ipfilter/lib/rwlock_emul.c

15 void eMrwlock_read_enter(rw, file, line)
16 	eMrwlock_t *rw;
20 	if (rw->eMrw_magic != EMM_MAGIC) {
22 			rw->eMrw_owner, rw, rw->eMrw_magic);
25 	if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
28 			rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
31 	rw->eMrw_read++;
32 	rw->eMrw_heldin = file;
33 	rw->eMrw_heldat = line;
37 void eMrwlock_write_enter(rw, file, line)
38 	eMrwlock_t *rw;
42 	if (rw->eMrw_magic != EMM_MAGIC) {
44 			rw->eMrw_owner, rw, rw->eMrw_magic);
47 	if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
50 			rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
53 	rw->eMrw_write++;
54 	rw->eMrw_heldin = file;
55 	rw->eMrw_heldat = line;
59 void eMrwlock_try_upgrade(rw, file, line)
60 	eMrwlock_t *rw;
64 	if (rw->eMrw_magic != EMM_MAGIC) {
66 			rw->eMrw_owner, rw, rw->eMrw_magic);
69 	if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
72 			rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
75 	rw->eMrw_write++;
76 	rw->eMrw_heldin = file;
77 	rw->eMrw_heldat = line;
80 void eMrwlock_downgrade(rw, file, line)
81 	eMrwlock_t *rw;
85 	if (rw->eMrw_magic != EMM_MAGIC) {
87 			rw->eMrw_owner, rw, rw->eMrw_magic);
90 	if (rw->eMrw_read != 0 || rw->eMrw_write != 1) {
93 			rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
96 	rw->eMrw_write--;
97 	rw->eMrw_read++;
98 	rw->eMrw_heldin = file;
99 	rw->eMrw_heldat = line;
103 void eMrwlock_exit(rw)
104 	eMrwlock_t *rw;
106 	if (rw->eMrw_magic != EMM_MAGIC) {
108 			rw->eMrw_owner, rw, rw->eMrw_magic);
111 	if (rw->eMrw_read != 1 && rw->eMrw_write != 1) {
113 			rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
116 	if (rw->eMrw_read == 1)
117 		rw->eMrw_read--;
118 	else if (rw->eMrw_write == 1)
119 		rw->eMrw_write--;
120 	rw->eMrw_heldin = NULL;
121 	rw->eMrw_heldat = 0;
127 void eMrwlock_init(rw, who)
128 	eMrwlock_t *rw;
131 	if (rw->eMrw_magic == EMM_MAGIC) {	/* safe bet ? */
134 			rw->eMrw_owner, rw, rw->eMrw_magic);
137 	rw->eMrw_magic = EMM_MAGIC;
138 	rw->eMrw_read = 0;
139 	rw->eMrw_write = 0;
141 		rw->eMrw_owner = strdup(who);
143 		rw->eMrw_owner = NULL;
148 void eMrwlock_destroy(rw)
149 	eMrwlock_t *rw;
151 	if (rw->eMrw_magic != EMM_MAGIC) {
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));