f066519e91
1. fast simple type mutex.
2. __thread tls works.
3. asynchronous cancellation works ( using signal ).
4. thread synchronization is fully based on umtx, mainly, condition
variable and other synchronization objects were rewritten by using
umtx directly. those objects can be shared between processes via
shared memory, it has to change ABI which does not happen yet.
5. default stack size is increased to 1M on 32 bits platform, 2M for
64 bits platform.
As the result, some mysql super-smack benchmarks show performance is
improved massivly.
Okayed by: jeff, mtm, rwatson, scottl
419 lines
12 KiB
C
419 lines
12 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 <sys/signalvar.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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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) __attribute__ ((constructor));
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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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&_pthread_create
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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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extern int _thread_state_running;
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static int init_once = 0;
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/*
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* For the shared version of the threads library, the above is sufficient.
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* But for the archive version of the library, we need a little bit more.
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* Namely, we must arrange for this particular module to be pulled in from
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* the archive library at link time. To accomplish that, we define and
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* initialize a variable, "_thread_autoinit_dummy_decl". This variable is
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* referenced (as an extern) from libc/stdlib/exit.c. This will always
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* create a need for this module, ensuring that it is present in the
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* executable.
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*/
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extern int _thread_autoinit_dummy_decl;
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int _thread_autoinit_dummy_decl = 0;
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void
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_thread_init_hack(void)
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{
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_libpthread_init(NULL);
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}
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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, first = 0;
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sigset_t sigset, oldset;
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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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/* Pull debug symbols in for static binary */
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_thread_state_running = PS_RUNNING;
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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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/* Set the initial thread. */
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if (curthread == NULL) {
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first = 1;
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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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init_main_thread(curthread);
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}
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/*
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* Add the thread to the thread list queue.
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*/
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THR_LIST_ADD(curthread);
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_thread_active_threads = 1;
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/* Setup the thread specific data */
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_tcb_set(curthread->tcb);
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if (first) {
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SIGFILLSET(sigset);
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SIGDELSET(sigset, SIGTRAP);
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__sys_sigprocmask(SIG_SETMASK, &sigset, &oldset);
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_thr_signal_init();
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_thr_initial = curthread;
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SIGDELSET(oldset, SIGCANCEL);
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__sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
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}
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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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/* Setup the thread attributes. */
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thr_self(&thread->tid);
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thread->attr = _pthread_attr_default;
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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
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* are constrained to a maximum size by the parameters
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* passed to mmap(), but this stack is only limited by
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* resource limits, so this stack needs an explicitly mapped
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* red zone to protect the thread stack that is just beyond.
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*/
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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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/*
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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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*
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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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*/
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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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/*
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* Write a magic value to the thread structure
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* to help identify valid ones:
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*/
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thread->magic = THR_MAGIC;
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thread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED;
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thread->name = strdup("initial thread");
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/* Default the priority of the initial thread: */
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thread->base_priority = THR_DEFAULT_PRIORITY;
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thread->active_priority = THR_DEFAULT_PRIORITY;
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thread->inherited_priority = 0;
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/* Initialize the mutex queue: */
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TAILQ_INIT(&thread->mutexq);
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TAILQ_INIT(&thread->pri_mutexq);
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thread->state = PS_RUNNING;
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thread->uniqueid = 0;
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/* Others cleared to zero by thr_alloc() */
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}
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static void
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init_private(void)
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{
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size_t len;
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int mib[2];
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_thr_umtx_init(&_mutex_static_lock);
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_thr_umtx_init(&_cond_static_lock);
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_thr_umtx_init(&_rwlock_static_lock);
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_thr_umtx_init(&_keytable_lock);
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_thr_umtx_init(&_thr_atfork_lock);
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_thr_spinlock_init();
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_thr_list_init();
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/*
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* Avoid reinitializing some things if they don't need to be,
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* e.g. after a fork().
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*/
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if (init_once == 0) {
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/* Find the stack top */
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mib[0] = CTL_KERN;
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mib[1] = KERN_USRSTACK;
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len = sizeof (_usrstack);
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if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1)
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PANIC("Cannot get kern.usrstack from sysctl");
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_thr_page_size = getpagesize();
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_thr_guard_default = _thr_page_size;
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_pthread_attr_default.guardsize_attr = _thr_guard_default;
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_pthread_attr_default.stacksize_attr = _thr_stack_default;
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TAILQ_INIT(&_thr_atfork_list);
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#ifdef SYSTEM_SCOPE_ONLY
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_thr_scope_system = 1;
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#else
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if (getenv("LIBPTHREAD_SYSTEM_SCOPE") != NULL)
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_thr_scope_system = 1;
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else if (getenv("LIBPTHREAD_PROCESS_SCOPE") != NULL)
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_thr_scope_system = -1;
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#endif
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}
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init_once = 1;
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}
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