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-rw-r--r--libgo/go/sync/mutex.go6
1 files changed, 4 insertions, 2 deletions
diff --git a/libgo/go/sync/mutex.go b/libgo/go/sync/mutex.go
index eb52614..9089279 100644
--- a/libgo/go/sync/mutex.go
+++ b/libgo/go/sync/mutex.go
@@ -3,8 +3,8 @@
// license that can be found in the LICENSE file.
// Package sync provides basic synchronization primitives such as mutual
-// exclusion locks. Other than the Once and WaitGroup types, most are intended
-// for use by low-level library routines. Higher-level synchronization is
+// exclusion locks. Other than the Once and WaitGroup types, most are intended
+// for use by low-level library routines. Higher-level synchronization is
// better done via channels and communication.
//
// Values containing the types defined in this package should not be copied.
@@ -19,6 +19,8 @@ import (
// A Mutex is a mutual exclusion lock.
// Mutexes can be created as part of other structures;
// the zero value for a Mutex is an unlocked mutex.
+//
+// A Mutex must not be copied after first use.
type Mutex struct {
state int32
sema uint32