284 lines
7.8 KiB
C
284 lines
7.8 KiB
C
/* Libc stubs for pthread functions. Hurd pthread version.
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Copyright (C) 2002-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <dlfcn.h>
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#include <stdlib.h>
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#include <shlib-compat.h>
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#include <pthread-functions.h>
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#include <libc-lock.h>
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#include <fork.h>
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/* Pointers to the libc functions. */
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struct pthread_functions __libc_pthread_functions attribute_hidden;
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int __libc_pthread_functions_init attribute_hidden;
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#define FORWARD2(name, rettype, decl, params, defaction) \
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rettype \
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name decl \
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{ \
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if (!__libc_pthread_functions_init) \
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defaction; \
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\
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return PTHFCT_CALL (ptr_##name, params); \
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}
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/* Same as FORWARD2, only without return. */
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#define FORWARD_NORETURN(name, rettype, decl, params, defaction) \
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rettype \
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name decl \
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{ \
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if (!__libc_pthread_functions_init) \
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defaction; \
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\
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PTHFCT_CALL (ptr_##name, params); \
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}
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#define FORWARD(name, decl, params, defretval) \
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FORWARD2 (name, int, decl, params, return defretval)
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FORWARD (pthread_attr_destroy, (pthread_attr_t *attr), (attr), 0)
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FORWARD (pthread_attr_init, (pthread_attr_t *attr), (attr), 0)
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FORWARD (pthread_attr_getdetachstate,
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(const pthread_attr_t *attr, int *detachstate), (attr, detachstate),
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0)
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FORWARD (pthread_attr_setdetachstate, (pthread_attr_t *attr, int detachstate),
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(attr, detachstate), 0)
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FORWARD (pthread_attr_getinheritsched,
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(const pthread_attr_t *attr, int *inherit), (attr, inherit), 0)
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FORWARD (pthread_attr_setinheritsched, (pthread_attr_t *attr, int inherit),
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(attr, inherit), 0)
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FORWARD (pthread_attr_getschedparam,
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(const pthread_attr_t *attr, struct sched_param *param),
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(attr, param), 0)
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FORWARD (pthread_attr_setschedparam,
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(pthread_attr_t *attr, const struct sched_param *param),
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(attr, param), 0)
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FORWARD (pthread_attr_getschedpolicy,
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(const pthread_attr_t *attr, int *policy), (attr, policy), 0)
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FORWARD (pthread_attr_setschedpolicy, (pthread_attr_t *attr, int policy),
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(attr, policy), 0)
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FORWARD (pthread_attr_getscope,
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(const pthread_attr_t *attr, int *scope), (attr, scope), 0)
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FORWARD (pthread_attr_setscope, (pthread_attr_t *attr, int scope),
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(attr, scope), 0)
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FORWARD (pthread_condattr_destroy, (pthread_condattr_t *attr), (attr), 0)
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FORWARD (pthread_condattr_init, (pthread_condattr_t *attr), (attr), 0)
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FORWARD (pthread_cond_broadcast, (pthread_cond_t *cond), (cond), 0)
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FORWARD (pthread_cond_destroy, (pthread_cond_t *cond), (cond), 0)
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FORWARD (pthread_cond_init,
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(pthread_cond_t *cond, const pthread_condattr_t *cond_attr),
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(cond, cond_attr), 0)
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FORWARD (pthread_cond_signal, (pthread_cond_t *cond), (cond), 0)
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FORWARD (pthread_cond_wait, (pthread_cond_t *cond, pthread_mutex_t *mutex),
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(cond, mutex), 0)
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FORWARD (pthread_cond_timedwait,
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(pthread_cond_t *cond, pthread_mutex_t *mutex,
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const struct timespec *abstime), (cond, mutex, abstime), 0)
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FORWARD (pthread_equal, (pthread_t thread1, pthread_t thread2),
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(thread1, thread2), 1)
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/* Use an alias to avoid warning, as pthread_exit is declared noreturn. */
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FORWARD_NORETURN (__pthread_exit, void, (void *retval), (retval),
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exit (EXIT_SUCCESS))
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strong_alias (__pthread_exit, pthread_exit);
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FORWARD (pthread_getschedparam,
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(pthread_t target_thread, int *policy, struct sched_param *param),
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(target_thread, policy, param), 0)
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FORWARD (pthread_setschedparam,
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(pthread_t target_thread, int policy,
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const struct sched_param *param), (target_thread, policy, param), 0)
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FORWARD (pthread_mutex_destroy, (pthread_mutex_t *mutex), (mutex), 0)
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FORWARD (pthread_mutex_init,
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(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr),
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(mutex, mutexattr), 0)
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FORWARD (pthread_mutex_lock, (pthread_mutex_t *mutex), (mutex), 0)
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FORWARD (pthread_mutex_unlock, (pthread_mutex_t *mutex), (mutex), 0)
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FORWARD2 (pthread_self, pthread_t, (void), (), return 0)
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FORWARD (__pthread_setcancelstate, (int state, int *oldstate),
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(state, oldstate), 0)
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strong_alias (__pthread_setcancelstate, pthread_setcancelstate);
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FORWARD (pthread_setcanceltype, (int type, int *oldtype), (type, oldtype), 0)
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struct __pthread_cancelation_handler *dummy_list;
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FORWARD2 (__pthread_get_cleanup_stack, struct __pthread_cancelation_handler **,
