/usr/share/go-1.8/src/runtime/cgo.go is in golang-1.8-src 1.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | // Copyright 2014 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.
package runtime
import "unsafe"
//go:cgo_export_static main
// Filled in by runtime/cgo when linked into binary.
//go:linkname _cgo_init _cgo_init
//go:linkname _cgo_thread_start _cgo_thread_start
//go:linkname _cgo_sys_thread_create _cgo_sys_thread_create
//go:linkname _cgo_notify_runtime_init_done _cgo_notify_runtime_init_done
//go:linkname _cgo_callers _cgo_callers
//go:linkname _cgo_set_context_function _cgo_set_context_function
var (
_cgo_init unsafe.Pointer
_cgo_thread_start unsafe.Pointer
_cgo_sys_thread_create unsafe.Pointer
_cgo_notify_runtime_init_done unsafe.Pointer
_cgo_callers unsafe.Pointer
_cgo_set_context_function unsafe.Pointer
)
// iscgo is set to true by the runtime/cgo package
var iscgo bool
// 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:
// 1) they are opaque to escape analysis, so the argument is considered to
// escape to the heap.
// 2) they keep the argument alive until the call site; the call is emitted after
// the end of the (presumed) use of the argument by C.
// cgoUse should not actually be called (see cgoAlwaysFalse).
func cgoUse(interface{}) { throw("cgoUse should not be called") }
// cgoAlwaysFalse is a boolean value that is always false.
// The cgo-generated code says if cgoAlwaysFalse { cgoUse(p) }.
// The compiler cannot see that cgoAlwaysFalse is always false,
// so it emits the test and keeps the call, giving the desired
// escape analysis result. The test is cheaper than the call.
var cgoAlwaysFalse bool
|