diff options
| author | Brad Fitzpatrick <bradfitz@golang.org> | 2018-08-02 19:15:25 +0000 |
|---|---|---|
| committer | Brad Fitzpatrick <bradfitz@golang.org> | 2018-08-21 04:39:22 +0000 |
| commit | 80fe2e6e37120e665cd523e1edf7eb1401b9b73b (patch) | |
| tree | ee9ccbe132a967e3c349513e02e57ae6d17a132b /src | |
| parent | 827248484004300c52162d55dfa05083862062ed (diff) | |
| download | go-80fe2e6e37120e665cd523e1edf7eb1401b9b73b.tar.xz | |
net: lazily look up the listenerBacklog value on first use
Don't open files or do sysctls in init.
Updates #26775
Change-Id: I017bed6c24ef1e4bc30040120349fb779f203225
Reviewed-on: https://go-review.googlesource.com/127655
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/net/net.go | 11 | ||||
| -rw-r--r-- | src/net/sock_posix.go | 2 |
2 files changed, 11 insertions, 2 deletions
diff --git a/src/net/net.go b/src/net/net.go index c909986269..77b8f69074 100644 --- a/src/net/net.go +++ b/src/net/net.go @@ -357,7 +357,16 @@ type PacketConn interface { SetWriteDeadline(t time.Time) error } -var listenerBacklog = maxListenerBacklog() +var listenerBacklogCache struct { + sync.Once + val int +} + +// listenerBacklog is a caching wrapper around maxListenerBacklog. +func listenerBacklog() int { + listenerBacklogCache.Do(func() { listenerBacklogCache.val = maxListenerBacklog() }) + return listenerBacklogCache.val +} // A Listener is a generic network listener for stream-oriented protocols. // diff --git a/src/net/sock_posix.go b/src/net/sock_posix.go index 677e423ffa..1cfd8a58c6 100644 --- a/src/net/sock_posix.go +++ b/src/net/sock_posix.go @@ -54,7 +54,7 @@ func socket(ctx context.Context, net string, family, sotype, proto int, ipv6only if laddr != nil && raddr == nil { switch sotype { case syscall.SOCK_STREAM, syscall.SOCK_SEQPACKET: - if err := fd.listenStream(laddr, listenerBacklog, ctrlFn); err != nil { + if err := fd.listenStream(laddr, listenerBacklog(), ctrlFn); err != nil { fd.Close() return nil, err } |