthread(unsigned long (__stdcall func)(void), void* arg);