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_downgrade(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 != 1) {
71 "%s:eMrwlock_write_enter(%p): already locked: %d/%d\n",
72 rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
77 rw->eMrw_heldin = file;
78 rw->eMrw_heldat = line;
82 void eMrwlock_exit(rw)
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);
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);
95 if (rw->eMrw_read == 1)
97 else if (rw->eMrw_write == 1)
99 rw->eMrw_heldin = NULL;
104 static int initcount = 0;
106 void eMrwlock_init(rw, who)
110 if (rw->eMrw_magic == EMM_MAGIC) { /* safe bet ? */
112 "%s:eMrwlock_init(%p): already initialised?: %#x\n",
113 rw->eMrw_owner, rw, rw->eMrw_magic);
116 rw->eMrw_magic = EMM_MAGIC;
120 rw->eMrw_owner = strdup(who);
122 rw->eMrw_owner = NULL;
127 void eMrwlock_destroy(rw)
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);
135 if (rw->eMrw_owner != NULL)
136 free(rw->eMrw_owner);
137 memset(rw, 0xa5, sizeof(*rw));
141 void ipf_rwlock_clean()