/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <sys/mman.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <pthread.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "thr_private.h"
/* Used in symbol lookup of libthread_db */
struct pthread_key _thread_keytable[PTHREAD_KEYS_MAX];
__weak_reference(_pthread_key_create, pthread_key_create);
__weak_reference(_pthread_key_delete, pthread_key_delete);
__weak_reference(_pthread_getspecific, pthread_getspecific);
__weak_reference(_pthread_setspecific, pthread_setspecific);
int
_pthread_key_create(pthread_key_t *key, void (*destructor)(void *))
{
struct pthread *curthread;
int i;
_thr_check_init();
curthread = _get_curthread();
THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
for (i = 0; i < PTHREAD_KEYS_MAX; i++) {
if (_thread_keytable[i].allocated == 0) {
_thread_keytable[i].allocated = 1;
_thread_keytable[i].destructor = destructor;
_thread_keytable[i].seqno++;
THR_LOCK_RELEASE(curthread, &_keytable_lock);
*key = i + 1;
return (0);
}
}
THR_LOCK_RELEASE(curthread, &_keytable_lock);
return (EAGAIN);
}
int
_pthread_key_delete(pthread_key_t userkey)
{
struct pthread *curthread;
int key, ret;
key = userkey - 1;
if ((unsigned int)key >= PTHREAD_KEYS_MAX)
return (EINVAL);
curthread = _get_curthread();
THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
if (_thread_keytable[key].allocated) {
_thread_keytable[key].allocated = 0;
ret = 0;
} else {
ret = EINVAL;
}
THR_LOCK_RELEASE(curthread, &_keytable_lock);
return (ret);
}
void
_thread_cleanupspecific(void)
{
struct pthread *curthread;
void (*destructor)(void *);
const void *data;
int i, key;
curthread = _get_curthread();
if (curthread->specific == NULL)
return;
THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
for (i = 0; i < PTHREAD_DESTRUCTOR_ITERATIONS &&
curthread->specific_data_count > 0; i++) {
for (key = 0; key < PTHREAD_KEYS_MAX &&
curthread->specific_data_count > 0; key++) {
destructor = NULL;
if (_thread_keytable[key].allocated &&
(curthread->specific[key].data != NULL)) {
if (curthread->specific[key].seqno ==
_thread_keytable[key].seqno) {
data = curthread->specific[key].data;
destructor = _thread_keytable[key].
destructor;
}
curthread->specific[key].data = NULL;
curthread->specific_data_count--;
} else if (curthread->specific[key].data != NULL) {
/*
* This can happen if the key is
* deleted via pthread_key_delete
* without first setting the value to
* NULL in all threads. POSIX says
* that the destructor is not invoked
* in this case.
*/
curthread->specific[key].data = NULL;
curthread->specific_data_count--;
}
/*
* If there is a destructor, call it with the
* key table entry unlocked.
*/
if (destructor != NULL) {
THR_LOCK_RELEASE(curthread, &_keytable_lock);
destructor(__DECONST(void *, data));
THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
}
}
}
THR_LOCK_RELEASE(curthread, &_keytable_lock);
munmap(curthread->specific, PTHREAD_KEYS_MAX * sizeof(struct
pthread_specific_elem));
curthread->specific = NULL;
if (curthread->specific_data_count > 0) {
stderr_debug("Thread %p has exited with leftover "
"thread-specific data after %d destructor iterations\n",
curthread, PTHREAD_DESTRUCTOR_ITERATIONS);
}
}
int
_pthread_setspecific(pthread_key_t userkey, const void *value)
{
struct pthread *pthread;
void *tmp;
pthread_key_t key;
key = userkey - 1;
if ((unsigned int)key >= PTHREAD_KEYS_MAX ||
!_thread_keytable[key].allocated)
return (EINVAL);
pthread = _get_curthread();
if (pthread->specific == NULL) {
tmp = mmap(NULL, PTHREAD_KEYS_MAX *
sizeof(struct pthread_specific_elem),
PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
if (tmp == MAP_FAILED)
return (ENOMEM);
pthread->specific = tmp;
}
if (pthread->specific[key].data == NULL) {
if (value != NULL)
pthread->specific_data_count++;
} else if (value == NULL)
pthread->specific_data_count--;
pthread->specific[key].data = value;
pthread->specific[key].seqno = _thread_keytable[key].seqno;
return (0);
}
void *
_pthread_getspecific(pthread_key_t userkey)
{
struct pthread *pthread;
const void *data;
pthread_key_t key;
/* Check if there is specific data. */
key = userkey - 1;
if ((unsigned int)key >= PTHREAD_KEYS_MAX)
return (NULL);
pthread = _get_curthread();
/* Check if this key has been used before. */
if (_thread_keytable[key].allocated && pthread->specific != NULL &&
pthread->specific[key].seqno == _thread_keytable[key].seqno) {
/* Return the value: */
data = pthread->specific[key].data;
} else {
/*
* This key has not been used before, so return NULL
* instead.
*/
data = NULL;
}
return (__DECONST(void *, data));
}
void
_thr_tsd_unload(struct dl_phdr_info *phdr_info)
{
struct pthread *curthread;
void (*destructor)(void *);
int key;
curthread = _get_curthread();
THR_LOCK_ACQUIRE(curthread, &_keytable_lock);
for (key = 0; key < PTHREAD_KEYS_MAX; key++) {
if (!_thread_keytable[key].allocated)
continue;
destructor = _thread_keytable[key].destructor;
if (destructor == NULL)
continue;
if (__elf_phdr_match_addr(phdr_info, destructor))
_thread_keytable[key].destructor = NULL;
}
THR_LOCK_RELEASE(curthread, &_keytable_lock);
}
