84d55c7fad
path, making them suitable for direct use by the dynamic loader. Register libpthread-specific locking API with rtld on startup. This still has some rough edges with signals which should be addresses later. Approved by: re (scottl)
531 lines
16 KiB
C
531 lines
16 KiB
C
/*
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* Copyright (c) 2003 Daniel M. Eischen <deischen@freebsd.org>
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* Copyright (c) 1995-1998 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. 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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* $FreeBSD$
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*/
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/* Allocate space for global thread variables here: */
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#define GLOBAL_PTHREAD_PRIVATE
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/types.h>
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#include <machine/reg.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include <sys/event.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/ttycom.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <pthread.h>
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#include <pthread_np.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.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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#include "ksd.h"
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int __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
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int __pthread_mutex_lock(pthread_mutex_t *);
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int __pthread_mutex_trylock(pthread_mutex_t *);
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void _thread_init_hack(void);
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static void init_private(void);
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static void init_main_thread(struct pthread *thread);
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/*
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* All weak references used within libc should be in this table.
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* This is so that static libraries will work.
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*/
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static void *references[] = {
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&_accept,
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&_bind,
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&_close,
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&_connect,
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&_dup,
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&_dup2,
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&_execve,
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&_fcntl,
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&_flock,
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&_flockfile,
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&_fstat,
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&_fstatfs,
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&_fsync,
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&_funlockfile,
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&_getdirentries,
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&_getlogin,
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|
&_getpeername,
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|
&_getsockname,
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&_getsockopt,
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&_ioctl,
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&_kevent,
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&_listen,
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&_nanosleep,
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&_open,
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&_pthread_getspecific,
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&_pthread_key_create,
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&_pthread_key_delete,
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&_pthread_mutex_destroy,
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&_pthread_mutex_init,
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&_pthread_mutex_lock,
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&_pthread_mutex_trylock,
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&_pthread_mutex_unlock,
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&_pthread_mutexattr_init,
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&_pthread_mutexattr_destroy,
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&_pthread_mutexattr_settype,
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&_pthread_once,
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&_pthread_setspecific,
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&_read,
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&_readv,
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&_recvfrom,
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&_recvmsg,
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&_select,
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&_sendmsg,
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&_sendto,
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&_setsockopt,
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&_sigaction,
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&_sigprocmask,
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&_sigsuspend,
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&_socket,
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&_socketpair,
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&_thread_init_hack,
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&_wait4,
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&_write,
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&_writev
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};
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/*
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* These are needed when linking statically. All references within
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* libgcc (and in the future libc) to these routines are weak, but
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* if they are not (strongly) referenced by the application or other
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* libraries, then the actual functions will not be loaded.
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*/
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static void *libgcc_references[] = {
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&_pthread_once,
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&_pthread_key_create,
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&_pthread_key_delete,
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&_pthread_getspecific,
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&_pthread_setspecific,
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&_pthread_mutex_init,
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&_pthread_mutex_destroy,
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&_pthread_mutex_lock,
