Added new files to support the new fast pipes. After the follow-on

commits, pipe performance should increase significantly.  The pipe(2)
system call is currently supported, while fifofs will be added later.

1 files changed, 73 insertions, 0 deletions

diff --git a/sys/sys/pipe.h b/sys/sys/pipe.h
new file mode 100644
index 0000000..2815805
--- /dev/null
+++ b/sys/sys/pipe.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 1996 John S. Dyson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice immediately at the beginning of the file, without modification,
+ *    this list of conditions, and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Absolutely no warranty of function or purpose is made by the author
+ *    John S. Dyson.
+ * 4. This work was done expressly for inclusion into FreeBSD.  Other use
+ *    is allowed if this notation is included.
+ * 5. Modifications may be freely made to this file if the above conditions
+ *    are met.
+ *
+ * $Id$
+ */
+
+#ifndef OLD_PIPE
+
+struct vm_object;
+
+/*
+ * pipe buffer information
+ * Seperate in, out, cnt is used to simplify calculations.
+ */
+struct pipebuf {
+	u_int	cnt;		/* number of chars currently in buffer */
+	u_int	in;		/* in pointer */
+	u_int	out;		/* out pointer */
+	u_int	size;		/* size of buffer */
+	caddr_t	buffer;		/* kva of buffer */
+	struct	vm_object *object; /* VM object containing buffer */
+};
+
+/*
+ * pipe_state bits
+ */
+#define PIPE_NBIO 0x1		/* non-blocking I/O */
+#define PIPE_ASYNC 0x4		/* Async? I/O */
+#define PIPE_WANTR 0x8		/* Reader wants some characters */
+#define PIPE_WANTW 0x10		/* Writer wants space to put characters */
+#define PIPE_WANT 0x20		/* Pipe is wanted to be run-down */
+#define PIPE_SEL 0x40		/* Pipe has a select active */
+#define PIPE_EOF 0x80		/* Pipe is in EOF condition */
+#define PIPE_LOCK 0x100		/* Process has exclusive access to pointers/data */
+#define PIPE_LWANT 0x200	/* Process wants exclusive access to pointers/data */
+
+/*
+ * Per-pipe data structure
+ * Two of these are linked together to produce bi-directional
+ * pipes.
+ */
+struct pipe {
+	struct	pipebuf pipe_buffer;	/* data storage */
+	struct	selinfo pipe_sel;	/* for compat with select */
+	struct	timeval pipe_atime;	/* time of last access */
+	struct	timeval pipe_mtime;	/* time of last modify */
+	struct	timeval pipe_ctime;	/* time of status change */
+	int	pipe_pgid;
+	struct	pipe	*pipe_peer;	/* link with other direction */
+	u_int	pipe_state;		/* pipe status info */
+	int	pipe_busy;		/* busy flag, mostly to handle rundown sanely */
+};
+
+int pipe_stat __P((struct pipe *pipe, struct stat *ub));
+
+#endif