mirror of
https://github.com/samba-team/samba.git
synced 2024-12-25 23:21:54 +03:00
560 lines
11 KiB
C
560 lines
11 KiB
C
/*
|
|
* Copyright (c) 2010 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* All rights reserved.
|
|
*
|
|
* Portions Copyright (c) 2010 Apple Inc. 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 Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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 "baselocl.h"
|
|
#include <syslog.h>
|
|
|
|
static heim_base_atomic_type tidglobal = HEIM_TID_USER;
|
|
|
|
struct heim_base {
|
|
heim_type_t isa;
|
|
heim_base_atomic_type ref_cnt;
|
|
HEIM_TAILQ_ENTRY(heim_base) autorel;
|
|
heim_auto_release_t autorelpool;
|
|
uintptr_t isaextra[3];
|
|
};
|
|
|
|
/* specialized version of base */
|
|
struct heim_base_mem {
|
|
heim_type_t isa;
|
|
heim_base_atomic_type ref_cnt;
|
|
HEIM_TAILQ_ENTRY(heim_base) autorel;
|
|
heim_auto_release_t autorelpool;
|
|
const char *name;
|
|
void (*dealloc)(void *);
|
|
uintptr_t isaextra[1];
|
|
};
|
|
|
|
#define PTR2BASE(ptr) (((struct heim_base *)ptr) - 1)
|
|
#define BASE2PTR(ptr) ((void *)(((struct heim_base *)ptr) + 1))
|
|
|
|
#ifdef HEIM_BASE_NEED_ATOMIC_MUTEX
|
|
HEIMDAL_MUTEX _heim_base_mutex = HEIMDAL_MUTEX_INITIALIZER;
|
|
#endif
|
|
|
|
/*
|
|
* Auto release structure
|
|
*/
|
|
|
|
struct heim_auto_release {
|
|
HEIM_TAILQ_HEAD(, heim_base) pool;
|
|
HEIMDAL_MUTEX pool_mutex;
|
|
struct heim_auto_release *parent;
|
|
};
|
|
|
|
|
|
/**
|
|
* Retain object
|
|
*
|
|
* @param object to be released, NULL is ok
|
|
*
|
|
* @return the same object as passed in
|
|
*/
|
|
|
|
void *
|
|
heim_retain(void *ptr)
|
|
{
|
|
struct heim_base *p = PTR2BASE(ptr);
|
|
|
|
if (ptr == NULL || heim_base_is_tagged(ptr))
|
|
return ptr;
|
|
|
|
if (p->ref_cnt == heim_base_atomic_max)
|
|
return ptr;
|
|
|
|
if ((heim_base_atomic_inc(&p->ref_cnt) - 1) == 0)
|
|
heim_abort("resurection");
|
|
return ptr;
|
|
}
|
|
|
|
/**
|
|
* Release object, free is reference count reaches zero
|
|
*
|
|
* @param object to be released
|
|
*/
|
|
|
|
void
|
|
heim_release(void *ptr)
|
|
{
|
|
heim_base_atomic_type old;
|
|
struct heim_base *p = PTR2BASE(ptr);
|
|
|
|
if (ptr == NULL || heim_base_is_tagged(ptr))
|
|
return;
|
|
|
|
if (p->ref_cnt == heim_base_atomic_max)
|
|
return;
|
|
|
|
old = heim_base_atomic_dec(&p->ref_cnt) + 1;
|
|
|
|
if (old > 1)
|
|
return;
|
|
|
|
if (old == 1) {
|
|
heim_auto_release_t ar = p->autorelpool;
|
|
/* remove from autorel pool list */
|
|
if (ar) {
|
|
p->autorelpool = NULL;
|
|
HEIMDAL_MUTEX_lock(&ar->pool_mutex);
|
|
HEIM_TAILQ_REMOVE(&ar->pool, p, autorel);
|
|
HEIMDAL_MUTEX_unlock(&ar->pool_mutex);
|
|
}
|
|
if (p->isa->dealloc)
|
|
p->isa->dealloc(ptr);
|
|
free(p);
|
|
} else
|
|
heim_abort("over release");
|
|
}
|
|
|
|
static heim_type_t tagged_isa[9] = {
|
|
&_heim_number_object,
|
|
&_heim_null_object,
|
|
