| Current Path : /usr/src/lib/libthr/thread/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/lib/libthr/thread/thr_init.c |
/*
* Copyright (c) 2003 Daniel M. Eischen <deischen@freebsd.org>
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: release/9.1.0/lib/libthr/thread/thr_init.c 223294 2011-06-19 13:35:36Z kan $
*/
#include "namespace.h"
#include <sys/types.h>
#include <sys/signalvar.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <sys/ttycom.h>
#include <sys/mman.h>
#include <sys/rtprio.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <pthread.h>
#include <pthread_np.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "thr_private.h"
char *_usrstack;
struct pthread *_thr_initial;
int _libthr_debug;
int _thread_event_mask;
struct pthread *_thread_last_event;
pthreadlist _thread_list = TAILQ_HEAD_INITIALIZER(_thread_list);
pthreadlist _thread_gc_list = TAILQ_HEAD_INITIALIZER(_thread_gc_list);
int _thread_active_threads = 1;
atfork_head _thr_atfork_list = TAILQ_HEAD_INITIALIZER(_thr_atfork_list);
struct urwlock _thr_atfork_lock = DEFAULT_URWLOCK;
struct pthread_prio _thr_priorities[3] = {
{RTP_PRIO_MIN, RTP_PRIO_MAX, 0}, /* FIFO */
{0, 0, 63}, /* OTHER */
{RTP_PRIO_MIN, RTP_PRIO_MAX, 0} /* RR */
};
struct pthread_attr _pthread_attr_default = {
.sched_policy = SCHED_OTHER,
.sched_inherit = PTHREAD_INHERIT_SCHED,
.prio = 0,
.suspend = THR_CREATE_RUNNING,
.flags = PTHREAD_SCOPE_SYSTEM,
.stackaddr_attr = NULL,
.stacksize_attr = THR_STACK_DEFAULT,
.guardsize_attr = 0,
.cpusetsize = 0,
.cpuset = NULL
};
struct pthread_mutex_attr _pthread_mutexattr_default = {
.m_type = PTHREAD_MUTEX_DEFAULT,
.m_protocol = PTHREAD_PRIO_NONE,
.m_ceiling = 0
};
struct pthread_mutex_attr _pthread_mutexattr_adaptive_default = {
.m_type = PTHREAD_MUTEX_ADAPTIVE_NP,
.m_protocol = PTHREAD_PRIO_NONE,
.m_ceiling = 0
};
/* Default condition variable attributes: */
struct pthread_cond_attr _pthread_condattr_default = {
.c_pshared = PTHREAD_PROCESS_PRIVATE,
.c_clockid = CLOCK_REALTIME
};
pid_t _thr_pid;
int _thr_is_smp = 0;
size_t _thr_guard_default;
size_t _thr_stack_default = THR_STACK_DEFAULT;
size_t _thr_stack_initial = THR_STACK_INITIAL;
int _thr_page_size;
int _thr_spinloops;
int _thr_yieldloops;
int _gc_count;
struct umutex _mutex_static_lock = DEFAULT_UMUTEX;
struct umutex _cond_static_lock = DEFAULT_UMUTEX;
struct umutex _rwlock_static_lock = DEFAULT_UMUTEX;
struct umutex _keytable_lock = DEFAULT_UMUTEX;
struct urwlock _thr_list_lock = DEFAULT_URWLOCK;
struct umutex _thr_event_lock = DEFAULT_UMUTEX;
int __pthread_cond_wait(pthread_cond_t *, pthread_mutex_t *);
int __pthread_mutex_lock(pthread_mutex_t *);
int __pthread_mutex_trylock(pthread_mutex_t *);
void _thread_init_hack(void) __attribute__ ((constructor));
static void init_private(void);
static void init_main_thread(struct pthread *thread);
/*
* All weak references used within libc should be in this table.
* This is so that static libraries will work.
