ipf/libipf/rwlock_emul.c

14 void eMrwlock_read_enter(eMrwlock_t *rw, char *file, int line)
16 	if (rw->eMrw_magic != EMM_MAGIC) {
18 			rw->eMrw_owner, rw, rw->eMrw_magic);
21 	if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
24 			rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
27 	rw->eMrw_read++;
28 	rw->eMrw_heldin = file;
29 	rw->eMrw_heldat = line;
33 void eMrwlock_write_enter(eMrwlock_t *rw, char *file, int line)
35 	if (rw->eMrw_magic != EMM_MAGIC) {
37 			rw->eMrw_owner, rw, rw->eMrw_magic);
40 	if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
43 			rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
46 	rw->eMrw_write++;
47 	rw->eMrw_heldin = file;
48 	rw->eMrw_heldat = line;
52 void eMrwlock_try_upgrade(eMrwlock_t *rw, char *file, int line)
54 	if (rw->eMrw_magic != EMM_MAGIC) {
56 			rw->eMrw_owner, rw, rw->eMrw_magic);
59 	if (rw->eMrw_read != 0 || rw->eMrw_write != 0) {
62 			rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
65 	rw->eMrw_write++;
66 	rw->eMrw_heldin = file;
67 	rw->eMrw_heldat = line;
70 void eMrwlock_downgrade(eMrwlock_t *rw, char *file, int line)
72 	if (rw->eMrw_magic != EMM_MAGIC) {
74 			rw->eMrw_owner, rw, rw->eMrw_magic);
77 	if (rw->eMrw_read != 0 || rw->eMrw_write != 1) {
80 			rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
83 	rw->eMrw_write--;
84 	rw->eMrw_read++;
85 	rw->eMrw_heldin = file;
86 	rw->eMrw_heldat = line;
90 void eMrwlock_exit(eMrwlock_t *rw)
92 	if (rw->eMrw_magic != EMM_MAGIC) {
94 			rw->eMrw_owner, rw, rw->eMrw_magic);
97 	if (rw->eMrw_read != 1 && rw->eMrw_write != 1) {
99 			rw->eMrw_owner, rw, rw->eMrw_read, rw->eMrw_write);
102 	if (rw->eMrw_read == 1)
103 		rw->eMrw_read--;
104 	else if (rw->eMrw_write == 1)
105 		rw->eMrw_write--;
106 	rw->eMrw_heldin = NULL;
107 	rw->eMrw_heldat = 0;
113 void eMrwlock_init(eMrwlock_t *rw, char *who)
115 	if (rw->eMrw_magic == EMM_MAGIC) {	/* safe bet ? */
118 			rw->eMrw_owner, rw, rw->eMrw_magic);
121 	rw->eMrw_magic = EMM_MAGIC;
122 	rw->eMrw_read = 0;
123 	rw->eMrw_write = 0;
125 		rw->eMrw_owner = strdup(who);
127 		rw->eMrw_owner = NULL;
132 void eMrwlock_destroy(eMrwlock_t *rw)
134 	if (rw->eMrw_magic != EMM_MAGIC) {
136 			rw->eMrw_owner, rw, rw->eMrw_magic);
139 	if (rw->eMrw_owner != NULL)
140 		free(rw->eMrw_owner);
141 	memset(rw, 0xa5, sizeof(*rw));