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&_pthread_mutex_trylock,
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&_pthread_mutex_unlock
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};
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#define DUAL_ENTRY(entry) \
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(pthread_func_t)entry, (pthread_func_t)entry
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static pthread_func_t jmp_table[][2] = {
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{DUAL_ENTRY(_pthread_cond_broadcast)}, /* PJT_COND_BROADCAST */
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{DUAL_ENTRY(_pthread_cond_destroy)}, /* PJT_COND_DESTROY */
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{DUAL_ENTRY(_pthread_cond_init)}, /* PJT_COND_INIT */
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{DUAL_ENTRY(_pthread_cond_signal)}, /* PJT_COND_SIGNAL */
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{(pthread_func_t)__pthread_cond_wait,
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(pthread_func_t)_pthread_cond_wait}, /* PJT_COND_WAIT */
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{DUAL_ENTRY(_pthread_getspecific)}, /* PJT_GETSPECIFIC */
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{DUAL_ENTRY(_pthread_key_create)}, /* PJT_KEY_CREATE */
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{DUAL_ENTRY(_pthread_key_delete)}, /* PJT_KEY_DELETE*/
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{DUAL_ENTRY(_pthread_main_np)}, /* PJT_MAIN_NP */
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{DUAL_ENTRY(_pthread_mutex_destroy)}, /* PJT_MUTEX_DESTROY */
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{DUAL_ENTRY(_pthread_mutex_init)}, /* PJT_MUTEX_INIT */
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{(pthread_func_t)__pthread_mutex_lock,
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(pthread_func_t)_pthread_mutex_lock}, /* PJT_MUTEX_LOCK */
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{(pthread_func_t)__pthread_mutex_trylock,
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(pthread_func_t)_pthread_mutex_trylock},/* PJT_MUTEX_TRYLOCK */
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{DUAL_ENTRY(_pthread_mutex_unlock)}, /* PJT_MUTEX_UNLOCK */
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{DUAL_ENTRY(_pthread_mutexattr_destroy)}, /* PJT_MUTEXATTR_DESTROY */
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{DUAL_ENTRY(_pthread_mutexattr_init)}, /* PJT_MUTEXATTR_INIT */
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{DUAL_ENTRY(_pthread_mutexattr_settype)}, /* PJT_MUTEXATTR_SETTYPE */
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{DUAL_ENTRY(_pthread_once)}, /* PJT_ONCE */
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{DUAL_ENTRY(_pthread_rwlock_destroy)}, /* PJT_RWLOCK_DESTROY */
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{DUAL_ENTRY(_pthread_rwlock_init)}, /* PJT_RWLOCK_INIT */
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{DUAL_ENTRY(_pthread_rwlock_rdlock)}, /* PJT_RWLOCK_RDLOCK */
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{DUAL_ENTRY(_pthread_rwlock_tryrdlock)},/* PJT_RWLOCK_TRYRDLOCK */
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{DUAL_ENTRY(_pthread_rwlock_trywrlock)},/* PJT_RWLOCK_TRYWRLOCK */
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{DUAL_ENTRY(_pthread_rwlock_unlock)}, /* PJT_RWLOCK_UNLOCK */
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{DUAL_ENTRY(_pthread_rwlock_wrlock)}, /* PJT_RWLOCK_WRLOCK */
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{DUAL_ENTRY(_pthread_self)}, /* PJT_SELF */
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{DUAL_ENTRY(_pthread_setspecific)}, /* PJT_SETSPECIFIC */
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{DUAL_ENTRY(_pthread_sigmask)} /* PJT_SIGMASK */
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};
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static int init_once = 0;
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/*
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* Threaded process initialization.
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*
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* This is only called under two conditions:
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*
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* 1) Some thread routines have detected that the library hasn't yet
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* been initialized (_thr_initial == NULL && curthread == NULL), or
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*
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* 2) An explicit call to reinitialize after a fork (indicated
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* by curthread != NULL)
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*/
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void
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_libpthread_init(struct pthread *curthread)
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{
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int fd;
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/* Check if this function has already been called: */
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if ((_thr_initial != NULL) && (curthread == NULL))
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/* Only initialize the threaded application once. */
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return;
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/*
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* Make gcc quiescent about {,libgcc_}references not being
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* referenced:
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*/
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if ((references[0] == NULL) || (libgcc_references[0] == NULL))
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PANIC("Failed loading mandatory references in _thread_init");
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/*
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* Check the size of the jump table to make sure it is preset
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* with the correct number of entries.
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*/
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if (sizeof(jmp_table) != (sizeof(pthread_func_t) * PJT_MAX * 2))
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PANIC("Thread jump table not properly initialized");
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memcpy(__thr_jtable, jmp_table, sizeof(jmp_table));
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/*
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* Check for the special case of this process running as
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* or in place of init as pid = 1:
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*/
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if ((_thr_pid = getpid()) == 1) {
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/*
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* Setup a new session for this process which is
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* assumed to be running as root.
