glibc/htl/forward.c

284 lines
7.8 KiB
C
Raw Normal View History

/* Libc stubs for pthread functions. Hurd pthread version.
Copyright (C) 2002-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <shlib-compat.h>
#include <pthread-functions.h>
#include <libc-lock.h>
#include <fork.h>
/* Pointers to the libc functions. */
struct pthread_functions __libc_pthread_functions attribute_hidden;
int __libc_pthread_functions_init attribute_hidden;
#define FORWARD2(name, rettype, decl, params, defaction) \
rettype \
name decl \
{ \
if (!__libc_pthread_functions_init) \
defaction; \
\
return PTHFCT_CALL (ptr_##name, params); \
}
/* Same as FORWARD2, only without return. */
#define FORWARD_NORETURN(name, rettype, decl, params, defaction) \
rettype \
name decl \
{ \
if (!__libc_pthread_functions_init) \
defaction; \
\
PTHFCT_CALL (ptr_##name, params); \
}
#define FORWARD(name, decl, params, defretval) \
FORWARD2 (name, int, decl, params, return defretval)
FORWARD (pthread_attr_destroy, (pthread_attr_t *attr), (attr), 0)
FORWARD (pthread_attr_init, (pthread_attr_t *attr), (attr), 0)
FORWARD (pthread_attr_getdetachstate,
(const pthread_attr_t *attr, int *detachstate), (attr, detachstate),
0)
FORWARD (pthread_attr_setdetachstate, (pthread_attr_t *attr, int detachstate),
(attr, detachstate), 0)
FORWARD (pthread_attr_getinheritsched,
(const pthread_attr_t *attr, int *inherit), (attr, inherit), 0)
FORWARD (pthread_attr_setinheritsched, (pthread_attr_t *attr, int inherit),
(attr, inherit), 0)
FORWARD (pthread_attr_getschedparam,
(const pthread_attr_t *attr, struct sched_param *param),
(attr, param), 0)
FORWARD (pthread_attr_setschedparam,
(pthread_attr_t *attr, const struct sched_param *param),
(attr, param), 0)
FORWARD (pthread_attr_getschedpolicy,
(const pthread_attr_t *attr, int *policy), (attr, policy), 0)
FORWARD (pthread_attr_setschedpolicy, (pthread_attr_t *attr, int policy),
(attr, policy), 0)
FORWARD (pthread_attr_getscope,
(const pthread_attr_t *attr, int *scope), (attr, scope), 0)
FORWARD (pthread_attr_setscope, (pthread_attr_t *attr, int scope),
(attr, scope), 0)
FORWARD (pthread_condattr_destroy, (pthread_condattr_t *attr), (attr), 0)
FORWARD (pthread_condattr_init, (pthread_condattr_t *attr), (attr), 0)
FORWARD (pthread_cond_broadcast, (pthread_cond_t *cond), (cond), 0)
FORWARD (pthread_cond_destroy, (pthread_cond_t *cond), (cond), 0)
FORWARD (pthread_cond_init,
(pthread_cond_t *cond, const pthread_condattr_t *cond_attr),
(cond, cond_attr), 0)
FORWARD (pthread_cond_signal, (pthread_cond_t *cond), (cond), 0)
FORWARD (pthread_cond_wait, (pthread_cond_t *cond, pthread_mutex_t *mutex),
(cond, mutex), 0)
FORWARD (pthread_cond_timedwait,
(pthread_cond_t *cond, pthread_mutex_t *mutex,
const struct timespec *abstime), (cond, mutex, abstime), 0)
FORWARD (pthread_equal, (pthread_t thread1, pthread_t thread2),
(thread1, thread2), 1)
/* Use an alias to avoid warning, as pthread_exit is declared noreturn. */
FORWARD_NORETURN (__pthread_exit, void, (void *retval), (retval),
exit (EXIT_SUCCESS))
strong_alias (__pthread_exit, pthread_exit);
FORWARD (pthread_getschedparam,
(pthread_t target_thread, int *policy, struct sched_param *param),
(target_thread, policy, param), 0)
FORWARD (pthread_setschedparam,
(pthread_t target_thread, int policy,
const struct sched_param *param), (target_thread, policy, param), 0)
