1 /* $NetBSD: rwlock_emul.c,v 1.2 2012/07/22 14:27:37 darrenr Exp $ */
2
3 /*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 * Id: rwlock_emul.c,v 1.1.1.2 2012/07/22 13:44:42 darrenr Exp $
9 */
10
11 #include "ipf.h"
12
13 #define EMM_MAGIC 0x97dd8b3a
14
eMrwlock_read_enter(rw,file,line)15 void eMrwlock_read_enter(rw, file, line)
16 eMrwlock_t *rw;
17 char *file;
18 int line;
19 {
20 if (rw->eMrw_magic != EMM_MAGIC) {
21 fprintf(stderr, "%s:eMrwlock_read_enter(%p): bad magic: %#x\n",
22 rw->eMrw_owner, rw, rw->eMrw_magic);
23 abort();
24 }
25 if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
26 fprintf(stderr,
27 "%s:eMrwlock_read_enter(%p): already locked: %d/%d\n",
28 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
29 abort();
30 }
31 rw->eMrw_read++;
32 rw->eMrw_heldin = file;
33 rw->eMrw_heldat = line;
34 }
35
36
eMrwlock_write_enter(rw,file,line)37 void eMrwlock_write_enter(rw, file, line)
38 eMrwlock_t *rw;
39 char *file;
40 int line;
41 {
42 if (rw->eMrw_magic != EMM_MAGIC) {
43 fprintf(stderr, "%s:eMrwlock_write_enter(%p): bad magic: %#x\n",
44 rw->eMrw_owner, rw, rw->eMrw_magic);
45 abort();
46 }
47 if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
48 fprintf(stderr,
49 "%s:eMrwlock_write_enter(%p): already locked: %d/%d\n",
50 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
51 abort();
52 }
53 rw->eMrw_write++;
54 rw->eMrw_heldin = file;
55 rw->eMrw_heldat = line;
56 }
57
58
eMrwlock_downgrade(rw,file,line)59 void eMrwlock_downgrade(rw, file, line)
60 eMrwlock_t *rw;
61 char *file;
62 int line;
63 {
64 if (rw->eMrw_magic != EMM_MAGIC) {
65 fprintf(stderr, "%s:eMrwlock_write_enter(%p): bad magic: %#x\n",
66 rw->eMrw_owner, rw, rw->eMrw_magic);
67 abort();
68 }
69 if (rw->eMrw_read != 0 || rw->eMrw_write != 1) {
70 fprintf(stderr,
71 "%s:eMrwlock_write_enter(%p): already locked: %d/%d\n",
72 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
73 abort();
74 }
75 rw->eMrw_write--;
76 rw->eMrw_read++;
77 rw->eMrw_heldin = file;
78 rw->eMrw_heldat = line;
79 }
80
81
eMrwlock_exit(rw)82 void eMrwlock_exit(rw)
83 eMrwlock_t *rw;
84 {
85 if (rw->eMrw_magic != EMM_MAGIC) {
86 fprintf(stderr, "%s:eMrwlock_exit(%p): bad magic: %#x\n",
87 rw->eMrw_owner, rw, rw->eMrw_magic);
88 abort();
89 }
90 if (rw->eMrw_read != 1 && rw->eMrw_write != 1) {
91 fprintf(stderr, "%s:eMrwlock_exit(%p): not locked: %d/%d\n",
92 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
93 abort();
94 }
95 if (rw->eMrw_read == 1)
96 rw->eMrw_read--;
97 else if (rw->eMrw_write == 1)
98 rw->eMrw_write--;
99 rw->eMrw_heldin = NULL;
100 rw->eMrw_heldat = 0;
101 }
102
103
104 static int initcount = 0;
105
eMrwlock_init(rw,who)106 void eMrwlock_init(rw, who)
107 eMrwlock_t *rw;
108 char *who;
109 {
110 if (rw->eMrw_magic == EMM_MAGIC) { /* safe bet ? */
111 fprintf(stderr,
112 "%s:eMrwlock_init(%p): already initialised?: %#x\n",
113 rw->eMrw_owner, rw, rw->eMrw_magic);
114 abort();
115 }
116 rw->eMrw_magic = EMM_MAGIC;
117 rw->eMrw_read = 0;
118 rw->eMrw_write = 0;
119 if (who != NULL)
120 rw->eMrw_owner = strdup(who);
121 else
122 rw->eMrw_owner = NULL;
123 initcount++;
124 }
125
126
eMrwlock_destroy(rw)127 void eMrwlock_destroy(rw)
128 eMrwlock_t *rw;
129 {
130 if (rw->eMrw_magic != EMM_MAGIC) {
131 fprintf(stderr, "%s:eMrwlock_destroy(%p): bad magic: %#x\n",
132 rw->eMrw_owner, rw, rw->eMrw_magic);
133 abort();
134 }
135 if (rw->eMrw_owner != NULL)
136 free(rw->eMrw_owner);
137 memset(rw, 0xa5, sizeof(*rw));
138 initcount--;
139 }
140
ipf_rwlock_clean()141 void ipf_rwlock_clean()
142 {
143 if (initcount != 0)
144 abort();
145 }
146