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*/
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if (setsid() == -1)
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PANIC("Can't set session ID");
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if (revoke(_PATH_CONSOLE) != 0)
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PANIC("Can't revoke console");
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if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
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PANIC("Can't open console");
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if (setlogin("root") == -1)
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PANIC("Can't set login to root");
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if (__sys_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1)
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PANIC("Can't set controlling terminal");
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}
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/* Initialize pthread private data. */
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init_private();
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_kse_init();
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/* Initialize the initial kse and kseg. */
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_kse_initial = _kse_alloc(NULL);
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if (_kse_initial == NULL)
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PANIC("Can't allocate initial kse.");
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_kse_initial->k_kseg = _kseg_alloc(NULL);
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if (_kse_initial->k_kseg == NULL)
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PANIC("Can't allocate initial kseg.");
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_kse_initial->k_schedq = &_kse_initial->k_kseg->kg_schedq;
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TAILQ_INSERT_TAIL(&_kse_initial->k_kseg->kg_kseq, _kse_initial, k_kgqe);
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_kse_initial->k_kseg->kg_ksecount = 1;
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/* Set the initial thread. */
|
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if (curthread == NULL) {
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/* Create and initialize the initial thread. */
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curthread = _thr_alloc(NULL);
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if (curthread == NULL)
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PANIC("Can't allocate initial thread");
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_thr_initial = curthread;
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init_main_thread(curthread);
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} else {
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/*
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* The initial thread is the current thread. It is
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* assumed that the current thread is already initialized
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* because it is left over from a fork().
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|
*/
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|
_thr_initial = curthread;
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|
}
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_kse_initial->k_kseg->kg_threadcount = 0;
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_thr_initial->kse = _kse_initial;
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_thr_initial->kseg = _kse_initial->k_kseg;
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_thr_initial->active = 1;
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|
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/*
|
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* Add the thread to the thread list and to the KSEG's thread
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* queue.
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|
*/
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THR_LIST_ADD(_thr_initial);
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KSEG_THRQ_ADD(_kse_initial->k_kseg, _thr_initial);
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|
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/* Setup the KSE/thread specific data for the current KSE/thread. */
|
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if (_ksd_setprivate(&_thr_initial->kse->k_ksd) != 0)
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PANIC("Can't set initial KSE specific data");
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_set_curkse(_thr_initial->kse);
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_thr_initial->kse->k_curthread = _thr_initial;
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|
_thr_initial->kse->k_flags |= KF_INITIALIZED;
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_kse_initial->k_curthread = _thr_initial;
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|
|
_thr_rtld_init();
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}
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|
|
/*
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* This function and pthread_create() do a lot of the same things.
|
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* It'd be nice to consolidate the common stuff in one place.
|
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*/
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static void
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init_main_thread(struct pthread *thread)
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{
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void *p;
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int i;
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|
|
/* Zero the initial thread structure. */
|
|
p = thread->alloc_addr;
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memset(thread, 0, sizeof(struct pthread));
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thread->alloc_addr = p;
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|
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/* Setup the thread attributes. */
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thread->attr = _pthread_attr_default;
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|
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/*
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* Set up the thread stack.
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|
*
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* Create a red zone below the main stack. All other stacks
|
|
* are constrained to a maximum size by the parameters
|
|
* passed to mmap(), but this stack is only limited by
|
|
* resource limits, so this stack needs an explicitly mapped
|
|
* red zone to protect the thread stack that is just beyond.
|
|
*/
|
|
if (mmap((void *)_usrstack - THR_STACK_INITIAL -
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_thr_guard_default, _thr_guard_default, 0, MAP_ANON,
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-1, 0) == MAP_FAILED)
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PANIC("Cannot allocate red zone for initial thread");
|
|
|
|
/*
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* Mark the stack as an application supplied stack so that it
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* isn't deallocated.
|
|
*
|
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* XXX - I'm not sure it would hurt anything to deallocate
|
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* the main thread stack because deallocation doesn't
|
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* actually free() it; it just puts it in the free
|
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* stack queue for later reuse.
