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runtime: simplify setPanicOnFault slightly 

No need to acquire the M just to change G's paniconfault flag, and the
original C implementation of SetPanicOnFault did not. The M
acquisition logic is an artifact of golang.org/cl/131010044, which was
started before golang.org/cl/123640043 (which introduced the current
"getg" function) was submitted.

Change-Id: I6d1939008660210be46904395cf5f5bbc2c8f754
Reviewed-on: https://go-review.googlesource.com/21935
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Matthew Dempsky 2016-04-12 15:51:24 -07:00
parent 381e5eee39
commit 6af4e996e2
1 changed files with 3 additions and 4 deletions
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7
src/runtime/rdebug.go
View File

@ -15,9 +15,8 @@ func setMaxStack(in int) (out int) {
//go:linkname setPanicOnFault runtime/debug.setPanicOnFault
func setPanicOnFault(new bool) (old bool) {
mp := acquirem()
old = mp.curg.paniconfault
mp.curg.paniconfault = new
releasem(mp)
_g_ := getg()
old = _g_.paniconfault
_g_.paniconfault = new
return old
}