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os: use the syscall version of Getwd for Plan 9

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In Plan 9, each OS thread has its own independent working directory,
so the Go runtime for Plan 9 needs to coordinate Chdir and Getwd
operations to keep the working directory consistent for all goroutines.

The function os.Getwd in Plan 9 should always call syscall.Getwd
to retrieve the common working directory.  Failure to do this was
the cause of (at least some of) the intermittent failures in the
Plan 9 builders with a seemingly spurious "file does not exist"
message, when a thread's working directory had been removed in
another thread.

Change-Id: Ifb834ad025ee39578234ad3b04d08bc98e939291
Reviewed-on: https://go-review.googlesource.com/89575
Reviewed-by: David du Colombier <0intro@gmail.com>
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Richard Miller 2018-01-24 16:17:05 +00:00 committed by David du Colombier
parent 8d88c9ae07
commit e72e69a3f6
1 changed files with 1 additions and 1 deletions
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2
src/os/getwd.go
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@ -24,7 +24,7 @@ var useSyscallwd = func(error) bool { return true }
// reached via multiple paths (due to symbolic links),
// Getwd may return any one of them.
func Getwd() (dir string, err error) {
if runtime.GOOS == "windows" {
if runtime.GOOS == "windows" || runtime.GOOS == "plan9" {
return syscall.Getwd()
}