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/* $OpenBSD: uthread_init.c,v 1.35 2006/04/09 02:57:41 krw Exp $ */
/*
* 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: uthread_init.c,v 1.18 1999/08/28 00:03:36 peter Exp $
*/
/* Allocate space for global thread variables here: */
#define GLOBAL_PTHREAD_PRIVATE
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/ttycom.h>
#include <sys/user.h>
#include <sys/wait.h>
#include <dlfcn.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <poll.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef _THREAD_SAFE
#include <machine/reg.h>
#include <pthread.h>
#include "pthread_private.h"
/* Global thread variables. */
_stack_list_t _stackq;
extern int _thread_autoinit_dummy_decl;
/*
* All weak references used within libc that are redefined in libpthread
* MUST be in this table. This is necessary to force the proper version to
* be used when linking -static.
*/
static void *references[] = {
&_exit,
&accept,
&bind,
&close,
&closefrom,
&connect,
&dup,
&dup2,
&execve,
&fchflags,
&fchmod,
&fchown,
&fcntl,
&flock,
&fork,
&fpathconf,
&fstat,
&fstatfs,
&fsync,
&getdirentries,
&getpeername,
&getsockname,
&getsockopt,
&ioctl,
&kevent,
&kqueue,
&listen,
&msync,
&nanosleep,
&open,
&pipe,
&poll,
&read,
&readv,
&recvfrom,
&recvmsg,
&select,
&sendmsg,
&sendto,
&setsockopt,
&shutdown,
&sigaction,
&sigaltstack,
&sigpending,
&sigprocmask,
&sigsuspend,
&socket,
&socketpair,
&vfork,
&wait4,
&write,
&writev,
/* libc thread-safe helper functions */
&_thread_fd_lock,
&_thread_fd_unlock,
&_thread_malloc_init,
&_thread_malloc_lock,
&_thread_malloc_unlock,
&_thread_atexit_lock,
&_thread_atexit_unlock,
&_thread_tag_lock,
&_thread_tag_unlock,
&_thread_tag_storage,
&flockfile,
&ftrylockfile,
&funlockfile
};
/*
* Threaded process initialization
*/
void
_thread_init(void)
{
int fd;
int flags;
int res;
int i;
size_t len;
int mib[2];
struct clockinfo clockinfo;
struct sigaction act;
/* Check if this function has already been called: */
if (_thread_initial)
/* Only initialise the threaded application once. */
return;
if (references[0] == NULL)
PANIC("Failed loading mandatory references in _thread_init");
/*
* Check for the special case of this process running as
* or in place of init as pid = 1:
*/
if (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 = _thread_sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
PANIC("Can't open console");
if (setlogin("root") == -1)
PANIC("Can't set login to root");
if (_thread_sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1)
PANIC("Can't set controlling terminal");
if (_thread_sys_dup2(fd,0) == -1 ||
_thread_sys_dup2(fd,1) == -1 ||
_thread_sys_dup2(fd,2) == -1)
PANIC("Can't dup2");
}
/*
* Create a pipe that is written to by the signal handler to prevent
* signals being missed in calls to _select:
*/
if (_thread_sys_pipe(_thread_kern_pipe) != 0)
PANIC("Cannot create kernel pipe");
flags = _thread_sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL);
if (flags == -1)
PANIC("Cannot get kernel read pipe flags");
res = _thread_sys_fcntl(_thread_kern_pipe[0], F_SETFL,
flags | O_NONBLOCK);
if (res == -1)
PANIC("Cannot make kernel read pipe non-blocking");
flags = _thread_sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL);
if (flags == -1)
PANIC("Cannot get kernel write pipe flags");
res = _thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL,
flags | O_NONBLOCK);
if (res == -1)
PANIC("Cannot make kernel write pipe non-blocking");
res = _pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_LAST_PRIORITY);
if (res != 0)
PANIC("Cannot allocate priority ready queue.");
_thread_initial = (pthread_t) malloc(sizeof(struct pthread));
if (_thread_initial == NULL)
PANIC("Cannot allocate memory for initial thread");
/* Zero the global kernel thread structure: */
memset(&_thread_kern_thread, 0, sizeof(struct pthread));
_thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE;
memset(_thread_initial, 0, sizeof(struct pthread));
/* Initialize the waiting and work queues: */
TAILQ_INIT(&_waitingq);
TAILQ_INIT(&_workq);
/* Initialize the scheduling switch hook routine: */