&_heim_bool_object,
|
|
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
heim_type_t
|
|
_heim_get_isa(heim_object_t ptr)
|
|
{
|
|
struct heim_base *p;
|
|
if (heim_base_is_tagged(ptr)) {
|
|
if (heim_base_is_tagged_object(ptr))
|
|
return tagged_isa[heim_base_tagged_object_tid(ptr)];
|
|
heim_abort("not a supported tagged type");
|
|
}
|
|
p = PTR2BASE(ptr);
|
|
return p->isa;
|
|
}
|
|
|
|
/**
|
|
* Get type ID of object
|
|
*
|
|
* @param object object to get type id of
|
|
*
|
|
* @return type id of object
|
|
*/
|
|
|
|
heim_tid_t
|
|
heim_get_tid(heim_object_t ptr)
|
|
{
|
|
heim_type_t isa = _heim_get_isa(ptr);
|
|
return isa->tid;
|
|
}
|
|
|
|
/**
|
|
* Get hash value of object
|
|
*
|
|
* @param object object to get hash value for
|
|
*
|
|
* @return a hash value
|
|
*/
|
|
|
|
unsigned long
|
|
heim_get_hash(heim_object_t ptr)
|
|
{
|
|
heim_type_t isa = _heim_get_isa(ptr);
|
|
if (isa->hash)
|
|
return isa->hash(ptr);
|
|
return (unsigned long)ptr;
|
|
}
|
|
|
|
/**
|
|
* Compare two objects, returns 0 if equal, can use used for qsort()
|
|
* and friends.
|
|
*
|
|
* @param a first object to compare
|
|
* @param b first object to compare
|
|
*
|
|
* @return 0 if objects are equal
|
|
*/
|
|
|
|
int
|
|
heim_cmp(heim_object_t a, heim_object_t b)
|
|
{
|
|
heim_tid_t ta, tb;
|
|
heim_type_t isa;
|
|
|
|
ta = heim_get_tid(a);
|
|
tb = heim_get_tid(b);
|
|
|
|
if (ta != tb)
|
|
return ta - tb;
|
|
|
|
isa = _heim_get_isa(a);
|
|
|
|
if (isa->cmp)
|
|
return isa->cmp(a, b);
|
|
|
|
return (uintptr_t)a - (uintptr_t)b;
|
|
}
|
|
|
|
/*
|
|
* Private - allocates an memory object
|
|
*/
|
|
|
|
static void
|
|
memory_dealloc(void *ptr)
|
|
{
|
|
struct heim_base_mem *p = (struct heim_base_mem *)PTR2BASE(ptr);
|
|
if (p->dealloc)
|
|
p->dealloc(ptr);
|
|
}
|
|
|
|
struct heim_type_data memory_object = {
|
|
HEIM_TID_MEMORY,
|
|
"memory-object",
|
|
NULL,
|
|
memory_dealloc,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
void *
|
|
heim_alloc(size_t size, const char *name, heim_type_dealloc dealloc)
|
|
{
|
|
/* XXX use posix_memalign */
|
|
|
|
struct heim_base_mem *p = calloc(1, size + sizeof(*p));
|
|
if (p == NULL)
|
|
return NULL;
|
|
p->isa = &memory_object;
|
|
p->ref_cnt = 1;
|
|
p->name = name;
|
|
p->dealloc = dealloc;
|
|
return BASE2PTR(p);
|
|
}
|
|
|
|
heim_type_t
|
|
_heim_create_type(const char *name,
|
|
heim_type_init init,
|
|
heim_type_dealloc dealloc,
|
|
heim_type_copy copy,
|
|
heim_type_cmp cmp,
|
|
heim_type_hash hash)
|
|
{
|
|
heim_type_t type;
|
|
|
|
type = calloc(1, sizeof(*type));
|
|
if (type == NULL)
|
|
return NULL;
|
|
|
|
type->tid = heim_base_atomic_inc(&tidglobal);
|
|
type->name = name;
|
|
type->init = init;
|
|
type->dealloc = dealloc;
|
|
type->copy = copy;
|
|
type->cmp = cmp;
|
|
type->hash = hash;
|
|
|
|
return type;
|
|
}
|
|
|
|
heim_object_t
|
|
_heim_alloc_object(heim_type_t type, size_t size)
