4 * Copyright (C) 2012 by Darren Reed.
6 * See the IPFILTER.LICENCE file for details on licencing.
13 #define EMM_MAGIC 0x97dd8b3a
15 void eMrwlock_read_enter(rw, file, line)
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);
25 if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
27 "%s:eMrwlock_read_enter(%p): already locked: %d/%d\n",
28 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
32 rw->eMrw_heldin = file;
33 rw->eMrw_heldat = line;
37 void eMrwlock_write_enter(rw, file, line)
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);
47 if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
49 "%s:eMrwlock_write_enter(%p): already locked: %d/%d\n",
50 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
54 rw->eMrw_heldin = file;
55 rw->eMrw_heldat = line;
59 void eMrwlock_try_upgrade(rw, file, line)
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);
69 if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
71 "%s:eMrwlock_try_upgrade(%p): already locked: %d/%d\n",
72 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
76 rw->eMrw_heldin = file;
77 rw->eMrw_heldat = line;
80 void eMrwlock_downgrade(rw, file, line)
85 if (rw->eMrw_magic != EMM_MAGIC) {
86 fprintf(stderr, "%s:eMrwlock_write_enter(%p): bad magic: %#x\n",
87 rw->eMrw_owner, rw, rw->eMrw_magic);
90 if (rw->eMrw_read != 0 || rw->eMrw_write != 1) {
92 "%s:eMrwlock_write_enter(%p): already locked: %d/%d\n",
93 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
98 rw->eMrw_heldin = file;
99 rw->eMrw_heldat = line;
103 void eMrwlock_exit(rw)
106 if (rw->eMrw_magic != EMM_MAGIC) {
107 fprintf(stderr, "%s:eMrwlock_exit(%p): bad magic: %#x\n",
108 rw->eMrw_owner, rw, rw->eMrw_magic);
111 if (rw->eMrw_read != 1 && rw->eMrw_write != 1) {
112 fprintf(stderr, "%s:eMrwlock_exit(%p): not locked: %d/%d\n",
113 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
116 if (rw->eMrw_read == 1)
118 else if (rw->eMrw_write == 1)
120 rw->eMrw_heldin = NULL;
125 static int initcount = 0;
127 void eMrwlock_init(rw, who)
131 if (rw->eMrw_magic == EMM_MAGIC) { /* safe bet ? */
133 "%s:eMrwlock_init(%p): already initialised?: %#x\n",
134 rw->eMrw_owner, rw, rw->eMrw_magic);
137 rw->eMrw_magic = EMM_MAGIC;
141 rw->eMrw_owner = strdup(who);
143 rw->eMrw_owner = NULL;
148 void eMrwlock_destroy(rw)
151 if (rw->eMrw_magic != EMM_MAGIC) {
152 fprintf(stderr, "%s:eMrwlock_destroy(%p): bad magic: %#x\n",
153 rw->eMrw_owner, rw, rw->eMrw_magic);
156 if (rw->eMrw_owner != NULL)
157 free(rw->eMrw_owner);
158 memset(rw, 0xa5, sizeof(*rw));
162 void ipf_rwlock_clean()