|
|
*/
|
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thread->attr.stackaddr_attr = (void *)_usrstack - THR_STACK_INITIAL;
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|
thread->attr.stacksize_attr = THR_STACK_INITIAL;
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thread->attr.guardsize_attr = _thr_guard_default;
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|
thread->attr.flags |= THR_STACK_USER;
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|
|
|
/*
|
|
* Write a magic value to the thread structure
|
|
* to help identify valid ones:
|
|
*/
|
|
thread->magic = THR_MAGIC;
|
|
|
|
thread->slice_usec = -1;
|
|
thread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED;
|
|
thread->name = strdup("initial thread");
|
|
|
|
/* Initialize the thread for signals: */
|
|
sigemptyset(&thread->sigmask);
|
|
|
|
/*
|
|
* Set up the thread mailbox. The threads saved context
|
|
* is also in the mailbox.
|
|
*/
|
|
thread->tmbx.tm_udata = thread;
|
|
thread->tmbx.tm_context.uc_sigmask = thread->sigmask;
|
|
thread->tmbx.tm_context.uc_stack.ss_size = thread->attr.stacksize_attr;
|
|
thread->tmbx.tm_context.uc_stack.ss_sp = thread->attr.stackaddr_attr;
|
|
|
|
/* Default the priority of the initial thread: */
|
|
thread->base_priority = THR_DEFAULT_PRIORITY;
|
|
thread->active_priority = THR_DEFAULT_PRIORITY;
|
|
thread->inherited_priority = 0;
|
|
|
|
/* Initialize the mutex queue: */
|
|
TAILQ_INIT(&thread->mutexq);
|
|
|
|
/* Initialize thread locking. */
|
|
if (_lock_init(&thread->lock, LCK_ADAPTIVE,
|
|
_thr_lock_wait, _thr_lock_wakeup) != 0)
|
|
PANIC("Cannot initialize initial thread lock");
|
|
for (i = 0; i < MAX_THR_LOCKLEVEL; i++) {
|
|
_lockuser_init(&thread->lockusers[i], (void *)thread);
|
|
_LCK_SET_PRIVATE2(&thread->lockusers[i], (void *)thread);
|
|
}
|
|
|
|
/* Initialize hooks in the thread structure: */
|
|
thread->specific = NULL;
|
|
thread->cleanup = NULL;
|
|
thread->flags = 0;
|
|
thread->continuation = NULL;
|
|
|
|
thread->state = PS_RUNNING;
|
|
thread->uniqueid = 0;
|
|
}
|
|
|
|
static void
|
|
init_private(void)
|
|
{
|
|
struct clockinfo clockinfo;
|
|
struct sigaction act;
|
|
size_t len;
|
|
int mib[2];
|
|
int i;
|
|
|
|
/*
|
|
* Avoid reinitializing some things if they don't need to be,
|
|
* e.g. after a fork().
|
|
*/
|
|
if (init_once == 0) {
|
|
/* Find the stack top */
|
|
mib[0] = CTL_KERN;
|
|
mib[1] = KERN_USRSTACK;
|
|
len = sizeof (_usrstack);
|
|
if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1)
|
|
PANIC("Cannot get kern.usrstack from sysctl");
|
|
|
|
/*
|
|
* Create a red zone below the main stack. All other
|
|
* stacks are constrained to a maximum size by the
|
|
* parameters passed to mmap(), but this stack is only
|
|
* limited by resource limits, so this stack needs an
|
|
* explicitly mapped red zone to protect the thread stack
|
|
* that is just beyond.
