1 #include <port_before.h>
11 #include <port_after.h>
14 static pthread_key_t key;
15 static int mt_key_initialized = 0;
17 static int __res_init_ctx(void);
18 static void __res_destroy_ctx(void *);
20 #if defined(sun) && !defined(__GNUC__)
21 #pragma init (_mtctxres_init)
25 static mtctxres_t sharedctx;
29 * Initialize the TSD key. By doing this at library load time, we're
30 * implicitly running without interference from other threads, so there's
31 * no need for locking.
34 _mtctxres_init(void) {
35 int pthread_keycreate_ret;
37 pthread_keycreate_ret = pthread_key_create(&key, __res_destroy_ctx);
38 if (pthread_keycreate_ret == 0)
39 mt_key_initialized = 1;
44 * To support binaries that used the private MT-safe interface in
45 * Solaris 8, we still need to provide the __res_enable_mt()
46 * and __res_disable_mt() entry points. They're do-nothing routines.
49 __res_enable_mt(void) {
54 __res_disable_mt(void) {
60 __res_init_ctx(void) {
66 if (pthread_getspecific(key) != 0) {
71 if ((mt = malloc(sizeof (mtctxres_t))) == 0) {
76 memset(mt, 0, sizeof (mtctxres_t));
78 if ((ret = pthread_setspecific(key, mt)) != 0) {
88 __res_destroy_ctx(void *value) {
90 mtctxres_t *mt = (mtctxres_t *)value;
103 * This if clause should only be executed if we are linking
104 * statically. When linked dynamically _mtctxres_init() should
105 * be called at binding time due the #pragma above.
107 if (!mt_key_initialized) {
108 static pthread_mutex_t keylock = PTHREAD_MUTEX_INITIALIZER;
109 if (pthread_mutex_lock(&keylock) == 0) {
111 (void) pthread_mutex_unlock(&keylock);
116 * If we have already been called in this thread return the existing
117 * context. Otherwise recreat a new context and return it. If
118 * that fails return a global context.
120 if (mt_key_initialized) {
121 if (((mt = pthread_getspecific(key)) != 0) ||
122 (__res_init_ctx() == 0 &&
123 (mt = pthread_getspecific(key)) != 0)) {