add directory study

study/linux-travel/MINIX-1.5/1.5/Source/amoeba/kernel/mpx.H

@@ -0,0 +1,43 @@
+/****************************************************************************/
+/*									    */
+/* (c) Copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands */
+/*									    */
+/*    This product is part of the  Amoeba  distributed operating system.    */
+/*									    */
+/*    Permission to use, sell, duplicate or disclose this software must be  */
+/* obtained in writing.  Requests for such permissions may be sent to	    */
+/*									    */
+/*									    */
+/*		Dr. Andrew S. Tanenbaum					    */
+/*		Dept. of Mathematics and Computer Science		    */
+/*		Vrije Universiteit					    */
+/*		Postbus 7161						    */
+/*		1007 MC Amsterdam					    */
+/*		The Netherlands						    */
+/*									    */
+/****************************************************************************/
+
+struct mpx {
+	short	MX_active;		/* is a transaction in progress */
+	unshort	MX_flags;		/* flags - see below */
+	int	MX_proc_nr;		/* task identifier */
+	header	MX_hdr;			/* storage space for header */
+} tk_mpx;
+
+#ifdef MPX
+
+#define mx_flags	tk_mpx.MX_flags
+#define mx_active	tk_mpx.MX_active
+#define mx_proc_nr	tk_mpx.MX_proc_nr
+#define	mx_hdr		tk_mpx.MX_hdr
+
+
+/* bits in flags: */
+#define RUNNABLE	bit(0)		/* task is runnable */
+#define NESTED		bit(1)		/* nested getreq, trans or putrep */
+#define	BETWEEN		bit(2)		/* between getreq and putrep */
+#else
+
+#define tk_mpx		tk_dummy	/* other modules must not touch it */
+
+#endif