ada33a6e36
module private type, when private type mutex is locked/unlocked, thread critical region is entered or leaved. These changes makes fork() async-signal safe which required by POSIX. Note that user's atfork handler still needs to be async-signal safe, but it is not problem of libthr, it is user's responsiblity.
464 lines
16 KiB
C
464 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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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/signalvar.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <sys/ttycom.h>
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#include <sys/mman.h>
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#include <sys/rtprio.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 <stdlib.h>
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#include <string.h>
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#include <time.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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char *_usrstack;
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struct pthread *_thr_initial;
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int _libthr_debug;
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int _thread_event_mask;
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struct pthread *_thread_last_event;
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pthreadlist _thread_list = TAILQ_HEAD_INITIALIZER(_thread_list);
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pthreadlist _thread_gc_list = TAILQ_HEAD_INITIALIZER(_thread_gc_list);
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int _thread_active_threads = 1;
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atfork_head _thr_atfork_list = TAILQ_HEAD_INITIALIZER(_thr_atfork_list);
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struct urwlock _thr_atfork_lock = DEFAULT_URWLOCK;
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struct pthread_prio _thr_priorities[3] = {
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{RTP_PRIO_MIN, RTP_PRIO_MAX, 0}, /* FIFO */
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{0, 0, 63}, /* OTHER */
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{RTP_PRIO_MIN, RTP_PRIO_MAX, 0} /* RR */
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};
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struct pthread_attr _pthread_attr_default = {
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.sched_policy = SCHED_OTHER,
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.sched_inherit = PTHREAD_INHERIT_SCHED,
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.prio = 0,
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.suspend = THR_CREATE_RUNNING,
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.flags = PTHREAD_SCOPE_SYSTEM,
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.stackaddr_attr = NULL,
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.stacksize_attr = THR_STACK_DEFAULT,
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.guardsize_attr = 0,
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.cpusetsize = 0,
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.cpuset = NULL
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};
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struct pthread_mutex_attr _pthread_mutexattr_default = {
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.m_type = PTHREAD_MUTEX_DEFAULT,
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.m_protocol = PTHREAD_PRIO_NONE,
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.m_ceiling = 0
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};
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/* Default condition variable attributes: */
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struct pthread_cond_attr _pthread_condattr_default = {
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.c_pshared = PTHREAD_PROCESS_PRIVATE,
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.c_clockid = CLOCK_REALTIME
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};
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pid_t _thr_pid;
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int _thr_is_smp = 0;
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size_t _thr_guard_default;
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size_t _thr_stack_default = THR_STACK_DEFAULT;
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size_t _thr_stack_initial = THR_STACK_INITIAL;
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int _thr_page_size;
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int _thr_spinloops;
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int _thr_yieldloops;
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int _gc_count;
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struct umutex _mutex_static_lock = DEFAULT_UMUTEX;
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struct umutex _cond_static_lock = DEFAULT_UMUTEX;
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struct umutex _rwlock_static_lock = DEFAULT_UMUTEX;
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struct umutex _keytable_lock = DEFAULT_UMUTEX;
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struct umutex _thr_list_lock = DEFAULT_UMUTEX;
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struct umutex _thr_event_lock = DEFAULT_UMUTEX;
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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_LIB_REQUIRE(_fork);
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STATIC_LIB_REQUIRE(_pthread_getspecific);
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STATIC_LIB_REQUIRE(_pthread_key_create);