_sched_switch_hook = NULL;
/* Initialize the thread stack cache: */
SLIST_INIT(&_stackq);
/*
* Write a magic value to the thread structure
* to help identify valid ones:
*/
_thread_initial->magic = PTHREAD_MAGIC;
/* Set the initial cancel state */
_thread_initial->cancelflags = PTHREAD_CANCEL_ENABLE |
PTHREAD_CANCEL_DEFERRED;
/* Default the priority of the initial thread: */
_thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY;
_thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY;
_thread_initial->inherited_priority = 0;
/* Initialise the state of the initial thread: */
_thread_initial->state = PS_RUNNING;
/* Initialize joiner to NULL (no joiner): */
_thread_initial->joiner = NULL;
/* Initialize the owned mutex queue and count: */
TAILQ_INIT(&(_thread_initial->mutexq));
_thread_initial->priority_mutex_count = 0;
/* Initialize the global scheduling time: */
_sched_ticks = 0;
gettimeofday((struct timeval *) &_sched_tod, NULL);
/* Initialize last active: */
_thread_initial->last_active = (long) _sched_ticks;
/* Give it a useful name */
pthread_set_name_np(_thread_initial, "main");
/* Initialise the rest of the fields: */
_thread_initial->poll_data.nfds = 0;
_thread_initial->poll_data.fds = NULL;
_thread_initial->sig_defer_count = 0;
_thread_initial->slice_usec = -1;
_thread_initial->sig_saved = 0;
_thread_initial->yield_on_sig_undefer = 0;
_thread_initial->specific_data = NULL;
_thread_initial->cleanup = NULL;
_thread_initial->flags = 0;
_thread_initial->error = 0;
_SPINLOCK_INIT(&_thread_initial->lock);
TAILQ_INIT(&_thread_list);
TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle);
_set_curthread(_thread_initial);
TAILQ_INIT(&_atfork_list);
pthread_mutex_init(&_atfork_mutex, NULL);
/* Initialise the global signal action structure: */
sigfillset(&act.sa_mask);
act.sa_handler = (void (*) (int)) _thread_sig_handler;
act.sa_flags = SA_SIGINFO;
/* Clear pending signals for the process: */
sigemptyset(&_process_sigpending);
/* Initialize signal handling: */
_thread_sig_init();
/* 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)
continue;
/* Get the signal handler details: */
if (_thread_sys_sigaction(i, NULL, &_thread_sigact[i - 1]) != 0)
PANIC("Cannot read signal handler info");
/* Initialize the SIG_DFL dummy handler count. */
_thread_dfl_count[i] = 0;
}
/*
* Install the signal handler for the most important
* signals that the user-thread kernel needs. Actually
* SIGINFO isn't really needed, but it is nice to have.
*/
if (_thread_sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 ||
_thread_sys_sigaction(SIGINFO, &act, NULL) != 0 ||
_thread_sys_sigaction(SIGCHLD, &act, NULL) != 0)
PANIC("Cannot initialize signal handler");
_thread_sigact[_SCHED_SIGNAL - 1].sa_flags = SA_SIGINFO;
_thread_sigact[SIGINFO - 1].sa_flags = SA_SIGINFO;
_thread_sigact[SIGCHLD - 1].sa_flags = SA_SIGINFO;
/* Get the process signal mask: */
_thread_sys_sigprocmask(SIG_SETMASK, NULL, &_process_sigmask);
/* 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 > CLOCK_RES_USEC_MIN ?
clockinfo.tick : CLOCK_RES_USEC_MIN;
/* Get the table size: */
if ((_thread_dtablesize = getdtablesize()) < 0)
PANIC("Cannot get dtablesize");
/* Allocate memory for the file descriptor table: */
_thread_fd_table = calloc(_thread_dtablesize,
sizeof(struct fd_table_entry *));
if (_thread_fd_table == NULL) {
_thread_dtablesize = 0;
PANIC("Cannot allocate memory for file descriptor table");
}
/* Allocate memory for the pollfd table: */
_thread_pfd_table = calloc(_thread_dtablesize, sizeof(struct pollfd));
if (_thread_pfd_table == NULL)
PANIC("Cannot allocate memory for pollfd table");
/* initialize the fd table */
_thread_fd_init();
/* Initialise the garbage collector mutex and condition variable. */
if (pthread_mutex_init(&_gc_mutex,NULL) != 0 ||
pthread_cond_init(&_gc_cond,NULL) != 0)
PANIC("Failed to initialise garbage collector mutex or cond");
#if defined(__ELF__)
/* Register with dlctl for thread safe dlopen */
dlctl(NULL, DL_SETTHREADLCK, _thread_kern_lock);
#endif
_thread_autoinit_dummy_decl = 0;
}
#endif
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