tree 12ce05f277c9e0428ed13627a2de511f73912ee9
parent 20bf6a495eabad79b7b275d46fc3e11c620b8212
author Cherry Zhang <cherryyz@google.com> 1574742542 -0500
committer Cherry Zhang <cherryyz@google.com> 1574787336 +0000

runtime: disable async preemption on darwin/arm(64) if no cgo

On darwin, we use libc calls, and cgo is required on ARM and
ARM64 so we have TLS set up to save/restore G during C calls. If
cgo is absent, we cannot save/restore G in TLS, and if a signal
is received during C execution we cannot get the G. Therefore
don't send signals (and hope that we won't receive any signal
during C execution).

This can only happen in the go_bootstrap program (otherwise cgo
is required).

Fixes #35800.

Change-Id: I6c02a9378af02c19d32749a42db45165b578188d
Reviewed-on: https://go-review.googlesource.com/c/go/+/208818
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>