*/
STATIC_LIB_REQUIRE(_fork);
STATIC_LIB_REQUIRE(_pthread_getspecific);
STATIC_LIB_REQUIRE(_pthread_key_create);
STATIC_LIB_REQUIRE(_pthread_key_delete);
STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
STATIC_LIB_REQUIRE(_pthread_mutex_init);
STATIC_LIB_REQUIRE(_pthread_mutex_lock);
STATIC_LIB_REQUIRE(_pthread_mutex_trylock);
STATIC_LIB_REQUIRE(_pthread_mutex_unlock);
STATIC_LIB_REQUIRE(_pthread_mutexattr_init);
STATIC_LIB_REQUIRE(_pthread_mutexattr_destroy);
STATIC_LIB_REQUIRE(_pthread_mutexattr_settype);
STATIC_LIB_REQUIRE(_pthread_once);
STATIC_LIB_REQUIRE(_pthread_setspecific);
STATIC_LIB_REQUIRE(_raise);
STATIC_LIB_REQUIRE(_sem_destroy);
STATIC_LIB_REQUIRE(_sem_getvalue);
STATIC_LIB_REQUIRE(_sem_init);
STATIC_LIB_REQUIRE(_sem_post);
STATIC_LIB_REQUIRE(_sem_timedwait);
STATIC_LIB_REQUIRE(_sem_trywait);
STATIC_LIB_REQUIRE(_sem_wait);
STATIC_LIB_REQUIRE(_sigaction);
STATIC_LIB_REQUIRE(_sigprocmask);
STATIC_LIB_REQUIRE(_sigsuspend);
STATIC_LIB_REQUIRE(_sigtimedwait);
STATIC_LIB_REQUIRE(_sigwait);
STATIC_LIB_REQUIRE(_sigwaitinfo);
STATIC_LIB_REQUIRE(_spinlock);
STATIC_LIB_REQUIRE(_spinlock_debug);
STATIC_LIB_REQUIRE(_spinunlock);
STATIC_LIB_REQUIRE(_thread_init_hack);
/*
* These are needed when linking statically. All references within
* libgcc (and in the future libc) to these routines are weak, but
* if they are not (strongly) referenced by the application or other
* libraries, then the actual functions will not be loaded.
*/
STATIC_LIB_REQUIRE(_pthread_once);
STATIC_LIB_REQUIRE(_pthread_key_create);
STATIC_LIB_REQUIRE(_pthread_key_delete);
STATIC_LIB_REQUIRE(_pthread_getspecific);
STATIC_LIB_REQUIRE(_pthread_setspecific);
STATIC_LIB_REQUIRE(_pthread_mutex_init);
STATIC_LIB_REQUIRE(_pthread_mutex_destroy);
STATIC_LIB_REQUIRE(_pthread_mutex_lock);
STATIC_LIB_REQUIRE(_pthread_mutex_trylock);
STATIC_LIB_REQUIRE(_pthread_mutex_unlock);
STATIC_LIB_REQUIRE(_pthread_create);
/* Pull in all symbols required by libthread_db */
STATIC_LIB_REQUIRE(_thread_state_running);
#define DUAL_ENTRY(entry) \
(pthread_func_t)entry, (pthread_func_t)entry
static pthread_func_t jmp_table[][2] = {
{DUAL_ENTRY(_pthread_atfork)}, /* PJT_ATFORK */
{DUAL_ENTRY(_pthread_attr_destroy)}, /* PJT_ATTR_DESTROY */
{DUAL_ENTRY(_pthread_attr_getdetachstate)}, /* PJT_ATTR_GETDETACHSTATE */
{DUAL_ENTRY(_pthread_attr_getguardsize)}, /* PJT_ATTR_GETGUARDSIZE */
{DUAL_ENTRY(_pthread_attr_getinheritsched)}, /* PJT_ATTR_GETINHERITSCHED */
{DUAL_ENTRY(_pthread_attr_getschedparam)}, /* PJT_ATTR_GETSCHEDPARAM */
{DUAL_ENTRY(_pthread_attr_getschedpolicy)}, /* PJT_ATTR_GETSCHEDPOLICY */
{DUAL_ENTRY(_pthread_attr_getscope)}, /* PJT_ATTR_GETSCOPE */
{DUAL_ENTRY(_pthread_attr_getstackaddr)}, /* PJT_ATTR_GETSTACKADDR */
{DUAL_ENTRY(_pthread_attr_getstacksize)}, /* PJT_ATTR_GETSTACKSIZE */
{DUAL_ENTRY(_pthread_attr_init)}, /* PJT_ATTR_INIT */
{DUAL_ENTRY(_pthread_attr_setdetachstate)}, /* PJT_ATTR_SETDETACHSTATE */
{DUAL_ENTRY(_pthread_attr_setguardsize)}, /* PJT_ATTR_SETGUARDSIZE */
{DUAL_ENTRY(_pthread_attr_setinheritsched)}, /* PJT_ATTR_SETINHERITSCHED */
