108 struct pipe {  struct
109 	struct	pipebuf pipe_buffer;	/* data storage */  argument
110 	struct	pipemapping pipe_pages;	/* wired pages for direct I/O */  argument
111 	struct	selinfo pipe_sel;	/* for compat with select */  argument
112 	struct	timespec pipe_atime;	/* time of last access */  argument
113 	struct	timespec pipe_mtime;	/* time of last modify */  argument
114 	struct	timespec pipe_ctime;	/* time of status change */  argument
115 	struct	sigio *pipe_sigio;	/* information for async I/O */  argument
116 	struct	pipe *pipe_peer;	/* link with other direction */  argument
117 	struct	pipepair *pipe_pair;	/* container structure pointer */  argument
118 	u_short	pipe_state;		/* pipe status info */  argument
119 	u_char	pipe_type;		/* pipe type info */  argument
120 	u_char	pipe_present;		/* still present? */  argument
121 	int	pipe_waiters;		/* pipelock waiters */  argument
122 	int	pipe_busy;		/* busy flag, mostly to handle rundown sanely */  argument
123 	int	pipe_wgen;		/* writer generation for named pipe */  argument
124 	ino_t	pipe_ino;		/* fake inode for stat(2) */  argument
145 #define PIPE_MTX(pipe)		(&(pipe)->pipe_pair->pp_mtx)  argument
146 #define PIPE_LOCK(pipe)		mtx_lock(PIPE_MTX(pipe))  argument
147 #define PIPE_UNLOCK(pipe)	mtx_unlock(PIPE_MTX(pipe))  argument
148 #define PIPE_LOCK_ASSERT(pipe, type)  mtx_assert(PIPE_MTX(pipe), (type))  argument