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(void), (), return &dummy_list);
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/* Fork interaction */
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struct atfork
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{
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void (*prepare) (void);
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void (*parent) (void);
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void (*child) (void);
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void *dso_handle;
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struct atfork *prev;
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struct atfork *next;
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};
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/* TODO: better locking */
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__libc_lock_define_initialized (static, atfork_lock);
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static struct atfork *fork_handlers, *fork_last_handler;
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static void
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atfork_pthread_prepare (void)
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{
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struct atfork *handlers, *last_handler;
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__libc_lock_lock (atfork_lock);
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handlers = fork_handlers;
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last_handler = fork_last_handler;
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__libc_lock_unlock (atfork_lock);
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if (last_handler == NULL)
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return;
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while (1)
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{
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if (last_handler->prepare != NULL)
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last_handler->prepare ();
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if (last_handler == handlers)
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break;
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last_handler = last_handler->prev;
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}
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}
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text_set_element (_hurd_atfork_prepare_hook, atfork_pthread_prepare);
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static void
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atfork_pthread_parent (void)
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{
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struct atfork *handlers;
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__libc_lock_lock (atfork_lock);
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handlers = fork_handlers;
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__libc_lock_unlock (atfork_lock);
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while (handlers != NULL)
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{
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if (handlers->parent != NULL)
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handlers->parent ();
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handlers = handlers->next;
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}
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}
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text_set_element (_hurd_atfork_parent_hook, atfork_pthread_parent);
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static void
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atfork_pthread_child (void)
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{
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struct atfork *handlers;
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__libc_lock_lock (atfork_lock);
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handlers = fork_handlers;
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__libc_lock_unlock (atfork_lock);
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while (handlers != NULL)
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{
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if (handlers->child != NULL)
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handlers->child ();
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handlers = handlers->next;
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}
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}
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text_set_element (_hurd_atfork_child_hook, atfork_pthread_child);
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int
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__register_atfork (void (*prepare) (void),
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void (*parent) (void),
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void (*child) (void),
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void *dso_handle)
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{
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struct atfork *new = malloc (sizeof (*new));
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if (new == NULL)
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return errno;
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new->prepare = prepare;
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new->parent = parent;
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new->child = child;
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new->dso_handle = dso_handle;
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new->prev = NULL;
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__libc_lock_lock (atfork_lock);
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new->next = fork_handlers;
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if (fork_handlers != NULL)
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fork_handlers->prev = new;
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fork_handlers = new;
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if (fork_last_handler == NULL)
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fork_last_handler = new;
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__libc_lock_unlock (atfork_lock);
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return 0;
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}
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libc_hidden_def (__register_atfork)
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void
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__unregister_atfork (void *dso_handle)
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{
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struct atfork **handlers, *prev = NULL, *next;
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__libc_lock_lock (atfork_lock);
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handlers = &fork_handlers;
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while (*handlers != NULL)
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{
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if ((*handlers)->dso_handle == dso_handle)
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{
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/* Drop this handler from the list. */
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if (*handlers == fork_last_handler)
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{
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/* Was last, new last is prev, if any. */
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fork_last_handler = prev;
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}
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next = (*handlers)->next;
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if (next != NULL)
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next->prev = prev;
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*handlers = next;
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}
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else
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{
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/* Just proceed to next handler. */
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prev = *handlers;
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handlers = &prev->next;
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}
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}
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__libc_lock_unlock (atfork_lock);
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}
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