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[/] [or1k/] [trunk/] [gdb-5.3/] [gdb/] [osf-share/] [cma_list.h] - Blame information for rev 1765

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1 1181 sfurman
/*
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 * (c) Copyright 1990-1996 OPEN SOFTWARE FOUNDATION, INC.
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 * (c) Copyright 1990-1996 HEWLETT-PACKARD COMPANY
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 * (c) Copyright 1990-1996 DIGITAL EQUIPMENT CORPORATION
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 * (c) Copyright 1991, 1992 Siemens-Nixdorf Information Systems
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 * To anyone who acknowledges that this file is provided "AS IS" without
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 * any express or implied warranty: permission to use, copy, modify, and
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 * distribute this file for any purpose is hereby granted without fee,
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 * provided that the above copyright notices and this notice appears in
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 * all source code copies, and that none of the names listed above be used
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 * in advertising or publicity pertaining to distribution of the software
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 * without specific, written prior permission.  None of these organizations
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 * makes any representations about the suitability of this software for
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 * any purpose.
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 */
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/*
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 *      Header file for generic list functions operating on singly linked
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 *      null-terminated lists.  Items may not be REMOVED from the list!  The
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 *      intent is that the list can be traversed (for read-only operations)
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 *      without locking, since insertion is "safe" (though not truely
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 *      atomic).  THIS ASSUMES THAT THE HARDWARE MAKES WRITES VISIBLE TO READS
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 *      IN THE ORDER IN WHICH THEY OCCURRED!  WITHOUT SUCH READ/WRITE
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 *      ORDERING, IT MAY BE NECESSARY TO INSERT "BARRIERS" TO PRODUCE THE
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 *      REQUIRED VISIBILITY!
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 */
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#ifndef CMA_LIST
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#define CMA_LIST
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/*
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 *  INCLUDE FILES
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 */
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#include <cma.h>
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/*
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 * CONSTANTS AND MACROS
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 */
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#define cma__c_null_list        ((cma__t_list *)cma_c_null_ptr)
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/*
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 * Test whether a list is empty.  Return cma_c_true if so, else
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 * cma_c_false.
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 */
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#define cma__list_empty(head)   ((head)->link == cma__c_null_list)
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/*
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 * Initialize a queue header to empty.
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 */
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#define cma__list_init(head)    (void)((head)->link = cma__c_null_list)
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/*
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 * Insert an element in a list following the specified item (or at the
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 * beginning of the list if "list" is the list head).  NOTE: insertion
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 * operations should be interlocked by the caller!
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 */
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#define cma__list_insert(element,list)    (void)(       \
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    (element)->link             = (list)->link,         \
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    (list)->link                = (element))
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/*
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 * Return the next item in a list (or the first, if the address is of the
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 * list header)
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 */
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#define cma__list_next(element)    ((element)->link)
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/*
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 * TYPEDEFS
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 */
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typedef struct CMA__T_LIST {
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    struct CMA__T_LIST  *link;          /* Forward link */
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    } cma__t_list;
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/*
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 *  GLOBAL DATA
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 */
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/*
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 * INTERNAL INTERFACES
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 */
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#endif

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