2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/sys/mpipe.h,v 1.4 2004/07/16 05:51:57 dillon Exp $
40 #ifndef _SYS_MALLOC_H_
41 #include <sys/malloc.h>
43 #ifndef _SYS_THREAD_H_
44 #include <sys/thread.h>
47 #include <sys/queue.h>
51 * Pipeline memory allocations with persistent store capabilities. This
52 * implements a pipeline for allocations of a particular size. It is used
53 * in order to allow memory allocations to block while at the same time
54 * guarenteeing that no deadlocks will occur.
56 * By default new allocations are zero'd out.
58 * MPF_NOZERO If specified the underlying buffers are not zero'd.
59 * Note this also means you have no way of knowing which
60 * buffers are coming from the cache and which are new
63 * MPF_CACHEDATA If specified the deconstructor will be called when
64 * the underlying buffer is free()'d, but the buffer may
65 * be reused many times before/if that happens. The
66 * buffer is NOT zero'd on reuse regardless of the
69 * If not specified and MPF_NOZERO is also not specified,
70 * then buffers reused from the cache will be zero'd as
71 * well as new allocations.
73 * Note that the deconstructor function may still be NULL
74 * if this flag is specified, meaning that you don't need
75 * notification when the cached contents is physically
78 * MPF_INT Use the interrupt reserve if necessary.
81 struct mpipe_callback;
84 malloc_type_t type; /* malloc bucket */
85 int bytes; /* allocation size */
86 int mpflags; /* MPF_ flags */
87 int mflags; /* M_ flags (used internally) */
88 int pending; /* there is a request pending */
89 int free_count; /* entries in array[] */
90 int total_count; /* total outstanding allocations incl free */
91 int ary_count; /* guarenteed allocation count */
92 int max_count; /* maximum count (M_NOWAIT used beyond nom) */
94 void **array; /* array[ary_count] */
95 void (*construct)(void *buf, void *priv);
96 void (*deconstruct)(void *buf, void *priv);
98 struct thread *thread; /* support thread for mpipe */
99 STAILQ_HEAD(, mpipe_callback) queue;
102 #define MPF_CACHEDATA 0x0001 /* cache old buffers (do not zero) */
103 #define MPF_NOZERO 0x0002 /* do not zero-out new allocations */
104 #define MPF_INT 0x0004 /* use the interrupt memory reserve */
105 #define MPF_QUEUEWAIT 0x0008
106 #define MPF_CALLBACK 0x0010 /* callback will be used */
107 #define MPF_EXITING 0x80000000
109 typedef struct malloc_pipe *malloc_pipe_t;
113 void mpipe_init(malloc_pipe_t mpipe, malloc_type_t type,
114 int bytes, int nnom, int nmax,
116 void (*construct)(void *, void *),
117 void (*deconstruct)(void *, void *),
119 void mpipe_done(malloc_pipe_t mpipe);
120 void *mpipe_alloc_waitok(malloc_pipe_t mpipe);
121 void *mpipe_alloc_nowait(malloc_pipe_t mpipe);
122 void *mpipe_alloc_callback(malloc_pipe_t mpipe,
123 void (*func)(void *arg1, void *arg2), void *arg1, void *arg2);
124 void mpipe_wait(malloc_pipe_t mpipe);
125 void mpipe_free(malloc_pipe_t mpipe, void *vbuf);