1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2019 The FreeBSD Foundation
5 * All rights reserved.
6 *
7 * This software was developed by Konstantin Belousov <[email protected]>
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/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #include <sys/types.h>
36 #include <sys/mman.h>
37 #include <rtld_malloc.h>
38 #include "thr_private.h"
39
40 int npagesizes;
41 size_t *pagesizes;
42 static size_t pagesizes_d[2];
43 static struct umutex thr_malloc_umtx;
44 static u_int thr_malloc_umtx_level;
45
46 void
__thr_malloc_init(void)47 __thr_malloc_init(void)
48 {
49
50 if (npagesizes != 0)
51 return;
52 npagesizes = getpagesizes(pagesizes_d, nitems(pagesizes_d));
53 if (npagesizes == -1) {
54 npagesizes = 1;
55 pagesizes_d[0] = PAGE_SIZE;
56 }
57 pagesizes = pagesizes_d;
58 _thr_umutex_init(&thr_malloc_umtx);
59 }
60
61 static void
thr_malloc_lock(struct pthread * curthread)62 thr_malloc_lock(struct pthread *curthread)
63 {
64 uint32_t curtid;
65
66 if (curthread == NULL)
67 return;
68 curthread->locklevel++;
69 curtid = TID(curthread);
70 if ((uint32_t)thr_malloc_umtx.m_owner == curtid)
71 thr_malloc_umtx_level++;
72 else
73 _thr_umutex_lock(&thr_malloc_umtx, curtid);
74 }
75
76 static void
thr_malloc_unlock(struct pthread * curthread)77 thr_malloc_unlock(struct pthread *curthread)
78 {
79
80 if (curthread == NULL)
81 return;
82 if (thr_malloc_umtx_level > 0)
83 thr_malloc_umtx_level--;
84 else
85 _thr_umutex_unlock(&thr_malloc_umtx, TID(curthread));
86 curthread->locklevel--;
87 _thr_ast(curthread);
88 }
89
90 void *
__thr_calloc(size_t num,size_t size)91 __thr_calloc(size_t num, size_t size)
92 {
93 struct pthread *curthread;
94 void *res;
95
96 curthread = _get_curthread();
97 thr_malloc_lock(curthread);
98 res = __crt_calloc(num, size);
99 thr_malloc_unlock(curthread);
100 return (res);
101 }
102
103 void
__thr_free(void * cp)104 __thr_free(void *cp)
105 {
106 struct pthread *curthread;
107
108 curthread = _get_curthread();
109 thr_malloc_lock(curthread);
110 __crt_free(cp);
111 thr_malloc_unlock(curthread);
112 }
113
114 void *
__thr_malloc(size_t nbytes)115 __thr_malloc(size_t nbytes)
116 {
117 struct pthread *curthread;
118 void *res;
119
120 curthread = _get_curthread();
121 thr_malloc_lock(curthread);
122 res = __crt_malloc(nbytes);
123 thr_malloc_unlock(curthread);
124 return (res);
125 }
126
127 void *
__thr_realloc(void * cp,size_t nbytes)128 __thr_realloc(void *cp, size_t nbytes)
129 {
130 struct pthread *curthread;
131 void *res;
132
133 curthread = _get_curthread();
134 thr_malloc_lock(curthread);
135 res = __crt_realloc(cp, nbytes);
136 thr_malloc_unlock(curthread);
137 return (res);
138 }
139
140 void
__thr_malloc_prefork(struct pthread * curthread)141 __thr_malloc_prefork(struct pthread *curthread)
142 {
143
144 _thr_umutex_lock(&thr_malloc_umtx, TID(curthread));
145 }
146
147 void
__thr_malloc_postfork(struct pthread * curthread)148 __thr_malloc_postfork(struct pthread *curthread)
149 {
150
151 _thr_umutex_unlock(&thr_malloc_umtx, TID(curthread));
152 }
153