Update gated_writer.go

This commit is contained in:
Xingyu Chen 2016-08-14 16:36:21 +08:00 committed by GitHub
parent 53009f2466
commit 07d141570c
1 changed files with 22 additions and 9 deletions

View File

@ -29,15 +29,28 @@ func (w *GatedWriter) Flush() {
}
func (w *GatedWriter) Write(p []byte) (n int, err error) {
w.lock.Lock()
defer w.lock.Unlock()
// Once we flush we no longer synchronize writers since there's
// no use of the internal buffer. This is the happy path.
w.lock.RLock()
if w.flush {
w.lock.RUnlock()
return w.Writer.Write(p)
}
w.lock.RUnlock()
if w.flush {
return w.Writer.Write(p)
}
// Now take the write lock.
w.lock.Lock()
defer w.lock.Unlock()
p2 := make([]byte, len(p))
copy(p2, p)
w.buf = append(w.buf, p2)
return len(p), nil
// Things could have changed between the locking operations, so we
// have to check one more time.
if w.flush {
return w.Writer.Write(p)
}
// Buffer up the written data.
p2 := make([]byte, len(p))
copy(p2, p)
w.buf = append(w.buf, p2)
return len(p), nil
}