1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2019 The FreeBSD Foundation
5 * All rights reserved.
6 *
7 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
8 * under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/types.h>
33 #include <sys/mman.h>
34 #include <rtld_malloc.h>
35 #include "thr_private.h"
36
37 int npagesizes;
38 size_t *pagesizes;
39 static size_t pagesizes_d[2];
40 static struct umutex thr_malloc_umtx;
41 static u_int thr_malloc_umtx_level;
42
43 void
__thr_malloc_init(void)44 __thr_malloc_init(void)
45 {
46
47 if (npagesizes != 0)
48 return;
49 npagesizes = getpagesizes(pagesizes_d, nitems(pagesizes_d));
50 if (npagesizes == -1) {
51 PANIC("Unable to read page sizes");
52 }
53 pagesizes = pagesizes_d;
54 _thr_umutex_init(&thr_malloc_umtx);
55 }
56
57 static void
thr_malloc_lock(struct pthread * curthread)58 thr_malloc_lock(struct pthread *curthread)
59 {
60 uint32_t curtid;
61
62 if (curthread == NULL)
63 return;
64 curthread->locklevel++;
65 curtid = TID(curthread);
66 if ((uint32_t)thr_malloc_umtx.m_owner == curtid)
67 thr_malloc_umtx_level++;
68 else
69 _thr_umutex_lock(&thr_malloc_umtx, curtid);
70 }
71
72 static void
thr_malloc_unlock(struct pthread * curthread)73 thr_malloc_unlock(struct pthread *curthread)
74 {
75
76 if (curthread == NULL)
77 return;
78 if (thr_malloc_umtx_level > 0)
79 thr_malloc_umtx_level--;
80 else
81 _thr_umutex_unlock(&thr_malloc_umtx, TID(curthread));
82 curthread->locklevel--;
83 _thr_ast(curthread);
84 }
85
86 void *
__thr_calloc(size_t num,size_t size)87 __thr_calloc(size_t num, size_t size)
88 {
89 struct pthread *curthread;
90 void *res;
91
92 curthread = _get_curthread();
93 thr_malloc_lock(curthread);
94 res = __crt_calloc(num, size);
95 thr_malloc_unlock(curthread);
96 return (res);
97 }
98
99 void
__thr_free(void * cp)100 __thr_free(void *cp)
101 {
102 struct pthread *curthread;
103
104 curthread = _get_curthread();
105 thr_malloc_lock(curthread);
106 __crt_free(cp);
107 thr_malloc_unlock(curthread);
108 }
109
110 void *
__thr_malloc(size_t nbytes)111 __thr_malloc(size_t nbytes)
112 {
113 struct pthread *curthread;
114 void *res;
115
116 curthread = _get_curthread();
117 thr_malloc_lock(curthread);
118 res = __crt_malloc(nbytes);
119 thr_malloc_unlock(curthread);
120 return (res);
121 }
122
123 void *
__thr_realloc(void * cp,size_t nbytes)124 __thr_realloc(void *cp, size_t nbytes)
125 {
126 struct pthread *curthread;
127 void *res;
128
129 curthread = _get_curthread();
130 thr_malloc_lock(curthread);
131 res = __crt_realloc(cp, nbytes);
132 thr_malloc_unlock(curthread);
133 return (res);
134 }
135
136 void
__thr_malloc_prefork(struct pthread * curthread)137 __thr_malloc_prefork(struct pthread *curthread)
138 {
139
140 _thr_umutex_lock(&thr_malloc_umtx, TID(curthread));
141 }
142
143 void
__thr_malloc_postfork(struct pthread * curthread)144 __thr_malloc_postfork(struct pthread *curthread)
145 {
146
147 _thr_umutex_unlock(&thr_malloc_umtx, TID(curthread));
148 }
149