|
|
{
|
|
/* XXX should use posix_memalign */
|
|
struct heim_base *p = calloc(1, size + sizeof(*p));
|
|
if (p == NULL)
|
|
return NULL;
|
|
p->isa = type;
|
|
p->ref_cnt = 1;
|
|
|
|
return BASE2PTR(p);
|
|
}
|
|
|
|
heim_tid_t
|
|
_heim_type_get_tid(heim_type_t type)
|
|
{
|
|
return type->tid;
|
|
}
|
|
|
|
/**
|
|
* Call func once and only once
|
|
*
|
|
* @param once pointer to a heim_base_once_t
|
|
* @param ctx context passed to func
|
|
* @param func function to be called
|
|
*/
|
|
|
|
void
|
|
heim_base_once_f(heim_base_once_t *once, void *ctx, void (*func)(void *))
|
|
{
|
|
#ifdef HAVE_DISPATCH_DISPATCH_H
|
|
dispatch_once_f(once, ctx, func);
|
|
#else
|
|
static HEIMDAL_MUTEX mutex = HEIMDAL_MUTEX_INITIALIZER;
|
|
HEIMDAL_MUTEX_lock(&mutex);
|
|
if (*once == 0) {
|
|
*once = 1;
|
|
HEIMDAL_MUTEX_unlock(&mutex);
|
|
func(ctx);
|
|
HEIMDAL_MUTEX_lock(&mutex);
|
|
*once = 2;
|
|
HEIMDAL_MUTEX_unlock(&mutex);
|
|
} else if (*once == 2) {
|
|
HEIMDAL_MUTEX_unlock(&mutex);
|
|
} else {
|
|
HEIMDAL_MUTEX_unlock(&mutex);
|
|
while (1) {
|
|
struct timeval tv = { 0, 1000 };
|
|
select(0, NULL, NULL, NULL, &tv);
|
|
HEIMDAL_MUTEX_lock(&mutex);
|
|
if (*once == 2)
|
|
break;
|
|
HEIMDAL_MUTEX_unlock(&mutex);
|
|
}
|
|
HEIMDAL_MUTEX_unlock(&mutex);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Abort and log the failure (using syslog)
|
|
*/
|
|
|
|
void
|
|
heim_abort(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
va_start(ap, fmt);
|
|
heim_abortv(fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
|
|
/**
|
|
* Abort and log the failure (using syslog)
|
|
*/
|
|
|
|
void
|
|
heim_abortv(const char *fmt, va_list ap)
|
|
{
|
|
static char str[1024];
|
|
|
|
vsnprintf(str, sizeof(str), fmt, ap);
|
|
syslog(LOG_ERR, "heim_abort: %s", str);
|
|
abort();
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
static int ar_created = 0;
|
|
static HEIMDAL_thread_key ar_key;
|
|
|
|
struct ar_tls {
|
|
struct heim_auto_release *head;
|
|
struct heim_auto_release *current;
|
|
HEIMDAL_MUTEX tls_mutex;
|
|
};
|
|
|
|
static void
|
|
ar_tls_delete(void *ptr)
|
|
{
|
|
struct ar_tls *tls = ptr;
|
|
if (tls->head)
|
|
heim_release(tls->head);
|
|
free(tls);
|
|
}
|
|
|
|
static void
|
|
init_ar_tls(void *ptr)
|
|
{
|
|
int ret;
|
|
HEIMDAL_key_create(&ar_key, ar_tls_delete, ret);
|
|
if (ret == 0)
|
|
ar_created = 1;
|
|
}
|
|
|
|
static struct ar_tls *
|
|
autorel_tls(void)
|
|
{
|
|
static heim_base_once_t once = HEIM_BASE_ONCE_INIT;
|
|
struct ar_tls *arp;
|
|
int ret;
|
|
|
|
heim_base_once_f(&once, NULL, init_ar_tls);
|
|
if (!ar_created)
|
|
return NULL;
|
|
|
|
arp = HEIMDAL_getspecific(ar_key);
|
|
if (arp == NULL) {
|
|
|
|
arp = calloc(1, sizeof(*arp));
|
|
if (arp == NULL)
|
|
return NULL;
|
|
HEIMDAL_setspecific(ar_key, arp, ret);
|
|
if (ret) {
|
|
free(arp);
|
|
return NULL;
|
|
}
|
|
}
|
|
return arp;
|
