From a515162931c35db517995e3427cb41cee2a63a0a Mon Sep 17 00:00:00 2001
From: nop <nop>
Date: Mon, 3 Mar 1997 03:44:59 +0000
Subject: Initial revision

---
 net_mplex.h | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 net_mplex.h

(limited to 'net_mplex.h')

diff --git a/net_mplex.h b/net_mplex.h
new file mode 100644
index 0000000..f0867ba
--- /dev/null
+++ b/net_mplex.h
@@ -0,0 +1,88 @@
+/******************************************************************************
+  Copyright (c) 1992, 1995, 1996 Xerox Corporation.  All rights reserved.
+  Portions of this code were written by Stephen White, aka ghond.
+  Use and copying of this software and preparation of derivative works based
+  upon this software are permitted.  Any distribution of this software or
+  derivative works must comply with all applicable United States export
+  control laws.  This software is made available AS IS, and Xerox Corporation
+  makes no warranty about the software, its performance or its conformity to
+  any specification.  Any person obtaining a copy of this software is requested
+  to send their name and post office or electronic mail address to:
+    Pavel Curtis
+    Xerox PARC
+    3333 Coyote Hill Rd.
+    Palo Alto, CA 94304
+    Pavel@Xerox.Com
+ *****************************************************************************/
+
+/* This describes the complete set of procedures that a multiplexing wait
+ * implementation must provide.
+ *
+ * The `mplex' abstraction provides a way to wait until it is possible to
+ * perform an I/O operation on any of a set of file descriptors without
+ * blocking.  Uses of the abstraction always have the following form:
+ *
+ *	mplex_clear();
+ *	{ mplex_add_reader(fd)  or  mplex_add_writer(fd) }*
+ *	timed_out = mplex_wait(timeout);
+ *	{ mplex_is_readable(fd)  or  mplex_is_writable(fd) }*
+ *
+ * The set of file descriptors maintained by the abstraction is referred to
+ * below as the `wait set'.  Each file descriptor in the wait set is marked
+ * with the kind of I/O (i.e., reading, writing, or both) desired.
+ */
+
+#ifndef Net_MPlex_H
+#define Net_MPlex_H 1
+
+extern void	mplex_clear(void);
+				/* Reset the wait set to be empty. */
+
+extern void	mplex_add_reader(int fd);
+				/* Add the given file descriptor to the wait
+				 * set, marked for reading.
+				 */
+
+extern void	mplex_add_writer(int fd);
+				/* Add the given file descriptor to the wait
+				 * set, marked for writing.
+				 */
+
+extern int	mplex_wait(unsigned timeout);
+				/* Wait until it is possible either to do the
+				 * appropriate kind of I/O on some descriptor
+				 * in the wait set or until `timeout' seconds
+				 * have elapsed.  Return true iff the timeout
+				 * expired without any I/O becoming possible.
+				 */
+
+extern int	mplex_is_readable(int fd);
+				/* Return true iff the most recent mplex_wait()
+				 * call terminated (in part) because reading
+				 * had become possible on the given descriptor.
+				 */
+
+extern int	mplex_is_writable(int fd);
+				/* Return true iff the most recent mplex_wait()
+				 * call terminated (in part) because reading
+				 * had become possible on the given descriptor.
+				 */
+
+#endif /* !Net_MPlex_H */
+
+/* $Log$
+/* Revision 1.1  1997/03/03 03:45:04  nop
+/* Initial revision
+/*
+ * Revision 2.1  1996/02/08  06:18:23  pavel
+ * Updated copyright notice for 1996.  Release 1.8.0beta1.
+ *
+ * Revision 2.0  1995/11/30  04:53:08  pavel
+ * New baseline version, corresponding to release 1.8.0alpha1.
+ *
+ * Revision 1.2  1992/10/23  23:03:47  pavel
+ * Added copyright notice.
+ *
+ * Revision 1.1  1992/09/23  17:14:17  pavel
+ * Initial RCS-controlled version.
+ */
-- 
cgit v1.2.3