The Tor Browser: memory/mozjemalloc/qr.h@8bccb770b82d

     1 /******************************************************************************

     2  *

     3  * Copyright (C) 2002 Jason Evans <jasone@canonware.com>.

     4  * All rights reserved.

     5  *

     6  * Redistribution and use in source and binary forms, with or without

     7  * modification, are permitted provided that the following conditions

     8  * are met:

     9  * 1. Redistributions of source code must retain the above copyright

    10  *    notice(s), this list of conditions and the following disclaimer

    11  *    unmodified other than the allowable addition of one or more

    12  *    copyright notices.

    13  * 2. Redistributions in binary form must reproduce the above copyright

    14  *    notice(s), this list of conditions and the following disclaimer in

    15  *    the documentation and/or other materials provided with the

    16  *    distribution.

    17  *

    18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY

    19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE

    22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR

    25  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

    26  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE

    27  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,

    28  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    29  *

    30  ******************************************************************************/

    32 /* Ring definitions. */

    33 #define qr(a_type)							\

    34 struct {								\

    35 	a_type	*qre_next;						\

    36 	a_type	*qre_prev;						\

    37 }

    39 /* Ring functions. */

    40 #define qr_new(a_qr, a_field) do {					\

    41 	(a_qr)->a_field.qre_next = (a_qr);				\

    42 	(a_qr)->a_field.qre_prev = (a_qr);				\

    43 } while (0)

    45 #define qr_next(a_qr, a_field) ((a_qr)->a_field.qre_next)

    47 #define qr_prev(a_qr, a_field) ((a_qr)->a_field.qre_prev)

    49 #define qr_before_insert(a_qrelm, a_qr, a_field) do {			\

    50 	(a_qr)->a_field.qre_prev = (a_qrelm)->a_field.qre_prev;		\

    51 	(a_qr)->a_field.qre_next = (a_qrelm);				\

    52 	(a_qr)->a_field.qre_prev->a_field.qre_next = (a_qr);		\

    53 	(a_qrelm)->a_field.qre_prev = (a_qr);				\

    54 } while (0)

    56 #define qr_after_insert(a_qrelm, a_qr, a_field)				\

    57     do									\

    58     {									\

    59 	(a_qr)->a_field.qre_next = (a_qrelm)->a_field.qre_next;		\

    60 	(a_qr)->a_field.qre_prev = (a_qrelm);				\

    61 	(a_qr)->a_field.qre_next->a_field.qre_prev = (a_qr);		\

    62 	(a_qrelm)->a_field.qre_next = (a_qr);				\

    63     } while (0)

    65 #define qr_meld(a_qr_a, a_qr_b, a_field) do {				\

    66 	void *t;							\

    67 	(a_qr_a)->a_field.qre_prev->a_field.qre_next = (a_qr_b);	\

    68 	(a_qr_b)->a_field.qre_prev->a_field.qre_next = (a_qr_a);	\

    69 	t = (a_qr_a)->a_field.qre_prev;					\

    70 	(a_qr_a)->a_field.qre_prev = (a_qr_b)->a_field.qre_prev;	\

    71 	(a_qr_b)->a_field.qre_prev = t;					\

    72 } while (0)

    74 /* qr_meld() and qr_split() are functionally equivalent, so there's no need to

    75  * have two copies of the code. */

    76 #define qr_split(a_qr_a, a_qr_b, a_field)				\

    77 	qr_meld((a_qr_a), (a_qr_b), a_field)

    79 #define qr_remove(a_qr, a_field) do {					\

    80 	(a_qr)->a_field.qre_prev->a_field.qre_next			\

    81 	    = (a_qr)->a_field.qre_next;					\

    82 	(a_qr)->a_field.qre_next->a_field.qre_prev			\

    83 	    = (a_qr)->a_field.qre_prev;					\

    84 	(a_qr)->a_field.qre_next = (a_qr);				\

    85 	(a_qr)->a_field.qre_prev = (a_qr);				\

    86 } while (0)

    88 #define qr_foreach(var, a_qr, a_field)					\

    89 	for ((var) = (a_qr);						\

    90 	    (var) != NULL;						\

    91 	    (var) = (((var)->a_field.qre_next != (a_qr))		\

    92 	    ? (var)->a_field.qre_next : NULL))

    94 #define qr_reverse_foreach(var, a_qr, a_field)				\

    95 	for ((var) = ((a_qr) != NULL) ? qr_prev(a_qr, a_field) : NULL;	\

    96 	    (var) != NULL;						\

    97 	    (var) = (((var) != (a_qr))					\

    98 	    ? (var)->a_field.qre_prev : NULL))

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