tcp(4): use per-sockbuf mutex to protect `so_snd' socket buffer
tcp(4): use per-sockbuf mutex to protect `so_snd' socket buffer
tcp(4): use per-sockbuf mutex to protect `so_snd' socket buffer
tcp(4): use per-sockbuf mutex to protect `so_snd' socket buffer
tcp(4): use per-sockbuf mutex to protect `so_snd' socket buffer
tcp(4): use per-sockbuf mutex to protect `so_snd' socket buffer