|
|
|
}
|
|
|
|
static void
|
|
autorel_dealloc(void *ptr)
|
|
{
|
|
heim_auto_release_t ar = ptr;
|
|
struct ar_tls *tls;
|
|
|
|
tls = autorel_tls();
|
|
if (tls == NULL)
|
|
heim_abort("autorelease pool released on thread w/o autorelease inited");
|
|
|
|
heim_auto_release_drain(ar);
|
|
|
|
if (!HEIM_TAILQ_EMPTY(&ar->pool))
|
|
heim_abort("pool not empty after draining");
|
|
|
|
HEIMDAL_MUTEX_lock(&tls->tls_mutex);
|
|
if (tls->current != ptr)
|
|
heim_abort("autorelease not releaseing top pool");
|
|
|
|
if (tls->current != tls->head)
|
|
tls->current = ar->parent;
|
|
HEIMDAL_MUTEX_unlock(&tls->tls_mutex);
|
|
}
|
|
|
|
static int
|
|
autorel_cmp(void *a, void *b)
|
|
{
|
|
return (a == b);
|
|
}
|
|
|
|
static unsigned long
|
|
autorel_hash(void *ptr)
|
|
{
|
|
return (unsigned long)ptr;
|
|
}
|
|
|
|
|
|
static struct heim_type_data _heim_autorel_object = {
|
|
HEIM_TID_AUTORELEASE,
|
|
"autorelease-pool",
|
|
NULL,
|
|
autorel_dealloc,
|
|
NULL,
|
|
autorel_cmp,
|
|
autorel_hash
|
|
};
|
|
|
|
/**
|
|
*
|
|
*/
|
|
|
|
heim_auto_release_t
|
|
heim_auto_release_create(void)
|
|
{
|
|
struct ar_tls *tls = autorel_tls();
|
|
heim_auto_release_t ar;
|
|
|
|
if (tls == NULL)
|
|
heim_abort("Failed to create/get autorelease head");
|
|
|
|
ar = _heim_alloc_object(&_heim_autorel_object, sizeof(struct heim_auto_release));
|
|
if (ar) {
|
|
HEIMDAL_MUTEX_lock(&tls->tls_mutex);
|
|
if (tls->head == NULL)
|
|
tls->head = ar;
|
|
ar->parent = tls->current;
|
|
tls->current = ar;
|
|
HEIMDAL_MUTEX_unlock(&tls->tls_mutex);
|
|
}
|
|
|
|
return ar;
|
|
}
|
|
|
|
/**
|
|
* Mark the current object as a
|
|
*/
|
|
|
|
void
|
|
heim_auto_release(heim_object_t ptr)
|
|
{
|
|
struct heim_base *p = PTR2BASE(ptr);
|
|
struct ar_tls *tls = autorel_tls();
|
|
heim_auto_release_t ar;
|
|
|
|
if (ptr == NULL || heim_base_is_tagged(ptr))
|
|
return;
|
|
|
|
/* drop from old pool */
|
|
if ((ar = p->autorelpool) != NULL) {
|
|
HEIMDAL_MUTEX_lock(&ar->pool_mutex);
|
|
HEIM_TAILQ_REMOVE(&ar->pool, p, autorel);
|
|
p->autorelpool = NULL;
|
|
HEIMDAL_MUTEX_unlock(&ar->pool_mutex);
|
|
}
|
|
|
|
if (tls == NULL || (ar = tls->current) == NULL)
|
|
heim_abort("no auto relase pool in place, would leak");
|
|
|
|
HEIMDAL_MUTEX_lock(&ar->pool_mutex);
|
|
HEIM_TAILQ_INSERT_HEAD(&ar->pool, p, autorel);
|
|
p->autorelpool = ar;
|
|
HEIMDAL_MUTEX_unlock(&ar->pool_mutex);
|
|
}
|
|
|
|
/**
|
|
*
|
|
*/
|
|
|
|
void
|
|
heim_auto_release_drain(heim_auto_release_t autorel)
|
|
{
|
|
heim_object_t obj;
|
|
|
|
/* release all elements on the tail queue */
|
|
|
|
HEIMDAL_MUTEX_lock(&autorel->pool_mutex);
|
|
while(!HEIM_TAILQ_EMPTY(&autorel->pool)) {
|
|
obj = HEIM_TAILQ_FIRST(&autorel->pool);
|
|
HEIMDAL_MUTEX_unlock(&autorel->pool_mutex);
|
|
heim_release(BASE2PTR(obj));
|
|
HEIMDAL_MUTEX_lock(&autorel->pool_mutex);
|
|
}
|
|
HEIMDAL_MUTEX_unlock(&autorel->pool_mutex);
|
|
}
|