|
|
*/
|
|
if (mmap((void *)_usrstack - THR_STACK_INITIAL -
|
|
_thr_guard_default, _thr_guard_default,
|
|
0, MAP_ANON, -1, 0) == MAP_FAILED)
|
|
PANIC("Cannot allocate red zone for initial thread");
|
|
|
|
/* Get the kernel clockrate: */
|
|
mib[0] = CTL_KERN;
|
|
mib[1] = KERN_CLOCKRATE;
|
|
len = sizeof (struct clockinfo);
|
|
if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0)
|
|
_clock_res_usec = clockinfo.tick;
|
|
else
|
|
_clock_res_usec = CLOCK_RES_USEC;
|
|
|
|
_thr_page_size = getpagesize();
|
|
_thr_guard_default = _thr_page_size;
|
|
|
|
init_once = 1; /* Don't do this again. */
|
|
} else {
|
|
/*
|
|
* Destroy the locks before creating them. We don't
|
|
* know what state they are in so it is better to just
|
|
* recreate them.
|
|
*/
|
|
_lock_destroy(&_thread_signal_lock);
|
|
_lock_destroy(&_mutex_static_lock);
|
|
_lock_destroy(&_rwlock_static_lock);
|
|
_lock_destroy(&_keytable_lock);
|
|
}
|
|
|
|
|
|
/* Initialize everything else. */
|
|
TAILQ_INIT(&_thread_list);
|
|
TAILQ_INIT(&_thread_gc_list);
|
|
|
|
/* Enter a loop to get the existing signal status: */
|
|
for (i = 1; i < NSIG; i++) {
|
|
/* Check for signals which cannot be trapped: */
|
|
if (i == SIGKILL || i == SIGSTOP) {
|
|
}
|
|
|
|
/* Get the signal handler details: */
|
|
else if (__sys_sigaction(i, NULL,
|
|
&_thread_sigact[i - 1]) != 0) {
|
|
/*
|
|
* Abort this process if signal
|
|
* initialisation fails:
|
|
*/
|
|
PANIC("Cannot read signal handler info");
|
|
}
|
|
|
|
/* Initialize the SIG_DFL dummy handler count. */
|
|
_thread_dfl_count[i] = 0;
|
|
}
|
|
|
|
/*
|
|
* Install the signal handler for SIGINFO. It isn't
|
|
* really needed, but it is nice to have for debugging
|
|
* purposes.
|
|
*/
|
|
if (__sys_sigaction(SIGINFO, &act, NULL) != 0) {
|
|
/*
|
|
* Abort this process if signal initialisation fails:
|
|
*/
|
|
PANIC("Cannot initialize signal handler");
|
|
}
|
|
_thread_sigact[SIGINFO - 1].sa_flags = SA_SIGINFO | SA_RESTART;
|
|
|
|
/*
|
|
* Initialize the lock for temporary installation of signal
|
|
* handlers (to support sigwait() semantics) and for the
|
|
* process signal mask and pending signal sets.
|
|
*/
|
|
if (_lock_init(&_thread_signal_lock, LCK_ADAPTIVE,
|
|
_kse_lock_wait, _kse_lock_wakeup) != 0)
|
|
PANIC("Cannot initialize _thread_signal_lock");
|
|
if (_lock_init(&_mutex_static_lock, LCK_ADAPTIVE,
|
|
_thr_lock_wait, _thr_lock_wakeup) != 0)
|
|
PANIC("Cannot initialize mutex static init lock");
|
|
if (_lock_init(&_rwlock_static_lock, LCK_ADAPTIVE,
|
|
_thr_lock_wait, _thr_lock_wakeup) != 0)
|
|
PANIC("Cannot initialize rwlock static init lock");
|
|
if (_lock_init(&_keytable_lock, LCK_ADAPTIVE,
|
|
_thr_lock_wait, _thr_lock_wakeup) != 0)
|
|
PANIC("Cannot initialize thread specific keytable lock");
|
|
_thr_spinlock_init();
|
|
|
|
/* Clear pending signals and get the process signal mask. */
|
|
sigemptyset(&_thr_proc_sigpending);
|
|
__sys_sigprocmask(SIG_SETMASK, NULL, &_thr_proc_sigmask);
|
|
|
|
/*
|
|
* _thread_list_lock and _kse_count are initialized
|
|
* by _kse_init()
|
|
*/
|
|
}
|