From 73df946d56c74384511a194dd01dbe099584fd1a Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 15:14:23 +0200 Subject: Adding upstream version 1.16.10. Signed-off-by: Daniel Baumann --- src/runtime/debuglog_on.go | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 src/runtime/debuglog_on.go (limited to 'src/runtime/debuglog_on.go') diff --git a/src/runtime/debuglog_on.go b/src/runtime/debuglog_on.go new file mode 100644 index 0000000..3d477e8 --- /dev/null +++ b/src/runtime/debuglog_on.go @@ -0,0 +1,45 @@ +// Copyright 2019 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build debuglog + +package runtime + +const dlogEnabled = true + +// dlogPerM is the per-M debug log data. This is embedded in the m +// struct. +type dlogPerM struct { + dlogCache *dlogger +} + +// getCachedDlogger returns a cached dlogger if it can do so +// efficiently, or nil otherwise. The returned dlogger will be owned. +func getCachedDlogger() *dlogger { + mp := acquirem() + // We don't return a cached dlogger if we're running on the + // signal stack in case the signal arrived while in + // get/putCachedDlogger. (Too bad we don't have non-atomic + // exchange!) + var l *dlogger + if getg() != mp.gsignal { + l = mp.dlogCache + mp.dlogCache = nil + } + releasem(mp) + return l +} + +// putCachedDlogger attempts to return l to the local cache. It +// returns false if this fails. +func putCachedDlogger(l *dlogger) bool { + mp := acquirem() + if getg() != mp.gsignal && mp.dlogCache == nil { + mp.dlogCache = l + releasem(mp) + return true + } + releasem(mp) + return false +} -- cgit v1.2.3