287 lines
6.6 KiB
C
287 lines
6.6 KiB
C
/*
|
|
* Copyright (c) 2001 Alexander Kabaev
|
|
* 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
|
|
* in this position and unchanged.
|
|
* 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. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <sys/cdefs.h>
|
|
#include <stdlib.h>
|
|
#include <rtld_lock.h>
|
|
#include "thr_private.h"
|
|
|
|
static void *_thr_rtld_lock_create();
|
|
static void _thr_rtld_lock_destroy(void *);
|
|
static void _thr_rtld_rlock_acquire(void *);
|
|
static void _thr_rtld_wlock_acquire(void *);
|
|
static void _thr_rtld_lock_release(void *);
|
|
static int _thr_rtld_set_flag(int);
|
|
static int _thr_rtld_clr_flag(int);
|
|
|
|
#ifdef NOTYET
|
|
static void *
|
|
_thr_rtld_lock_create()
|
|
{
|
|
pthread_rwlock_t prwlock;
|
|
if (_pthread_rwlock_init(&prwlock, NULL))
|
|
return (NULL);
|
|
return (prwlock);
|
|
}
|
|
|
|
static void
|
|
_thr_rtld_lock_destroy(void *lock)
|
|
{
|
|
pthread_rwlock_t prwlock = (pthread_rwlock_t)lock;
|
|
if (prwlock != NULL)
|
|
_pthread_rwlock_destroy(&prwlock);
|
|
}
|
|
|
|
static void
|
|
_thr_rtld_rlock_acquire(void *lock)
|
|
{
|
|
pthread_rwlock_t prwlock = (pthread_rwlock_t)lock;
|
|
_thr_rwlock_rdlock(&prwlock);
|
|
}
|
|
|
|
static void
|
|
_thr_rtld_wlock_acquire(void *lock)
|
|
{
|
|
pthread_rwlock_t prwlock = (pthread_rwlock_t)lock;
|
|
_thr_rwlock_wrlock(&prwlock);
|
|
}
|
|
|
|
static void
|
|
_thr_rtld_lock_release(void *lock)
|
|
{
|
|
pthread_rwlock_t prwlock = (pthread_rwlock_t)lock;
|
|
_thr_rwlock_unlock(&prwlock);
|
|
}
|
|
|
|
|
|
static int
|
|
_thr_rtld_set_flag(int mask)
|
|
{
|
|
struct pthread *curthread;
|
|
int bits;
|
|
|
|
curthread = _get_curthread();
|
|
|
|
if (curthread != NULL) {
|
|
bits = curthread->rtld_bits;
|
|
curthread->rtld_bits |= mask;
|
|
} else {
|
|
bits = 0;
|
|
PANIC("No current thread in rtld call");
|
|
}
|
|
|
|
return (bits);
|
|
}
|
|
|
|
static int
|
|
_thr_rtld_clr_flag(int mask)
|
|
{
|
|
struct pthread *curthread;
|
|
int bits;
|
|
|
|
curthread = _get_curthread();
|
|
|
|
if (curthread != NULL) {
|
|
bits = curthread->rtld_bits;
|
|
curthread->rtld_bits &= ~mask;
|
|
} else {
|
|
bits = 0;
|
|
PANIC("No current thread in rtld call");
|
|
}
|
|
return (bits);
|
|
}
|
|
|
|
void
|
|
_thr_rtld_init()
|
|
{
|
|
struct RtldLockInfo li;
|
|
li.lock_create = _thr_rtld_lock_create;
|
|
li.lock_destroy = _thr_rtld_lock_destroy;
|
|
li.rlock_acquire = _thr_rtld_rlock_acquire;
|
|
li.wlock_acquire = _thr_rtld_wlock_acquire;
|
|
li.lock_release = _thr_rtld_lock_release;
|
|
li.thread_set_flag = _thr_rtld_set_flag;
|
|
li.thread_clr_flag = _thr_rtld_clr_flag;
|
|
li.at_fork = NULL;
|
|
_rtld_thread_init(&li);
|
|
}
|
|
|
|
void
|
|
_thr_rtld_fini()
|
|
{
|
|
_rtld_thread_init(NULL);
|
|
}
|
|
#endif
|
|
|
|
struct rtld_kse_lock {
|
|
struct lock lck;
|
|
struct kse *owner;
|
|
kse_critical_t crit;
|
|
int count;
|
|
int write;
|
|
};
|
|
|
|
static void *
|
|
_thr_rtld_lock_create()
|
|
{
|
|
struct rtld_kse_lock *l = malloc(sizeof(struct rtld_kse_lock));
|
|
|
|
