qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-24 07:50:13 -07:00
Code Releases Activity

runtime: Plan 9 - prevent preemption by GC while exiting

Browse Source 
On Plan 9, there's no "kill all threads" system call, so exit is done
by sending a "go: exit" note to each OS process.  If concurrent GC
occurs during this loop, deadlock sometimes results.  Prevent this by
incrementing m.locks before sending notes.

Change-Id: I31aa15134ff6e42d9a82f9f8a308620b3ad1b1b1
Reviewed-on: https://go-review.googlesource.com/20477
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Richard Miller 2016-03-09 16:16:05 +00:00 committed by Brad Fitzpatrick
parent 87103a1ab7
commit 6b59d61822
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/runtime/os1_plan9.go
View File

@ -151,6 +151,7 @@ var goexits = []byte("go: exit ")
func goexitsall(status *byte) {
var buf [_ERRMAX]byte
getg().m.locks++
n := copy(buf[:], goexits)
n = copy(buf[n:], gostringnocopy(status))
pid := getpid()
@ -159,6 +160,7 @@ func goexitsall(status *byte) {
postnote(mp.procid, buf[:])
}
}
getg().m.locks--
}
var procdir = []byte("/proc/")