{DUAL_ENTRY(_pthread_attr_setschedparam)}, /* PJT_ATTR_SETSCHEDPARAM */
{DUAL_ENTRY(_pthread_attr_setschedpolicy)}, /* PJT_ATTR_SETSCHEDPOLICY */
{DUAL_ENTRY(_pthread_attr_setscope)}, /* PJT_ATTR_SETSCOPE */
{DUAL_ENTRY(_pthread_attr_setstackaddr)}, /* PJT_ATTR_SETSTACKADDR */
{DUAL_ENTRY(_pthread_attr_setstacksize)}, /* PJT_ATTR_SETSTACKSIZE */
{DUAL_ENTRY(_pthread_cancel)}, /* PJT_CANCEL */
{DUAL_ENTRY(_pthread_cleanup_pop)}, /* PJT_CLEANUP_POP */
{DUAL_ENTRY(_pthread_cleanup_push)}, /* PJT_CLEANUP_PUSH */
{DUAL_ENTRY(_pthread_cond_broadcast)}, /* PJT_COND_BROADCAST */
{DUAL_ENTRY(_pthread_cond_destroy)}, /* PJT_COND_DESTROY */
{DUAL_ENTRY(_pthread_cond_init)}, /* PJT_COND_INIT */
{DUAL_ENTRY(_pthread_cond_signal)}, /* PJT_COND_SIGNAL */
{DUAL_ENTRY(_pthread_cond_timedwait)}, /* PJT_COND_TIMEDWAIT */
{(pthread_func_t)__pthread_cond_wait,
(pthread_func_t)_pthread_cond_wait}, /* PJT_COND_WAIT */
{DUAL_ENTRY(_pthread_detach)}, /* PJT_DETACH */
{DUAL_ENTRY(_pthread_equal)}, /* PJT_EQUAL */
{DUAL_ENTRY(_pthread_exit)}, /* PJT_EXIT */
{DUAL_ENTRY(_pthread_getspecific)}, /* PJT_GETSPECIFIC */
{DUAL_ENTRY(_pthread_join)}, /* PJT_JOIN */
{DUAL_ENTRY(_pthread_key_create)}, /* PJT_KEY_CREATE */
{DUAL_ENTRY(_pthread_key_delete)}, /* PJT_KEY_DELETE*/
{DUAL_ENTRY(_pthread_kill)}, /* PJT_KILL */
{DUAL_ENTRY(_pthread_main_np)}, /* PJT_MAIN_NP */
{DUAL_ENTRY(_pthread_mutexattr_destroy)}, /* PJT_MUTEXATTR_DESTROY */
{DUAL_ENTRY(_pthread_mutexattr_init)}, /* PJT_MUTEXATTR_INIT */
{DUAL_ENTRY(_pthread_mutexattr_settype)}, /* PJT_MUTEXATTR_SETTYPE */
{DUAL_ENTRY(_pthread_mutex_destroy)}, /* PJT_MUTEX_DESTROY */
{DUAL_ENTRY(_pthread_mutex_init)}, /* PJT_MUTEX_INIT */
{(pthread_func_t)__pthread_mutex_lock,
(pthread_func_t)_pthread_mutex_lock}, /* PJT_MUTEX_LOCK */
{(pthread_func_t)__pthread_mutex_trylock,
(pthread_func_t)_pthread_mutex_trylock},/* PJT_MUTEX_TRYLOCK */
{DUAL_ENTRY(_pthread_mutex_unlock)}, /* PJT_MUTEX_UNLOCK */
{DUAL_ENTRY(_pthread_once)}, /* PJT_ONCE */
{DUAL_ENTRY(_pthread_rwlock_destroy)}, /* PJT_RWLOCK_DESTROY */
{DUAL_ENTRY(_pthread_rwlock_init)}, /* PJT_RWLOCK_INIT */
{DUAL_ENTRY(_pthread_rwlock_rdlock)}, /* PJT_RWLOCK_RDLOCK */
{DUAL_ENTRY(_pthread_rwlock_tryrdlock)},/* PJT_RWLOCK_TRYRDLOCK */
{DUAL_ENTRY(_pthread_rwlock_trywrlock)},/* PJT_RWLOCK_TRYWRLOCK */
{DUAL_ENTRY(_pthread_rwlock_unlock)}, /* PJT_RWLOCK_UNLOCK */
{DUAL_ENTRY(_pthread_rwlock_wrlock)}, /* PJT_RWLOCK_WRLOCK */
{DUAL_ENTRY(_pthread_self)}, /* PJT_SELF */
{DUAL_ENTRY(_pthread_setcancelstate)}, /* PJT_SETCANCELSTATE */
{DUAL_ENTRY(_pthread_setcanceltype)}, /* PJT_SETCANCELTYPE */
{DUAL_ENTRY(_pthread_setspecific)}, /* PJT_SETSPECIFIC */
{DUAL_ENTRY(_pthread_sigmask)}, /* PJT_SIGMASK */
{DUAL_ENTRY(_pthread_testcancel)}, /* PJT_TESTCANCEL */
{DUAL_ENTRY(__pthread_cleanup_pop_imp)},/* PJT_CLEANUP_POP_IMP */
{DUAL_ENTRY(__pthread_cleanup_push_imp)},/* PJT_CLEANUP_PUSH_IMP */
{DUAL_ENTRY(_pthread_cancel_enter)}, /* PJT_CANCEL_ENTER */
{DUAL_ENTRY(_pthread_cancel_leave)} /* PJT_CANCEL_LEAVE */
};
static int init_once = 0;
/*
* For the shared version of the threads library, the above is sufficient.