_lock_init(&l->lck, LCK_ADAPTIVE, _kse_lock_wait, _kse_lock_wakeup);
|
|
l->owner = NULL;
|
|
l->count = 0;
|
|
l->write = 0;
|
|
return (l);
|
|
}
|
|
|
|
static void
|
|
_thr_rtld_lock_destroy(void *lock)
|
|
{
|
|
/* XXX We really can not free memory after a fork() */
|
|
#if 0
|
|
struct rtld_kse_lock *l = (struct rtld_kse_lock *)lock;
|
|
|
|
_lock_destroy(&l->lck);
|
|
free(l);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
static void
|
|
_thr_rtld_rlock_acquire(void *lock)
|
|
{
|
|
struct rtld_kse_lock *l = (struct rtld_kse_lock *)lock;
|
|
kse_critical_t crit;
|
|
struct kse *curkse;
|
|
|
|
crit = _kse_critical_enter();
|
|
curkse = _get_curkse();
|
|
if (l->owner == curkse) {
|
|
l->count++;
|
|
_kse_critical_leave(crit); /* probably not necessary */
|
|
} else {
|
|
KSE_LOCK_ACQUIRE(curkse, &l->lck);
|
|
l->crit = crit;
|
|
l->owner = curkse;
|
|
l->count = 1;
|
|
l->write = 0;
|
|
}
|
|
}
|
|
|
|
static void
|
|
_thr_rtld_wlock_acquire(void *lock)
|
|
{
|
|
struct rtld_kse_lock *l = (struct rtld_kse_lock *)lock;
|
|
kse_critical_t crit;
|
|
struct kse *curkse;
|
|
|
|
crit = _kse_critical_enter();
|
|
curkse = _get_curkse();
|
|
if (l->owner == curkse) {
|
|
_kse_critical_leave(crit);
|
|
PANIC("Recursive write lock attempt on rtld lock");
|
|
} else {
|
|
KSE_LOCK_ACQUIRE(curkse, &l->lck);
|
|
l->crit = crit;
|
|
l->owner = curkse;
|
|
l->count = 1;
|
|
l->write = 1;
|
|
}
|
|
}
|
|
|
|
static void
|
|
_thr_rtld_lock_release(void *lock)
|
|
{
|
|
struct rtld_kse_lock *l = (struct rtld_kse_lock *)lock;
|
|
kse_critical_t crit;
|
|
struct kse *curkse;
|
|
|
|
crit = _kse_critical_enter();
|
|
curkse = _get_curkse();
|
|
if (l->owner != curkse) {
|
|
/*
|
|
* We might want to forcibly unlock the rtld lock
|
|
* and/or disable threaded mode so there is better
|
|
* chance that the panic will work. Otherwise,
|
|
* we could end up trying to take the rtld lock
|
|
* again.
|
|
*/
|
|
_kse_critical_leave(crit);
|
|
PANIC("Attempt to unlock rtld lock when not owner.");
|
|
} else {
|
|
l->count--;
|
|
if (l->count == 0) {
|
|
/*
|
|
* If there ever is a count associated with
|
|
* _kse_critical_leave(), we'll need to add
|
|
* another call to it here with the crit
|
|
* value from above.
|
|
*/
|
|
crit = l->crit;
|
|
l->owner = NULL;
|
|
l->write = 0;
|
|
KSE_LOCK_RELEASE(curkse, &l->lck);
|
|
}
|
|
_kse_critical_leave(crit);
|
|
}
|
|
}
|
|
|
|
|
|
static int
|
|
_thr_rtld_set_flag(int mask)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
_thr_rtld_clr_flag(int mask)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
_thr_rtld_init()
|
|
{
|
|
struct RtldLockInfo li;
|
|
li.lock_create = _thr_rtld_lock_create;
|
|
li.lock_destroy = _thr_rtld_lock_destroy;
|
|
li.rlock_acquire = _thr_rtld_rlock_acquire;
|
|
li.wlock_acquire = _thr_rtld_wlock_acquire;
|
|
li.lock_release = _thr_rtld_lock_release;
|
|
li.thread_set_flag = _thr_rtld_set_flag;
|
|
li.thread_clr_flag = _thr_rtld_clr_flag;
|
|
li.at_fork = NULL;
|
|
_rtld_thread_init(&li);
|
|
}
|
|
|
|
void
|
|
_thr_rtld_fini()
|
|
{
|
|
_rtld_thread_init(NULL);
|
|
}
|