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