1 /* $FreeBSD: stable/12/sbin/ipf/libipf/mutex_emul.c 371558 2022-02-07 13:57:08Z cy $ */
2
3 /*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 * $Id$
9 */
10
11 #include "ipf.h"
12
13 #define EMM_MAGIC 0x9d7adba3
14
15 static int mutex_debug = 0;
16 static FILE *mutex_file = NULL;
17 static int initcount = 0;
18
19 void
eMmutex_enter(eMmutex_t * mtx,char * file,int line)20 eMmutex_enter(eMmutex_t *mtx, char *file, int line)
21 {
22 if (mutex_debug & 2)
23 fprintf(mutex_file, "%s:%d:eMmutex_enter(%s)\n", file, line,
24 mtx->eMm_owner);
25 if (mtx->eMm_magic != EMM_MAGIC) {
26 fprintf(stderr, "%s:eMmutex_enter(%p): bad magic: %#x\n",
27 mtx->eMm_owner, mtx, mtx->eMm_magic);
28 abort();
29 }
30 if (mtx->eMm_held != 0) {
31 fprintf(stderr, "%s:eMmutex_enter(%p): already locked: %d\n",
32 mtx->eMm_owner, mtx, mtx->eMm_held);
33 abort();
34 }
35 mtx->eMm_held++;
36 mtx->eMm_heldin = file;
37 mtx->eMm_heldat = line;
38 }
39
40
41 void
eMmutex_exit(eMmutex_t * mtx,char * file,int line)42 eMmutex_exit(eMmutex_t *mtx, char *file, int line)
43 {
44 if (mutex_debug & 2)
45 fprintf(mutex_file, "%s:%d:eMmutex_exit(%s)\n", file, line,
46 mtx->eMm_owner);
47 if (mtx->eMm_magic != EMM_MAGIC) {
48 fprintf(stderr, "%s:eMmutex_exit(%p): bad magic: %#x\n",
49 mtx->eMm_owner, mtx, mtx->eMm_magic);
50 abort();
51 }
52 if (mtx->eMm_held != 1) {
53 fprintf(stderr, "%s:eMmutex_exit(%p): not locked: %d\n",
54 mtx->eMm_owner, mtx, mtx->eMm_held);
55 abort();
56 }
57 mtx->eMm_held--;
58 mtx->eMm_heldin = NULL;
59 mtx->eMm_heldat = 0;
60 }
61
62
63 void
eMmutex_init(eMmutex_t * mtx,char * who,char * file,int line)64 eMmutex_init(eMmutex_t *mtx, char *who, char *file, int line)
65 {
66 if (mutex_file == NULL && mutex_debug)
67 mutex_file = fopen("ipf_mutex_log", "w");
68 if (mutex_debug & 1)
69 fprintf(mutex_file, "%s:%d:eMmutex_init(%p,%s)\n",
70 file, line, mtx, who);
71 if (mtx->eMm_magic == EMM_MAGIC) { /* safe bet ? */
72 fprintf(stderr,
73 "%s:eMmutex_init(%p): already initialised?: %#x\n",
74 mtx->eMm_owner, mtx, mtx->eMm_magic);
75 abort();
76 }
77 mtx->eMm_magic = EMM_MAGIC;
78 mtx->eMm_held = 0;
79 if (who != NULL)
80 mtx->eMm_owner = strdup(who);
81 else
82 mtx->eMm_owner = NULL;
83 initcount++;
84 }
85
86
87 void
eMmutex_destroy(mtx,file,line)88 eMmutex_destroy(mtx, file, line)
89 eMmutex_t *mtx;
90 char *file;
91 int line;
92 {
93 if (mutex_debug & 1)
94 fprintf(mutex_file,
95 "%s:%d:eMmutex_destroy(%p,%s)\n", file, line,
96 mtx, mtx->eMm_owner);
97 if (mtx->eMm_magic != EMM_MAGIC) {
98 fprintf(stderr, "%s:eMmutex_destroy(%p): bad magic: %#x\n",
99 mtx->eMm_owner, mtx, mtx->eMm_magic);
100 abort();
101 }
102 if (mtx->eMm_held != 0) {
103 fprintf(stderr,
104 "%s:eMmutex_enter(%p): still locked: %d\n",
105 mtx->eMm_owner, mtx, mtx->eMm_held);
106 abort();
107 }
108 if (mtx->eMm_owner != NULL)
109 free(mtx->eMm_owner);
110 memset(mtx, 0xa5, sizeof(*mtx));
111 initcount--;
112 }
113
114
115 void
ipf_mutex_clean(void)116 ipf_mutex_clean(void)
117 {
118 if (initcount != 0) {
119 if (mutex_file)
120 fprintf(mutex_file, "initcount %d\n", initcount);
121 abort();
122 }
123 }
124