* But for the archive version of the library, we need a little bit more.
* Namely, we must arrange for this particular module to be pulled in from
* the archive library at link time. To accomplish that, we define and
* initialize a variable, "_thread_autoinit_dummy_decl". This variable is
* referenced (as an extern) from libc/stdlib/exit.c. This will always
* create a need for this module, ensuring that it is present in the
* executable.
*/
extern int _thread_autoinit_dummy_decl;
int _thread_autoinit_dummy_decl = 0;
void
_thread_init_hack(void)
{
_libpthread_init(NULL);
}
/*
* Threaded process initialization.
*
* This is only called under two conditions:
*
* 1) Some thread routines have detected that the library hasn't yet
* been initialized (_thr_initial == NULL && curthread == NULL), or
*
* 2) An explicit call to reinitialize after a fork (indicated
* by curthread != NULL)
*/
void
_libpthread_init(struct pthread *curthread)
{
int fd, first = 0;
/* Check if this function has already been called: */
if ((_thr_initial != NULL) && (curthread == NULL))
/* Only initialize the threaded application once. */
return;
/*
* Check the size of the jump table to make sure it is preset
* with the correct number of entries.
*/
if (sizeof(jmp_table) != (sizeof(pthread_func_t) * PJT_MAX * 2))
PANIC("Thread jump table not properly initialized");
memcpy(__thr_jtable, jmp_table, sizeof(jmp_table));
/*
* Check for the special case of this process running as
* or in place of init as pid = 1:
*/
if ((_thr_pid = getpid()) == 1) {
/*
* Setup a new session for this process which is
* assumed to be running as root.
*/
if (setsid() == -1)
PANIC("Can't set session ID");
if (revoke(_PATH_CONSOLE) != 0)
PANIC("Can't revoke console");
if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
PANIC("Can't open console");
if (setlogin("root") == -1)
PANIC("Can't set login to root");
if (_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1)
PANIC("Can't set controlling terminal");
}
/* Initialize pthread private data. */
init_private();
/* Set the initial thread. */
if (curthread == NULL) {
first = 1;
/* Create and initialize the initial thread. */
curthread = _thr_alloc(NULL);
if (curthread == NULL)
PANIC("Can't allocate initial thread");
init_main_thread(curthread);
}
/*
* Add the thread to the thread list queue.
*/
THR_LIST_ADD(curthread);
_thread_active_threads = 1;
/* Setup the thread specific data */
_tcb_set(curthread->tcb);
if (first) {
_thr_initial = curthread;
_thr_signal_init();
if (_thread_event_mask & TD_CREATE)
_thr_report_creation(curthread, curthread);
}
}
/*
* This function and pthread_create() do a lot of the same things.
* It'd be nice to consolidate the common stuff in one place.
*/
static void
init_main_thread(struct pthread *thread)
{
struct sched_param sched_param;
/* Setup the thread attributes. */
thr_self(&thread->tid);
thread->attr = _pthread_attr_default;
/*
* Set up the thread stack.
*
* 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(_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");
/*
* Mark the stack as an application supplied stack so that it
* isn't deallocated.
*
* XXX - I'm not sure it would hurt anything to deallocate
* the main thread stack because deallocation doesn't
* actually free() it; it just puts it in the free
* stack queue for later reuse.
*/
thread->attr.stackaddr_attr = _usrstack - _thr_stack_initial;
thread->attr.stacksize_attr = _thr_stack_initial;
thread->attr.guardsize_attr = _thr_guard_default;
thread->attr.flags |= THR_STACK_USER;
/*
* Write a magic value to the thread structure
* to help identify valid ones:
*/
thread->magic = THR_MAGIC;
thread->cancel_enable = 1;
thread->cancel_async = 0;
/* Initialize the mutex queue: */
TAILQ_INIT(&thread->mutexq);
TAILQ_INIT(&thread->pp_mutexq);
thread->state = PS_RUNNING;
_thr_getscheduler(thread->tid, &thread->attr.sched_policy,
&sched_param);
thread->attr.prio = sched_param.sched_priority;
#ifdef _PTHREAD_FORCED_UNWIND
thread->unwind_stackend = _usrstack;
#endif
/* 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();
_thr_wake_addr_init();
_sleepq_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;
}