blob: b8150202251b36eeda9d16244e26da2aee0bab08 [file] [log] [blame]
// 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.
//go: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
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
return true
return false