FORWARD (pthread_mutex_destroy, (pthread_mutex_t *mutex), (mutex), 0)
FORWARD (pthread_mutex_init,
(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr),
(mutex, mutexattr), 0)
FORWARD (pthread_mutex_lock, (pthread_mutex_t *mutex), (mutex), 0)
FORWARD (pthread_mutex_unlock, (pthread_mutex_t *mutex), (mutex), 0)
FORWARD2 (pthread_self, pthread_t, (void), (), return 0)
FORWARD (__pthread_setcancelstate, (int state, int *oldstate),
(state, oldstate), 0)
strong_alias (__pthread_setcancelstate, pthread_setcancelstate);
FORWARD (pthread_setcanceltype, (int type, int *oldtype), (type, oldtype), 0)
struct __pthread_cancelation_handler *dummy_list;
FORWARD2 (__pthread_get_cleanup_stack, struct __pthread_cancelation_handler **,
(void), (), return &dummy_list);
/* Fork interaction */
struct atfork
{
void (*prepare) (void);
void (*parent) (void);
void (*child) (void);
void *dso_handle;
struct atfork *prev;
struct atfork *next;
};
/* TODO: better locking */
__libc_lock_define_initialized (static, atfork_lock);
static struct atfork *fork_handlers, *fork_last_handler;
static void
atfork_pthread_prepare (void)
{
struct atfork *handlers, *last_handler;
__libc_lock_lock (atfork_lock);
handlers = fork_handlers;
last_handler = fork_last_handler;
__libc_lock_unlock (atfork_lock);
if (last_handler == NULL)
return;
while (1)
{
if (last_handler->prepare != NULL)
last_handler->prepare ();
if (last_handler == handlers)
break;
last_handler = last_handler->prev;
}
}
text_set_element (_hurd_atfork_prepare_hook, atfork_pthread_prepare);
static void
atfork_pthread_parent (void)
{
struct atfork *handlers;
__libc_lock_lock (atfork_lock);
handlers = fork_handlers;
__libc_lock_unlock (atfork_lock);
while (handlers != NULL)
{
if (handlers->parent != NULL)
handlers->parent ();
handlers = handlers->next;
}
}
text_set_element (_hurd_atfork_parent_hook, atfork_pthread_parent);
static void
atfork_pthread_child (void)
{
struct atfork *handlers;
__libc_lock_lock (atfork_lock);
handlers = fork_handlers;
__libc_lock_unlock (atfork_lock);
while (handlers != NULL)
{
if (handlers->child != NULL)
handlers->child ();
handlers = handlers->next;
}
}
text_set_element (_hurd_atfork_child_hook, atfork_pthread_child);
int
__register_atfork (void (*prepare) (void),
void (*parent) (void),
void (*child) (void),
void *dso_handle)
{
struct atfork *new = malloc (sizeof (*new));
if (new == NULL)
return errno;
new->prepare = prepare;
new->parent = parent;
new->child = child;
new->dso_handle = dso_handle;
new->prev = NULL;
__libc_lock_lock (atfork_lock);
new->next = fork_handlers;
if (fork_handlers != NULL)
fork_handlers->prev = new;
fork_handlers = new;
if (fork_last_handler == NULL)
fork_last_handler = new;
__libc_lock_unlock (atfork_lock);
return 0;
}
libc_hidden_def (__register_atfork)
void
__unregister_atfork (void *dso_handle)
{
struct atfork **handlers, *prev = NULL, *next;
__libc_lock_lock (atfork_lock);
handlers = &fork_handlers;
while (*handlers != NULL)
{
if ((*handlers)->dso_handle == dso_handle)
{
/* Drop this handler from the list. */
if (*handlers == fork_last_handler)
{
/* Was last, new last is prev, if any. */
fork_last_handler = prev;
}
next = (*handlers)->next;
if (next != NULL)
next->prev = prev;
*handlers = next;
}
else
{
/* Just proceed to next handler. */
prev = *handlers;
handlers = &prev->next;
}
}
__libc_lock_unlock (atfork_lock);
}