mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-23 03:06:48 +00:00
559a218c9b
These sys/cdefs.h are not needed. Purge them. They are mostly left-over from the $FreeBSD$ removal. A few in libc are still required for macros that cdefs.h defines. Keep those. Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D42385
136 lines
2.6 KiB
C
136 lines
2.6 KiB
C
#include <port_before.h>
|
|
#ifdef DO_PTHREADS
|
|
#include <pthread.h>
|
|
#ifdef _LIBC
|
|
#include <pthread_np.h>
|
|
#endif
|
|
#endif
|
|
#include <errno.h>
|
|
#include <netdb.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <resolv_mt.h>
|
|
#include <port_after.h>
|
|
|
|
#ifdef DO_PTHREADS
|
|
static pthread_key_t key;
|
|
static int mt_key_initialized = 0;
|
|
|
|
static int __res_init_ctx(void);
|
|
static void __res_destroy_ctx(void *);
|
|
|
|
#if defined(sun) && !defined(__GNUC__)
|
|
#pragma init (_mtctxres_init)
|
|
#endif
|
|
#endif
|
|
|
|
static mtctxres_t sharedctx;
|
|
|
|
#ifdef DO_PTHREADS
|
|
/*
|
|
* Initialize the TSD key. By doing this at library load time, we're
|
|
* implicitly running without interference from other threads, so there's
|
|
* no need for locking.
|
|
*/
|
|
static void
|
|
_mtctxres_init(void) {
|
|
int pthread_keycreate_ret;
|
|
|
|
pthread_keycreate_ret = pthread_key_create(&key, __res_destroy_ctx);
|
|
if (pthread_keycreate_ret == 0)
|
|
mt_key_initialized = 1;
|
|
}
|
|
#endif
|
|
|
|
#ifndef _LIBC
|
|
/*
|
|
* To support binaries that used the private MT-safe interface in
|
|
* Solaris 8, we still need to provide the __res_enable_mt()
|
|
* and __res_disable_mt() entry points. They're do-nothing routines.
|
|
*/
|
|
int
|
|
__res_enable_mt(void) {
|
|
return (-1);
|
|
}
|
|
|
|
int
|
|
__res_disable_mt(void) {
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
#ifdef DO_PTHREADS
|
|
static int
|
|
__res_init_ctx(void) {
|
|
|
|
mtctxres_t *mt;
|
|
int ret;
|
|
|
|
|
|
if (pthread_getspecific(key) != 0) {
|
|
/* Already exists */
|
|
return (0);
|
|
}
|
|
|
|
if ((mt = malloc(sizeof(mtctxres_t))) == NULL) {
|
|
errno = ENOMEM;
|
|
return (-1);
|
|
}
|
|
|
|
memset(mt, 0, sizeof (mtctxres_t));
|
|
|
|
if ((ret = pthread_setspecific(key, mt)) != 0) {
|
|
free(mt);
|
|
errno = ret;
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
__res_destroy_ctx(void *value) {
|
|
|
|
free(value);
|
|
}
|
|
#endif
|
|
|
|
mtctxres_t *
|
|
___mtctxres(void) {
|
|
#ifdef DO_PTHREADS
|
|
mtctxres_t *mt;
|
|
|
|
#ifdef _LIBC
|
|
if (pthread_main_np() != 0)
|
|
return (&sharedctx);
|
|
#endif
|
|
|
|
/*
|
|
* This if clause should only be executed if we are linking
|
|
* statically. When linked dynamically _mtctxres_init() should
|
|
* be called at binding time due the #pragma above.
|
|
*/
|
|
if (!mt_key_initialized) {
|
|
static pthread_mutex_t keylock = PTHREAD_MUTEX_INITIALIZER;
|
|
if (pthread_mutex_lock(&keylock) == 0) {
|
|
_mtctxres_init();
|
|
(void) pthread_mutex_unlock(&keylock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we have already been called in this thread return the existing
|
|
* context. Otherwise recreat a new context and return it. If
|
|
* that fails return a global context.
|
|
*/
|
|
if (mt_key_initialized) {
|
|
if (((mt = pthread_getspecific(key)) != NULL) ||
|
|
(__res_init_ctx() == 0 &&
|
|
(mt = pthread_getspecific(key)) != NULL)) {
|
|
return (mt);
|
|
}
|
|
}
|
|
#endif
|
|
return (&sharedctx);
|
|
}
|