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STATIC_LIB_REQUIRE(_pthread_key_delete);
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STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
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STATIC_LIB_REQUIRE(_pthread_mutex_init);
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STATIC_LIB_REQUIRE(_pthread_mutex_lock);
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STATIC_LIB_REQUIRE(_pthread_mutex_trylock);
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STATIC_LIB_REQUIRE(_pthread_mutex_unlock);
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STATIC_LIB_REQUIRE(_pthread_mutexattr_init);
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STATIC_LIB_REQUIRE(_pthread_mutexattr_destroy);
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STATIC_LIB_REQUIRE(_pthread_mutexattr_settype);
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STATIC_LIB_REQUIRE(_pthread_once);
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STATIC_LIB_REQUIRE(_pthread_setspecific);
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STATIC_LIB_REQUIRE(_raise);
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STATIC_LIB_REQUIRE(_sem_destroy);
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STATIC_LIB_REQUIRE(_sem_getvalue);
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STATIC_LIB_REQUIRE(_sem_init);
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STATIC_LIB_REQUIRE(_sem_post);
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STATIC_LIB_REQUIRE(_sem_timedwait);
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STATIC_LIB_REQUIRE(_sem_trywait);
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STATIC_LIB_REQUIRE(_sem_wait);
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STATIC_LIB_REQUIRE(_sigaction);
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STATIC_LIB_REQUIRE(_sigprocmask);
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STATIC_LIB_REQUIRE(_sigsuspend);
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STATIC_LIB_REQUIRE(_sigtimedwait);
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STATIC_LIB_REQUIRE(_sigwait);
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STATIC_LIB_REQUIRE(_sigwaitinfo);
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STATIC_LIB_REQUIRE(_spinlock);
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STATIC_LIB_REQUIRE(_spinlock_debug);
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STATIC_LIB_REQUIRE(_spinunlock);
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STATIC_LIB_REQUIRE(_thread_init_hack);
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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_LIB_REQUIRE(_pthread_once);
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STATIC_LIB_REQUIRE(_pthread_key_create);
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STATIC_LIB_REQUIRE(_pthread_key_delete);
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STATIC_LIB_REQUIRE(_pthread_getspecific);
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STATIC_LIB_REQUIRE(_pthread_setspecific);
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STATIC_LIB_REQUIRE(_pthread_mutex_init);
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STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
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STATIC_LIB_REQUIRE(_pthread_mutex_lock);
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STATIC_LIB_REQUIRE(_pthread_mutex_trylock);
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STATIC_LIB_REQUIRE(_pthread_mutex_unlock);
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STATIC_LIB_REQUIRE(_pthread_create);
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/* Pull in all symbols required by libthread_db */
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STATIC_LIB_REQUIRE(_thread_state_running);
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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_atfork)}, /* PJT_ATFORK */
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{DUAL_ENTRY(_pthread_attr_destroy)}, /* PJT_ATTR_DESTROY */
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{DUAL_ENTRY(_pthread_attr_getdetachstate)}, /* PJT_ATTR_GETDETACHSTATE */
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{DUAL_ENTRY(_pthread_attr_getguardsize)}, /* PJT_ATTR_GETGUARDSIZE */
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{DUAL_ENTRY(_pthread_attr_getinheritsched)}, /* PJT_ATTR_GETINHERITSCHED */
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{DUAL_ENTRY(_pthread_attr_getschedparam)}, /* PJT_ATTR_GETSCHEDPARAM */
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{DUAL_ENTRY(_pthread_attr_getschedpolicy)}, /* PJT_ATTR_GETSCHEDPOLICY */
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{DUAL_ENTRY(_pthread_attr_getscope)}, /* PJT_ATTR_GETSCOPE */
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{DUAL_ENTRY(_pthread_attr_getstackaddr)}, /* PJT_ATTR_GETSTACKADDR */
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{DUAL_ENTRY(_pthread_attr_getstacksize)}, /* PJT_ATTR_GETSTACKSIZE */
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{DUAL_ENTRY(_pthread_attr_init)}, /* PJT_ATTR_INIT */
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{DUAL_ENTRY(_pthread_attr_setdetachstate)}, /* PJT_ATTR_SETDETACHSTATE */
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{DUAL_ENTRY(_pthread_attr_setguardsize)}, /* PJT_ATTR_SETGUARDSIZE */
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{DUAL_ENTRY(_pthread_attr_setinheritsched)}, /* PJT_ATTR_SETINHERITSCHED */
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{DUAL_ENTRY(_pthread_attr_setschedparam)}, /* PJT_ATTR_SETSCHEDPARAM */
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{DUAL_ENTRY(_pthread_attr_setschedpolicy)}, /* PJT_ATTR_SETSCHEDPOLICY */
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{DUAL_ENTRY(_pthread_attr_setscope)}, /* PJT_ATTR_SETSCOPE */
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{DUAL_ENTRY(_pthread_attr_setstackaddr)}, /* PJT_ATTR_SETSTACKADDR */
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{DUAL_ENTRY(_pthread_attr_setstacksize)}, /* PJT_ATTR_SETSTACKSIZE */
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{DUAL_ENTRY(_pthread_cancel)}, /* PJT_CANCEL */
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{DUAL_ENTRY(_pthread_cleanup_pop)}, /* PJT_CLEANUP_POP */
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{DUAL_ENTRY(_pthread_cleanup_push)}, /* PJT_CLEANUP_PUSH */
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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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{DUAL_ENTRY(_pthread_cond_timedwait)}, /* PJT_COND_TIMEDWAIT */
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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_detach)}, /* PJT_DETACH */
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{DUAL_ENTRY(_pthread_equal)}, /* PJT_EQUAL */
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{DUAL_ENTRY(_pthread_exit)}, /* PJT_EXIT */
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{DUAL_ENTRY(_pthread_getspecific)}, /* PJT_GETSPECIFIC */
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{DUAL_ENTRY(_pthread_join)}, /* PJT_JOIN */
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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_kill)}, /* PJT_KILL */
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{DUAL_ENTRY(_pthread_main_np)}, /* PJT_MAIN_NP */
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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_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_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_setcancelstate)}, /* PJT_SETCANCELSTATE */
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{DUAL_ENTRY(_pthread_setcanceltype)}, /* PJT_SETCANCELTYPE */
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{DUAL_ENTRY(_pthread_setspecific)}, /* PJT_SETSPECIFIC */
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{DUAL_ENTRY(_pthread_sigmask)}, /* PJT_SIGMASK */
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{DUAL_ENTRY(_pthread_testcancel)}, /* PJT_TESTCANCEL */
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{DUAL_ENTRY(__pthread_cleanup_pop_imp)},/* PJT_CLEANUP_POP_IMP */
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{DUAL_ENTRY(__pthread_cleanup_push_imp)}/* PJT_CLEANUP_PUSH_IMP */
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};
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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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/* 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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* 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 (_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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_thr_initial = curthread;
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_thr_signal_init();
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if (_thread_event_mask & TD_CREATE)
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_thr_report_creation(curthread, curthread);
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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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struct sched_param sched_param;
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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(_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 = _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->cancel_enable = 1;
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thread->cancel_async = 0;
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thr_set_name(thread->tid, "initial thread");
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/* Initialize the mutex queue: */
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TAILQ_INIT(&thread->mutexq);
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TAILQ_INIT(&thread->pp_mutexq);
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thread->state = PS_RUNNING;
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_thr_getscheduler(thread->tid, &thread->attr.sched_policy,
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|
&sched_param);
|
|
thread->attr.prio = sched_param.sched_priority;
|
|
|
|
/* Others cleared to zero by thr_alloc() */
|
|
}
|
|
|
|
static void
|
|
init_private(void)
|
|
{
|
|
size_t len;
|
|
int mib[2];
|
|
char *env;
|
|
|
|
_thr_umutex_init(&_mutex_static_lock);
|
|
_thr_umutex_init(&_cond_static_lock);
|
|
_thr_umutex_init(&_rwlock_static_lock);
|
|
_thr_umutex_init(&_keytable_lock);
|
|
_thr_urwlock_init(&_thr_atfork_lock);
|
|
_thr_umutex_init(&_thr_event_lock);
|
|
_thr_once_init();
|
|
_thr_spinlock_init();
|
|
_thr_list_init();
|
|
|
|
/*
|
|
* 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");
|
|
len = sizeof(_thr_is_smp);
|
|
sysctlbyname("kern.smp.cpus", &_thr_is_smp, &len, NULL, 0);
|
|
_thr_is_smp = (_thr_is_smp > 1);
|
|
_thr_page_size = getpagesize();
|
|
_thr_guard_default = _thr_page_size;
|
|
_pthread_attr_default.guardsize_attr = _thr_guard_default;
|
|
_pthread_attr_default.stacksize_attr = _thr_stack_default;
|
|
env = getenv("LIBPTHREAD_SPINLOOPS");
|
|
if (env)
|
|
_thr_spinloops = atoi(env);
|
|
env = getenv("LIBPTHREAD_YIELDLOOPS");
|
|
if (env)
|
|
_thr_yieldloops = atoi(env);
|
|
TAILQ_INIT(&_thr_atfork_list);
|
|
}
|
|
init_once = 1;
|
|
}
|